User:Kaneewiki/OLES2129/draft

Title of Proposed Article - Detonation Spraying
 https://en.wikipedia.org/wiki/User:Kaneewiki/OLES2129/draft 

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Associated WikiProjects
There are two different categories of WikiProjects that this article could be associated with. The first is the WikiProject Technology as detonation spraying is a type of technology. The second is the WikiProject Metalworking as the process of detonation spraying involves working with metal.





Brief Topic Overview
Detonation spraying is one of many forms of thermal spaying techniques used to apply a protective coating at supersonic velocities to a material in order to change its surface characteristics; namely to improve durability of a component. Detonation spraying involves the highest velocities (3500 m/s shockwave that propels the coating materials) and temperatures (3900 °C) of coating materials compared to other thermal spaying techniques which allows it to apply low porous (below 1%) and low oxygen content (between 0.1-0.5%) coatings. This allows the application of very hard and dense surface coatings which are useful as wear resistant coatings. For this reason, detonation spraying is commonly used for protective coatings in aircraft engines, plug and ring gauges, cutting edges (skiving knives), tubular drills, rotor and stator blades, guide rails or any other material that is subject to high wear and tear.

Detonation spray coatings are applied by a detonation gun (D-gun) which is composed of a long-water-cooled metal barrel with inlet valves for introducing gases and powders into the chamber. A preselected amount of the desired protective coating material (in powder form) is introduced to the chamber and oxygen and fuel (generally acetylene) are ignited in the chamber by a spark plug to create a supersonic shock wave that propels the melted coating powder out of the barrel and onto the objected being sprayed. The barrel is then cleared using a short burst of nitrogen before the D-gun is ready to be fired again. D-guns typically operate at firing rates of between 1-10 Hz. Many different mixtures of coating powders and D-gun settings can be used to change the properties of the final coating. Common powder materials used include: alumina-titania, alumina, tungsten carbide-tungsten-chromium carbide mixture with nickel-chromium alloy binder, chromium carbide, tungsten carbide with cobalt binder.

Notability and Neutrality
Detonation spraying is mentioned in the ‘Thermal Spraying’ Wikipedia article (https://en.wikipedia.org/wiki/Thermal_spraying). It includes a very small paragraph on what a D-gun is and lists ‘detonation spraying’ as one of many thermal spraying techniques. Therefore, detonation spraying is a notable topic as it’s already been mentioned on Wikipedia (following the Wiki notability guideline). A detonation spraying article is needed to further this existing article as there is an absence of detail on the topic. This added information can be referenced from at least seven reliable independent of the subject sources. A detonation spraying article also abides by the ‘What Wikipedia is not policy’ and for these reasons would be a notable article to add to Wikipedia.

This article will maintain neutrality as I will not use any of my own original research to write about the topic as there are many great sources on the topic. Also, I will avoid author bias in order to maintain a neutral point of view.

Structure
I.        Lead Section (explaining what detonation spraying is)

'''II. D-gun''' (will explain what a D-gun is with diagrams and photos)

a.     Components

b.     Operation

c.    Cycle of Operation Overview (summary of operation process)

III.        Coating Materials
a.     Types

b.    Material Specific Processes

c.     Evaluation