2016-08-242016-08-241995-04-18http://hdl.handle.net/10919/72832.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.application/pdfen-USPatenthttp://pimg-fpiw.uspto.gov/fdd/79/074/054/0.pdf8098202106/287.19501/12516/77516/90516/93516/98C01G23/003C01P2006/22C01P2006/32C04B41/87C04B35/478C04B35/6264C04B41/009C04B41/5041C04B41/4537C04B41/4554C04B41/463C04B41/5016C04B35/565C04B35/584C04B38/00C04B2235/3206C04B2235/441C04B2235/443C04B2235/656C04B2235/6562C04B2111/00112C23C18/1216C23C18/1254C23C18/1283C23C18/12955407479