Effect of high temperature oxidation and particle erosion on the performance of C/C-SiC composites materials

Abstract

C/C-SiC composites was prepared by “chemical vapor infiltration + precursor impregnation pyrolysis” (CVI+PIP) combined process by needle preform laying separately with 3K twilled carbon cloth and 12K non-latitude cloth. The long-term oxidation resistance and erosion resistance test of composites were realized by using long-term oxyacetylene ablation test and high- temperature particle erosion test, and the main factors affecting their anti-ablation benavior were studied. The results show that the C/C-SiC composites have certain degree of ablation occurred after 600 s acetylene ablation, the linear ablation rates, mass ablation rates and ablation depth of the material formed by the preform of the non-latitude cloth are lower than that of the material prefabricated with the twilled carbon cloth. Using particles erosion test, the results of the two materials are consistent and the specimen flushing surface presents obvious characteristics of mechanical flushing the the depth of the flushing pit can be reached 7.21-7.25 mm after just 10 seconds. While without the particle airflow flushing test, the degree of material erosion decreased significantly. C/C-SiC composites in the actual use of the process is generally subject to air flow pressure, particle impact and high temperature oxidation of the combined effect, among them the mechanical ablation caused by particle impact has a greater impact on the failure of C/C-SiC composites than thermo-chemical ablation caused by long-term high temperature oxidation, which directly affects the performance of the material.

Keywords

• needle punched c/c-sic
• ablation
• particle erosion
• high temperature oxidation
• failure mechanism