Patent ID: 7862911

Claim:
A thermal spray coating made of cermet containing boron, molybdenum, chromium, and cobalt on a surface of a base member, wherein a value gained by dividing, by a coefficient of thermal expansion of the base member, a value that is gained by dividing a coefficient of thermal expansion of the thermal spray coating by a thickness of the thermal spray coating (unit: Î¼m) is no less than 0.15Ã—10 âˆ’2 , wherein a formula: tâˆ’23e 0.3P â‰§0 (where, 0<Pâ‰¦4) is satisfied when a porosity of the thermal spray coating is defined as P (unit: %) and the thickness of the thermal spray coating is defined as t (unit: Î¼m), and the average particle size of the cermet is between 5 to 50 Î¼m.