| 简介 |
PROBLEM TO BE SOLVED : To provide an yttrium oxide material with enhanced strength and its manufacturing process.
SOLUTION : The base body 22 for an electrostatic chuck 20 being a member of a semiconductor manufacturing apparatus is composed of an yttrium oxide material containing at least yttrium oxide (Y2O3), silicon carbide (SiC), and a compound containing an RE (rare-earth element), Si, O, and N. The yttrium oxide material contains an RE8Si4N4O14 in which RE is La, Y and the like as the compound containing an RE (rare-earth element), Si, O, and N. The RE8Si4N4O14 is a compound generated from Y2O3, the major ingredient of the raw material, Si3N4 added as a raw material and the like during sintering. This compound and SiC contained in yttrium oxide improves the mechanical strength and the volume resistivity.
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