Journal
CERAMICS INTERNATIONAL
Volume 38, Issue 7, Pages 5723-5730Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2012.04.017
Keywords
Microstructure; Mechanical properties; Reactive melt infiltration; C/C-ZrC composite
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A high performance and low cost C/C-ZrC composite was prepared by chemical vapor infiltration combined with zirconium silicon (Zr: 91.2 at.%; Si: 8.8 at.%) alloyed reactive melt infiltration. The density of the as-received composite is 2.46 g/cm(3) and the open porosity is 5%. Due to the reaction between the pyrolytic carbon and Zr-Si alloy in the composite, ZrC and Zr2Si phases were formed, the formation and distribution of which were investigated by thermodynamics and phase diagram. The as-received C/C-ZrC composite, with the flexural strength of 239.5 MPa, displayed a pseudo-ductile fracture behavior. Ablation properties of the C/C-ZrC composite were tested by a pulse laser. The linear ablation rate was 0.028 mm/s. A ZrO2 barrier layer was formed on the ablation surface and the composite presented excellent ablation resistance. (c) 2012 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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