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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 13    No. 2    April 2003

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Processing and characteristics of TiB2 toughened 
B-Ti-C composites
LI Dong-bo(李东波), ZHOU Yu(周 玉), GUO Ying-kui(郭英奎)

School of Materials Science and Engineering, 
Harbin Institute of Technology, Harbin 150001, China

Abstract:B-Ti-C composites toughened by TiB2 particles were produced by reaction sintering of B4C, TiC and TiB2 powders. Microstructure and mechanical properties of the composites were studied. A notable improvement on flexure strength and fracture toughness were achieved in B4C composites containing 10%TiB2 and 20%-30%TiC(volume fraction). The highest flexure strength and fracture toughness, 425MPa and 8.2MPa·m1/2, respectively, resulted for B4C-10%TiB2-30%TiC composite, are much higher than those for monolithic B4C. The main toughening mechanism is microcrack toughening and crack deflection toughening. 

 

Key words:  B-Ti-C composites; microstructure; mechanical properties; toughening mechanism

ISSN 1672-7029
CN 43-1423/U

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