| 摘要: |
| 以Ti6Al4V合金、类金刚石薄膜（DLC膜）改性Ti6Al4V合金分别与超高分子量聚乙烯（UHMWPE）配副，模拟颈椎间盘的轴向旋转运动，并在改装后的多自由度磨损试验机上进行扭动摩擦试验。结果表明：随着循环周次的增加，两对摩擦副均呈现出摩擦扭转力矩、摩擦耗散能、磨损量相应增大的趋势。与Ti6Al4V合金相比，DLC薄膜改性后的Ti6Al4V合金摩擦副接触界面间摩擦扭转力矩降低了51.6%、摩擦耗散能降低了48%，进入完全滑移状态的时间缩短，具有更好的耐磨性。Ti6Al4V合金的磨损机制表现为严重的磨粒磨损，经DLC薄膜改性后的钛合金的磨损形式以应力集中产生的脆性剥落为主。DLC薄膜增大了对磨副UHMWPE的磨损，UHMWPE的磨损机制是粘着磨损和磨粒磨损综合作用的结果。 |
| 关键词: Ti6Al4V合金 DLC薄膜 扭动 磨损机理 |
| DOI：10.11933/j.issn.1007-9289.2016.04.009 |
| 分类号: |
| 基金项目:国家自然科学基金（51275514）；江苏省自然科学基金（BK20130200）；中国博士后科学基金（2015M580487） |
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| Torsional Friction and Wear Characteristics of Ti6Al4V Alloy Modified by DLC Film |
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XU Lin-min1,2, ZHANG De-kun2, CHEN Kai2, YANG Xue-hui2, WANG Qing-liang2, QI Jian-wei2
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1.School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu;2.School of Materials Science and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu
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| Abstract: |
| The Ti6Al4V alloy and Ti6Al4V alloy modified by diamond-like carbon (DLC) film were matched with ultrahigh molecular weight polyethylene (UHMWPE) to simulate the axial rotating movement of cervical discs. The torsional friction experiments were conducted on the modified multi degree of freedom material abrasion tester. The results show that the friction rotating torque, friction dissipated energy and wear loss of the two friction pairs shows the increasing trend with the increasing of cycle number. Comparing with Ti6Al4V alloy, the friction rotating torque decreased by 51.6% and the frictional dissipated energy decreased by 48% on the friction pair contact interface of the Ti6Al4V alloy modified by DLC film. Besides, the time of entering the complete slip state is shortened and the wear resistance is improved. The wear mechanism of Ti6Al4V alloy presents the serious abrasive wear, while the Ti6Al4V alloy modified by DLC film shows the brittle spalling generated by stress concentration. However, DLC film increases the wear of the UHMWPE. The wear mechanism of the UHMWPE is the combined effect of adhesive wear and abrasive wear. |
| Key words: Ti6Al4V alloy DLC film torsion wear mechanism |
