Patent ID: 6771483
Filing Date: 2004-08-03
Classification: B23Q,H01L

Abstract:
An electrostatic chuck member comprising a substrate, an undercoat of a metallic sprayed layer formed on at least one surface thereof and having a thickness of 30-300 &mgr;m, a lower insulating layer of Al2O3 ceramic sprayed layer formed by spraying Al2O3 having a purity of not less than 98 wt % on the undercoat and having a thickness of 100-500 &mgr;m and a porosity of 1-8%, an electrode layer of a metallic sprayed layer formed by spraying a metal spraying material having a particle size smaller than a particle size of an insulation spraying material on the lower insulating layer and having an oxygen content of not more than 2.0 wt %, a thickness of 5-100 &mgr;m and a porosity of 1-7%, and an upper insulating layer of Al2O3 ceramic sprayed layer formed by spraying Al2O3 having a purity of not less than 98 wt % on the electrode layer and having a thickness of 100-500 &mgr;m and a porosity of 1-8% and finishing a surface of the upper insulating layer to a surface roughness Ra of about 0.1-2.0 &mgr;m as a topcoat.