Stock material or miscellaneous articles – Coated or structually defined flake – particle – cell – strand,... – Particulate matter
Patent
1981-09-04
1983-08-23
Bell, Mark
Stock material or miscellaneous articles
Coated or structually defined flake, particle, cell, strand,...
Particulate matter
423593, 423594, 423595, 423596, 423600, 428446, 428689, 501117, 501120, 501126, 501127, 501132, B32B 516, B32B 904, C01F 500, C01F 702
Patent
active
044004311
ABSTRACT:
Several methods are set forth for preparing polymetallic spinels by coprecipitating two or more metal compounds in a proportion to provide a total of eight positive valences when combined in the oxide form in the spinel crystal lattice. The methods disclosed require coprecipitation of the metals in the hydroxide form or convertible to the hydroxide-oxide form, calcining the coprecipitate, and finally sintering the calcined material at about one-half its melting point or greater, thereby forming a spinel which has a density of greater than 50 percent of the theoretical density of spinel crystal. Also disclosed are techniques for preparing spinels having more than two metals incorporated into the spinel lattice, as well as a separate oxide phase associated with the spinel crystallites, and slipcasting compositions.
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Bratton, R. J., "Initial Sintering Kinetics of MgAl.sub.2 O.sub.4," Journal of The American Ceramic Society, vol. 52, No. 8, 1969, pp. 417-419.
Bratton, R. J., "Coprecipitates Yielding MgAl.sub.2 O.sub.4 Spinel Powders", Ceramic Bulletin, 48, No. 8, pp. 759-762, 1969.
Bratton, R. J., "Characterization and Sintering of Reactive MgAl.sub.2 O.sub.4 Spinel", Ceramic Bulletin, 48, No. 11, pp. 1069-1075, 1969.
Bakker, W. T., "Reactive Magnesia Spinel, Preparation and Properties", Ceramic Bulletin, 46, No. 11, pp. 1094-1097.
Henslee Walter W.
Lindsey John S.
Morrow Stanley J.
Periard John N.
Whitworth Charles R.
Baker G. R.
Bell Mark
The Dow Chemical Company
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