Effect of tungsten carbide additions on the microstructure and properties of hot-pressed alumina
authors Acchar, W; Cairos, CA; Segadaes, AM
nationality International
journal MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
author keywords alumina; tungsten carbide; hot-pressing; mechanical properties; microstructure
keywords MECHANICAL-PROPERTIES; SINTERING BEHAVIOR; COMPOSITES; CERAMICS
abstract Studies published in the literature have shown that alumina reinforced with refractory carbides is a good alternative to cemented carbides, for cutting tools and wear-resistant applications. In this work, alumina reinforced with tungsten carbide was homogenised and mixed in a planetary ball mill and subsequently hot-pressed at 1450 degrees C under 20 MPa in flowing argon. Hot-pressing resulted in a material with a hardness and fracture toughness of 19 GPa and 7.1 MPa m(1/2), respectively. X-ray diffraction analysis showed the presence of alumina and WC. No other new crystalline phase was identified. The sintered material showed a very homogeneous distribution of small dark grains of WC in an alumina matrix, which appears to have very large grains with very clean grain boundaries. The WC grains tend to lie on grain boundaries but can also be seen at triple points. The material also shows large alumina grains containing WC inclusions, which points to the possible occurrence of abnormal grain growth. (c) 2005 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE SA
issn 0921-5093
year published 2005
volume 406
issue 1-2
beginning page 74
ending page 77
digital object identifier (doi) 10.1016/j.msea.2005.06.020
web of science category Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering
subject category Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering
unique article identifier WOS:000232565100010
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journal impact factor 4.652
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