Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1984-04-17
1985-10-15
McCarthy, Helen M.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
264 61, 501 93, 501 97, 501 98, C04B 3556, C04B 3558
Patent
active
045474702
ABSTRACT:
Sialon-base ceramic materials having both high hardness and good sinterability and can show excellent wear resistance when used in cutting tools and other wear-resisting tools. A Sialon-base ceramic material according to the invention has main components consisting of .beta.-Sialon expressed by a chemical formula Si.sub.6-z Al.sub.z O.sub.z N.sub.8-z, z being larger than 0 but not more than 4.3, and .alpha.-Sialon expressed by a chemical formula M.sub.x (Si, Al).sub.12 (O,N).sub.16, x being larger than 0 but not more than 2, M representing at least one selected from the group consisting of Li, Na, Ca, Mg, Y, and any rare earth element, the ratio of the .alpha.-Sialon/the .beta.-Sialon being within a range from 25/75 to 95/5 in volume. The Sialon-base ceramic material further includes as a disperse phase-forming component 1-40 percent by volume at least one selected from the group consisting of carbide of Ti, Zr, or Hf, nitride thereof, carbo-nitride thereof, and carbo-oxi-nitride thereof, and as a combined phase-forming component 1-20 percent by volume at least one selected from the group consisting of oxide of any of the above M-forming elements, the above disperse phase-forming metallic elements, Si, or Al, and nitride thereof. Part of the above disperse phase-forming component (S1) may be substituted by at least one (S2) selected from the group consisting of carbide of V, Nb, Ta, or Cr, nitride thereof, carbo-nitride thereof, carbo-oxi-nitride thereof, and carbide of Mo or W, the ratio S2/(S1+S2) being within a range from 0.01 to 0.5 in volume.
REFERENCES:
patent: 3969125 (1976-07-01), Komeya et al.
patent: 4127416 (1978-11-01), Lumby et al.
patent: 4252768 (1981-02-01), Perkins et al.
patent: 4323323 (1982-04-01), Lumby et al.
patent: 4424066 (1984-01-01), Sarin et al.
patent: 4426209 (1984-01-01), Sarin et al.
patent: 4506020 (1985-03-01), Butler et al
Grand, G. et al.-"Composition and Stability of Y--Si--Al--O--N Solid Solutions Based on .alpha.-Si.sub.3 N.sub.4 Structure"-J. Materials Science, 14 (1979)-Letters-pp. 1749-1751.
Mitomo, M. et al.-"The Strength of .alpha.-Sialon Ceramics", J. Materials Science, 15 (1980) pp. 2661-2662.
Jack, K. H.-"The Significance of Structure and Phase Equilibria in the Development of Silicon Nitride and Sialom Ceramics"-Science of Ceramics, vol. 11 (pub'd by Swedish Ceramic Soc.) (1981) pp. 125, 140-141.
Ajima Tatsuro
Nishigaki Kenichi
Tanase Teruyoshi
McCarthy Helen M.
Mitsubishi Kinzoku Kabushiki Kaisha
LandOfFree
Sialon-base ceramic materials excellent in wear resistance does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sialon-base ceramic materials excellent in wear resistance, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sialon-base ceramic materials excellent in wear resistance will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2431696