Flame powder spraying


In this process, the spray material is in powder form and is transported by means of a transport gas through the spray gun and injected centrally in a burning acetylene-oxygen mixture, melted and transported to the workpiece where it forms a coating.
This process has 2 versions, being the "cold" and the "hot" spraying process.
During the "cold" spraying process, the temperature of the base material will remain between 50 and 200°C, which means there is no chance of structure changes or distortions, making this process is highly suitable for repair applications.
During the "hot" spraying process, the sprayed-on layer is melted and diffusion causes an extremely strong bond with the base material. The spray powders that are used, the so-called self-fluxing alloys, have nickel or cobalt as base materials, possibly with added wolfram carbides to make the coating even more wear-resistant.

 

 

 

 

 

Characteristics of “cold” sprayed coating

• Microporous lamellar structure, self-lubricating
• Good pressure resistance
• Versatile and choice of many materials

Characteristics of self-fusing coatings

• Metallurgically bonded with the substrate
• Resistant against line, impact and point loads
• Homogenous and closed structure

Typical coatings

• Self-fusing alloys NiCrBSi (Fused, Fusing, Self-fluxing)
• Nickel base alloys (Colmonoy types)
• Cobalt base alloys (Stellite types)
• Various stainless steel alloys
• Cermets, carbides (hard metals)

 

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