The effect of intrinsic parameters on the critical load as measured with the scratch test method
The effect of intrinsic parameters on the critical load as measured with the scratch test method
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DOI：
10.1016/s0257-8972(00)01097-5
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发表时间：
2001-03-15
影响因子：
5.4
通讯作者：
Frankel, CH
中科院分区：
文献类型：
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作者：
Randall, NX;Favaro, G;Frankel, CH
在划痕测试方法中，使用金刚石压头（通常为洛氏 C 型材）在涂层样品上产生划痕，该压头在恒定或逐渐增加的负载下在表面上划过。样品以恒定速度移动，并且在一定负载下沿着划痕路径发生损坏。该临界载荷值 L-c 可用于准确表征涂层-基材系统的粘合强度。使用现代划痕测试仪器，可以通过声发射、光学显微镜、穿透深度的变化或尖端与样品之间的切向摩擦力的变化来确定临界载荷。然而，由于临界载荷取决于与测试条件相关的几个参数，因此很难以定量的方式表达涂层-基材系统的附着力。划痕测试的经验表明，为了充分表征现代薄膜和涂层的附着力，通常需要各种不同半径的金刚石压头。涂层厚度的不断减小以及更软（聚合物）涂层的发展意味着需要一系列的压头几何形状来覆盖划痕测试测量的弹性和塑性性能的范围。本文考虑了划痕速度、加载速率和金刚石压头半径等内在参数对在各种不同涂层-基体组合（TiN、W、DLC、Al 和 Au）上进行的划痕测试所测得的临界载荷的影响。结果表明临界载荷和压头半径之间存在明确的相关性，并且可以帮助用户针对给定的涂层-基材系统正确选择压头。 (C) 2001 Elsevier Science B.V. 保留所有权利。
In the scratch test method, scratches are generated on the coated sample using a diamond indenter (usually a Rockwell C profile) which:is drawn across the surface under either constant or progressively increasing load. The sample is displaced at constant speed and at a certain load damage occurs along the scratch path. This value of critical load, L-c, can be used to accurately characterise the adhesive strength of the coating-substrate system. With modern scratch testing instruments, the critical load can be determined by acoustic emission, optical microscopy, variation in penetration depth or variation in the tangential frictional force between tip and sample. However, it is difficult to express the adherence of a coating-substrate system in a quantitative way because the critical load depends on several parameters related to the testing conditions. Experience in the scratch testing held has shown that various different radii of diamond indenter are often required in order to adequately characterise the adhesion of modern thin films and coatings. The constant reduction in thickness of coatings, as well as the increase in development of softer (polymeric) coatings has meant that a whole range of indenter geometries are needed to cover the scope of elastic and plastic properties measured by scratch testing. This paper considers the effect of intrinsic parameters such as scratching speed, loading rate and diamond indenter radius on the measured critical load for scratch tests performed on various different coating-substrate combinations (TiN, W, DLC, Al and Au). Results are presented which suggest definite correlations between critical load and indenter radius,,and which should aid users in making the right choice of indenter for a given coating-substrate system. (C) 2001 Elsevier Science B.V. All rights reserved.