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Ceramic joining through reactive wetting of alumina with calcium aluminate refractory cements

Geetha, K and Umarji, AM and Kutty, TRN (2000) Ceramic joining through reactive wetting of alumina with calcium aluminate refractory cements. In: Bulletin of Materials Science, 23 (4). pp. 243-248.

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Abstract

Compositions in CaO-Al2O3 system have been prepared by gel-to- crystallite conversion method. Reactive powders of 1 : 2, 1 : 1, 2: 1 and 3 : 1 of CaO and Al2O3 compositions were obtained by calcining the product at 800-1200 degrees C. Fine grained powders were used as refractory cement for joining alumina ceramics. An optimum temperature of 1450 degrees C for 4 h produced joints of satisfactory strength. The microstructure and X-ray phase analysis of the fractured joint surface clearly indicate reactive wetting of the alumina ceramics. This wetting enhances the joining of alumina substrates and can be attributed to the formation of Ca12Al14O33 liquid phase. The results are explained by using CaO-Al2O3 phase diagram.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Indian Academy of Sciences.
Keywords: reaction bonding;alumina ceramics;calcium aluminate;high temperature cements.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 28 Sep 2004
Last Modified: 19 Sep 2010 04:15
URI: http://eprints.iisc.ernet.in/id/eprint/1701

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