Method of producing a flame-spray-coated article and flame spraying powder

摘要

Powder which has primary particle size of not larger than 10 mu m and is formed of mixture of Ni powder and Cr powder added with hard particles containing carbide is mixed with Cr3C2 powder and granulated and sintered, whereby flame spraying powder having secondary particle size of 5 to 53 mu m is formed. The flame spraying powder thus formed is flame-sprayed under conditions which will cause fused Ni.Cr to cover Cr3C2 particles which are not fused, thereby binding the Cr3C2 particles and causes the thickness of one Ni.Cr layer to be smaller than 5 mu m. In this manner, flame spray coating the porosity of which is not larger than 2% and the hardness of which is not lower than 700 (Hv: 200 g) can be obtained.