Sintered hard alloy and its manufacture

Abstract

Abstract PURPOSE: To cheaply manufacture a sintered hard alloy with superior mechanical toughness and superior heat check resistance by compacting WC crystals and B1- type crystals not contg. Ta and Nb but contg. N together with an Fe group metal as a binder followed by sintering. CONSTITUTION: WC as a hard material and B1-type crystals not contg. expensive Ta and Nb but contg. N in an N to (C+N) molar ratio of 0.1W0.5 are mixed with an Fe group metal such as Co or Ni as a binder for the hard material in the form of powder. This mixture is compacted and sintered in ≤10 -2 W10 -4 Torr vacuum and 0.1W500 Torr an N partial pressure. By adjusting the molar ratio of N/(C+N) to the above-mentioned value, the B1-type crystals are refined, and a sintered hard alloy with superior mechanical toughness and superior heat check resistance can be manufactured cheaply. COPYRIGHT: (C)1981,JPO&Japio

Inventors

• 👤 Kunihiro Takahashi
• 👤 Akio Hara

Bibliographic Details