Sol-gel .beta.-aluminum titanate thin film coating

Publication Date
1995-04-18Filing Date
1993-07-28Inventor
Brown, Nancy R.
Brown, Jr., Jesse J.
Sun, Tawei
Metadata
Show full item recordAbstract
.beta.-Al.sub.2 TiO.sub.5 protective coatings have been developed for both dense and porous ceramics such as SiC and Si.sub.3 N.sub.4 using a chemical solution processing method involving the hydrolysis and condensation of aluminum tri-sec butoxide and titanium butoxide. The solution viscosities, pH values, H.sub.2 O/alkoxide molar ratios, and dip coating withdrawal rates required for crack-free .beta.-Al.sub.2 TiO.sub.5 are 1.0 to 6.2 cP, pH 1-4.5, molar ratio 1.5-10, and withdrawal rate of 2.2-8.0 cm/min, respectively. Conversion of the amorphous coating to crystalline .beta.-Al.sub.2 TiO.sub.5 is achieved by a succession of calcination below 450.degree. C. and a final heat-treatment at 1300.degree. C. for ten hours with controlled heating and cooling rates.
Assignee
Center for Innovative Technology
Virginia Polytechnic Institute and State University
Patent Number
5407479
Application Number
8098202
Primary/U.S. Class
106/287.19
Other/U.S. Class
501/12
516/77
516/90
516/93
516/98
CPC Class
C01G23/003
C01P2006/22
C01P2006/32
C04B41/87
C04B35/478
C04B35/6264
C04B41/009
C04B41/5041
C04B41/4537
C04B41/4554
C04B41/463
C04B41/5016
C04B35/565
C04B35/584
C04B38/00
C04B2235/3206
C04B2235/441
C04B2235/443
C04B2235/656
C04B2235/6562
C04B2111/00112
C23C18/1216
C23C18/1254
C23C18/1283
C23C18/1295
Patent Type
utility
Collections
- Virginia Tech Patents [546]