Abstract: A method for easily and uniformly forming a film at a low cost, which is comprising a diffusion-barrier layer 3 and a coating layer 4, on a surface of a substrate 1. The method has a preliminary oxidation step of forming a substrate oxide layer 2 by oxidizing the substrate 1, and a step of coating the surface thereof with a coating material containing at least one alloy or a compound, which includes an element forming an oxide having a low enthalpy of formation as compared to that of the oxide of the substrate oxide layer 2, and as a result.

Abstract: A highly thermally conductive composite material is characterized in that it contains 20-75 Vol % of SiC, with the balance being Cu, and further contains a reaction preventive layer interposed on the interface between SiC and Cu for preventing a reaction between the two substances. Specifically, the reaction preventive layer is a thin film having a thickness of 0.01-10 microns, consisting of carbon or a carbide of at least one element selected from the group consisting of Cr, Nb, Ta and W. In particular, the composite material has a thermal expansion coefficient of 4.5-10×10−6/K and a thermal conductivity of 200 W/mK or higher.

Abstract: A high temperature Nb-base alloy material which contains a ductile Nb-base metal phase to secure the toughness of the alloy at a normal temperature, and yet it can provide a dense oxide film in a high temperature oxidative atmosphere, thereby it can maintain excellent oxidation resistance even when the coating is broken, i.e. it has self repairing function, is provided. The high temperature oxidation resistant alloy material is constructed by adding a trace amount of metal Mg which is necessary to form a dense oxide film comprising MgO as a main component on the surface in an elevated temperature oxidative atmosphere, to a composite phase alloy comprising not less than 10% by volume of a Nb-base solid solution metal phase represented by atomic ratio as Nb—(15-40%)Ti—(5-20%)Al and the remainder of one or more kinds of intermetallic compound phases or ceramic phases having high oxidation resistance.