| WANG Fu-qiang,CHEN Jian,ZHANG Zhi,XIE Dong,CUI Hong.Preparation and Plasma Flame Ablation Resistance of W-SiC-C/C Composites[J],51(2):249-258, 305 |
| Preparation and Plasma Flame Ablation Resistance of W-SiC-C/C Composites |
| Received:March 08, 2021 Revised:June 28, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.02.024 |
| KeyWord:tungsten coating silicon carbide transition layer carbon/carbon composites plasma spring ablation property plasma flame |
| Author | Institution |
| WANG Fu-qiang |
School of Materials Sciense and Chemical Engineering, Xi'an Technological University, Xi'an , China |
| CHEN Jian |
School of Materials Sciense and Chemical Engineering, Xi'an Technological University, Xi'an , China |
| ZHANG Zhi |
Xi'an Aerospace Composites Institute, Xi'an , China |
| XIE Dong |
Xi'an Aerospace Composites Institute, Xi'an , China |
| CUI Hong |
Xi'an Aerospace Composites Institute, Xi'an , China |
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| Abstract: |
| This paper aims to improve the ablation resistance of C/C composites at ultra-high temperatures. SiC transition layer was prepared on the surface of C/C composite material by a chemical vapor deposition method, then Tungsten coating was prepared on SiC coated C/C composites by inert gas protecting atmospheric plasma spraying. In this paper, the morphology and composition of the W-SiC-C/C composites were studied, and the ablation resistance of the W-SiC-C/C materials was evaluated by a 200 kW ultra-high-power plasma flame, which was compared and analyzed with C/C materials for coating protection. Results show that the interface between the W coating and the SiC transition layer, and the interface between the transition layer and the substrate is a mosaic structure. The tungsten coating, SiC transition layer and the C/C substrate had a good adhesive interface. The SiC transition layer prevented the mutual migration and reaction of W and C elements from generating brittle WC. Under the ablation conditions of stagnation point pressure of 4.5 MPa, the temperature of about 5000 K, and heat flux of 36 MW/m2, when the ablation time is less than 10 s, the coating has a good protective effect on the C/C material. W Oxidative ablation occurred in the coating, the ablation was not found in the substrate, and the average linear ablation rate was 0.0523 mm/s. When the ablation is longer than 15 s, the protective effect of the coating fails, and the substrate C/C material is ablated. It is concluded that C/C composites protected by tungsten coating and SiC transition layer are suitable for short time ultra-high temperature ablation environment, such as solid rocket motors, etc. The combined effect of melt heat absorption of tungsten coating, oxidation oxygen depletion, oxidation melting of SiC transition layer to relieve the thermal stress of the coating and oxygen diffusion hindrance improves the ablation resistance of C/C materials. |
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