| 摘要 |
PURPOSE:To provide a means to prevent deterioration of characteristics due to decomposition end decarburization of carbide when a hard film is formed on a metal or ceramic substrate by using a thermally s praying material comprising carbide and coupled metal. CONSTITUTION:When a thermal spray material comprising carbide of one of IV, V or VI group metals and a coupled metal is sprayed, carbon is added to the thermal spray material by the amt. corresponding to the decarburizing at. of the carbide. The compounding ant. of carbon is determined so as not to cause a problem of production of multiple carbide after thermal spraying, and preferably, the carbon amt. is controlled to form a phase of specified carbide and coupled metal. The carbon to be added is, for example, pulverized graphite, spherulite graphite, carbon black, etc., and especially, a graphite powder hardly oxidable is used. Or, as for the carbon to be added, particles having the coupled metal coating layer formed on a graphite powder surface obtd. by mechanofusion of graphite powder and coupled metal can be used. |
