C/C-SiC:Preparation and Properties of W/Cu Composite Coatings
ZHANG Xizhi1, CUI Hong1,*, ZHANG Jiahao2, HU Yang1, DENG Hongbing1
1 Research Institute of Xi'an Aerospace Composites Materials, Xi'an 710025, China 2 Xi'an Institute of Aerospace Dynamics Measurement and Control Technology, Xi'an 710025, China
Abstract: In order to improve the ablation resistance of C/C-SiC composites and improve the brittleness of W coatings, W/Cu composite powders were prepared by cladding method, and W coating, W/Cu composite coating were prepared on the surface of C/C-SiC composites by atmosphe-ric plasma spraying technology. The effects of different W/Cu ratios (10∶0.5, 10∶1, 10∶1.5) on the microstructure, microhardness, ablation resistance and erosion resistance of the composite coatings were investigated. The results show that the W/Cu composite coating prepared by atmospheric plasma spraying will form a special Cu/W/Cu/W alternating structure. The microhardness decreased, with a maximum decrease of 45%, but the brittleness of the W coating was significantly improved, and the erosion resistance was significantly enhanced. In the process of oxyacetylene flame test with heat flux density of 4 200 kW/m2 for 60 s, the W/Cu composite coating will absorb a lot of heat due to the characteristics of low melting point and high boiling point of Cu, which can effectively reduce the surface temperature of the coating and delay the ablation. When the mass ratio of W/Cu was 10∶1, the diameter of the ablation center surface of the W/Cu composite coating was reduced by 57.4% compared with that of the W coating, and the line ablation rate and mass ablation rate were reduced by 45.5% and 42%, respectively.
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2023, Vol. 37 
