期刊
CERAMICS INTERNATIONAL
卷 42, 期 11, 页码 12756-12762出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.04.187
关键词
C-f/ZrC-sic; PyC interphase; Mechanical properties; Ablation properties
资金
- Aid Program for Science and Technology Innovative Research Team in Higher Educational Institutions of Hunan Province
- Aid Program for Innovative Group of National University of Defense Technology
Three-dimensional (3D) C-f/ZrC-SiC composites were successfully prepared by the polymer infiltration and pyrolysis (PIP) process using polycarbosilane (PCS) and a novel ZrC precursor. The effects of PyC interphase of different thicknesses on the mechanical and ablation properties were evaluated. The results indicate that the C-f/ZrC-SiC composites without and with a thin PyC interlayer of 0.15 mu m possess much poor flexural strength and fracture toughness. The flexural strength grows with the increase of PyC layer thickness from 0.3 to 1.2 mu m. However, the strength starts to decrease with the further increase of the PyC coating thickness to 2.2 mu m. The highest flexural strength of 272.3 +/- 29.0 MPa and fracture toughness of 10.4 +/- 0.7 MPa m(1/2) were achieved for the composites with a 1.2 mu m thick PyC coating. Moreover, the use of thicker PyC layer deteriorates the ablation properties of the C-f/ZrC-SiC composites slightly and the ZrO2 scale acts as an anti-ablation component during the testing. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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