期刊
CERAMICS INTERNATIONAL
卷 39, 期 8, 页码 9229-9235出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.05.030
关键词
Sol-gel process; Mechanical properties; Sintering temperature; Mu(f)/Mu composites
资金
- National Natural Science Foundation of China [51202291]
- Aid Program for the Innovative Group of National University of Defense Technology
- Aid program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
A new method to weaken the interfacial bonding and increase the strength of 3D mullite fiber reinforced mullite matrix (Mu(f)/Mu) composites is proposed and tested in this paper. Firstly, Mu(f)/Mu composites were fabricated through sol-gel process with varied sintering temperature. Then, the effects of sintering temperature on mechanical properties of the composites were tested. As sintering temperature was raised from 1000 degrees C to 1300 degrees C, the three-point flexural strength of the composites firstly decreased from 66.17 MPa to 41.83 MPa, and then increased to 63.17 MPa. In order to explain the relationship between composite strength and sintering temperature, morphology and structure of the mullite fibers and mullite matrix after the same heat-treatment as in the fabrication conditions of the composites were also investigated. Finally, it is concluded that this strength variation results from the combined effects of matrix densification, interfacial bonding and fiber degradation under different sintering temperatures. Crown Copyright (C) 2013 Published by Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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