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Recent studies on the application of microfabrication technologies for improving tribological properties

The relationships between nanometer‐scale surface textures of periodic asperity arrays and friction force in unlubricated conditions and the relationships between micrometer‐scale surface textures of two‐tier structures and friction force in mixed lubrication conditions were investigated. The friction force and pull‐off force were measured on the asperity array in an unlubricated condition. Each force was proportional to the radius of the curvature of the asperity peak. The pull‐off force was determined by the Laplace pressure of the capillary condensed water. The friction force was measured on the micrometer‐scale surface textures of a two‐tier structure in lubricated conditions. The friction coefficient increased with higher bearing characteristic numbers at the higher B, though the friction coefficient was constant at the lower B. The roughness of the pin surface and the geometry of the two‐tier structure affected the friction coefficient at the lower B and higher B, respectively. Copyright © 2010 John Wiley & Sons, Ltd.