| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a cutting tool made of surface coated cemented carbide excellent in chipping resistance and showing excellent cuttability over a long period. SOLUTION: At the time of producing a cutting tool made of surface coated cemented carbide by forming a hard coating layer with 3 to 20μm average layer thickness contg. an Al2 O3 layer on the surface of a WC base cemented carbide substrate using a chemical vapor deposition method and/or a physical vapor deposition method, in the formation of the above Al2 O3 layer, as the reactive gas, an inert reactive gas having a compsn. composed of, by volume, 0.5 to 10% AlCl3 , 1 to 30% sulfur oxide (where y/x>2 in the case of being expressed by the compositional formula of Sx Oy , and the balance inert gas is used.
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