Large-Bulk Solidified Al2O3-ZrO2(Y2O3) Prepared by Self-Pressure Assisting Combustion Synthesis under High Gravity

Abstract:

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By introducing self-pressure processing into combustion synthesis under high gravity, Al2O3-ZrO2(4Y) eutectic composite ceramics without shrinkage cavities and holes were achieved, and the self-pressure processing also made the macro-crack be controlled and the ceramic densification be promoted evidently. XRD results showed the eutectic ceramics were composed of α-Al2O3, t-ZrO2 and a few m-ZrO2 phases, and the volume fraction of the transformable t-ZrO2 increased with self-pressure force increasing. SEM images showed that with increasing self-pressure force, the rod-shaped eutectic colonies were refined and the volume fraction of the colonies increased. Meanwhile, the irregular ZrO2 crystals around eutectic colonies transformed to be fine t-ZrO2 spherical crystals gradually, and thickness of eutectic colonies decreased. With the changes in microstructures of the ceramics, the mechanical properties of the ceramics were improved greatly.

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Periodical:

Edited by:

Yiwang Bao, Li Tian and Jianghong Gong

Pages:

394-397

DOI:

10.4028/www.scientific.net/AMR.177.394

Citation:

G. L. Su et al., "Large-Bulk Solidified Al2O3-ZrO2(Y2O3) Prepared by Self-Pressure Assisting Combustion Synthesis under High Gravity", Advanced Materials Research, Vol. 177, pp. 394-397, 2011

Online since:

December 2010

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$35.00

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