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Invention Application
WO2023042777A1 被覆超微粒超硬合金，およびこれを用いた切削工具または耐摩耗部材 审中-公开

被覆超微粒超硬合金，およびこれを用いた切削工具または耐摩耗部材
Abstract:
耐摩耗性に優れた工具等を提供する。被覆超微粒超硬合金製ドリル１は，平均粒径が１．０μｍ以下であるＷＣを主成分とする硬質相を超微粒超硬合金全体に対して７０～９９．４ｗｔ％含み，Ｔｉの酸化物を焼結中に炭窒化させて生成されるＴｉ（Ｃ，Ｎ）を主成分とする粒成長抑制相を超微粒超硬合金全体に対して０．１～３０ｗｔ％含み，Ｃｏ，ＮｉおよびＦｅからなる群より選択される少なくとも１種類を主成分とする結合相を超微粒超硬合金全体に対して０．４～３０ｗｔ％含み，上記硬質相と粒成長抑制相と結合相との合計が１００ｗｔ％である超微粒超硬合金に硬質被膜がＰＶＤまたはＣＶＤによって被覆されたものである。
Abstract(English):

Provided are a tool and the like excellent in abrasion resistance. A coated ultrafine grain cemented carbide drill 1 is produced by coating an ultrafine grain cemented carbide with a hard coating film by means of PVD or CVD, said coated ultrafine grain cemented carbide containing 70 to 99.4 wt% of hard phase, which is composed mainly of WC having an average grain size of 1.0 µm or less, relative to the total ultrafine grain cemented carbide, 0.1 to 30 wt% of grain growth inhibition phase, which is composed mainly of Ti (C, N) produced by carbonitriding of Ti oxides during sintering, relative to the total ultrafine grain cemented carbide, and 0.4 to 30 wt% of binder phase, which is composed mainly of at least one kind selected from the group consisting of Co, Ni, and Fe, relative to the total ultrafine grain cemented carbide, with the total of the hard phase, the grain growth inhibition phase, and the binder phase being 100 wt%.

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