| 摘要: |
| 采用超音速火焰喷涂技术在Ti-6Al-4V合金表面制备WC-17Co涂层，从显微形貌、界面氧化行为、裂纹扩展形式等方面系统分析了WC-17Co涂层与Ti-6Al-4V基体界面断裂失效原因，并利用四点弯曲法测量了WC-17Co与Ti-6Al-4V合金的平均断裂能量释放率.结果表明，热喷涂过程使Ti-6Al-4V的表面氧化相含量显著提高.氧化后Ti-6Al-4V的表面显微硬度达到322.4 HV，熔融粒子撞击到Ti-6Al-4V表面很难对基体造成明显的塑性变形，不能形成有效咬合，使得钛合金与WC-17Co涂层的结合性能偏低. |
| 关键词: 超音速火焰喷涂 Ti-6Al-4V合金 WC-17Co涂层 断裂能量释放率 氧化 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金青年基金资助项目（51501222）；中央高校基本科研业务经费中国民航大学专项基金资助项目（3122015L001）；中国民航局科技计划资助项目（MHRD20160106） |
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| Analysis of bonding properties between WC-17Co coating and titanium alloy |
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JI Zhaohui, SUN Zhen, DING Kunying, WANG Zhiping
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Tianjin Key Laboratory for Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin 300300, China
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| Abstract: |
| A WC-17Co coating was fabricated on the face of titanium alloy by using high velocity oxy-fuel (HVOF) technology. The bonding properties between WC-17Co coating and Ti-6Al-4V substrate were discussed. The reasons of boundary fracture were analyzed through the microscopic morphology, oxidation behavior, and the form of crack propagation. Critical strain energy release rate Gss of WC-17Co/Ti-6Al-4V is measured by four-point bending test. The low interface bonding strength of WC-17Co/Ti-6Al-4V was ascribed to the increased micro-hardness (322.4 HV) of Ti-6Al-4V after oxidization, so it does not generate apparent deformation when molten particles impact on its surface. |
| Key words: HVOF Ti-6Al-4V WC-17Co critical strain energy release rate oxidation |
