| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a machinable ceramic, which is dense and has reduced grinding resistance, and a sliding member and a pump. <P>SOLUTION: Disclosed is a machinable ceramic consisting essentially of alumina crystal particles and a grain boundary phase. The machinable ceramic has open porosity of not more than 0.1%. Since the alumina crystal particles include large diameter particles 1 of alumina having pores 7 at the inside and having a diameter of not less than 10 μm and smaller diameter particles 3 of alumina having a diameter of not more than 5 μm, its open porosity reaches ≤0.1%, thus the ceramic is made dense and has improved strength. Further, upon its grinding, cracks are generated from the pores 7 in the large diameter particles 1 of alumina, and particle removal occurs in the grinding. In this way, its grinding resistance can be reduced, and its workability can be improved. <P>COPYRIGHT: (C)2009,JPO&INPIT |
