人工关节CoCrMo-UHMWPE 配副在不同接触应力下的摩擦、磨损和磨屑特征

王松, 付松卿, 田徐腾越, 李俊辉, 徐娟, 刘伟强

doi:10.16577/j.issn.1001-1560.2022.0336

材料保护 >

2022 , Vol. 55 >Issue 12: 33 - 39

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0336

试验研究

人工关节CoCrMo-UHMWPE 配副在不同接触应力下的摩擦、磨损和磨屑特征

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¹深圳清华大学研究院生物医用材料及植入器械实验室； ²清华大学机械工程系； ³四川大学华西口腔医学院口腔疾病研究国家重点实验室； ⁴四川大学华西口腔医学院国家口腔疾病临床医学研究中心； ⁵河南省洛阳正骨医院(河南省骨科医院)骨科中心； ⁶泗泾医院口腔科

徐娟(1975-)，博士，主任医师，研究方向为材料表面处理、3D 生物打印，电话:15811477746，E-mail:doctorxue＠126.com

收稿日期: 2022-06-27

修回日期: 2022-07-29

录用日期: 2022-08-25

网络出版日期: 2023-12-26

基金资助

广东省自然科学基金(2020B1515120082)；深圳市自然科学基金(JCYJ20190807144001746，JSGG20191129114422849)资助

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Friction， Wear and Debris Characteristics of Artificial Joint CoCrMo-UHMWPE Pair under Different Contact Stresses

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(1. Biomechanics and Biotechnology Lab， Research Institute of Tsinghua University in Shenzhen， Shenzhen 518057， China；2. Department of Mechanical Engineering， Tsinghua University， Beijing 100084， China；3a. State Key Laboratory of Oral Diseases Research， 3b. National Clinical Research Center for Oral Diseases，West China Hospital of Stomatology， Sichuan University， Chengdu 610041， China；4. Orthopedic Center， Luoyang Orthopedic Hospital of Henan Province (Orthopedic Hospital of Henan Province)， Zhengzhou 450002， China；5. Department of Stomatology， Sijing Hospital， Shanghai 201601， China)

Received date: 2022-06-27

Revised date: 2022-07-29

Accepted date: 2022-08-25

Online published: 2023-12-26

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摘要

因磨屑引起的假体骨溶解现象是导致人工关节临床失效的关键因素之一。为了解假体材料的摩擦磨损和摩屑特征并优化假体摩擦学设计，选用人工关节最常用的钴铬钼-超高分子量聚乙烯(CoCrMo-UHMWPE)配副，采用新生牛血清溶液作为润滑介质，分别在22，35，48，60 MPa 点面接触应力下开展了5 万次往复滑动摩擦实验，通过多功能摩擦磨损试验机、金相显微镜、扫描电子显微镜等仪器研究了CoCrMo-UHMWPE 配副的摩擦系数、磨损量和磨损形貌，进而表征了其摩擦磨损特性，并采用酸分解方法研究了磨屑的数量、尺寸、形貌及分布特征。结果表明:接触应力对CoCrMo-UHMWPE 配副的摩擦、磨损和磨屑特征均有显著影响。随着接触应力逐渐增大，CoCrMo-UHMWPE 配副的摩擦系数变化不大但具有降低趋势，磨损量则显著增加且具有一定线性关系，磨损形貌也显示出更严重的犁沟和划痕现象。在磨屑特征方面，接触应力增大会使尺寸小于5 μm 的磨屑的数量显著增加，但磨屑数量总量先增加后降低，典型磨屑形貌则以块状为主，同时伴随少量尺寸更小的球状和片状磨屑。

关键词： 人工关节; 超高分子量聚乙烯; 接触应力; 磨屑特征

本文引用格式

王松, 付松卿, 田徐腾越, 李俊辉, 徐娟, 刘伟强 . 人工关节CoCrMo-UHMWPE 配副在不同接触应力下的摩擦、磨损和磨屑特征[J]. 材料保护, 2022 , 55(12) : 33 -39 . DOI: 10.16577/j.issn.1001-1560.2022.0336

Abstract

Osteolysis of prosthesis caused by wear debris is one of the key factors leading to clinical failure of artificial joints. In order to understand the friction， wear and debris characteristics of prosthesis materials and optimize the tribological design of prosthesis， the most commonly used cobalt chromium molybdenum-ultra-high molecular weight polyethylene (CoCrMo-UHMWPE) pair was selected as artificial joint， and neonatal bovine serum solution was used as the lubricant. Subsequently， a 50，000 reciprocating sliding wear experiment was carried out under the point-to-surface contact stresses of 22， 35， 48 and 60 MPa， respectively. The friction coefficient， wear amount and wear morphology of the CoCrMo-UHMWPE pair were studied by multi-functional friction and wear testing machine， metallographic microscope， scanning electron microscope and other instruments， and then its friction and wear characteristics were characterized. Furthermore， the quantity，size， morphology and distribution characteristics of wear debris were studied by acid decomposition method. Results showed that the contact stress had a significant effect on the friction， wear and wear debris characteristics of the CoCrMo-UHMWPE pair. With the gradual increase of contact stress， the friction coefficient of CoCrMo-UHMWPE pair changed little but had a downward trend， the wear amount increased significantly and presented a certain linear relationship， and the wear morphology also showed more serious furrows and scratches. In terms of wear debris characteristics， the increase of contact stress led to a significantly increase of the number of wear debris with a size smaller than 5 μm，but the total amount of wear debris first increased and then decreased. Besides， the typical morphology of wear debris was mainly blocky， accompanied by a small amount of spherical and flaky wear debris of smaller sizes.

Key words： artificial joint; ultra-high molecular weight polyethylene; contact stress; wear debris characteristics

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