Compositions: ceramic – Ceramic compositions – Refractory
Patent
1991-11-19
1992-12-29
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501105, 501119, 501120, 501127, 501128, C04B 3548
Patent
active
051751321
ABSTRACT:
Hard crystalline sintered ceramic products, and a method for making them at substantially reduced sintering temperatures, are disclosed, the products being manufactured by the sintering of mixtures comprising one or more ceramic powders selected from among zirconia, stabilized zirconia, partially stabilized zirconia, alumina, mullite, cordierite, and MgAl.sub.2 O.sub.4 spinal together with a combination sintering aide including TiO.sub.2 and at least one transition metal oxide selected from the group consisting of copper oxide, manganese oxide, cobalt oxide and zinc oxide, the mixture comprising at least about 3.5 mole percent TiO.sub.2, at least about 1.3 percent of transition metal oxides, about 4.8-50 mole percent total of TiO.sub.2 +transition metal oxides, and the remainder ceramic powder. Sintering of these mixtures at temperatures typically 200.degree.-350.degree. C. below the pure powder sintering temperatures of the base ceramics provides products with open porosities less than 5% by volume, more typically 0-2% by volume.
REFERENCES:
patent: 3607323 (1971-09-01), Tedmon, Jr.
patent: 3887387 (1975-06-01), Sturhahn
patent: 4719188 (1988-01-01), Koba et al.
patent: 4742030 (1988-05-01), Masaki et al.
patent: 4753902 (1988-06-01), Ketcham
patent: 5004711 (1991-04-01), Grodek
patent: 5055433 (1991-10-01), Niwa et al.
I. B. Cutler et al., "Sintering Alumina at Temperatures of 1400#C and Below", J. Am. Ceram. Soc., 40 (4), pp. 134-139 (1957).
W. R. Cannon, "High Creep Ductility in Alumina-Containing Compensating Additives", Advances in Ceramics, vol. 10, Structure and Properties of MgO and Al.sub.2 O.sub.3, pp. 741-749, Am. Ceram. Soc., (1984).
M. Kimura, "Preparation of Low-Y.sub.2 O.sub.3 -TZP by Low Temperature Sintering", Science and Technology of Zirconia, III, pp. 183-191, Am. Ceram. Soc. (1988).
C-M. J. Hwang et al., "Effect of A Liquid Phase on Super Plasticity of 2% Mol-Y.sub.2 O.sub.3 -Stabilized Tetragonal Zirconia Polycrystals" J. Am. Ceram. Soc., 73 (6), pp. 1626-1632 (1990).
I-Wei Chen et al., in "Development of Super-Plastic Structural Ceramics", J. Am. Ceram. Soc., 73 (9), pp. 2585-2609 (1990).
I-Wei-Chen, U.S. AFOSR Report No. AD-A200-202 (Aug. 25, 1988).
L. A. Xue et al., "Low-Temperature Sintering of Alumina with Liquid-Forming Additives", J. Am. Cer. Soc. 74 [8] 2011-2013 (1991).
Ketcham Thomas D.
Share Leroy S.
Bell Mark L.
Marcantoni Paul
VAN DER Sterre Kees
LandOfFree
Sinterable ceramic compositions does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sinterable ceramic compositions, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sinterable ceramic compositions will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1886940