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首页> 外文期刊>Tribology International >Surface stresses in coated steel surfaces - influence of a bond layer on surface fracture
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Surface stresses in coated steel surfaces - influence of a bond layer on surface fracture

机译：涂层钢表面的表面应力-粘结层对表面断裂的影响

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摘要

Thin hard coatings in the thickness range of only a few micrometers deposited by physical vapour deposition (PVD) on components or tools can improve the friction and wear properties by several orders of magnitude. A 2μm thick TiN (E = 300 GPa) coating on a high-speed steel substrate with a bond layer at the interface between the coating and the substrate was modelled by micro-level three-dimensional finite-element method (3D FEM) in order to optimise a coated surface with regard to coating fracture. Both compliant low modulus (E= 100 GPa) and stiff high modulus (E = 500 GPa) bond layers at the coating/substrate interface of 200 and 500 nm thickness were investigated. First principal stresses were simulated for scratch test geometry in the load range of 7.5-15 N. Very high stress concentrations of above 5700 MPa tensile stresses were observed in the bond layer just behind the contact zone for the stiffer bond layer. The stiff bond layer generated 5 times higher tensile stress maxima compared to the compliant bond layer. There was approximately 3.5 times larger strain in the compliant bond layer compared to the stiff bond layer. The general coating design advice based on this exercise is that when a bond layer is used e.g. for coating/substrate adhesion improvement should the bond layer be less stiff than the coating not to generate high and critical tensile stresses. The thickness of the bond layer may vary and is not critical with respect to generated stresses in the surface.
机译：通过物理气相沉积（PVD）在部件或工具上沉积的厚度仅为几微米的薄硬涂层可以将摩擦和磨损性能提高几个数量级。通过微型三维有限元方法（3D FEM）依次对高速钢基底上具有2μm厚的TiN（E = 300 GPa）涂层和涂层与基底之间的界面处的粘结层进行建模。在涂层断裂方面优化涂层表面。研究了在200和500 nm厚度的涂层/基材界面处的顺应性低模量（E = 100 GPa）和刚性高模量（E = 500 GPa）粘结层。模拟了在7.5-15 N的载荷范围内的划痕测试几何形状的第一主应力。在刚硬的粘结层接触区后面的粘结层中观察到非常高的应力集中，高于5700 MPa的拉伸应力。刚性粘结层产生的拉伸应力最大值是柔顺粘结层的5倍。与刚性粘结层相比，柔性粘结层的应变大约大3.5倍。基于此练习的一般涂料设计建议是，当使用粘结层时，例如为了改善涂层/基材的粘合性，应使粘合层的硬度小于涂层的硬度，以免产生高的临界拉伸应力。粘结层的厚度可以变化，并且对于表面中产生的应力而言并不关键。

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