| 摘要 |
PURPOSE:To obtain the subject refractory having improved flexural strength, thermal shock resistance, hardness, abrasion resistance and corrosion resistance by mixing BN powder, a specific boride powder, a sintering assistant and Si3N4 powder, forming the mixture and firing the product under a specific condition. CONSTITUTION:Si3N4 powder is mixed with 5-20wt.% of BN powder, 3-30wt.% of at least one kind of powder selected from borides of Zr, Hf, Ti and Cr and 5-20wt.% of a sintering assistant powder (e.g. MgO) in wet state. The mixture is dried and formed to a prescribed form to obtain a formed article. The article is fired in nitrogen gas atmosphere containing 5-30vol.% of Ar gas under atmospheric pressure or over. |
