The effect of contact load on CoCrMo wear and the formation and retention of tribofilms.
The effect of contact load on CoCrMo wear and the formation and retention of tribofilms.
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DOI：
10.1016/j.wear.2015.02.013
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发表时间：
2015-05
期刊：
影响因子：
5
通讯作者：
Fischer, A.
中科院分区：
文献类型：
--
作者：
Wimmer, M. A.;Laurent, M. P.;Mathew, M. T.;Nagelli, C.;Liao, Y.;Marks, L. D.;Jacobs, J. J.;Fischer, A.
蛋白质润滑金属-金属(MOM)滑动接触中的摩擦化学反应可能对其磨损性能起重要作用。这样的反应会形成一层碳质的摩擦膜，它可以作为防止腐蚀和磨损的保护层。本研究的目的是确定接触载荷对摩擦磨损以及摩擦膜的形成和保持的影响。磨损测试是在定制的球面测试设备中进行的，该设备包含了一个电化学电池。用陶瓷球在牛血清中对接低碳锻造CoCrMo合金销钉。在单一恒电位条件下(接近自由电位)，使用一系列接触载荷，评估了重量损失和表面性质的变化。我们确定磨损受载荷条件的影响。正如预期的那样，磨损量随着载荷的增加而增加，但施加的载荷和测量的重量损失之间的关系并不是线性的。在中等载荷范围内，在32-48N(~58-80 Mpa)范围内，单位载荷的磨损量下降了一个数量级以上，磨损与载荷的数据表明在49N处有一个拐点，回归分析得到了三次模型(R2=0.991；p=0.0002)，其中代表拐点的三次项非常显著(p=0.0021)。摩擦-载荷曲线的最小值在52N处，极化电阻的最大相对增量出现在49N处的观察结果支持了这一模型。扫描电子显微镜和拉曼光谱表明，在低载荷和高载荷情况下的接触区域内没有摩擦膜。磨损和腐蚀的协同作用似乎起着重要的作用。
Tribochemical reactions in a protein lubricated metal-on-metal (MoM) sliding contact may play a significant role for its wear performance. Such reactions lead to the formation of a carbonaceous ‘tribofilm’, which can act as a protective layer against corrosion and wear. The purpose of this study was to determine the effect of contact load on wear and the formation and retention of tribofilms. Wear tests were performed in a custom-made ball-on-flat testing apparatus that incorporated an electrochemical cell. A ceramic ball was used to articulate against low-carbon wrought CoCrMo alloy pins in bovine serum. Using a range of contact loads at a single potentiostatic condition (close to free potential), weight loss and changes in surface properties were evaluated. We determined that wear was influenced by the loading condition. As expected, wear increased with load, but the association between applied load and measured weight loss was not linear. In the intermediate load region, in the range of 32–48 N (~58–80 MPa), there was more than an order of magnitude drop in the wear per unit load, and the wear versus load data suggested an inflexion point at 49 N. Regression analyses yielded a cubic model (R2=0.991; p=0.0002), where the cubic term, which represents the inflexion, was highly significant (p=0.0021). This model is supported by the observations that the minimum in the friction versus load curve is at 52 N and the highest relative increase in polarization resistance occurred at 49 N. Scanning electron microscopy and Raman spectroscopy indicated the absence of a tribofilm for the low and within the contact area of the high load cases. Synergistic interactions of wear and corrosion seem to play an important role.
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影响因子：
5
作者：
Mathew, M. T.;Runa, M. J.;Laurent, M.;Jacobs, J. J.;Rocha, L. A.;Wimmer, M. A.
通讯作者：
Wimmer, M. A.
DOI：
10.1016/j.jmbbm.2011.07.008
发表时间：
2011-11-01
影响因子：
3.9
作者：
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通讯作者：
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影响因子：
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作者：
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通讯作者：
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影响因子：
5
作者：
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通讯作者：
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影响因子：
5.3
作者：
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通讯作者：
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