| 摘要 |
PURPOSE:To produce a composite sintered body having high joint strength of a WC-Co sintered hard alloy supporting layer and diamond powder layer by interposing a sheet consisting of a core part of a high melting metal and outside surface part of the carbide, etc., thereof between the two layers. CONSTITUTION:Substantially WC and Co which is a binder are molded or sintered to obtain the sintered hard alloy supporting layer. The prescribed supporting layer and the diamond powder layer are disposed adjacently to each other via the sheet consisting of >=1 kinds among group 4a, 5a, 6a metals of the periodic table interposed therebetween. The sheet is formed to the sectional area of 70-95% of the opposed sectional area of the two layers and is further formed with a compd. layer of at least one kind among C, N and B on the surface to decrease the wettability with molten iron family metals. The entire part thereof is then sintered within the stable region of the diamond and under the pressure and temp. conditions of about >=1,300 deg.C. The composite sintered body which has the diamond layer exhibiting an excellent hardness characteristic and does not generate exfoliation at all between the diamond and sintered hard alloy layers at the time of the heating operation is thereby obtd.
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