Ablation resistance of HfC–SiC coating prepared by supersonic atmospheric plasma spraying for SiC-coated C/C composites

2016 ◽  
Vol 42 (4) ◽  
pp. 4768-4774 ◽  
Author(s):  
Yang Yang ◽  
Kezhi Li ◽  
Zhigang Zhao ◽  
Hejun Li
Keyword(s):  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Ablation Resistance ◽  
Supersonic Atmospheric Plasma Spraying

scholarly journals Ablation mechanism and morphology evolution of the HfC-SiC coating for C/C composites deposited by supersonic atmospheric plasma spraying

2019 ◽  
Vol 28 ◽  
pp. 096369351986994 ◽  
Author(s):  
Yang Yang ◽  
Kezhi Li ◽  
Chun Zhao
Keyword(s):  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Carbon Composites ◽  
X Ray Diffraction ◽  
Ablation Resistance ◽  
Ablation Mechanism ◽  
Coated Carbon ◽  
Supersonic Atmospheric Plasma Spraying ◽  
New Phase

HfC-SiC protective coating was deposited on the surface of SiC-coated carbon/carbon composites by supersonic atmospheric plasma spraying due to the high arc temperature and the efficient deposition rate. The morphology and microstructure of the HfC-SiC coating were analyzed by X-ray diffraction and scanning electron microscopy. The results showed that Hf and Si elements distributed uniformly in the coating and the coating was dense without crack. Ablation resistance test was processed by oxyacetylene torch. During the ablation process, the sintering rate of HfO2 was slow, and more oxygen diffused into the internal coating, which caused the oxidation of the internal coating and damaged the structure of internal coating in the ablation center region. In addition, during cooling process, a new phase HfSiO4 was generated by the reaction between HfO2 and SiO2, which acted as a pinning agent to prevent the further expansion of the crack.

Ablation Behavior of HfC Coating Prepared by Supersonic Plasma Spraying for SiC-Coated C/C Composites

2015 ◽  
Vol 24 (5) ◽  
pp. 096369351502400 ◽  
Author(s):  
Yang Yang ◽  
Kezhi Li ◽  
Hejun Li
Keyword(s):  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
X Ray Diffraction ◽  
Dense Structure ◽  
X Ray ◽  
Ablation Resistance ◽  
Supersonic Plasma ◽  
Centre Region ◽  
Supersonic Atmospheric Plasma Spraying

In order to improve the ablation resistance of C/C composites HfC coating was deposited on the surface of SiC-coated C/C composites by supersonic atmospheric plasma spraying. The microstructure and morphology of the different coatings were characterized by Scanning Electron Microscopy, X-ray diffraction. The ablation test of samples was carried out with an oxyacetylene torch. The coating exhibits dense structure and good ablation resistance. After ablation for 30s, the linear and mass ablation rates of the coating are 0.59 μm/s and 0.6 mg/s, respectively. In ablation centre region, a HfO2 layer is formed on the surface of sample after 30s ablation, and it can protect C/C composites from ablation.

Lanthanum hydride doped tungsten-based coating fabricated by supersonic atmospheric plasma spraying

2016 ◽  
Vol 299 ◽  
pp. 153-161 ◽  
Author(s):  
Qing Yu Hou ◽  
Lai Ma Luo ◽  
Zhen Yi Huang ◽  
Ping Wang ◽  
Ting Ting Ding ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Supersonic Atmospheric Plasma Spraying
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