Magnesia partially-stabilized zirconia

Compositions: ceramic – Ceramic compositions – Refractory


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501103, 264 65, C04B 3548




Magnesia partially-stabilized zirconia ceramic materials can be prepared from "unpurified" zirconia which contains at least about 0.05 weight percent silica. Despite the relatively high silica content, a thermal shock resistant material can be produced by a firing schedule which includes heating to a top temperature at a specified rate and cooling back to room temperature at specified rates and which incorporates a thermal aging step at C. Differences in microstructure and monoclinic zirconia content, with consequent differences in physical properties of the ceramic material, can be attained by variations in the firing and thermal-aging schedules.

patent: 2578748 (1951-12-01), Schoenlaub
patent: 2937102 (1960-05-01), Wagner
patent: 3365317 (1968-01-01), Yavorsky
patent: 3887387 (1975-06-01), Sturhahn
patent: 4279655 (1981-07-01), Garvie et al.
patent: 4659680 (1987-04-01), Guile
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L. J. Schioler et al., Effect of Overaging on the Room-Temperature Strength of Partially Stabilized Zirconia, Amer. Ceram. Soc. Bulletin 64, No. 2 (1985), pp. 626-327.
R. T. Pasco et al., "Strengthening and Microstructural Changes in Magnesia Zirconia Alloys", Science of Ceramics, vol. 9, pp. 447-454, 1977.
R. H. J. Hannink et al., "Sub-eutectoid Aged Mg-PSZ Alloy with Enhanced Thermal Up-Shock Resistance", Journal of Materials Science, vol. 17, 1982, pp. 2637-2643.
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Lishing Li et al., "Influence of High Temperature On the Strength of Partially Stabilized ZrO.sub.2 Materials", Ber. Dt. Kerm., vol. 55 (1978), pp. 494-493.
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"Long-Term Stability and Properties of Zirconia Ceramics for Heavy Duty Diesel Engine Components", David C. Larsen and Jane E. Adams, U.S. Department of Energy, Sep. 1985, pp. iii-30, 127-135, 203-219.


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