Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 32, Issue 13, Pages 3617-3625Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2012.04.042
Keywords
Tantalum carbides; Spark plasma sintering; Microstructure; Mechanical properties
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Funding
- the Fundamental Research Funds for the Central Universities [HIT. NSRIF 2010111]
- China Postdoctoral Science Foundation [20090450957]
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TaC/SiC composites with 20 vol.% SiC addition were densified by spark plasma sintering at 1600-1900 degrees C for 5 min under 40 MPa. Effects of sintering temperatures on the densification, microstructures and mechanical properties of composites were investigated. The results showed the materials achieved >98% of theoretical density at a temperature as low as 1600 degrees C. While the TaC grains grew slightly with the sintering temperature increasing, the SiC particles in materials decreased in size. Equiaxed to elongated grain morphology transformation was observed in the SiC phase in the 1900 degrees C material to obtain a higher flexural strength and fracture toughness of 715 MPa and 6.7 MPa m(1/2), respectively. Lattice enlargement of the TaC phase in the 1900 degrees C material suggested possible Si diffusion into TaC grains. Ta was also detected in SiC grains by energy dispersive spectroscopy. Glassy pockets present at multi-grain junctions explained the enhanced densification. (c) 2012 Elsevier Ltd. All rights reserved.
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