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Cf/AZ91 composite was fabricated by liquid-solid extrusion following vacuum pressure infiltration technique (LSEVI). There were some inevitable shortcomings, such as interfacial mismatch stress, in spite of the advantages of LSEVI. Heat treatment was conducted to modify the composite. It was confirmed that the interface and mechanical properties of the Cf/AZ91 composite could be modified by heat treatment...
The oxidation behavior of C/C-ZrC composites prepared by chemical liquid-vapor infiltration (CLVI) process was studied, and the effects of co-deposited ZrC on the oxidation resistance properties were also discussed. Results indicate that an excellent oxidation resistance of C/C-ZrC composites has been obtained due to introduction of co-deposited ZrC. After 240 min oxidation at 900 °C, the mass loss...
In order to investigate the ablation behavior and mechanism of carbon/carbon (C/C) composites modified by hafnium carbide (HfC) and silicon carbide (SiC), the composites were ablated by oxyacetylene flame for different time from 30 s to 120 s. Results show that linear ablation rate and mass ablation rate increased with ablation time prolonging. Two ablation regions were discussed: the center-most...
An AlPO 4 oxidation-protective coating was successfully prepared on SiC pre-coated carbon/carbon composites (SiC–C/C) by pulse arc discharge deposition. The structure and oxidation resistance of the as-prepared AlPO 4 /SiC multilayer coatings were investigated. The results were confirmed by oxidation experiments performed at 1573 K, 1673 K and 1773 K, which demonstrated that the AlPO...
To further improve the oxidation resistance of coating for carbon/carbon (C/C) composites, a multi-layer CVD-SiC/MoSi 2 –CrSi 2 –Si/B-modified SiC coating was prepared on the surface of C/C composites by pack cementation and chemical vapour deposition method, respectively. The microstructures, oxidation and thermal shock resistance of the coating were studied. The influence of B content...
To find out the effects of SiC addition on the ablation properties of carbon/carbon (C/C) composites, C/C composites with and without SiC addition were ablated by oxyacetylene torch in different heat fluxes. Results indicated that the SiC addition improved the ablation property of C/C composites in the case of heat flux below 3.64 ± 10% MW/m 2 whereas it displayed an opposite effect when heat...
To protect carbon/carbon (C/C) composites against oxidation, a multilayer MoSi 2 –SiC–B coating was prepared on the SiC-coated C/C composites by a simple and low-cost slurry method. The phase, microstructure and element distribution of the as-received coating were analyzed using X-ray diffraction, scanning electron microscopy and energy dispersive X-ray spectroscopy. The as-received coating...
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