Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1977-05-19
1978-04-04
McCarthy, Helen M.
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
106 45, 106 62, 106 65, 106 734, 252521, 264 66, 423600, 423625, 429193, C04B 3510
Patent
active
040828263
ABSTRACT:
A process for producing a highly ion-conductive porcelain having superior stability, which comprises (a) mixing about 87 to about 95% by weight of Al.sub.2 O.sub.3 with about 5 to about 13% by weight, as Na.sub.2 O, of a sodium salt; (b) heat-treating the mixture at a temperature of not more than about 1500.degree. C in an oxidizing atmosphere to produce a powder whose X-ray powder diffraction pattern has a .beta.-Al.sub.2 O.sub.3 /.beta."-Al.sub.2 O.sub.3 ratio such that the ratio of I.beta.:I.beta." is about 1.0:1 to about 0.25:1 where I.beta. is the peak intensity of .beta.-Al.sub.2 O.sub.3 in the (017) planes with d=2.69 A and I.beta." is the peak intensity of .beta."-Al.sub.2 O.sub.3 in the (01,11) planes with d=2.60A in which d is the lattice distance; (c) mixing 100 parts by weight of the resulting powder obtained in (b) with not more than about 3 parts by weight, as the corresponding oxide, of at least one compound capable of providing a monovalent or divalent metal ion; (d) molding the mixture obtained in (c); and (e) sintering the molding in an alkaline atmosphere.
REFERENCES:
patent: 3895963 (1975-07-01), McGowan et al.
patent: 4013477 (1977-03-01), Jatkar et al.
Ray, A. K. et al., "Synthesis of Sodium B-and B Alumina", Nat. Res. Bull., 10(6), pp. 583-590, June 1975.
Devries, R. C. et al. "Critical Evaluation of the Literature Data on Beta-Alumina and Related Phases-I, Phase Equilibria and Characterization of Beta Alumina Phases", J. Am. Cer. Soc., 52(7), pp. 364-369.
"Research on Electrodes and Electrolyte for the Ford Sodium Sulfur Battery", Ford Motor Co. Research Report of July, 1974 to Nat'l. Science Foundation (NSF Contract-C805), pp. 14-18.
McCarthy Helen M.
NGK Spark Plug Co. Ltd.
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