Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1979-03-30
1981-01-13
Arnold, Donald J.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
106 40R, 264 66, C04B 2102
Patent
active
042448980
ABSTRACT:
Porous, rigid separators for electrochemical cells are prepared by first calcining particles of ceramic material at temperatures above about 1200.degree. C. for a sufficient period of time to reduce the sinterability of the particles. A ceramic powder that has not been calcined is blended with the original powder to control the porosity of the completed separator. The ceramic blend is then pressed into a sheet of the desired shape and sintered at a temperature somewhat lower than the calcination temperature. Separator sheets of about 1 to 2.5 mm thickness and 30 to 70% porosity can be prepared by this technique. Ceramics such as yttria, magnesium oxide and magnesium-aluminum oxide have advantageously been used to form separators by this method.
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Bandyopadhyay Gautam
Dusek Joseph T.
Arnold Donald J.
Denny James E.
Glenn Hugh W.
Jackson Frank H.
The United States of America as represented by the United
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