|
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 |
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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 |
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web of science category |
Nanoscience & Nanotechnology; Materials Science, Multidisciplinary; Metallurgy & Metallurgical Engineering |
|
subject category |
Science & Technology - Other Topics; Materials Science; Metallurgy & Metallurgical Engineering |
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unique article identifier |
WOS:000232565100010
|
