Sprayed coating formation device and sprayed coating formation method

Abstract

A sprayed coating formation device for forming a sprayed coating on an inner surface of a bore of a cylinder block is provided. The sprayed coating formation device includes a molten-particle jet portion configured to melt a thermal spray material by an arc discharge generated by applying a current to the thermal spray material. The molten-particle jet portion includes a gas jet portion. The gas jet portion is configured to jet a gas to the thermal spray material that is melted, in a direction toward the inner surface. A heater is configured to heat the gas in advance before jetting.

What is claimed is: 
     
         1 . A sprayed coating formation device for forming a sprayed coating on an inner surface of a bore of a cylinder block, the sprayed coating formation device comprising:
 a molten-particle jet portion configured to melt a thermal spray material by an arc discharge generated by applying a current to the thermal spray material, the molten-particle jet portion including a gas jet portion, the gas jet portion being configured to jet a gas to the thermal spray material that is melted, in a direction toward the inner surface; and   a heater configured to heat the gas in advance before jetting.   
     
     
         2 . The sprayed coating formation device according to  claim 1 , wherein
 when the sprayed coating is provided, the molten-particle jet portion is inserted into the bore of the cylinder block, and the heater is placed outside the bore of the cylinder block.   
     
     
         3 . A spray coating formation method for forming a sprayed coating on an inner surface of a bore of a cylinder block by use of a sprayed coating formation device, the sprayed coating formation device including a molten-particle jet portion and a heater, the molten-particle jet portion including a gas jet portion, the sprayed coating formation method comprising:
 heating, by the heater, a gas in advance before jetting;   melting a thermal spray material by the molten-particle jet portion, the thermal spray material being melted by an arc discharge generated by applying a current to the thermal spray material; and   jetting, by the gas jet portion, the gas to the thermal spray material that is melted, in a direction toward the inner surface.   
     
     
         4 . The spray coating formation method according to  claim 3 , wherein
 when the sprayed coating is provided, the molten-particle jet portion is inserted into the bore of the cylinder block, and the heater is placed outside the bore of the cylinder block.