| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a polycrystalline Al<SB>2</SB>O<SB>3</SB>sintered compact which is high in visible light linear transmittance and has sufficient mechanical strength, and to provide a method of manufacturing the polycrystalline Al<SB>2</SB>O<SB>3</SB>sintered compact. <P>SOLUTION: The polycrystalline Al<SB>2</SB>O<SB>3</SB>sintered compact has ≤1 μm average particle diameter, ≥99.9% relative density and ≤0.3 μm average pore diameter. A sintered compact having ≤1,000 ppm impurities, a sintered compact having ≥75% linear transmittance in 0.5-1 μm wave length, a sintered compact having ≥800 MPa 3 point bending strength or a sintered compact having ≥19 GPa Vickers hardness is preferable in the sintered compact. <P>COPYRIGHT: (C)2008,JPO&INPIT |
