Low thermal expansion ZrTiO.sub.4 --Al.sub.2 TiO.sub.5 --ZrO.sub

Details Low thermal expansion ZrTiO.sub.4 --Al.sub.2 TiO.sub.5 --ZrO.sub Low thermal expansion ZrTiO.sub.4 --Al.sub.2 TiO.sub.5 --ZrO.sub

1987-08-07

1988-07-19

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Titanate, zirconate, stannate, niobate, or tantalate or...

501105, 501127, 501153, C04B 3546, C04B 3548, C04B 3549

Patent

active

047585420

ABSTRACT:
A low thermal expansion ceramic composition having a predominant Al.sub.2 TiO.sub.5 phase along with zirconium titanate and zirconia phases. The final overall ceramic composition after firing has a low thermal expansion between 24.degree.-1000.degree. C. of not greater than 1.5.times.10.sup.-6 .degree. C..sup.-1 and a thermal stability in air such that (a) upon heating to 1200.degree. C. for at least 4 hours there is substantially no decomposition of the Al.sub.2 TiO.sub.5 phase to rutile or alumina as measured by X-ray diffraction, (b) physical growth after thermal cycling between 200.degree. and 1150.degree. C. for 300 cycles does not exceed 1.5%, and (c) the composition maintains a low average thermal expansion between 24.degree.-1000.degree. C. of not greater than 1.5.times.10.sup.-6 .degree. C..sup.-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 Al.sub.2 TiO.sub.5 or a solid solution having a substantial amount of Al.sub.2 TiO.sub.5 in the solid solution, and zirconium titanate and then heating the mixture at a temperature of 1250.degree. C. or higher.

REFERENCES:
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Chemical Abstracts, vol. 103, No. 14, p. 264, Abstract No. 108975, Silich, L. M. et al., "Effects of Zirconia on the Formation of Aluminum Titanate".
L. Silich et al., Steklo i Silikaty, vol. 13, pp. 110-114 (1984).
A. McHale et al., J. Am. Ceram. Soc., vol. 69(11), pp. 827-832 (1986).

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