Electrostatic chuck member and method of producing the same
First Claim
Patent Images
1. 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 μ
- 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 μ
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 μ
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 μ
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 μ
m as a topcoat.
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Abstract
It is to provide an electrostatic chuck member having a strong adsorption force and an excellent responsibility (release property) in the stop of voltage application and is an electrostatic chuck member comprising a substrate, an undercoat of a metallic layer formed on at least one surface thereof, a lower insulating layer of Al2O3 ceramic formed on the undercoat, a metallic electrode layer formed on the lower insulating layer and an upper insulating layer of Al2O3 ceramic formed on the electrode layer as a topcoat.
56 Citations
10 Claims
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1. 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 μ
- 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 μ
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 μ
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 μ
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 μ
m as a topcoat. - View Dependent Claims (2, 3, 4, 5)
- 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 μ
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6. A method of producing an electrostatic chuck member which comprises subjecting at least one surface of a substrate to a blast treatment, spraying a metal or an alloy onto a roughened surface of the substrate to form an undercoat of a metallic layer having a thickness of 30-300 μ
- m, forming a lower insulating layer made of Al2O3 ceramic sprayed layer having a thickness of 100-500 μ
m, a porosity of 1-8% and a purity of not less than 98 wt % on the undercoat, spraying a metallic spraying material having a particle size smaller than a particle size of spraying material for insulating layer on the lower insulating layer to form a metallic electrode layer having a thickness of 5-100 μ
m, an oxygen content of not more than 2.0 wt % and a porosity of 1-7%, forming an upper insulating layer made of Al2O3 ceramic sprayed layer having a thickness of 100-500 μ
m, a porosity of 1-8% and a purity of not less than 98 wt % on the metallic electrode layer, subjecting a surface of the upper insulating layer to a mechanical polishing to finish to a surface roughness Ra of about 0.1-2.0 μ
m, and laminating these layers in this order. - View Dependent Claims (7, 8, 9, 10)
- m, forming a lower insulating layer made of Al2O3 ceramic sprayed layer having a thickness of 100-500 μ
Specification