THE EFFECT OF TRIBOFILM FORMATION AND HUMIDITY ON THE FRICTION AND WEAR PROPERTIES OF CERAMIC MATERIALS
THE EFFECT OF TRIBOFILM FORMATION AND HUMIDITY ON THE FRICTION AND WEAR PROPERTIES OF CERAMIC MATERIALS
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DOI：
10.1115/1.2920851
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发表时间：
1992-01-01
影响因子：
2.5
通讯作者：
LI, H
中科院分区：
文献类型：
--
作者：
KOMVOPOULOS, K;LI, H
通过实验研究了无润滑陶瓷材料摩擦膜的形成和破坏过程以及主要的摩擦机理。 湿度控制气氛中的滑动实验表明，界面摩擦膜的形成显着影响陶瓷的稳态摩擦磨损性能。 扫描电子显微镜和各种成分分析技术表明，虽然可能发生摩擦化学反应，摩擦膜形成的主要机制是从两个滑动表面产生的细磨屑的产生，团聚和压实。 摩擦膜表现出不同的摩擦学特性，这取决于它们的元素组成和湿度。 对于所有的陶瓷对测试，稳态摩擦系数随相对湿度的下降。 与传统的断裂韧性方法相比，表面轮廓术和显微镜研究表明，最高的磨损率与最强硬的陶瓷。 犁槽平行于滑动方向，细磨屑的圆形和圆柱形，微裂纹，和局部脱层的摩擦膜进行了鉴定。 显微镜观察表明，邻近摩擦膜界面的次表面材料的损伤是不可测量的。 磨损表面地形特征的定性比较表明，根据湿度和陶瓷类型，摩擦膜的微塑性、微断裂和分层是主要的稳态摩擦机制。
The processes of tribofilm formation and disruption and the predominant tribo-mechanisms of unlubricated ceramic materials were investigated experimentally. Sliding experiments in humidity controlled atmospheres revealed that the formation of interfacial tribofilms significantly affects the steady-state friction and wear properties of ceramics. Scanning electron microscopy and various composition analysis techniques demonstrated that although tribochemical reactions might occur, the principal mechanisms of tribofilm formation were the generation, agglomeration, and compaction of fine wear debris produced from both sliding surfaces. The tribofilms exhibited different tribological characteristics, depending on their elemental compositions and the humidity. For all the ceramic pairs tested, the steady-state coefficients of friction decreased with relative humidity. In contrast to the conventional fracture toughness approach, surface profilometry and microscopy studies showed that the highest wear rates were encountered with the toughest ceramic. Plowing grooves parallel to the direction of sliding, fine wear debris of round and cylindrical shapes, microcracking, and localized delamination of the tribofilms were identified. Microscopic observations suggested that damage of the subsurface material adjacent to the interface of the tribofilms was immeasurable. Qualitative comparison of the topographical features of worn surfaces indicated that, depending on the humidity and the type of ceramic, microplasticity, micro-fracture, and delamination of the tribofilms were the prevailing steady-state tribomechanisms.