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Composition and process for making an insulating refractory material

United States Patent

5,744,412
April 28, 1998
View the Complete Patent at the US Patent & Trademark Office
A composition and process for making an insulating refractory material. The composition includes calcined alumina powder, flash activated alumina powder, an organic polymeric binder and a liquid vehicle which is preferably water. Starch or modified starch may also be added. A preferred insulating refractory material made with the composition has a density of about 2.4-2.6 g/cm.sup.3 with reduced thermal conductivity, compared with tabular alumina. Of importance, the formulation has good abrasion resistance and crush strength during intermediate processing (commercial sintering) to attain full strength and refractoriness, good abrasion resistance and crush strength.
Pearson; Alan (Murrysville, PA), Swansiger; Thomas G. (Apollo, PA)
Aluminum Company of America (Pitsburgh, PA)
08/ 644,440
May 13, 1996
ORIGIN OF THE INVENTION The invention described herein was made in the performance of Contract No. DE-FC07-89ID 12903 awarded by the U.S. Department of Energy and may be manufactured and used for governmental purposes without payment of any royalties therefor.