Aluminum borate fibers
AssigneeAluminum Company of America
InventorChanakya Misra
Life of this patent
Estimating the term…
Abstract
Disclosed is a method of making aluminum borate fibers comprising the steps of preparing an aluminum borate gel by reacting aluminum salt in a solution with ammonium borate and heating the gel to form the aluminum borate fibers.
Claims19
A method of making aluminum borate fibers comprising the steps of:
- (a) preparing an aluminum borate gel by reacting an aluminum salt in a solution with ammonium diborate;
- and
- (b) heating the gel in a water vapor atmosphere at a temperature within the range of 350.degree. to 500.degree. C. to form aluminum borate fibers.
The method of making aluminum borate single crystal fibers having a length in the range of 20 to 2000 microns and a diameter of 1 to 10 microns and having a composition xA1.sub.2 O.sub.3.yB.sub.2 O.sub.3 where x is in the range of 4 to 9 and y is in the range of 2 to 5, the method comprising the steps of preparing an aluminum borate gel by reacting an aluminum salt selected from aluminum sulfate, aluminum nitrate and aluminum chloride in solution with ammonium diborate, the reaction carried out at a temperature in the range of 20.degree. to 100.degree. C. and the aluminum salt being present in the solution in the range of 5 to 25 wt. % and the ammonium diborate being present in solution in the range of 5 to 25 wt. %, heating the gel to a temperature in the range of 350.degree. to 500.degree. C. at a pressure in the range of 2,000 to 10,000 psig to form aluminum borate fibers.
Dependencies are inferred from the claim text.