| 摘要 |
PROBLEM TO BE SOLVED: To provide a new purification method for forming aα-Al<SB>2</SB>O<SB>3</SB>layer having abrasion resistance and toughness which are substantially more excellent than those of a conventional method. SOLUTION: Theα-Al<SB>2</SB>O<SB>3</SB>layer is formed on a binding phase composed of (Ti, Al) and (C, O, M) in which an aluminum content increases towards an outermost layer. The nucleus generation of theα-Al<SB>2</SB>O<SB>3</SB>is attained when the nucleus generation process includes an aluminide process or an oxidation process. Theα-Al<SB>2</SB>O<SB>3</SB>layer has a thickness of 1-20μm, and includes a columnar particle. The ratio of the length of an alumina particle and the width thereof is 2-12 preferably 5-9. This layer has a clear (012) growing aggregated structure measured using XRD, and almost total existence is characterized by diffraction peaks of (104), (110), (113), and (116). COPYRIGHT: (C)2004,JPO |
