| 摘要 |
<p>A sintered aluminum titanate-mullite base ceramics having a chemical composition of not more than 0.8% of MgO, from 53 to 74% of Al<Sub>2</Sub>O<Sub>3</Sub>, from 14 to 33% of TiO<Sub>2</Sub>, from 1.2 to 5% of Fe<Sub>2</Sub>O<Sub>3</Sub>, from 6 to 20% of Si0<Sub>2</Sub>, and not more than 0.3% of (CaO+Na<Sub>2</Sub>O+K<Sub>2</Sub>O), and an amount of glass in mullite base matrices of the sintered body being not more than 5% when measured at a section of the sintered body. This aluminum titanate-mullite base ceramic is obtained by compounding from 40 to 65% of a starting material of aluminum titanate essentially consisting of from 45 to 62% of Al<Sub>2</Sub>O<Sub>3</Sub>, from 34 to 50% of Ti0<Sub>2</Sub>, from 3 to 7% of Fe<Sub>2</Sub>O<Sub>3</Sub>, not more than 1% of SiO<Sub>2</Sub> and not more than 0.3% of (CaO+ Na<Sub>2</Sub>O+K<Sub>2</Sub>O) with from 35 to 60% of a starting material of mullite essentially consisting of from 18 to 32% of SiO<Sub>2</Sub>, from 68 to 82% of Al<Sub>2</Sub>O<Sub>3</Sub>, and not more than 0.85% of (Fe<Sub>2</Sub>O<Sub>3</Sub>+TiO<Sub>2</Sub>+CaO+MgO+Na<Sub>2</Sub>O+K<Sub>2</Sub>O) at least one of said aluminum titanate starting material and said mullite starting material being fired, and molding resulting mixture, and firing a thus obtained molding at from 1,550 to 1.700°C in an oxidizing atmosphere. The alumina titanate starting material may contain not more than 0.1% of MgO.</p> |
