Abstract: A ceramic coating according to at least one embodiment of the present disclosure includes: a bond coat layer formed on a substrate; and a ceramic layer formed on the bond coat layer. The ceramic layer has a first region in contact with an interface between the ceramic layer and the bond coat layer and a second region father away from the interface than the first region from the interface. In a cross-section along a thickness direction of the ceramic layer, the number of crack intersection points at which two or more cracks intersect per unit area in the ceramic layer is larger in the first region than in the second region.

Abstract: A method for applying a thermal barrier coating according to at least one embodiment of the present disclosure includes: a step of forming a bond coat layer by high velocity flame spraying on a heat-resistant alloy base material of an object disposed in a thermal spray booth, with a thermal spray gun disposed in the thermal spray booth; and a step of forming a top coat layer by thermal-spraying a suspension containing ceramic powder by high velocity flame spraying on the bond coat layer of the object disposed in the thermal spray booth, with the thermal spray gun disposed in the thermal spray booth.

Abstract: A method for applying a thermal barrier coating according to at least one embodiment of the present disclosure includes: a step of forming a top coat layer on a bond coat layer formed on a heat-resistant alloy base material of an object. The step of forming the top coat layer includes forming the top coat layer by thermal-spraying a suspension containing ceramic powder by high velocity flame spraying, while maintaining a temperature of the top coat layer at not lower than 300° C. and not higher than 450° C.

Abstract: A method for applying a thermal barrier coating according to at least one embodiment of the present disclosure includes: a step of forming a top coat layer on a bond coat layer, which is formed on a heat-resistant alloy base material, by thermal spraying, while ejecting a gas from a plurality of holes opened in a surface of the heat-resistant alloy base material.

Abstract: A ceramic coating according to at least one embodiment of the present disclosure includes: a bond coat layer formed on a substrate; and a ceramic layer formed on the bond coat layer. The ceramic layer has a first region in contact with an interface between the ceramic layer and the bond coat layer and a second region father away from the interface than the first region from the interface. In a cross-section along a thickness direction of the ceramic layer, the number of crack intersection points at which two or more cracks intersect per unit area in the ceramic layer is larger in the first region than in the second region.

Abstract: A method for producing an impeller, includes the following steps: a forming step of forming the impeller by fused deposition modeling; and a polishing step of polishing a wall that defines a channel of the impeller using particulate polishing materials. The particulate polishing materials are sprayed on the wall of the channel or the wall of the channel is rubbed with the particulate polishing materials in the polishing step.