| 摘要 |
A sintered hard alloy, having excellent mechanical strength and toughness, comprises 40 to 95 % by weight of a hard phase composed of multiple borides containing at least 10 % by weight of Fe, and a binder phase for binding said hard phase, wherein the B content is 3 to 8%, the Cr content is up to 35 % by weight, the Ni content is up to 35 % by weight, the Al content is up to 2.85% by weight, the Si content is 0.03 to 4.75 % by weight, the C content is up to 0.95 % by weight, the 0 content us up to 2.3 % by weight, the content of Mo and/or W is such that the (Mo and/or W)/B atomic ratio is in the range of from 0.75 to 1.25 and the balance consists of Fe and unavoidable impurities. |
