PURPOSE: To strengthen a base material itself by surface strengthening treatment ensuring corrosion and heat resistances by forming an aluminized film on the surface of the base material and then forming a thermally sprayed film of ceramic, etc.
CONSTITUTION: A base material is pretreated by aluminizing before thermal spraying to form an Fe-Al alloy layer on the surface of the base material. This alloy layer renders corrosion and heat resistances to the surface of the base material and strengthens the base material. Ceramic such as Al2O3 is then thermally sprayed on the aluminized film to form a corrosion and heat resistant thermally sprayed film as a laminated film. In the case where the aluminizing is hot dip aluminizing, secondary diffusion is carried out by high-frequency induction heating or other method so as to further extend the resulting Fe-Al alloy layer.
TAKASAKI NOBUKIMI
KUMAKAWA MAKOTO
TOGUCHI AKIHIKO
