In-situ tensile testing of crystalline diamond coatings using Raman spectroscopy
In-situ tensile testing of crystalline diamond coatings using Raman spectroscopy
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DOI：
10.1016/j.surfcoat.2009.04.030
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发表时间：
2009-12-25
影响因子：
5.4
通讯作者：
Goeken, Mathias
中科院分区：
文献类型：
--
作者：
Ahmed, Furqan;Durst, Karsten;Goeken, Mathias
利用显微拉曼光谱研究了钛基金刚石薄膜在原位拉伸载荷下的断裂行为。采用热灯丝化学气相沉积技术在薄钛箔上沉积了金刚石薄膜。利用拉曼光谱仪进行的原位研究表明，拉伸载荷的施加可以降低初始为压应力的内应力。在较高的应变值下，当内应力具有拉伸性质时，在涂层中形成裂纹，在较高的应变下裂纹间距减小，并且在开裂期间拉伸应力保持恒定。横截面分析，穿过拉伸裂纹。用聚焦离子束显微镜观察表明，裂纹从涂层表面开始，然后扩展到夹层中，在金属基底的表面停止，并在进一步应变时张开而没有分层。这种开裂行为表明涂层与基材的良好粘附性。(C)2009爱思唯尔有限公司版权所有。
In the present work, the fracture behaviour of crystalline diamond thin films on titanium substrate has been studied under uniaxial in-situ tensile loading in Micro-Raman spectroscopy. Thin crystalline diamond films were deposited onto thin titanium foils using a hot filament chemical vapour deposition technique. The in-situ investigations in Raman spectroscope indicated that the internal stresses, which were compressive at the beginning, can be reduced by the application of tensile load. At higher strain values, when internal stresses were of tensile nature, cracks were formed in the coating with reduced crack spacing at higher strains and also the tensile stress stayed constant during cracking. Cross-section analyses, across tensile cracks. with a focused ion beam microscopy showed that the crack starts from the surface of the coating, then propagates into the interlayer, stops at the surface of the metallic substrate and opens up on further straining without delamination. This cracking behaviour indicates a good adhesion of the coating to the substrate. (C) 2009 Elsevier B.V. All rights reserved.