C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
25/142
C04B 35/64 (2006.01) C01F 7/02 (2006.01) C04B 35/113 (2006.01)
Patent
CA 1099497
ABSTRACT OF THE DISCLOSURE Methods of preparing d dense and strong polycrystalline .beta."-alumina- containing ceramic body exhibiting an electrical resistivity for sodium ion conduction at 300°C of 9 ohm-cm or lower obtained directly after sintering and a controlled fine microstructure exhibiting a uniform grain size under 50 micrometers. The invention more particularly relates to methods of uniformly distributing selected metal ions having a valence not greater than 2, e.g. lithium or magnesium, uniformly throughout the beta-type alumina composition to be sintered to form .beta."-alumina. This uniform distribution allows more complete conversion of .beta.-alumina to .beta."-alumina during sintering. As a result, the polycrystalline .beta." - alumina -containing ceramic bodies obtained by the methods of this invention exhibit high density, low porosity high strength, fine grain size (i.e. no grains over 25-50 micrometers with an average size under 5-10 micrometers), low electrical resistivity and a high resistance to degradation by water vapor in an ambient atmosphere. - The invention herein described was made in the course of or under a contract or subcontract thereunder with the National Science Foun- dation.
271827
Cutler Ivan B.
Gordon Ronald S.
Miller Mark L.
Virkar Anil V.
Ford Motor Company
Hewitt Neville S.
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