Patent ID: 6645585
Filing Date: 2003-11-11
Classification: B32B,C04B,H01J,Y10S,Y10T

Abstract:
A treatment container for corrosive-gas and/or plasma etching or depositing comprising: a container having a cylindrical body and an introduction tube extended upward from a shoulder portion on an upper side of the cylindrical body, the container comprising a sintered body including more than about 94% by weight of an yttria-alumina compound and zirconia in an amount of 0.05 to 5.0% by weight, wherein the zirconia takes the form of a phase dispersed in the sintered body, and the zirconia phase contains ceria as a stabilizing agent and an inner surface of the cylindrical body having a portion with a roughened surface having a mean roughness Ra of 1.5 to 10 &mgr;m, wherein an inner surface of the introduction tube is a smooth surface having a mean roughness Ra of less than 1.5 &mgr;m.