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Microstructure and Mechanical Properties of In Situ Produced TiC/TiB 2 /MoSi 2 Composites
Author(s) -
Li Jianlin,
Bai Guangzhao,
Jiang Dongliang,
Tan Shouhong
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00279.x
Subject(s) - microstructure , materials science , composite material , composite number , fracture toughness , hot pressing , in situ , flexural strength , toughness , physics , meteorology
A novel microstructure of in situ produced TiC/TiB 2 /MoSi 2 composite and its mechanical properties were investigated. The results indicate that TiC/TiB 2 /MoSi 2 composites can be fabricated by reactive hot pressing the mixed powders of MoSi 2 , B 4 C, and Ti. A novel microstructure consisting of hollow particles of TiC and TiB 2 grains in an MoSi 2 matrix was obtained. Grains of in situ produced TiC and TiB 2 were much finer, from 100 to 400 nm. During the fracture process, hollow particles relieved crack tip stress, encouraging crack branching and changing the original direction of the main crack. The highest bending strength of this composite achieved was 480 MPa, twice that of monolithic MoSi 2 , and the greatest fracture toughness of the composite reached 5.2 MPa·m 1/2 .