Al2TiO5-ZrTiO4-ZrO2 Composites: A New Family of Low-Thermal-Expansion Ceramics |
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Authors: | Fred J Parker |
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Affiliation: | W. R. Grace and Co.—Conn., Columbia, Maryland 21044 |
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Abstract: | The characterization and properties of ceramic composites containing the phases Al2TiO5, ZrTiO4, and ZrO2 are described. The range of compositions investigated gives very low average thermal expansions (α24–1000°C as low as −2.0 × 10−6°C−1) and excellent high-temperature stability. The low thermal expansions are apparently due to a combination of microcracking by the titanate phases and a contractive phase transformation by the ZrO2. The crystal chemistry and microstructure of the product are processing dependent. Although the composites represent a complex microcracking system, the low thermal expansions and high-temperature stability make them potential candidates for commercial applications requiring thermal shock resistance. |
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Keywords: | thermal expansion composties zirconia solid solutions titanates |
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