Mechanical properties of low temperature synthesized dense and fine-grained Cr2AlC ceramics

Mechanically activated hot-pressing technology was used to synthesise fine-crystalline Cr2AlC ceramics at relatively low temperatures. A mixture of Cr, Al and C powders with a molar ratio of 2:1.2:1 was mechanically alloyed for 3 h, and then subjected to hot pressing at 30 MPa and different temperat...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2011-01, Vol.31 (1-2), p.217-224
Main Authors: Li, S B, Yu, W B, Zhai, H X, Song, G M, Sloof, W G, van, der Zwaag S
Format: Article
Language:English
Subjects:
Aluminum
Ceramics
Chromium
Density
Flexural strength
Grain size
Hot pressing
Vickers hardness
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Summary:Mechanically activated hot-pressing technology was used to synthesise fine-crystalline Cr2AlC ceramics at relatively low temperatures. A mixture of Cr, Al and C powders with a molar ratio of 2:1.2:1 was mechanically alloyed for 3 h, and then subjected to hot pressing at 30 MPa and different temperatures for 1 h in an Ar atmosphere. The results showed that dense Cr2AlC ceramics with a grain size of about 2 micron were synthesised at a relatively low temperature of 1100 C. The synthesised fine-grained Cr2AlC ceramics had a high density of 99%, which was higher than the 95% density for the coarse-grained Cr2AlC ceramics synthesised by hot pressing unmilled Cr, Al and C. The flexural strength, fracture toughness and Vickers hardness of the fine-grained Cr2AlC ceramics were determined and compared with the values for the coarse-grained Cr2AlC ceramics.
ISSN:0955-2219
DOI:10.1016/j.jeurceramsoc.2010.08.014