WC-10%(Co-Ni)超硬合金の基本的諸性質と炭素量との関係

概要

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Investigations were made on some fundamental properties of WC-10%(Co-Ni) alloys affected by the carbon content, i.e., the composition of binder phase in the alloys. Specimens were sintered in vacuum at 1375°C for 1.5 hr. Main results obtained were as follows :<BR>(1) The composition of binder phase in the alloys showed a marked change in the two phase region as in the cases of WC-Co, WC-Ni alloys, etc., i.e., the amount of tungsten dissolved in binder phase increased sharply with decreasing carbon content and increased also with increasing nickel content in binder phase.<BR>(2) Therefore, the properties of the alloys lie between those of WC-Co and WC-Ni alloys, as well as they showed regular changes similar to those in other WC-Co base alloys. It is suggested that the mechanical properties of the alloys containing up to about 10% of nickel in binder are nearly the same as those of WC-Co alloys.<BR>(3) With increasing nickel content, the two phase region of the alloys shifted towards the lower carbon side with the extension of that phase region.<BR>(4) Summerizing, the WC-(Co-Ni) alloys were confirmed to situate between WC-Co and WC-Ni alloys.
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