Compositions: ceramic – Ceramic compositions – Refractory
Patent
1997-05-27
1999-01-26
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501103, C04B 35119
Patent
active
058638504
ABSTRACT:
A zirconia based ceramic material having improved and well-balanced mechanical strength and toughness consists essentially of 0.5 to 50 vol % of Al.sub.2 O.sub.3 having an average grain size of 2 .mu.m or less and the balance of a partially stabilized zirconia having an average grain size of 5 .mu.m or less. The partially stabilized zirconia consists essentially of 8 to 12 mol % of CeO.sub.2, 0.05 to 4 mol % of TiO.sub.2 and the balance of ZrO.sub.2. Fine Al.sub.2 O.sub.3 grains having an average grain size of 1 .mu.m or less are dispersed within the grains of the partially stabilized zirconia at a dispersion ratio. The dispersion ratio is defined as a ratio of the number of Al.sub.2 O.sub.3 grains dispersed within the grains of the partially stabilized zirconia relative to the number of the entire Al.sub.2 O.sub.3 grains dispersed in the ceramic material, and at least 2% in the present invention. The ceramic material can be made by the following process. A first constituent formed of the partially stabilized zirconia is mixed with a second constituent formed of Al.sub.2 O.sub.3 to obtain a mixture. The mixture is molded into a desired shape, and then sintered in the air under an atmospheric pressure to obtain the ceramic material.
REFERENCES:
patent: 4626518 (1986-12-01), Watanabe et al.
patent: 4690911 (1987-09-01), Nakada
patent: 4748138 (1988-05-01), Watanabe et al.
patent: 4753902 (1988-06-01), Ketcham
patent: 4851293 (1989-07-01), Egerton et al.
patent: 5061665 (1991-10-01), Seki et al.
patent: 5130210 (1992-07-01), Iwasaki et al.
patent: 5206192 (1993-04-01), Dransfield et al.
patent: 5525560 (1996-06-01), Yamazaki et al.
Journal of the European Ceramic Society, vol. 10 (1992), pp. 381-392.
German Search Report, no translation.
Levin et al., Phase Diagrams for Ceramists, p. 143.
Radford et al., "Zirconia Electrolyte Cells," J. Mat. Sci., vol. 14, pp. 59-65.
Nakahira Atsushi
Nakamoto Shoichi
Nawa Masahiro
Niihara Koichi
Sekino Tohru
Group Karl
Knoeller William A.
Matsushita Electric & Works Ltd.
LandOfFree
Process of making zirconia based ceramic material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process of making zirconia based ceramic material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process of making zirconia based ceramic material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1450246