Ceramic cutting tool material with improved toughness

Details Ceramic cutting tool material with improved toughness Ceramic cutting tool material with improved toughness

1991-06-28

1992-05-05

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Carbide or oxycarbide containing

501 92, 501127, 51309, C04B 3556

Patent

active

051107708

ABSTRACT:
This invention relates to a cutting tool material with improved toughness behavior using alumina or silicon nitride as the matrix material. The improved toughness is achieved by the addition of whiskers and optionally zirconia in a monoclinic or tetragonal phase, to the matrix. The whiskers are disc-shaped with a thickness of 0.5-8 .mu.m and an equivalent diameter (hypothetical diameter of a circle with the same area as the disc) of about 5-50 .mu.m.

REFERENCES:
patent: 4218253 (1980-08-01), Dworak et al.
patent: 4543345 (1985-09-01), Wei
patent: 4657877 (1987-04-01), Becher et al.
patent: 4745091 (1988-05-01), Landingham
patent: 4789277 (1988-12-01), Rhodes et al.
patent: 4804645 (1989-02-01), Ekstrom
patent: 4849381 (1989-07-01), Brandt et al.
patent: 4920838 (1990-05-01), Brandt et al.

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