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| Preparation and Ablation Resistance of YSZ-W Composite Coating |
| Received:February 17, 2020 Revised:March 24, 2020 |
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| DOI：10.7643/issn.1672-9242.2021.02.015 |
| KeyWord:ablation resistance YSZ-20%W spray drying-vacuum sintering atmospheric plasma spraying supersonic combustion flame |
| Author | Institution |
| BAI Yi-xin |
School of Materials Science & Engineering, Beijing Institute of Technology, Beijing , China |
| WANG Quan-sheng |
School of Materials Science & Engineering, Beijing Institute of Technology, Beijing , China |
| NING Xian-jin |
School of Materials Science & Engineering, Beijing Institute of Technology, Beijing , China |
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| Abstract: |
| This paper aims to improve and preliminarily study the ablation resistance of TC4 alloy in supersonic combustion environment by preparing YSZ-20%W (ZW2) coating on it. ZW2 composite powder for spraying is prepared by spray drying-vacuum sintering method and using 8YSZ and W power as raw materials. ZW2 composite coating is deposited by atmospheric plasma spraying (APS). The ablation resistance is evaluated by supersonic combustion flame (SCF) test. After sintering at 1500 ℃ for 2 hours, original particles in ZW2 composite powder changed from PVA cross linking to metallurgical bonding, the bulk density and fluidity improved by 632.3% and 39.8%, respectively, compared with the granulating powder. The ZW2 coating deposited by APS was uniform and compact, with a porosity of 9.5%±0.8%. After ablation for 5s in supersonic combustion flame, the 500 μm ZW2 coating can prevent the TC4 titanium alloy substrate from ablation, and a ZrO2-WO3 loose top layer with a thickness of about 30 μm is formed on the ZW2 coating. It can be concluded that a uniform and dense ZW2 composite coating is prepared by APS process, and the APS adaptability of ZW2 composite powders is improved through the vacuum sintering treatment. ZW2 coating effectively improves the ablation resistance of TC4 alloy, the low melting point WO3 formed during the ablation process relieves the thermal stress inside the coating and eventually prevents the coating from peeling off in advance. |
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