Formation of glassy alloy coating by high velocity thermal powder deposition and their applications

Glassy alloy is a promising material for a wide range application because of its superior mechanical and chemical characteristics. If the forming technology, which realizes a glassy alloy coating on the surface of various products, was established, its application will be widely expanded. In this description, first, we described to produce the glassy phase coating by using Fe₄₃Cr₁₆Mo₁₆C₁₅B₁₀ glassy alloy powder and HVOF (High Velocity Oxy-Fuel) spraying process. And it was coated onto the substrate such as stainless-steel, aluminum-alloy and magnesium-alloy. As a result, we confirmed it possible to produce them on each substrate. Second, to examine the formation process to attain the glassy phase coating, we carried out experiment of coating, using Fe₄₃Cr ₁₆Mo₁₆C₁₅B₁₀ glassy alloy powder and crystallized powders of it, and two different thermalspraying-equipment (HVOF: High Velocity Oxy-Fuel, APS: Atmospheric Plasma Spraying). As a result, in HVOF, most glassy alloy particles were estimated to coat with the glassy phase due to its low viscosity flowing in supercooled liquid state without melting. And we also confirmed it possible to get the glassy phase coating extremely stably in HVOF, as compare with coating in APS that almost particles were completely melted. As the examples to practice application, we introduced "erosion resistance against lead-free solder", "coating for metal bipolar plate" and "soft magnetic coating".