Process Description
The Combustion Powder Flame Spray process uses a siphon plug system to mix fuel gas of acetylene, propane or hydrogen with oxygen in precise volumetric proportions to provide consistent operation and prevent the possibility of backfire. Powder as the coating feedstock is continually fed into the ignited fuel gas-oxygen flame where it is melted by the heat of combustion, propelled towards the prepared workpiece surface and rapidly solidifies to form the coating. A cap that feeds compressed air surrounds and appropriately shapes the flame.
Schematic cross-section of a typical combustion powder spray gun
The combustion powder process is similar to the combustion wire process, except that is has the advantage of using powder materials as the coating feedstock, which allows for a much wider range of coating material options. In addition, the use of powder allows for a greater degree of freedom for spray gun manipulation.
Key components of combustion powder spray system
Features of the Combustion Powder Thermospray® Spray Process:
Applies a range of coating materials, including self-fluxing alloys, fine ceramics, self-bonding materials, clearance control materials and other alloys
Configurations from economical manual systems to fully automated production systems are available
Can be portable for on-site coatings
High spray rates with low gas consumption
Excellent for wear and corrosion resistance
Coatings can be machined to final dimensions and finish
Coating of complex geometries
Easy masking of areas that should not be coated
Coating of internal geometries is possible
Very simple to operate and maintain
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