(1. 中國(guó)科學(xué)院 力學(xué)研究所，北京100190；
2. 中國(guó)科學(xué)院研究生院，北京100049)
摘 要: 重載作用下，類金剛石(DLC)薄膜直接應(yīng)用于鋁合金等軟金屬基體上易發(fā)生脆性破裂和剝離而導(dǎo)致過(guò)早失效。針對(duì)這一問(wèn)題，以PEO陶瓷層作為承載層，采用有限元數(shù)值計(jì)算方法，對(duì)復(fù)合涂層在均布接觸載荷作用下的應(yīng)力場(chǎng)進(jìn)行研究。結(jié)果表明：陶瓷層可明顯降低DLC膜的表面拉應(yīng)力和界面剪應(yīng)力，起到了良好的載荷支撐作用；陶瓷層厚度對(duì)涂層表面拉應(yīng)力、界面及基體內(nèi)剪應(yīng)力的分布有顯著影響，其中陶瓷層厚度與接觸半寬比為0.15~0.30時(shí)，涂層可以獲得較為合理的表面和界面應(yīng)力場(chǎng)，從而改善DLC膜在鋁合金基體上的摩擦磨損性能。
關(guān)鍵字: 鋁合金；PEO陶瓷層；DLC膜；承載層；有限元；應(yīng)力場(chǎng)
DLC films on aluminum substrate
（1. Institute of Mechanics, Chinese Academy of Science, Beijing 100190, China;
2. Graduate University, Chinese Academy of Science, Beijing 100049, China）
Abstract:Under heavy load, DLC film that directly applies to such soft metal substrates as aluminum alloy are prone to premature failure caused by brittle fracture and stripping. To solve this problem, PEO ceramic layer was made as a bearer layer, and the stress field of the composite coating subjected to uniform contact load was investigated by finite element method(FEM). The results show that the surface tensile stress and interface shear stress of the diamond-like carbon(DLC) film are obviously reduced by the ceramic layer, which plays a good supporting role in the load. Meanwhile, the surface tensile stress and the shear stress are significantly affected by the thickness of ceramic layer. While the ratio of ceramic layer thickness to contact radius is 0.15−0.30, more reasonable stress fields at surface and interfaces can be got, thereby the friction and wear properties of the DLC film on aluminum substrate are improved.
Key words: aluminum alloy; PEO ceramic layer; DLC films; bearer layer; finite element; stress field
