| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an alumina-based sintered compact excellent in corrosion resistance, heat shock resistance, and durability, to provide a production method thereof, and to provide a heat treatment member comprising the alumina-based sintered compact. <P>SOLUTION: The alumina-based sintered compact excellent in corrosion resistance, heat shock resistance, and durability is characterized in that (a) it is an alumina-based sintered compact having an alumina content of 99.5 wt.% or higher, (b) it has a bulk density of 3.7 g/cm<SP>3</SP>or higher, (c) it has an average crystal particle diameter of 20-70 μm, (d) the major diameter/minor diameter of crystal particles on each of one surface of the sintered compact and the surface vertical thereto is 2.0 or higher, and (e) the ratio R1/R2 (wherein R1 is the major diameter/minor diameter on a larger one of the major diameter/minor diameter ratios on the one surface and the surface vertical thereto and the R2 is smaller one of them) is 1.0-2.0. A production method thereof, and a heat treatment member comprising the alumina-based sintered compact are also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT |
