Method for treating surface of aluminum material and plasma treating apparatus
First Claim
1. A method for treating a surface of aluminum material made of aluminum, comprising the steps of:
- forming an anodic oxide coating film on the surface of aluminum material by anodic oxidation;
sealing pores formed on said anodic oxide coating film by said anodic oxidation treatment; and
forming a silicon coating film on a surface of said anodic oxide coating film by plasma CVD after said sealing treatment.
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Accused Products
Abstract
An alumite coating film is formed on a surface of an aluminum electrode by anodic oxidation. Pores formed on the alumite coating film are sealed. Thereafter, a silicon nitride film is formed on a surface of the alumite coating film by plasma CVD. In a plasma etching apparatus using the aluminum electrode on which the alumite coating film and the silicon nitride film are sequentially layered, HBr/HCl gas is used as process gas to perform plasma etching of a wafer. An active radical generated from HBr/HCl etches the wafer and attacks the aluminum electrode. Since the aluminum electrode is protected with the silicon nitride film, an aluminum substrate and the alumite coating film are prevented from being etched. Therefore, impurity materials of the aluminum substrate and the alumite coating film are not dispersed into the chamber of the plasma etching apparatus. As a result, the wafer can be prevented from being contaminated by the impurity materials.
85 Citations
12 Claims
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1. A method for treating a surface of aluminum material made of aluminum, comprising the steps of:
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forming an anodic oxide coating film on the surface of aluminum material by anodic oxidation; sealing pores formed on said anodic oxide coating film by said anodic oxidation treatment; and forming a silicon coating film on a surface of said anodic oxide coating film by plasma CVD after said sealing treatment. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A plasma treating apparatus comprising:
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a chamber; a mount electrode provided in said chamber; an opposite electrode provided in said chamber so as to be opposite to said mount electrode; process gas supplying means for supplying process gas to said chamber; and a high-frequency power source for supplying a high frequency to at least one of said mount electrode and said opposite electrode, wherein when at least one of said mount electrode and said opposite electrode is made of aluminum, an anodic oxide film and a silicon coating film are sequentially layered on a surface of said aluminum. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification