Silicon nitride sintered product excellent in wear resistance

Details Silicon nitride sintered product excellent in wear resistance Silicon nitride sintered product excellent in wear resistance

1992-12-07

1994-07-05

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501 98, C04B 3558

Patent

active

053267338

ABSTRACT:
A silicon nitride sintered product for use in cutting tools and the like which has silicon nitride as a predominant phase, and comprises 0.1 to 1% by weight of Al as calculated on the basis of Al.sub.2 O.sub.3, the total amount of sintering aid constituents other than Al being 6% by weight or less on the oxide basis, the content of the grain boundary glassy phase being 8% by volume or less. The silicon nitride sintered product preferably has a relative density of 99% or more.

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patent: 4764490 (1988-08-01), Yamakaw et al.
patent: 4769350 (1988-09-01), Nishioka et al.
patent: 4880756 (1989-11-01), Urashima et al.
patent: 5089448 (1992-02-01), Kawakami et al.
Japanese Patent Abstract 83184156, 1983.
Chemical Abstracts, vol. 103, No. 10, Sep. 1985, p. 258, abstract No. 75294c, Columbus, Ohio, US; & JP-A-60 77 174 (Kubota Ltd.) Jan. 5, 1985.
WO-A-8 703 866 (Research Development Co. of Japan et al.) Jul. 1987.
American Ceramic Society Bulletin, vol. 65, No. 9, Sep. 1986, Columbus, Ohio, US, pp. 1311-1315, E. Tani et al., "Gas-pressure sintering of Si3N4 with concurrent addition of A1203 and 5 wt. % rare earth oxide", FIGS. 1-4, Table 1.
Chemical Abstracts, vol. 110, No. 8, Apr. 17, 1989, Columbus, Ohio, US; Abstract No. 140367q, S. Kosaka et al., "High-density silicon nitride sintered ceramics with high temperatures" p. 225; Abstract & JP-A-63 252 967 (Kyocera Corp.), Oct. 20, 1988.

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