Abstract
Abstract Dense (TiB 2 +SiC)/Ti 3 SiC 2 composite with 20 vol% TiB 2 and 10 vol% SiC was synthesized by in situ reaction hot pressing. The room and high temperature mechanical and thermal physical properties, as well as thermal shock resistance of the composite were investigated and compared with SiC/Ti 3 SiC 2 composite as prepared by the same process. The synergistic action of TiB 2 and SiC produced a significant strengthening and toughening effect and (TiB 2 +SiC)/Ti 3 SiC 2 composites exhibit superior room- and high-temperature mechanical properties compared with SiC/Ti 3 SiC 2 composite. Especially, (TiB 2 +SiC)/Ti 3 SiC 2 composite shows higher Young's modulus from 25 °C to high temperature and can retain a high modulus of 313 GPa (about 81% of room temperature value) up to 1200 °C. From 25 °C to 800 °C, (TiB 2 +SiC)/Ti 3 SiC 2 composite has higher thermal conductivity and slightly lower coefficient of thermal expansion. Both water quenching test results and calculation of thermal shock resistance parameters, R, R st and R IV indicate an improved thermal shock resistance of (TiB 2 +SiC)/Ti 3 SiC 2 composite, with an increase of the critical thermal shock temperature difference ΔT c from 325 °C for SiC/Ti 3 SiC 2 to 440 °C for (TiB 2 +SiC)/Ti 3 SiC 2 . Superior properties render (TiB 2 +SiC)/Ti 3 SiC 2 composite a promising prospect as high temperature structural materials.
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