| 摘要 |
PURPOSE:To obtain improved spalling resistance and to prevent the occurrence of cracks and peeling by specifying the porosity and pore size of a carbon substrate for coating silicon carbide. CONSTITUTION:A carbon substrate having 5-30% porosity and contg. no pore having >=100mum size and 0.04-0.1cc/g pores having 0.1-10mum size measured with a mercury porosimeter is used. When this substrate is coated with silicon carbide, a structure composed of an outer surface layer 1 of silicon carbide alone, an intermediate layer 2 of a mixture of silicon carbide with carbon, and a carbon substrate layer 3 is obtd., and by using said carbon substrate as the layer 3, the layer 2 is formed in a uniform thickness, and the layer 1 is also formed in a uniform thickness almost in parallel with the layer 2. |
