PREPARATION OF MULLITE WHISKERS FROM A1F3, SI02, AND A1203 POWDERS
Assignee
US Government
Filed as: UNITED STATES OF AMERICA, THE, AS REPRESENTED BY THE SECRETARY OF THE NAVY
Filed
Feb 8, 1989
Granted
Mar 20, 1990
Location
SILVER SPRING MD US
Abstract
A process for preparing mullite whiskers by (1) forming an anhydrous, intimate, uniform mixture of AlF3, Al2O3, and fused SiO2 powders in an amount selected to produce stoichiometric mullite or a solid solution of Al2O3 in stoichiometric mullite; (2) heating the mixture in anhydrous SiF4 atmosphere at a temperature of from about 700 DEG to about 950 DEG C. to form barlike topaz crystals; (3) heating the barlike topaz in an anhydrous SiF4 atmosphere a a temperature of from about 1150 DEG C. to about 1700 DEG C. to produce the mullite whiskers.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Apr 13, 1989
Rescinded
Jun 28, 1989
Duration
2 months
Inventor
- 1INNA G. TALMY
Record Details
- Patent number
- US 4910172
- Application
- 07307726
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records
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