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为了研究ZrO_2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ZrO_2含量分别为0、15wt%和30wt%的HA生物陶瓷涂层;然后,分析了ZrO_2/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ZrO_2/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%ZrO_2/HA复合涂层和30wt%ZrO_2/HA复合涂层中的ZrO_2以立方相形式存在,并且衍射峰强度高于HA的。随着ZrO_2含量增大,涂层的结合强度明显增大。ZrO_2/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%ZrO_2/HA复合涂层和30wt%ZrO_2/HA复合涂层的磨损机制为脆性剥落磨损。
In order to study the friction and wear properties of hydroxyapatite (HA) composite coatings in bovine serum lubricated environment, ZrO 2 was first prepared on titanium alloy substrate by plasma spraying technology with ZrO 2 content of 0,15wt% and 30wt% HA bioceramic coating. Then, the phase composition and bonding strength of the ZrO 2 / HA composite coating were analyzed. Finally, the tribological properties of the ZrO 2 / HA composite coating in a bovine serum-lubricated Friction and wear properties were observed. The microstructure of the wear surface was observed and the wear mechanism was analyzed. The results show that the main phase of HA coating is HA. The ZrO_2 in 15wt% ZrO_2 / HA composite coating and 30wt% ZrO_2 / HA composite coating exists in cubic phase, and the diffraction peak intensity is higher than that of HA. With the increase of ZrO 2 content, the bonding strength of the coating increases obviously. ZrO 2 / HA composite coatings have better abrasion resistance and lower coefficient of friction than pure HA coatings. The wear mechanism of pure HA coating is mainly furrow effect and abrasive wear, while the wear mechanism of 15wt% ZrO_2 / HA composite coating and 30wt% ZrO_2 / HA composite coating is brittle flaking wear.