| 摘要 |
PROBLEM TO BE SOLVED: To solve a problem an weak impact resistance with a sialon ceramic in which the growth of particles in a sintered product are accelerated to form columnar particles or which is mixed with short fibers to form a composite material. SOLUTION: This sialon ceramic comprises a sintered product containing β-sialon in an amount of 80-90wt.%. Therein, a volume occupied with columnar particles constituting the sintered product and having minor axis diameters of >=1μm and aspect ratios of >=3 and further with uniaxial particles having particle diameter of <1μm and aspect ratios of <3 is >=70% based on the total volume of the β-sialon, and the area ratio of the columnar particles to the uniaxial particles is 1:1 to 3:1 in the same cross section. This method for producing the sialon ceramic comprises adding the oxide of the group IIIa element in the periodic table in an amount of 3-8wt.% as a sintering auxiliary to sialon powder, preparing the mixture into particles having a specific surface area of 12-15m<2> /g, molding the particles, sintering the molded product at the atmospheric pressure and further subjecting the sintered product to a HIP treatment, or hot-pressing the molded product. |
