Low thermal expansion zrtio - a1 tio -zro _compositions

Details Low thermal expansion zrtio - a1 tio -zro _compositions Low thermal expansion zrtio - a1 tio -zro _compositions

C - Chemistry, Metallurgy

04

B

261/26, 252/37

C04B 35/46 (2006.01) C04B 35/478 (2006.01) C04B 35/49 (2006.01)

Patent

CA 1294291

Abstract of the Disclosure A low thermal expansion ceramic composition having a predominant Al2TiO5 phase along with zirconium titanate and zirconia phases. The final overall ceramic composition after firing has a low thermal expansion between 24-1000°C of not greater than 1.5x10-6°C-1 and a thermal stability in air such that (a) upon heating to 1200°C for at least 4 hours there is substantially no decomposition of the Al2TiO5 phase to rutile or alumina as measured by X-ray diffraction, (b) physical growth after thermal cycling between 200. and 1150°C for 300 cycles does not exceed 1.5%, and (c) the composition maintains a low average thermal expansion between 24-1000°C of not greater than 1.5x10-6°C-1 after the isothermal heating or cycling conditions. The composition is preferably made by forming a mixture of the equivalent of 50-90 volume percent Al2TiO5 or a solid solution having a substantial amount of Al2TiO5 in the solid solution, and zirconium titanate and then heating the mixture at a temperature of 1250°C or higher.

556799

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