湛思唯,汤军辉,王奉涛,纪秀林.激光熔覆TiZrHfCrMoW涂层在大气和模拟体液环境下的摩擦磨损行为[J].表面技术,2023,52(1):29-37.
ZHAN Si-wei,TANG Jun-hui,WANG Feng-tao,JI Xiu-lin.Tribological Behavior of Laser Clad TiZrHfCrMoW High-entropy Alloy Coating in Air and in Simulated Body Solution[J].Surface Technology,2023,52(1):29-37 |
| 激光熔覆TiZrHfCrMoW涂层在大气和模拟体液环境下的摩擦磨损行为 |
| Tribological Behavior of Laser Clad TiZrHfCrMoW High-entropy Alloy Coating in Air and in Simulated Body Solution |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.01.003 |
| 中文关键词: 激光熔覆 高熵合金 摩擦磨损 腐蚀磨损 模拟体液 |
| 英文关键词:laser cladding high entropy alloy friction and wear tribocorrosion simulated body fluid |
| 基金项目:李嘉诚基金会交叉研究资助项目(2020LKSFG01D);广东省高校创新团队项目(2020KCXTD012) |
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| Author | Institution |
| ZHAN Si-wei | College of Engineering, Shantou University, Guangdong Shantou 515063, China |
| TANG Jun-hui | Hangzhou Wiseking Surgical Robot Co., Ltd., Hangzhou 311100, China |
| WANG Feng-tao | College of Engineering, Shantou University, Guangdong Shantou 515063, China |
| JI Xiu-lin | College of Engineering, Shantou University, Guangdong Shantou 515063, China |
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| 中文摘要: |
| 目的 提高钛合金表面耐磨性。方法 采用激光熔覆技术在TC4基体表面制备TiZrHfCrMoW涂层，采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)等分析涂层的相组成和显微组织结构。联合电化学工作站和摩擦磨损试验仪，分别在大气和37 ℃的0.9%NaCl模拟体液环境条件下，研究TiZrHfCrMoW高熵合金(HEA)涂层与TC4合金的摩擦磨损行为。结果 激光熔覆HEA涂层均匀致密，无明显缺陷，主要由2种BCC相及1种未知相组成，涂层平均硬度为584.6HV0.2，约为TC4基材硬度的1.6倍。在空气中滑动时，HEA涂层在0.3、0.5、1 N下的磨损率均比TC4基体低，且涂层的磨损率随载荷的增加而增加，TC4的磨损率则相反。在(37±0.5) ℃的0.9%NaCl溶液中，0.5 N载荷下TC4的磨损率是HEA涂层的6倍。HEA涂层与TC4钛合金基体相比，具有更高的自腐蚀电位和更低的腐蚀电流密度。模拟体液环境下HEA涂层的主要磨损机制为逐层剥落和腐蚀磨损。结论 激光熔覆HEA涂层可以有效提高TC4合金的耐磨损及耐腐蚀性能。 |
| 英文摘要: |
| To improve the wear and corrosion resistance of TC4 titanium alloy, TiZrHfCrMoW high-entropy alloy (HEA) coating was prepared on the surface of TC4 stainless steel by laser cladding, and the tribological behavior of the HEA coating were investigated in air and in 0.9% NaCl solution at (37±0.5) ℃. The microstructure, hardness, COF and OCP curves of HEAs coating and TC4 were measured by experiments. Explore the effect of friction coefficient, hardness and microstructure on the surface fretting wear performance after laser cladding. The microstructure of the HEA coating is uniform, compact, and no defects. It is mainly composed by two body-centered cubic (BCC) solid solution phases and an unknown phase. The average hardness of the HEA coating is around 584.6HV0.2, which is about 1.6 times of the hardness of the substrate TC4. When sliding in the air, the wear rate of the HEA coating was lower than that of the TC4 substrate at 0.3 N, 0.5 N and 1 N. Accordingly, the wear rates are lower over 31 times, 10 times and 1 time than those of TC4 at 0.3 N, 0.5 N and 1 N, respectively. Moreover, the wear rate of the HEA coating increased with the increase of the load, while the wear rate of TC4 was opposite. In 0.9% NaCl solution at (37±0.5) ℃, the wear rate of TC4 under 0.5 N load was 6 times higher than that of HEA coating. Compared with TC4 titanium alloy substrate, HEA coating has higher self-corrosion potential and lower corrosion current density. The main wear mechanism of the HEA coating in the simulated body fluid environment is layer-by-layer exfoliation and corrosion wear. Compared to TC4 alloy, the HEA coating exhibits a high coefficient of friction and low wear rate in both air and 0.9% NaCl solution at (37±0.5) ℃. This is due to the higher hardness of the HEA coating, which increases the resistance of the surface to plastic deformation and the wear resistance, but the coefficient of friction of the HEA coating is slightly higher than that of the TC4 substrate under experimental loading, indicating a different surface contact state. Worn morphologies of HEAs coating in air and 0.9% NaCl solution at (37±0.5) ℃ have some similarities. The main difference is the higher proportion of abrasive wear at higher loads (1 N) in air. In 0.9% NaCl solution, the main wear mechanisms of the HEA coatings are layer-by-layer spalling and corrosive wear. The coating had a higher self-corrosion potential and a lower corrosion current density than the TC4 titanium alloy substrate. Electrochemical test showed that the passive film in the wear track area was only partially destroyed during the corrosive wear test and the corrosion product film affects friction coefficient. In conclusion, laser clad HEA coating can effectively improve the wear resistance and corrosion resistance of TC4 alloy. This work not only provides new ideas and methods for surface modification of TC4, but also shows the advantage of TiZrHfCrMoW coating applied in corrosive wear environment. |
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