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- 2015
牛血清环境下等离子喷涂ZrO2增强羟基磷灰石涂层的摩擦磨损性能
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Abstract:
为了研究ZrO2增强羟基磷灰石(HA)复合涂层在牛血清润滑环境下的摩擦磨损性能, 首先, 采用等离子喷涂技术在钛合金基体上制备了ZrO2含量分别为0、15wt%和30wt%的HA生物陶瓷涂层;然后, 分析了ZrO2/HA复合涂层的物相成分和结合强度;最后, 采用UMT-3销盘摩擦试验机研究了ZrO2/HA复合涂层在牛血清润滑环境下的摩擦磨损性能, 观察涂层磨损表面微观形貌并分析了磨损机制.结果表明:HA涂层的主要物相为HA, 15wt% ZrO2/HA复合涂层和30wt% ZrO2/HA复合涂层中的ZrO2以立方相形式存在, 并且衍射峰强度高于HA的.随着ZrO2含量增大, 涂层的结合强度明显增大.ZrO2/HA复合涂层与纯HA涂层相比, 有更好的耐磨性和更低的摩擦系数.纯HA涂层的磨损机制以犁沟效应和磨粒磨损为主, 而15wt% ZrO2/HA复合涂层和30wt% ZrO2/HA复合涂层的磨损机制为脆性剥落磨损. In order to investigate the friction and wear properties of ZrO2 reinforced hydroxyapatite (HA) composite coatings in bovine serum lubrication environment, HA bio-ceramic coatings whose ZrO2 contents were 0, 15wt% and 30wt% respectively were prepared on titanium alloy substrates by plasma spraying technology firstly. Then, the phase formation and bonding strength of ZrO2/HA composite coatings were analyzed. Finally, the friction and wear properties of ZrO2/HA composite coatings in bovine serum lubrication environment were investigated with UMT-3 pin-disk wear tester, the morphologies of wear surfaces of coatings were observed and the wear mechanisms were analyzed. The results show that the main phase of HA coatings are HA, the ZrO2 in 15wt% ZrO2/HA composite coating and 30wt% ZrO2/HA composite coating exists as cubic phase formation and the diffraction peak intensities are higher than that of HA. As the ZrO2 content increasing, the bonding strength of coatings increases significantly. The ZrO2/HA composite coatings have superior wear resistance and lower friction coefficients compared with those of pure HA coating. The wear mechanisms of pure HA coating are ploughing and abrasive wear primarily, while the wear mechanisms of 15wt% ZrO2/HA composite coating and 30wt% ZrO2/HA composite coating are brittle spalling wear. 国家自然科学基金(51105339,51275471);中国博士后科学基金(2013M540498)
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