High-Velocity Oxygen Fuel Surfacing
High-velocity oxy-fuel flame spraying (HVOF) produces dense wear-resistant coatings by high-speed flame spraying. They minimize oxide inclusions and improve the coating quality.
Physical-Chemical Working Mechanism
The flame spraying occurs through the rapid mixing of fuel and oxygen, which burn at high speed. This leads to a dense wear-resistant coating on the metal surface.
Metallurgical Relevance & Welding Risks
This technique minimizes oxide inclusions in the coating, which increases strength and toughness. Incorrect settings, however, can lead to an uneven wear-resistant layer or to overheating, which can damage the metal.
Shop Practice & Action Steps
Use a flame spray gun with a speed of at least 100 m/s. Make sure the fuel-oxygen mixing ratio is set correctly (usually 1:2). Cool the metal slowly after the spraying process to ensure an even wear-resistant layer.