Sintered cermets for tool and wear applications

Details Sintered cermets for tool and wear applications Sintered cermets for tool and wear applications

1976-05-11

1977-05-10

Hunt, Brooks H.

Metal fusion bonding

Process

Metal to nonmetal with separate metallic filler

75202, 75203, 75206, 51309A, 106 7333, 106 734, 228170, 428545, 75234, B22F 300, C22C 2900

Patent

active

040225844

ABSTRACT:
A composition of material comprising aluminum oxide and refractory transition metal diborides, with additions of magnesium oxide and, optionally, transition metal carbides, nitrides, carbonitrides and iron group metals for sintering and grain morphology control, is disclosed, which is particularly useful as a cutting tool for steels, cast iron, and hard to machine materials, such as superalloys. In contrast to the TiC-Al.sub.2 O.sub.3 cermets of the prior art which have to be hot pressed for optimum properties, a large portion of the cermets of the invention can also be fabricated, without detriment to performance, by sintering the cold pressed powder compacts in an inert furnace atmosphere at temperatures between 1650.degree. and 1820.degree. C.

REFERENCES:
patent: 3457051 (1969-07-01), Bergna
patent: 3940276 (1976-02-01), Wilson
patent: 3953221 (1976-04-01), Lange

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