Sintered alloy for cutting tools
AssigneeNgk Spark Plug Co., Ltd.
InventorsHiroshi Tanaka, Osamu Kato
Life of this patent
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Abstract
A sintered alloy for cutting tools comprising 60 to 90% by weight of a carbide comprising Mo.sub.2 C, WC and TiC in the proportions shown by the tetragonal region surrounded by points A, B, C and D in the ternary composition diagram of FIG. 1, the proportion of the sum of WC and Mo.sub.2 C with a WC/Mo.sub.2 C weight ratio of 35:65 to 65:35 being 50 to 75% by weight, and the proportion of TiC being 25 to 50% by weight, 3 to 20% by weight of a nitride selected from the group consisting of TiN, TaN or a mixture of TiN and TaN, and 5 to 20% by weight of Ni, Co or a mixture of Ni and Co as a binder metal, And further comprising a solid solution phase of the carbide and nitride with a grain size of not more than 1.3 .mu. and a binder metal phase.
Claims1
A sintered alloy for cutting tools consisting essentially of 60 to 92% by weight of a carbide comprising Mo.sub.2 C, WC and TiC in the proportions shown by the tetragonal region A, B, C and D in the ternary composition diagram of FIG. 1, the proportion of the sum of WC and Mo.sub.2 C with a WC/Mo.sub.2 C weight ratio of 35:65 to 65:35 being 50 to 75% by weight, and the proportion of TiC being 25 to 50% by weight;
- 3 to 20% by weight of a nitride selected from the group consisting of TiN, TaN or a mixture of TiN and TaN;
- and
- 5 to 20% by weight of Ni, Co or a mixture of Ni and Co as a binder metal;
- and wherein the carbide and nitride are in the form of a solid solution phase nitride with a grain size of not more than 1.3 .mu. and a binder metal phase.
Dependencies are inferred from the claim text.