Combustion Powder Spray

It is a relatively flexible process in that it can be used to apply metals, alloys, carbides, polymers and even some ceramic powders. 

Key benefits of this process 

• Equipment investment costs can be low
• Greater flexibility of feedstock choices compared to Combustion Wire Spray
• Coatings can be machined to final dimensions and finish

Typical applications 

• Crank shafts
• Sucker rod couplings
• Gas turbine shrouds for clearance control
• Dimensional restoration of worn or mismachined parts

Process description

The feedstock material, in powder form, is continually fed into a fuel gas-oxygen flame where it is then melted by the heat of combustion. For most combustion powder spray systems, the powder is fed via a feeder using a carrier gas to transport it to the spray gun. The mixed gasses accelerate the melted particles onto the prepared workpiece surface where it rapidly solidifies to form a coating.  

Process basics

• Heat source: combustion 
• Material: powder (metals, alloys, metallic blends or ceramics, ) 
• Flame temperature: max. 3 100 °C (5 600 °F) 
• Particle velocity: up to 50 m/s (165 ft/s) 
• Approximate application rate: 35 to 150 g/min (4.5 to 20 lb/h)