| 摘要 |
Silicon nitride sintered bodies having a high density, high mechanical strength and high fracture toughness, contain specific amounts of oxides or oxynitrides of Sr, Mg, a rare earth element and Zr respectively and the remainder being Si3N4, are produced by shaping a raw batch material containing compounds of each of Sr, Mg, a rare earth element and Zr in given amounts, wherein Zr is added by abrasion of the grinding media and the mixture is pressurelessly sintered in nitrogen or an inert gas atmosphere. |
