| 摘要 |
A sintered aluminum titanate-mullite base ceramic having a chemical composition of not more than 0.8% of MgO, from 53 to 74% of Al2O3, from 14 to 33% of TiO2, from 1.2 to 5% of Fe2O3, from 6 to 20% of SiO2, and not more than 0.3% of (CaO+Na2O+K2O), 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 Al2O3, from 34 to 50% of TiO2, from 3 to 7% of Fe2O3, not more than 1% of SiO2 and not more than 0.3% of (CaO+Na2O+K2O) with from 35 to 60% of a starting material of mullite essentially consisting of from 18 to 32% of SiO2, from 68 to 82% of Al2O3, and not more than 0.85% of (Fe2O3+TiO2+CaO+MgO+Na2O+K2O), at least one of said aluminum titanate starting material and said mullite starting material being fired, and molding a resulting mixture, and firing a thus obtained molding at from 1,550 DEG to 1,700 DEG C. in an oxidizing atmosphere. The alumina titanate starting material may contain not more than 0.1% of MgO.
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