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Molybdenum disulfide powder down carbon analysis
1. Preface Gold [http://www.ktzmy-us.com/Pro-501.html molybdenum] technology limited liability company produces molybdenum disulfide (Mos2) powder is one of this company's main products, the products with the high quality, stable performance, and is exported to Europe and the United States. molybdenum disulfide (Mos2) powder production process is stable, product quality is good and is in line with PMD22 specifications. After April 2004, they manufactured specifications PMD22 under the original production process conditions. molybdenum disulfide (Mos2) powder appears quality problems, the main ingredient. molybdenum disulfide (Mos2) content is 98.19% ~ 98.49% and is less than 98.50% which results in export problem and can not meet the contract requirements. In response, Gold and molybdenum technology companies proceed through analysis from raw materials, auxiliary materials, processes, equipment, operations and other relevant factors, through analysis, testing, to determine the impact. molybdenum disulfide (Mos2) product quality's major factor is caused by its 57# molybdenum concentrates raw materials contains too high carbon (April 2004 57 # molybdenum concentrates production's carbon is up at least 0.6 percentage points than production of 2003 ). For this situation, the company decided to start from the ore, beneficiation process to proceed to identify the occurrence of carbon, sources, distribution, enrichment and other laws. 2.On-site reconnaissance and sampling Jinduicheng molybdenum mining is a decades-old mines, ore deposit types are simple, mainly two major types of minerals, igneous andesitic porphyry and granite porphyry and also with a small amount of slate and quartzite deposition. Stable nature of the ore, ore deposits in the previous years, the information recorded in the material composition, calcite as secondary minerals, mostly in the form of veins, no other carbon-phase record. For recent periods, the problem of increased carbon content of molybdenum, geological and technical personnel first conduct a geological reconnaissance, to understand the nature of the ore stope. Now the mining stones are located in the middle of ore bodies. Ore supply is mainly in 1056,1068,1080,1092 mine flat, minerals are andesitic porphyry and granite porphyry. The northeast corner of ore in the mine are exposed outside the boundaries of 5 ~ 10 m of gray, black slate. Reconnaissance process, andesitic porphyry ore in small flakes of biotite more common in the mining areas near the middle of fourteen sections andesitic porphyry in the black mud sandwich. In addition, as more mine construction and development, soft gray, clay gouge and scratches the surface of the mine with black block more common. Especially near the fault zone in the northeast corner of mine saw a carbonate veins, tilting the surface layer of black soil, sewage hand, substances such as carbon. After a reconnaissance of the different types of minerals and substances suspected of containing carbon samples from the mine blocks are different degrees of analysis. Substances, taking into account the carbon content is generally more common in sedimentary rocks, so outside the boundaries of the ore body is also black slate analysis of samples taken. The analysis of the nature of the sample product location shown in Table 1, Table 2, Table 3. Different types of ore carbon content analysis 3.1 Of the stope are mainly exposed granite porphyry and andesite porphyry ore chose a different location of the drilling samples in the different systems of the belt manufacturers have taken on ore samples were mixed carbon content analysis and comparison, and in order case study in the past carbon ore, beneficiation test sample of 2002 sub-sample (No. 200206) is also carried out the carbon analysis. 3.2 The carbon content analysis of special samples Field reconnaissance in the mining process, the fault gouge, and black scratches the surface of the ore block, veins, etc., take a special samples for chemical analysis. The results can be seen, in addition to the carbon content of carbonate veins up 10.61%, other hand-picked small samples of low carbon content of up to only 0.63%. Description ore, in addition to the higher carbon content, carbonate veins outside, not the higher carbon content and other special laminated rock ore blocks. Mainly calcite in the carbonate ore beneficiation process will not be enriched with the molybdenite. Inspection and analysis of mineral processing 4.1 Mineral processing inspection Of the dressing process may lead to increased carbon content in every aspect, such as ball mill liners, balls, flotation machines blade, processing agents and so the layers of analysis, inspection, and ultimately to the ball mill is used as the focus of analysis objects. Selected molybdenum plant in the selection process, a total of four grinding system, 4 ball. In the December 26, 2003 before the four ball is the use of low alloy white cast iron balls. After December 26, 2 #, 3 #, 2 ball started Repair factory production of ductile iron ball. January 26, 2004 in the factory after another 2 mill began using Repair factory supply of ductile iron ball. The end of February 2004 to early March, the plant has 2 ball added 2 months ductile iron ball, 2 ball mill by adding a month of ductile iron ball. The efficiency of mill's table at 85t / h, operation rate by 0.92%, the ball wear by 0.7kg / t (ore), per (80t) 1 / 2 after 2 months in the ball mill for more than 98% of ductile iron ball. That is in the ball mill plant in January 2004 from the beginning and gradually replaced by a cast iron ball low alloy white cast iron ball, to early April 2004, the plant ball mill have all been added by a ductile cast iron ball. This gold-molybdenum technology companies from early 2004 with production plants in 57 # molybdenum processing molybdenum disulfide (Mos2) product quality decreased and to May failed, the time in good agreement. 4.2 Analysis of the carbon content of different systems Election plant in the production process, different systems use different types of balls. 1 # 2 # system with ductile iron grinding ball; 3 # system with a low alloy white cast iron grinding balls. These three systems of molybdenum concentrates were sampling and analysis. 3 # molybdenum concentrates average carbon content of 0.54%, 1 #, 2 # molybdenum concentrates flat carbon content is above1.1% 0.6% higher more than 3# molybdenum concentrates. This is normal than failure of molybdenum disulfide (Mos2) powder. molybdenum disulfide (Mos2) powder of carbon higher than 0.6 percentage match, fully illustrated 57 # carbon content of molybdenum increased with additional cast iron ball has a certain relationship. 5. Balls of different types of raw materials and chemical analysis (1) Ductile iron ball of raw materials are 100% pig iron. Ductile iron ball in the beneficiation process of the unit consumption of 0.639 kg / t ore, broken rate is less than 1%. Ductile cast iron ball abundant supply of raw materials, convenient and low cost; carbon content of the finished cast iron ball is 3.5% to 3.8% carbon content which is 1.4 percentage points higher than the low alloy steel balls 2.1% to 2.4% carbon content. Ductile iron ball unit consumption is small, broken rate is low. (2) Raw materials of low-alloy steel ball is 40% of pig iron, 60% scrap. Low alloy white cast iron balls in the beneficiation process unit consumption of 0.727 kg / t ore, crushing rate is more than 2%. Raw materials requirement of low-alloy steel ball is higher, and higher cost. (3) chemical composition: finished cast iron ball and the chemical composition of low-alloy steel balls. 6. Conclusion (1) Production of 57 # molybdenum concentrate ore high carbon content did not rise.(2) Mineral processing of 57 # molybdenum concentrate production, mineral processing drugs has not changed.(3) The production process only change the ball mill, the plant adjust the types of ball mill's steel ball mill timely, with the gradual adjustment of the ball type, the carbon content of 57 # molybdenum concentrates and molybdenum disulfide (MoS2)  powder gradually decreased, it basically meet the production needs in August, at the end of September molybdenum disulfide (Mos2) powder quality is fully qualified.

The application of Molybdenum disulfide in light industrial machinery
一、The application of MoS2 in film stretching equipment As the film image reflected to the screen, general to enlarge 200-300 times. The clearness and cleanness of film require special strictly. But the film stretching equipment (Pull wide machine)the factory use adopt Lubricate it by diluting (#38 cylinder oil ). For equipment has been working under in about 200℃ high temperature conditions, the oil changed into smoke and be full of the inside and outside of the case, which will pollute the film base seriously. It is a problem that will influence the quality of goods and also damage the health of worker. The reducing device of film stretching equipment (the vertical stretching equipment) is foreign products design in 1930s, the original input shaft is 750 rotation per minute, as the process required, it should be 1000 rotation per minute. So, it need #2 engine oil to be lubricated. In this case, the equipment will be stop to cooling and at the same time, the abrasion is very seriously. The worm gear can be abraded more than 1mm. In 1970, August, By the assistance of brother company, after many testing, the worker of the factory boldly adopt MoS2 the new type lubricant,  which shows its good lubricant property.

MoS2 specific technical process: workpiece cleanness---surface chemical treatment---spraying---film protection. The surface treatment of MoS2: without remove the parts, use nitration---neutralization method.

MoS2 spraying: epoxy resin solid film-forming agent. MoS2 protection film: MoS2 Barium-based grease for longitudinal stretching machine. MoS2 phthalocyanine ketone resin for widening machine. Application effect: (1) The temperature of longitudinal stretching machine drop to 60℃ from 104℃, reduce stop-working and ensure continuous production. Remove the oil and smoke of widening machine and assure product quality and worker's health. (2)It becomes once protection film per half year for widening machine to change oil once per 8 hours and longitudinal stretching machine to change oil once per week. Extend 24 times period of oil change and save more grease and electricity. (3)Slight wear of parts alleviates the work of maintenance labour, improves sanitary condition and extends the working life of machine.

MoS2 in the application of spherical digester (papermaking equipment). Someone from light industry put MoS2 into use of spherical digester and promote the reform of product design. Spherical digester is an equipment used to make pulp, paper and boil chip,bamboo and grass with the method of alkaline and sulphate, which is rotated around the horizontal central axis and is consisted of spherical shell, bearing, transmission, blowing unit, pipeline, insulating layer and etc.with a large different volume of 4740kg, 8450kg, 12500kg, 21500kg respectively available. Inside digester, the working temperature of medium is 175℃ and the bearing of this equipment is made of copper tile using thin oil for lubrication. It becomes a difficult problem to solve because of high temperature and thin oil causing phenomena of grinding tile and bearing. After application of MoS2, the phenomena of grinding tile and bearing is settled in the replace of thin oil for lubrication and reform product design using cast iron instead of copper tile to save non-ferrous metal. According to one shanghai factory's experience, its specific use of formula is: Five copies MoS2 complex calcium lubricating grease and mixing with one copy of MoS2 Oil. The component of the MoS2 complex calcium lubricating grease : 3# complex calcium lubricating grease 95% and 1# Molybdenum disulfide powder 5%. The component of the MoS2 Oil: 70% diesel oil and machine oil and 30% Molybdenum disulfide powder. Usage:（一）、lubricating bearing is composed of the sphere adjustable core cast iron watts and bearing cap, whose upper sticks on the spindle nose. The top of the diamer of axle is nylon pocket (nylon net is 28-40mesh)filled with MoS2 grease, which attached with an iron ore. Depending on the force of iron ore, MoS2 grease daubs via nylon pocket on the spindle nose uniformly to guarantee lubricated, which can be used ten to fifteen days ordinarily. （二）、Generally nylon pocket can be used ten to fifteen until the contact side's MoS2 grease become dry, and turn it over can be used more ten to fifteen days. Used complex calcium lubricating grease also can be used mixed with oil. Moreover, without nylon pocket, complex calcium lubricating grease can be daubed on the bearings, but need one more daub every week. All in all, its essential advantage is that thermo stability, resistance to pressure, avoiding attrition, simple maintenance and improved sanitation.

Combination and application situation of Nano MoS2
As one kind of common solid lubricant, molybdenum disulphide MoS2 has its own feature. One, it is lay structure. Because the binding force between S atoms (VDW) is very week, it is easy to sliding which express good antifriction effect. On the other hand, S atoms on the surface of crystal has excellent adhesion on the metal surface, it will make a strong film. Thus, the lubricating property of molybdenum disulphide MoS2 is superior to graphite. Compare with general molybdenum disulphide MoS2, Nano molybdenum disulphide MoS2 has many excellent properties, such as：excellent friction property, maximum specific surface area, strong absorbability, high reaction activity, especially catalytic performance which is more better in catalyzing hydro-desulfurization. It can be used in manufacture special catalytic material and air storage material. In nano molybdenum disulphide MoS2 layers, it will make intercalation composite material after inserting other perssad which has many excellent physical properties (light, electricity, magnetism, lubricating function). As a result, nano molybdenum disulphide MoS2 materials become a hot research. 1 The synthesis of Nano molybdenum disulphide MoS2 1.1 Liquid phase method of molybdenum disulphide MoS2 1.1.1 The method of precipitation of molybdenum disulphide MoS2

The method of liquid phase precipitation is to synthesize nano molybdenum disulphide MoS2 by use liquid phase chemical reaction. The sulphide and molybdate is as the material dissolved in the water which reactive with molybdenum disulphide MoS2 to be insoluble MoS3, then pyrolysis or restore the sediment of molybdenum disulphide MoS2, and get the nano molybdenum disulphide MoS2 finally. The advantage of method of liquid phase precipitation is simple process, easy handling, high productivity and low cost as well as easy popularization and industrial production. HuXianguo mix sodium sulfide with the aqueous solution of sodium molybdate, add vitriol and catalyzer solution which make the molybdenum disulphide MoS2 to be brown and MoS3 past deposited. Then use distilled water wash it to defecate ion many times. Via remove the water, the dry MoS3 powder pulverized in the mortar, then sintering to desulfuration in hydrogen, can get molybdenum disulphide MoS2 which particle size at 20-30nm. Songxuchun adopts simple precipitation method which uses carbowax as dispersing agent, oxammonium hydrochloride as reductor. Ammonium sulfide as sulfur source, synthesized nano molybdenum disulphide MoS2 which has the character of inorganic fullerene structure. Zengyingfeng adopt other way, they dissolve the NazMaO4 and NH20H•HCI in deionized water, and react at specified temperatures which will restore the Mo6+ to Mo‘+. Then, add NS which dissolved by demonized water to continue reacting. At the same time, add certain volume HCL to adjust the PH. The sediments firstly centrifuged by high speed, then dispersed by ultrasonic in deionized water. Washing and deduct the sediments. At last, put into the freeze drying machine to dewatering and drying, then get the Nano-Molybdenum disulfide. Vohengzhou and his colleagues use the way that use molybdenum disulphide MoS2 instead of hydrogen sulfide react with sodium molybdate in special temperature and acidity condition, then get the MoS3 powder in amorphous state. Finally, in high temperature, after hydrogen desulfurization, get the nano molybdenum disulphide MoS2. 1.1.2 molybdenum disulphide MoS2 Hydrothermal molybdenum disulphide MoS2 Hydrothermal is an effective way to inorganic synthesis and material preparation in high pressure condition. It that make the molybdenum disulphide MoS2 into water solution or organic solvent as the reaction system put into a special hermetic reactor, then heat the reactor reach the critical temperature. Tianye and his colleagues use MaO3, N S•9H2 and NH2NH2•H20 as the material, adopt Hydrothermal synthesis way to make nano molybdenum disulphide MoS2 in relative lower temperature (200 C) and shorter time (24 h). Xuxianyun and his colleagues use Hydrochloric acid thio and ammonium molybdate get molybdenum disulphide MoS2 suspended matter, after filtering, put into the autoclave which inner has the PTFE coating, at the same time add the iron powder and HCL. Heating up the temperature to 280 C slowly in the hermetic autoclave, keep warm 24 h, then cooling to the room temperature, after filtering and vacuum drying, can get the Nano molybdenum disulphide MoS2 which the length is 300-640 nm and the diameter is 20 ~40 nm.

1.1.3 molybdenum disulphide MoS2 solvothermal method molybdenum disulphide MoS2 solvothermal method is based on the method of Hydrothermal, organic solvent instead of water. Because of the diversity, low boiling point and different permittivity, polarity, viscosity of organic solvent, can design new synthesized line according to different solvent system and target products. This way enlarges the applied range of molybdenum disulphide MoS2 Hydrothermal. Choose nonaqueoussolvents such as: benzene, toluene, tetrahydrofuran, dimethoxyethane, ethylenediamine etc. Use thermal synthesize method can synthesized CdS，In2 s，Sb2 s，Cos and Snsl etc chalcogen element compounds and Nano molybdenum disulphide MoS2. Hexiaoyun and his colleagues use Mo powder and S powder as material, quadrol as solvent, react at 160 C then can get rod like and average graining size is 80mn molybdenum disulphide MoS2. 1.2 molybdenum disulphide MoS2 Gas Phase Method Y. Felaman and his colleague use tube furnace heating MoO3 to 850 C, add H2S + (H2 + N2) [4)(H2)= 5%，(N2)= 95%] which make molybdenum disulphide MoS2 react with MoO3 and H2S at reducibility air, synthesize particle and molybdenum disulphide MoS2 nano tube. Gaobin and his assistants use Fullerene nano powder and S as material, in common tube furnace adopt chemical gas phase method make molybdenum disulphide MoS2 at high temperature. molybdenum disulphide MoS2 nano tube is totally ringent and the diameter is even distributed. Some molybdenum disulphide MoS2 nano particle bonded on the nano tube. M. Remska put the molybdenum disulphide MoS2 powder into the quartz tube to heat up and keep it at particular temperature gradient, also, the quartz tube should have some vacuum degree, dozens of day, can get molybdenum disulphide MoS2 at the low temperature side of the quartz tube. 1. 3 Solid state method molybdenum disulphide MoS2 nanotube and microntube. Solid cypress method is the way to produce nano molybdenum disulphide MoS2 by means of physical or chemical process in the solid state of molybdenum disulphide MoS2. The method is typically characterized by easy operation, simple synthesis, high conversion rate, uniform particle size and less pollution. It can avoid or reduce the phenomena of hard agglomeration in liquid phase and the appearance of molybdenum disulphide MoS2 particles conglomerating arising from intermediate steps and high temperature. Y Kuriki etc.[12] use medium agitated mill to grind molybdenum disulphide MoS2 of 5.8m2/g specific surface area for 50 hours to obtain molybdenum disulphide MoS2 powder of 40nm granularity. Zhou Chunli etc.[13] utilize supersonic pneumatic breaker to abrase molybdenum disulphide MoS2 powder to get molybdenum disulphide MoS2 powder with a flake thickness of 30-50nm. Precursor of amorphous a - Mos is generated through the thermal decomposition of (NH4)2MO3 s13•xH20 under 400℃ by C.M.Zelenski etc.[14], then make amorphous a - Mos molybdenum disulphide MoS2 decompose and crystallize to gain nano molybdenum disulphide MoS2 material by the pinpoint of scanning tunneling microscope to generate electric pulse and ultrasound electrochemical probes to produce high temperature and high press effect.

2 Current application of nano molybdenum disulphide MoS2.

2.1 The application of molybdenum disulphide MoS2 in the lubricants molybdenum disulphide MoS2 is a widely used solid lubricant with good chemical stability and is resistant to most acids and anti-radiation. molybdenum disulphide MoS2 is with a molecule of S - Mo - s layered structure, hexagonal system. It is conducive to self- lubricating function because the crystal layer structure of molybdenum disulphide MoS2 is easy to slide to form a texture parallel to the friction surface. Mo atoms and S atoms are bonded with ionic bond between atoms, which enable the intensity of lubricating film higher to prevent lubricating film from being damaged on the metal protruding parts. S atoms are exposed to crystal surface of molybdenum disulphide MoS2, which generates a very strong adhesion to metal surface.

Nano molybdenum disulphide MoS2 microspheres have excellent self-lubricating properties and low friction characteristic. The studies of Tian Yan etc have shown that molybdenum disulphide MoS2 can not onlyimprove maximum nonseizure load of lubricants, but also reduce friction and wear and mend the properties of materials with eighteen alkoxy phosphorodithioic acid pyridinium(PyDDP) to modify molybdenum disulphide MoS2. With nano molybdenum disulphide MoS2 as additive for N46 machine oil by Wo Hengzhou etc., the result indicated nano molybdenum disulphide MoS2 has a much better wear-resistant than normal molybdenum disulphide MoS2. The theory is that nano molybdenum disulphide MoS2 is more likely to happen friction chemical reaction than ordinary molybdenum disulphide MoS2 by forming lubricating film bearing S and Mo. Wei Jin etc found that it is superior to lubricating grease with micro molybdenum disulphide MoS2 for the properity of friction of lubricating grease,drawing mould servie life and wire sruface quality with nano molybdenum disulphide MoS2 additive molybdenum disulphide MoS2 by using nano molybdenum disulphide MoS2 as a solid lubricating additive to be added into copper conductor drawing grease and on-site check of four ball apparatus friction and wear testing and four even pull copper wire drawing process. The research by Wu Cunxi etc. indicated that inorganic fullerene nano molybdenum disulphide MoS2 could obviously improve antiwear and antifriction property of base oil,which that lowest friction coefficient is 0.0127 for compound oil lubrication. The inorganic fullerene nano molybdenum disulphide MoS2 can greatly enhance filming and loading capacity of lubricants, which the principle is that the chemical inertness of inorganic fullerene nano molybdenum disulphide MoS2 particle turn sliding friction into rolling friction. The studies by Zhang Pingyu etc. demonstrated finished surface of nano molybdenum disulphide MoS2 grain LB film is easier to transfer towards antithesis to form absorption reaction layer in the process of friction. Because of nano molybdenum disulphide MoS2 particle's spheroidic structure as a rolling ball, it's wear resistance could be improved gretaly. Tribochemical reaction occurs for LB film during the course of friction and decomposed finish surface make molybdenum disulphide MoS2 nano core play a major role for loading and antiwear. As for close contact metal friction, resilient quasi-spherical nano molybdenum disulphide MoS2 particle can keep them separate from each other and make it easier to cut metal.Due to strong adhesion between nana molybdenum disulphide MoS2 and metal,  friction and wear can be alleviated by further nano molybdenum disulphide MoS2 particle delaminating, which monomolecular nano molybdenum disulphide MoS2 layer transfered to metal surface.

The principle of molybdenum disulphide MoS2 to reduce friction and wear is completely different from lubricating grease. It can continue to keep an excellent resistance performance to friction and wear and mainly applied to difficult maintenance equipments like spacecraft, satellite and military field.Meanwhile, a small amount of molybdenum disulphide MoS2 in the grease can greatly improve the lubrication performance.

2.2 .The application of Molybdenum disulfide in composite

Molybdenum disulfide has favorable layer structure, when the polyimide and other organic molecules into nano-sized molybdenum disulfide layer space to increase the distance, the overall structure of molybdenum disulfide is still a rule of rA-like arrangement, this material in the heat-resistant material, insulation materials and adhesives application has a broad prospect. In case that let molybdenum disulfide which has a certain conductivity as a conductive filler to improve the polystyrene (PS) of the electrical properties, and to make it has a certain antistatic ability but not to change its insulation. Guo shengping etc.[2'] has used benzoyl peroxide as initiator, polyving alcohol as dispersing agent, with styrene monomer, and prepared molybdenum disulphide MoS2 nano composite materials by adopting in-situ polymerization. The research indicated that adding molybdenum disulphide MoS2, the glass transition temperature will be increased, moreover, with increased levels of molybdenum disulfide, PS substrate thermal stability and glass transition temperature stabilized; Volume resistivity of composites reduces sharply with the increased content of molybdenum disulfide, when molybdenum disulfide content increased to about 20%, the volume resistivity of composite materials reached to 108Ω•cm, antistatic requirements have been met. Luo xiangyang etc[22] compounded Nano molybdenum disulphide MoS2 particles Chen ester polymers by adopting in-situ syntheses, then put the product distributed in the lubrication oil to study lubricating property. The result indicated that In heavy and high-speed sliding, Nano molybdenum disulphide MoS2 particles on polymer modified ester of aviation lubricating oil has good lubrication performance. Zhou lichun etc [23] produced Polyethylene nano-molybdenum disulphide MoS2 composite materials by adopting fusion alloying method to study its electrical property and its micro structures. The result indicated that when the mass fraction of molybdenum disulfide is greater than 15%, resistance of the system increased, the percolation threshold for the composite is 15%; molybdenum disulfide dispersed in polyethylene matrix, molybdenum disulfide conductive particles contact with each other to form a conductive network chains. Liyong Liang etc.[24] used DC magnetron sputtering method, SKD - 11 tool steel substrate molybdenum disulfide on the co-deposition of nano-composite films and Ti, can greatly reduce the friction coefficient of steel surface to improve frictional properties of steel. Appropriate increase in film thickness will help improve the wear resistance of steel.

2.3 Molybdenum Disulfide in other applications Compared with general molybdenum disulfide, surface atoms of molybdenum disulfide nano-specific form was significantly increased and form much more vacancy of sulphur, to improve its catalytic activity and selectivity more higher, which can be used as heavy oil conversion, oil refining and highly active hydrogenation catalyst. Molybdenum disulfide nanotubes in carbon monoxide methanation process as a catalyst has high selectivity and reactivity. Nano Molybdenum disulfide is a catalyst for coal liquefaction. As the structural peculiarities, IF - molybdenum disulfide in a rechargeable electrode materials has potential application market. On one hand that this structure can provide more space for injecting of lithium electrons, on the other hand, molybdenum disulfide's thermodynamic stability of this material can make repeated use of this material to withstand repeated charge and discharge process. Moreover,IF- molybdenum disulfide nanoparticles and nanotubes in hydrogen storage, optical, mechanical and chemical industry hsve a wide range of potential applications market. 3 Conclusion Molybdenum disulfide nano-preparation methods are diverse, each preparation has its advantages and disadvantages, according to the specific use of molybdenum disulfide and the reality of the conditions and requirements to decide. Molybdenum disulfide liguid phase method is low cost and large production with controlled forms, high purity of products, which can prepared in line with the needs of different functional molybdenum disulfide but there are deficiencies, such as long process of raw materials for high demands and easy reunion of products.Molybdenum disulfide solid phase process is simple, generally do not destroy the natural lattice of molybdenum disulfide, but high requirement of equipments, high energy consumption, from which method the product of particle size of molybdenum disulfide and its form are not easy to control. Gas-phase process is simple, quick response, but the equipment for high purity molybdenum disulfide product is not high. Recently the synthesis of molybdenum disulfide hasn't solved the problem that the small particle size, surface energy and other factors caused the reunion. The other hand, nano molybdenum disulfide is easily oxidized in the air, and difficult to disperse in non-polar oil, so how to modify the surface of molybdenum disulfide needs a lot of work. In applications, the application of nano molybdenum disulfide mainly focus on lubricant additives, and the other aspects of application, such as molybdenum disulfide catalyst, molybdenum disulfide optoelectronic and kinds of composite of molybdenum disulfide remain to be further studied.

Nano-molybdenum disulfide properties
Nano-molybdenum disulfide (MoS2) consists of nano-micro and nano composites, nano-thin layer, fullerene-like nanoparticles and nanotubes. Compared with ordinary molybdenum disulfide, nano MoS2 has been further improved in many properties, mainly performance in the following respects: large specific surface area, more adsorption capacity, high reactivity, more stronger catalytic properties especially the performance of catalytic hydrogenation desulfurization, which can be used to prepare special catalytic and gas materials; Nano-thin layer of molybdenum disulfide approaches to 1178e V, and matches the energy of light, also has a better prospect in application; With the smaller of molybdenum disulfide grain size, its adhesiveness in friction materials surface and coverage are significantly improved, antiwear and frictional reducing performance are also have been improved well; Even more interesting thing is that when organic groups inserted in molybdenum disulfide layers, may form 2d nano compound, which is not simple to add for the properties of inorganic and organic, but to show a number of strange features.

Solid lubrication mos2 material preparation methods
Solid lubrication mos2 material preparation methods

Putting a certain amount of solid lubricant molybdenum disulfide powder in a sealed gear box, through the gears moving to rubbing the surface, rely on its adhesive force attached to the gear teeth, which forms the most simple solid lubrication molybdenum disulfide friction. With the continuous improvement of requirements for solid lubricantion molybdenum disulfide material and advancement of science and technology, solid lubrication mos2 preparation process is also improved. From the perspective of preparation principle, solid lubrication MoS2 material preparation methods can be summarized as the following methods: 1. Mechanical mixing Several kinds of complementary material mechanical mixing to make it a homogeneous mixture. 2. Hot pressing Add another (or more) other powder in a powder type base material, by mechanical mixing to make it a homogeneous mixture. And then hot-pressing (in a different atmosphere, pressure and temperature), making it a certain mechanical and tribological properties of the whole. Prepared by this method, solid lubricantion molybdenum disulfide materials are much more, which suitable for metal-based, non-metallic and ceramic-based and other lubrication molybdenum disulfide materials. 3. Caking By use of bonding agent, to make lubrication mos2 powder bonding in substrate surface. If make a strength metal or organic waving material as backing material, then bonding lubricating molybdenum disulfide layers on it, to form the strength and lubricating molybdenum disulfide composite material layer. 4. Vapor deposition Through ∫ vapor deposition (including sputtering, ion plating and plasma spraying etc.) or chemical gas deposition, lubricating MoS2 particles are adhered on the substrate surface to form a solid MoS2 lubricant coating. The adhesion force is presented by binding force of between atoms. 5. Chemical Reaction By chemical plating, including multi-layer coating and composite plating etc., lubricating MoS2 particles are attached on the substrate surface to get solid lubricant coating. 6. Casting Lubricating MoS2 particles are added into liquid substrate MoS2. By mixing to produce a homogeneous mixture, after solidification to get a entirety with a certain strength and tribological property. 7. Dipping Lubricating MoS2 particles are filled into pores of porous substrate MoS2 by means of impregnation so that substrate MoS2 and lubricating MoS2 can form a homogeneous solid lubricating MoS2 materials. 8. Blending At a certain pressure and temperature conditions, several polymer materials cross-linked to form a novel high polymer MoS2 lubricating materials, which is a non-metallic base filled MoS2 materials