考慮表面粗度、表面變形、塗層硬度與黏附之碎形微接觸模式及其對精密機械磨損性能的應用研究

Fractal Contact Models and Wear Performance Study of Precision Machine in Considering of Surface Roughness, Surface Deformation, Coating Hardness and Adhesion

黃克仲(Ko-Chung Huang)

國立虎尾科技大學/工程學院/動力機械工程研究所/碩士(2005年)

摘要

相對表面間之接觸特性是研究界面磨擦、磨損、潤滑、磨擦熱、密封性、
熱阻與電阻最主要的因子之一。本文利用表面形貌的碎性特性研究界面間之
接觸性能與微磨損現象，建立兩個新的粗糙表面微接觸模式，並利用此模式
決定預測微機械使用壽命所需之磨損係數。新微接觸模式 I 比著名 MB 模式多
考慮波峰彈塑性變形與塗層之硬度效應；分析結果顯示波峰彈塑性變形是粗
糙表面接觸面積相當重要的部分，同時証明 MB 模式估計真實接觸面積在不
同粗糙參數、材料參數與外力負荷下均有過小之缺陷，因此新模式 I 對描述
粗糙表面接觸特性比 MB 模式更為完整。 MB 模式為本文新建立微接觸模式 I
的特例。
黏附現象主要發生在表面波峰尖端，一般在表面粗糙波峰降低至奈米等
級時將顯現其對界面影響的重要性，因此在微機械或精密機械之微米至奈
米波峰表面時必須考量此種效應。新微接觸模式 II 在原有的微接觸模式中加
入此種黏附效應。分析結果顯示界面黏附力將引起真實接觸面積的增加，
並且在黏附力越大，表面波峰 G* 值愈小與外力愈小時，其增加量亦增加。
基於提出之新微接觸模式，本文亦配合奈米實驗，以鑽石與鈦運動對為例，
說明如何求出產業應用所需之界面磨損性質，建立鍍層抗磨損性能之評估
方法。

並列摘要

The phenomenon of contact between two rough surfaces is of fundamental
important in the study of friction, wear, lubrication, frictional heat, seals and
thermal and electrical contact resistance. In this work, fractal characterization of
surface topography is applied to the study of contact mechanics and microwear
process. Two new models of contact between rough surfaces are developed and
they are applied to determine the wear coefficient in predicting the service life of
micro-machine. New contact model I was presented incorporating the
elastic-plastic transition deformation and hardness effects in coating film from
MB model. Results show that the elastic-plastic contact of asperities plays on
important part is contact behavior of rough surface. Large real areas of contact
are predicting by the present model I than the MB model at any given roughness
parameters, material parameters, and external loads. Based on the results
comparison and analysis, new model I is shown to be more complete than MB
model in describing the elastic-plastic contact phenomena between rough
surfaces.
Adhesion occurs at the peaks of the asperities and is pronounced When the
surface roughness effect is small, due to the nanometer level. In order to account
for the effects of asperities ranging from the nanometer to micrometer level in
micro-machine or precision machine. New model II also describes contact
behavior between rough solids using a fractal model that take into account the
effect of adhesive properties. Results show that larger real areas of contact are
predicted due to the adhesive force. Based on this study and nano test, a case
study of predicting wear properties between Ti and diamond contact pair was
conducted for industrial application.

參考文獻

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