毕业设计(论文)-钛合金与UHMWPE界面间的往复摆动.doc
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1、本科生毕业设计姓 名: 学 号 学 院: 材料科学与工程学院 专 业: 材料科学与工程 设计题目: 钛合金与UHMWPE界面间的往复摆动 摩擦磨损特性研究 专 题: 指导教师: 职 称: 教授 职 称: 教授 年 月 摘 要在颈椎退变的治疗中,人工椎间盘置换术(TDR)具有保持手术节段正常活动度和稳定性、改善邻近椎间隙内压力、减少邻近节段新发病率等优点,被认为是最有发展前景的脊柱生物力学重建技术。TDR使用的人工颈椎间盘中,球窝型人工椎间盘作为最常用的一种,其关节面间的摩擦磨损是影响TDR的重要因素。本文选用Ti6Al4V合金(TC4)窝和超高分子量聚乙烯(UHMWPE)球为配副材料,研究球窝
2、型摩擦副在不同生物介质中往复摆动摩擦磨损性能。往复摆动角度分别为2.5、5、7.5,接触载荷分别为50N、100N、150N,润滑条件分别为干摩擦、模拟体液和小牛血清。利用摩擦副间摩擦系数变化、光学表面形貌、UHMWPE的磨损量和磨屑粒度等分析其磨损机理。结果表明:摩擦副的磨损随往复摆动角度和接触载荷的增大而加剧。干摩擦条件下摩擦副的磨损状况最严重,钛合金的磨损以磨粒磨损和氧化磨损为主,UHMWPE的磨损以粘着磨损和磨粒磨损为主;在模拟体液、牛血清润滑条件下,摩擦系数、磨损量和表面擦伤均有不同程度的降低。润滑条件下磨损机理以粘着磨损和磨粒磨损为主,并存在少量的氧化磨损。关键词:人工椎间盘; 钛
3、合金; 超高分子量聚乙烯; 往复摆动; 摩擦磨损特性 ABSTRACTTotal disc replacement (TDR) can be used to replace a degenerated intervertebral disc in the spine. Its a motion preservation device which can improve pressure within the intervertebral space adjacent and reduce a high incidence of adjacent disc degeneration. There
4、fore, TDR is considered as the most promising spinal biomechanics reconstruction. One important part used in TDR is artificial cervical disc. Among current designs, ball-and-socket combination is one of the most common artificial cervical discs. The friction and wear between the bearing surfaces wer
5、e significant factors influencing TDR. The present work attempts to explore the friction and wear properties of ball-and-socket combination in various biological media under jigging motion conditions, using titanium alloy socket and ultra high molecular weight polyethylene (UHMWPE) ball. The tribolo
6、gical tests were performed at the swing angles of 2.5,5and7.5, under the contact loads of 50,100and 150N, in SBF and new born calf serum lubrication condition, respectively. The friction coefficient,wear rate,worn shape characteristic and wear debris were measured to analyze the wear mechanisms.The
7、results reveal that the wear amounts of ball-and-socket combination increases with the increasing of angles and loads and are the worst under the dry friction. The wear mechanisms of titanium are mainly the combination of abrasive wear and oxidation wear, while the wear mechanisms of UHMWPE are the
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