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Effect of short milling time and microwave heating on phase evolution, microstructure and mechanical properties of alumina–mullite–zirconia composites

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Published/Copyright: December 11, 2015

Abstract

Alumina–mullite–zirconia composites were prepared using alumina and zircon powders pressed uniaxially at 250 MPa and sintered in a microwave furnace held at 1 550 °C for 90 min. The effects of short milling and sintering time on the density, phase evaluation and mechanical strength of the sintered composites were analyzed and compared with composites sintered in a conventional furnace. The goal was to decrease sintering time and temperature over that for conventional heating. The results showed that, although the densities were similar for both methods, the hardness, mechanical strength and fraction of the tetragonal zirconia phase of the microwave-sintered composites were much higher. The milling time yielded better densification and higher mechanical properties. It was found that the shorter sintering time in a microwave furnace requires longer milling time of the powders to obtain the same composite properties.


*Correspondence address, Dr. Hudsa Majidian, Ceramic Department, Materials and Energy Research Center, Meshkin dasht, Karaj 14155-4777, Iran, Tel.: +98 9125177988, Fax: +98 2636201888, E-mail:

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Received: 2015-05-10
Accepted: 2015-08-24
Published Online: 2015-12-11
Published in Print: 2015-12-08

© 2015, Carl Hanser Verlag, München

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