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EFFECT OF CARBON NANOTUBES ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF W |
TAN Jun, ZHOU Zhangjian, LIU Yaqin, QU Dandan, ZHONG Ming, GE Changchun |
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083 |
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Cite this article:
TAN Jun ZHOU Zhangjian LIU Yaqin QU Dandan ZHONG Ming GE Changchun. EFFECT OF CARBON NANOTUBES ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF W. Acta Metall Sin, 2011, 47(12): 1555-1560.
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Abstract W–based composites were fabricated by spark plasma sintering (SPS) usingWpowders and carbon nanotubes (CNTs) as raw materials. The effect of the CNTs on the microstructure and room temperature mechanical properties of W was investigated. The results show that the W2C was formed through the reaction of CNTs and W during the SPS process. The formation of the W2C activated the sintering of W and enhanced the densification of W. On the other hand, the in situ formation of W2C decreased the driving force of sintering and consequently inhibited the grain growth of W at high temperature. The grain size, relative density, bending strength and the Vicker’s hardness of W composites were 4 μm, 99%, 1353.9 MPa and 488.4 HV respectively when the content of CNTs was 0.5%.
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Received: 28 June 2011
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Fund: Supported by National Natural Science Foundation of China (No.50634060) and National Magnetic Confinement Fusion Program (No.2010GB109000) |
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