Alumina-rare earth oxide ceramic-metal bodies

Details Alumina-rare earth oxide ceramic-metal bodies Alumina-rare earth oxide ceramic-metal bodies

1992-08-17

1995-10-24

Walsh, Donald P.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75235, 75237, 75238, 75245, 75249, 75951, 419 10, 419 11, 419 12, 419 13, 419 14, 419 15, 419 16, 419 19, 419 20, 419 23, 419 24, 419 36, 419 38, 419 42, 419 48, 419 49, 82 111, 407119, C22C 2902, C22C 2912, C22C 2918, B31B 100, B23B 100

Patent

active

054606403

ABSTRACT:
A fully dense ceramic-metal body including 40-88 v/o of an oxide hard phase of, in v/o of the body, 4-88 v/o M-aluminum binary oxides, where the binary oxide has a C-type rare earth, garnet, .beta.-MAl.sub.11 O.sub.18, or perovskite crystal structure, and M is a lanthanide or indium, and 0-79 v/o .alpha.-alumina; about 10-50 v/o of a hard refractory carbide, nitride, or boride as a reinforcing phase; and about 2-10 v/o of a dispersed metal phase combining Ni and Al mostly segregated at triple points of the microstructure. The preferred metal phase contains a substantial amount of the Ni.sub.3 Al ordered crystal structure. In the preferred body, the reinforcing phase is silicon carbide partially incorporated into the oxide grains, and bridges the grain boundaries. The body including a segregated metal phase is produced by densifying a mixture of the hard phase components and the metal component, with the metal component being present in the starting formulation as Ni powder and Al powder. The body may be used as a cutting tool for machining nickel superalloys or cast iron at speeds up to about 1000 sfm, feed rates up to about 0.012 in/rev, and depth of cut up to about 0.10 inches.

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