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Rapid Consolidation of Nanophase Al2O3 and an Al2O3/Al2TiO5 Composite

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Abstract

A rapid consolidation technique has been utilized in producing single phase AI2O3 in less than 10 minutes at 1400°C resulting in a grain size less than 500 nm. TiO2 has been added in hopes of obtaining Al2O3/Al2TiO5 nanocomposites in sintering times less than 30 minutes. The sintering process involves resistance heating of a graphite die containing the powder at heating rates of about 10 °C/s. The resistance heating step is preceded by a preparatory step consisting of DC voltage pulses applied across a prepressed powder compact. The retention of the nanostructure is attributed to the rapid heating rate although the possible effect of the DC pulses are also discussed. An Al2O3/Al2TiO5 composite has been produced during a short anneal immediately following sintering of an Al2O3/TiO2 nanocomposite. Substantial grain growth has been observed to occur during the transformation taking the composite to the microcrystalline regime.

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Acknowledgement

This work was supported by the ceramics division of National Science Foundation under grant NSF DMR-9314825. The authors wish to thank Professor K. Yamazaki for the use of his laboratory facilities.

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, The University of California, Davis, Davis, CA, 95616, USA

    David A. West, Rajiv S. Mishra & Amiya K. Mukherjee

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  1. David A. West
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  2. Rajiv S. Mishra
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  3. Amiya K. Mukherjee
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West, D.A., Mishra, R.S. & Mukherjee, A.K. Rapid Consolidation of Nanophase Al2O3 and an Al2O3/Al2TiO5 Composite. MRS Online Proceedings Library 457, 347–355 (1996). https://doi.org/10.1557/PROC-457-347

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