| 摘要 |
PURPOSE: To ensure superior oxidation resistance by molding a powdery mixture of specified SiC powder with Si3 N4 powder and a carbonaceous material and firing the resultant molded body in a nonoxidizing atmosphere not contg. N2 . CONSTITUTION: The particle size distribution of SiC powder having 1-50μm average particle diameter is regulated so that the ratio (D10 /D50 ) of the particle diameter of 10% cumulative particle size of the distribution to that of 50% cumulative particle size is made >=0.2 and the SiC powder is mixed with a powdery mixture prepd. by mixing Si3 N4 with a carbonaceous material such as carbon black so that the molar ratio of metallic Si forming the Si3 N4 to carbon is made 1.0-2.0. Proper amts. of water and an org. binder such as PVA are added to the resultant powdery mixture contg. 20-70wt.% SiC and they are kneaded and molded in a prescribed shape. The resultant molded body is dried, dewaxed by heating and fired at 1,600-2,300 deg.C in a nonoxidizing atmosphere not contg. gaseous N2 to obtain the objective porous electrically conductive SiC sintered body having about 1-40μm pore diameter and about >=40% porosity. |
