Synthesis and microstructure of Ti3AlC2 by mechanically activated sintering of elemental powders

The mechanically activated sintering process was adopted to synthesise Ti3AlC2 by using Ti, Al and graphite elemental powders. These were subjected to mechanical alloying with charge ratios (CR) of 20:1 and 50:1, respectively. Fine powders containing TiC, Ti3AlC2 and Al3Ti were obtained after millin...

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Bibliographic Details
Published in:Ceramics international 2007-03, Vol.33 (2), p.169-173
Main Authors: LI, Shi-Bo, ZHAI, Hong-Xiang, BEI, Guo-Ping, YANG ZHOU, ZHANG, Zhi-Li
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
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Summary:The mechanically activated sintering process was adopted to synthesise Ti3AlC2 by using Ti, Al and graphite elemental powders. These were subjected to mechanical alloying with charge ratios (CR) of 20:1 and 50:1, respectively. Fine powders containing TiC, Ti3AlC2 and Al3Ti were obtained after milling for 4 h with a CR of 20:1, and for 1.5 h with a CR of 50:1. The mechanical alloyed powders were pressureless sintered at different temperatures. Ti3AlC2 started to form at 1250 C and its content increased at 1350 C. However, it decomposed to TiC at 1450 C. The microstructure of sintered samples showed that many Ti3AlC2 grains were delaminated and broken. Some severely delaminated Ti3AlC2 grains in which kink bands developed were also found. 14 refs.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2005.07.024