Synthesis of Ti3SiC2 by pressureless sintering of the elemental powders in vacuum

Green compacts fabricated from Ti, Si and C powders with molar ratio of 3:1:2 were pressureless sintered at 1340DGC to 1750DGC for 20-180 min in vacuum. X-ray diffraction (XRD) was applied to determine the phase compositions of the products. It was found that Ti3SiC2 was obtained in most cases. TiC...

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Bibliographic Details
Published in:Materials letters 2004-04, Vol.58 (11), p.1741-1744
Main Authors: Li, H., Chen, D., Zhou, J., Zhao, J.H., He, L.H.
Format: Article
Language:English
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Summary:Green compacts fabricated from Ti, Si and C powders with molar ratio of 3:1:2 were pressureless sintered at 1340DGC to 1750DGC for 20-180 min in vacuum. X-ray diffraction (XRD) was applied to determine the phase compositions of the products. It was found that Ti3SiC2 was obtained in most cases. TiC is the most common impurity, while TiSi2 and Ti5Si3 will occur, respectively, if the compacts are sintered at excessively high or low temperatures. Besides the reaction thermodynamics and kinetics, loss of Si and contamination of C may be the most important reasons for the appearance of the impurities. Sintering at 1450DGC for 120 min yields samples containing 81 vol.% Ti3SiC2. The purity of Ti3SiC2 in the products is hopefully increased if the molar ratio of the elemental powders were optimized.
ISSN:0167-577X
DOI:10.1016/j.matlet.2003.10.057