Effects of various counterface roughness components (i.e., magnitude, density, direction) on polymer wear and transfer film are strongly coupled and difficult to isolate and test. Previous works found counterface roughness grooves and ridges perpendicular to the direction of sliding were generally beneficial to debris retention and tribofilm formation, but the effect was competing with a decrease in debris retention caused by in-situ generated furrows parallel to the direction of sliding. To further study the effect of roughness directionality on polymer wear, a model polymer solid lubricant (5 wt% Al₂O₃-PTFE) was slid against counterfaces with laser-textured grooves parallel to the direction of reciprocated sliding and a 2 × 3 variable matrix of groove depth and density. The results found: (1) all textures yielded higher polymer wear than the untextured surface did, (2) counterface with the deepest, densest grooves had the highest polymer wear rate and transient wear volume (wear volume during run-in sliding), (3) shallow groove textures generally produced less wear of the counterface and polymer, stronger tribofilm IR signature and more continuous and complete tribofilms than deep groove textures did. A new roughness parameter (I_Ra) was defined as a single, unified and comprehensive metric for counterface roughness directionality. By comparing with a previous study, the results found a general correlation between I_Ra and polymer transient wear volume and suggested strong beneficial effects of perpendicular grooves on debris retention and parallel grooves on debris ejection. A simple framework was postulated to illustrate the interrelations between texture parameters, roughness directionality and debris mobility. It was further supported by analyzing results of a closely relevant work. Although being strongly limited to the model polymer solid lubricant, this study provides perhaps some useful tools for advancing our understanding of the complex relations between roughness directionality, debris mobility (e.g., ejection, retention) and wear of polymer solid lubricant.

各种配合面粗糙度分量（即大小、密度、方向）对聚合物磨损和转移膜的影响是强耦合的，难以隔离和测试。以前的工作发现，与滑动方向垂直的反面粗糙度凹槽和脊通常有利于碎屑滞留和摩擦膜的形成，但这种效果与原位产生的平行于滑动方向的沟槽导致的碎屑滞留减少相竞争。为了进一步研究粗糙度方向性对聚合物磨损的影响，模型聚合物固体润滑剂（5 wt% Al ₂ O ₃-PTFE) 与具有平行于往复滑动方向的激光纹理凹槽和凹槽深度和密度的 2 × 3 可变矩阵相对于对应面滑动。结果发现：（1）所有纹理产生的聚合物磨损比无纹理表面更高，（2）具有最深、最密凹槽的配合面具有最高的聚合物磨损率和瞬时磨损量（磨合滑动期间的磨损量），（ 3) 浅槽纹理通常比深槽纹理产生更少的对接面和聚合物磨损，更强的摩擦膜红外特征和更连续和完整的摩擦膜。一个新的粗糙度参数（I _Ra) 被定义为一个单一的、统一的、综合的测量反面粗糙度方向性的指标。通过与之前的研究进行比较，结果发现I _Ra与聚合物瞬态磨损量之间存在普遍的相关性，并表明垂直凹槽对碎屑保留和平行凹槽对碎屑喷射的有益影响。假设了一个简单的框架来说明纹理参数、粗糙度方向性和碎片移动性之间的相互关系。分析一项密切相关的工作的结果进一步支持了它。尽管受到模型聚合物固体润滑剂的强烈限制，但这项研究可能提供了一些有用的工具，以促进我们对粗糙度方向性、碎屑流动性（例如、弹射、滞留）和聚合物固体润滑剂的磨损。