THERMAL SPRAYING POWDER AND METHOD FOR FORMING THERMAL SPRAY COATING

摘要

A first thermal spray powder of the present invention includes granulated and sintered yttria particles obtained by manufacturing a raw material power and sintering the raw material power in air or oxygen. The primary particles constituting the granulated and sintered yttria particles have an average particle size of 0.5-1.5 ��which is more than 1.11 times as large as the raw material powder. A thermal spray layer which has high etching resistance about plasma having the output power of more than 0.8 W/cm2 formed on the thermal coating of a unit area by the first thermal spray powder. A second thermal spray powder of the present invention includes granulated and sintered yttria particles obtained by manufacturing the raw material power and sintering the raw material power in air or oxygen. The primary particles constituting the granulated and sintered yttria particles have an average particle size of 3-8 �� A thermal spray layer which has high etching resistance about plasma having the output power of less than 0.8 W/cm2 formed on the thermal coating of a unit area by the second thermal spray powder.