Page 177 - 《摩擦学学报》2021年第6期

962 摩 擦
低了37.14%，这表明ZrO /DLC较小的接触面积增加
2
了转移膜的有效覆盖区域，导致其摩擦系数最小，进
一步解释了ZrO / DLC干摩擦试验结果. 如图8(b)所
2
示，对于不同的金属摩擦副，摩擦系数随接触半径变
化没有发现明显的规律，这是由于一方面金属球的磨
斑远大于陶瓷球的磨斑，摩擦过程中金属球的实际接
触半径与公式计算得到的初始接触半径相差较大；另
一方面金属球与DLC摩擦时受到材料特性及摩擦化
学反应等其他复杂因素影响较明显，故其初始接触半
径与摩擦系数没有明显的相关性.
3 结论
a. 利用PECVD方法在TC4钛合金基材上制备了
Ti/TiN/TiNC/DLC的表面梯度复合薄膜，该复合薄膜
与钛合金基底结合紧密且断面膜层较均匀，具有较好
的力学性能.
b. 进行了DLC薄膜对不同陶瓷球干摩擦学性能
研究，结果表明，在摩擦磨损过程中由于陶瓷球具有
较高的硬度和耐磨性，陶瓷球上存在比较稳定的DLC
薄膜的碳质转移膜. SiC/DLC、Si N /DLC和ZrO /DLC
3
4
表现为轻微的磨粒磨损和黏着磨损，而Al O /DLC的
薄膜发生破损和剥落. SiC/DLC和ZrO /DLC的摩擦系
2
数和DLC磨损率均较低，SiC和ZrO 对偶球的磨斑也
2
较小，因此SiC/DLC和ZrO /DLC是较合适的摩擦副.
2
c. 进行了DLC薄膜对不同金属球干摩擦学性能
研究，结果表明，在摩擦磨损过程中，与陶瓷/DLC摩
擦副相比，低硬度的金属球易磨损，碳质转移膜随球
磨损而流失，导致摩擦系数比陶瓷/DLC高. Al/DLC主
要表现为严重的磨粒磨损，而Brass/DLC主要为轻微
的黏着磨损，304SS/DLC和GCr15/DLC为轻微的磨粒
磨损和黏着磨损. 304SS/DLC和GCr15/DLC具有较低
的摩擦系数、DLC薄膜的低磨损率以及较小的球磨
斑，因此304SS/DLC和GCr15/DLC也是较合适的摩
擦副.
d. 根据赫兹接触分析计算各摩擦副的接触半径，
结果表明，陶瓷/DLC的摩擦系数与初始接触半径的变
化趋势相似，二者存在着一定的相关性；而对于金属/
DLC的摩擦系数与初始接触半径没有明显的相关性.
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