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Microwave Technique: A Powerful Tool for Sintering Ceramic Materials

Author(s): A. Borrell, M. D. Salvador, M. Miranda, F. L. Penaranda-Foix, J. M. Catala-Civera.

Abstract:

Microwave sintering has emerged in recent years as a promising technology for faster, cheaper and eco-friendlier processing of a wide variety of materials, which are regarded as significant advantages against conventional sintering procedures. The present investigation describes a technique for sintering two different ceramic materials by microwave heating: alumina-15vol.% zirconia and hydroxyapatite nanopowders. The results show that microwave sintering achieves higher density values, excellent mechanical properties and a homogeneous microstructure at lower sintering temperatures. The densities of microwave processed samples were close to the theoretical densities, and the near-net-shape of the green body was preserved without significant dimensional changes. The main advantages of microwave heating can be summarized as follows: a more flexible process, reduced processing times and production costs, and environmental benefits. Thus, microwaves are a clear alternative to conventional heating methods, using up to 70% less energy throughout the whole sintering process.

Keywords: Biomaterials, ceramics, grain size, microwave sintering, microstructure, mechanical properties.

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Article Details

VOLUME: 10
ISSUE: 1
Year: 2014
Page: [32 - 35]
Pages: 4
DOI: 10.2174/1573413709666131111225053