| 摘要 |
Ceramic sintered bodies 1, 11 have first phases 3, 13 and second phases 2, 12, respectively. The first and second phases contact each other. The first phase has a thickness "TA" larger than the thickness "TB" of the second phase. 80 percent or more of particles constituting the first phase have diameters in a range of 0.2 to 3 mum, and 80 percent or more of particles constituting the second phase have diameters in a range of 0.3 to 3 mum.
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