| 摘要 |
PROBLEM TO BE SOLVED: To obtain a pyrogenous material composed of mainly MoSi2 , which has excellent pest resistivity and of which performance does not deteriorate over a long period of time. SOLUTION: Content of a nonconforming component is reduced which spreads spaces of three dimensional network structures in a vitreous coating film and causes decline of antioxidative property. The formed vitreous coating film becomes low-oxygen diffusible by reducing each content of Al, Ca, Mg, Na contained in a substrate to be <=300 ppm, preferably <=100 ppm. |
