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The alumina quality sintering body, the component and the central processing unit which for the central processing unit use this, production mannered null alumina purity of sample treatment manner, and
The alumina quality sintering body, the component and the central processing unit which for the central processing unit use this, production mannered null alumina purity of sample treatment manner, and
PPROBLEM TO BE SOLVED: To solve a problem that the difference of tanδ between the surface layer part and the inside part in an alumina-based sintered compact easily arises and particularly in the thick article, the tanδ is low only in the surface layer and tend to be high in the inside part. PSOLUTION: In the alumina-based sintered compact, the purity of alumina is ≥99.0 mass% and ≤99.7 mass% and the maximum peak intensity of α-alumina crystal phase, measured by X-ray diffraction method, is assigned to (104) plane in the surface layer part and to (116) plane in the inside part at a depth of ≥10 mm from the surface layer part. PCOPYRIGHT: (C)2008,JPO&INPIT
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