| 摘要 |
PURPOSE: A ceramics spray coating method is provided to improve abrasion characteristics, mechanical properties and sound characteristics of high sound part of existing piano frame and particularly improve characteristics of expensive grand piano, and a piano frame manufactured by the ceramics spray coating method is provided. CONSTITUTION: The ceramics spray coating method comprises the process of coating Cr3C2 or WC +12%Co on a matrix of F25C cast ion by plasma spray coating or HVOF (high velocity oxygen fuel) method under the conditions that a bond coating agent is NiCr/A195/5, arc gas pressure is 50 psi, subsidiary gas pressure is 100 psi and powder gas pressure is 40 psi, wherein interfacial structure and characteristics are improved in HVOF method compared to plasma spray coating method when spray coating carbide based material (WC based or CrC based material) by spray coating a WC based or CrC based material on the surface of high sound part of piano frame, and a coating layer having adhesion strength of 50 kg/mm¬2 or more, hardness of 1,000 Hv or more, porosity of 10% or less and thickness of 100 μm or more is formed when spray coating carbide based material on the surface of high sound part of piano frame by HVOF method.
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