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Synthesis and oxidation behavior of Al4SiC4 – Al – Si composites

  • Chao Yu , Hongxi Zhu , Wenjie Yuan , Chengji Deng and Shimin Zhou
Published/Copyright: August 11, 2014

Abstract

Al4SiC4 – Al – Si composites were synthesized using a mixture of calcined bauxite, silicon carbide and carbon black as the starting materials. Al4SiC4 began to form at >1 600 °C and Al and Si were identified at 1 800 °C. Al and Si formed only when silicon carbide was in excess of the amount of SiC necessary to form Al4SiC4. The synthesized powders consisted of irregular plate-like crystals and the surfaces were molten-like. The oxidation characteristics of Al4SiC4 – Al – Si composites as antioxidants were better than the oxidation characteristics of pure Al4SiC4, since their action took place mainly at 400 – 700 °C (Al – Si) and above 850 °C (Al4SiC4).


* Correspondence address, Prof. Dr. Chengji Deng, The State Key Laboratory Breeding Base of Refractories and Ceramics, Wuhan University of Science and Technology, NO. 973, Heping Road, Wuhan 430081, P. R. China, Tel: +86-27-68862041, Fax: +86-27-68862085, E-mail:

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Received: 2013-10-14
Accepted: 2014-02-17
Published Online: 2014-08-11
Published in Print: 2014-08-11

© 2014, Carl Hanser Verlag, München

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