Study on the Evaluation of Coating Adhesion and Strength of Metal Coated with Ceramic Thin Film

陶瓷薄膜金属镀层附着力及强度评价研究

基本信息

批准号：
03650060
负责人：
SHIOZAWA Kazuaki
金额：
$ 1.28万
依托单位：
TOYAMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650060/
关键词：
TiN PVD CVD Thin Film Fatigue Strength Adhesion,Flaw Crack Initiation き裂発生

项目摘要

The ceramic coating for various kinds of machine components improves the wear resistance, heat resistance, cutting ability or corrosion resistance. Coating technology on metals will be utilized more widely for various kinds of machine components and structures which require high functional properties. The aim of this investigation is to clarify the coating adhesion, strength of thin film and the effect of hard thin film coated on the fatigue behavior of metals. Scratch test, static tensile test, residual stresses measurement in film by the X-ray method, and load-controlled high-cycle and strain controlled low-cycle fatigue tests were conducted, using specimen of 0.37% carbon steel coated with TiN by physical vapor diposition (PVD) and chemical vapor diposition (CVD) methods. Main conclusions obtained in this study are as follows:1. The scratch adhesion of TiN film coated by PVD is higher than that coated by CVD. Coating failure modes in the scratch test are different in each other; PVD … More film is failed by chipping as a result of the bending of film and CVD film is spalled by buckling.2. From the static tensile tests, it was found that flaws on PVD and CVD coating films occurred at the total tensile strains of 0.40% and 0.87%, respectively, and that they increased with the strain. It has been shown that scratch adhesion and fracture of coating film under tensile strain does not share any features.3. The fatigue life of specimens coated is affected by the applied stress ratio and the strain amplitude level. This is due to the crack initiation behavior in the substrate induced by the rupture of the coating film. The fatigue life of coated specimen decreased as compared with that of an uncoated one, if coating film fails during fatigue process as the results of fatigue damage of film itself or accumulation of plastic deformation of substrate metal. Many cracks were induced at the substrate by flaws in the coating film. The increase in fatigue strength of the coated specimen was observed under the region of low total strain amplitude and under the stress ratio of -1, because crack initiation was delayed by the hard coating film on the specimen surface which acted as a barrier to the egress of dislocations.4. The rotating bending fatigue tests were conducted in air and in 3.0% NaCl solution using the pre-flawed coating specimens. The fatigue life of pre-flawed coating specimen remarkably decreased as compared with that of an uncoated specimen. It was explained by the observation of fracture surface and the estimation of fatigue life based on the small fatigue crack propagation law that many cracks occured along the flaw of film are coalesced in each other and grow to large one crack at the early stage of fatigue process. Less

用于各种机器组件的陶瓷涂层可提高耐磨损，耐热性，切割能力或耐腐蚀性。金属上的涂料技术将更广泛地用于需要高功能性能的各种机器组件和结构。这项研究的目的是阐明涂层粘合剂，薄膜的强度以及涂覆的硬薄膜对金属疲劳行为的影响。使用0.37％的碳钢通过物理蒸气（PVD）和化学蒸发型（CVD）方法（CVD）方法，进行了刮擦测试，静态拉伸测试，X射线方法中的X射线应力测量，以及通过X射线控制和应变控制的高周期和应变控制的高周期疲劳测试。在本研究中获得的主要结论如下：1。 PVD覆盖的TIN膜的刮擦粘合剂高于CVD涂层的粘合剂。划痕测试中的涂料失败模式在彼此之间是不同的。 PVD…由于电影的弯曲和CVD电影的弯曲而导致更多的电影失败了。2。从静态拉伸测试中，发现PVD和CVD涂层膜上的缺陷分别以0.40％和0.87％的总拉伸菌株发生，并且随着菌株而增加。已经表明，在拉伸应变下涂层膜的刮擦粘合剂和断裂没有任何特征。3。涂层标本的疲劳寿命受施加的应力比和应变放大器水平的影响。这是由于涂料膜破裂引起的底物的裂纹起始行为。如果涂层膜在疲劳过程中失败，则涂层标本的疲劳寿命会降低，因为膜本身的疲劳损伤或底物金属的塑性变形的累积结果。涂料膜中的缺陷在基板上诱导了许多裂缝。在低总应变放大器的区域和-1的应力比下观察到涂层规格的疲劳强度的增加，因为裂纹启动被固定表面上的硬涂层延迟，这是脱位出口的障碍。4。与未涂层试样相比，使用预易涂的涂层涂层的疲劳寿命明显降低，在空气中和3.0％NaCl溶液中进行了旋转弯曲疲劳试验。这是通过观察断裂表面的观察和基于小疲劳裂纹传播定律的疲劳寿命的估计来解释的，沿膜的缺陷发生了许多裂缝，并在疲劳过程的早期阶段彼此合并，并长到一个大裂纹。较少的