Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1984-05-14
1987-01-13
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75241, 75242, 419 13, 419 16, 419 32, 419 33, 419 48, 419 57, 428552, 428570, 428623, 428627, C22C 2904
Patent
active
046362525
ABSTRACT:
A method of manufacturing a cermet having high toughness and high hardness, which exhibits excellent impact resistance and wear resistance when used in cutting tools. A mixed powder is prepared which consists essentially of: titanium nitride, from 25 to 50 percent by weight; titanium carbide, from 10 to 30 percent by weight; at least one selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, from 5 to 25 percent by weight; tungsten carbide, from 10 to 25 percent by weight; and at least one selected from the group consisting of Co and Ni, and Al if required, from 7.5 to 25 percent by weight in total. The above mixed powder is compressed into a green compact. The green compact is sintered in a nitrogen atmosphere under a pressure within a range from 0.1 to 100 torr, and at a temperature within a range from 1400.degree. to 1550.degree. C. In the resulting cermet, the hard disperse phase has a cored structure which is formed by an NaCl-type solid solution phase having a centered structure with titanium carbide at the center surrounded by a solid solution of at least one selected from the group consisting of tantalum carbide, niobium carbide, and zirconium carbide, tungsten carbide, titanium carbide, and titanium nitride, and by a titanium nitride phase.
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Toyama Jhunichi
Yoshimura Hironori
Lechert Jr. Stephen J.
Mitsubishi Kinzoku Kabushiki Kaisha
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