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US 4,392,988 AGranted
Method of producing stable alumina
AssigneeGA Technologies Inc.
InventorsJesse C. Dobson, Richard W. Knight, Jr.
Life of this patent
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Abstract
Microspheres of activated alumina are thermally and chemically stabilized by soaking the spheres in silicone liquid and decomposing the silicone liquid in an inert atmosphere to leave a silica residue infused in the alumina crystal structure resulting in a silica-alumina phase over the internal and external structure of the alumina. The treated microspheres are then heated in the presence of oxygen to burn off residual carbon resulting from the decomposition of the silicone liquid.
Claims10
A method of treating activated alumina to impart increased chemical stability and heat resistance thereto comprising
- soaking activated alumina in silicone liquid to impregnate said activated alumina therewith,
- draining excess silicone liquid from said activated alumina, and
- heating said silicone liquid impregnated activated alumina in an oxygen-free atmosphere to between about 350.degree. C. and about 1100.degree. C. to leave a silica residue infused in the crystallite structure resulting in a silica-alumina phase over the internal and external structure of said alumina.
Dependencies are inferred from the claim text.