| 摘要 |
PURPOSE:To form easily and efficiently the titled whisker on a sintered body block by calcining a block obtained by molding a mixture of specified whisker material powder and precalcining the molded body in a gaseous N2 atmosphere. CONSTITUTION:A powdery mixture of Si3N4 and 0.5-10wt% oxide ceramic selected from Al2O3, Y2O3, MgO, SiO2, etc. and an organic binder such as PVA are mixed by a wet method, dried, then molded in the form of a plate or a cylinder, and precalcined at 600-1,000 deg.C to obtain a cylindrical block. The block is then calcined in an electric furnace in a gaseous N2 atmosphere at 1,400-1,900 deg.C to form an Si3N4 whisker having about 1mum diameter on the surface and at the inside of the sintered body block. The sintered body block wherein the Si3N4 whisker is uniformly formed on the surface and at the inside or the block impregnated with the same or the different kind of ceramic powder is hot-pressed at 1,700 deg.C to obtain easily a ceramic whisker-reinforced composite ceramic. |
