Development of quantitative evaluation on interfacial strength for PVD coated materials.

通过各种类型的物理气相沉积(PVD)制备的陶瓷涂层被广泛应用于延长工模具材料的使用寿命，防止基材裂纹的萌生和扩展，或显著降低磨损率。许多关于涂层工艺的研究在期刊上都有报道，但很少有对这些涂层材料进行可靠的评价和力学特性的研究。这是因为很少或根本没有方法来评估涂层的机械性能以及它们在运行中随载荷和划痕的变化。即使要准确地确定涂层材料的弹性常数，显微硬度测试和弯曲测试都不能满足上述材料评估的可靠性，作者一直对材料评估声学诊断的研究和发展感兴趣。在本研究中，P-…的定量无损评价更多的VD陶瓷涂层和表面处理材料旨在实现材料表面50 nm~100 nm范围的弹性表征、涂层中残余应力分布分析以及将宏观力学性能与材料微观结构联系起来的声学均匀化方法，其关键技术是研究和开发声谱定量无损评价系统。在这项研究的最后一年，提出和发展了一种新的方法来分析PVD TiN涂层的残余应力分布，其中涂层和基准材料之间的泄漏表面波速与d/lambda(d：涂层厚度和lambda：波长)的函数的差值可以识别为残余应力分布。此外，还开发了一种新的超声测量方法来描述粉末压坯的流变特性随温度和压力的变化，并跟踪压力高达400 Mpa的粉末压坯的变形轮廓。较少

The ceramic coating by various types of physical vapor deposition (PVD) is widely utilized to prolong the life cycle of tool and die materials, to prevent substrate materials from initiation and growth of cracks, or to make significant reduction of wear rate. Many researches to progress the coating procedures have been reported anywhere in journals, but very few studies are present to make reliable evaluation and mechanical characterization of these coated materials. This is because little or no methodologies are available to assess the mechanical properties of coatings and their change with loading and scratching in operation. Even to make accurate determination of elastic constants of these coating materials, neither micro-hardness testing nor bending testing has sufficient reliability for the above materials assessment.Authors have been interested in research and development of acoustic diagnosis for materials evaluation. In this research, quantitative nondestructive evaluation of P … More VD ceramic coatings and surface treated materials is aimed to realize a base for the elastic characterization of surface structure of materials in the range from 50 nm to 100 mum, the residual stress distribution analysis in coatings and the acoustic homogenization approach to relate the macroscopic mechanical properties with the microstructure of materials, The key technology lies in the research and development of quantitative nondestructive evaluation system by the acoustic spectro-microscopy. In the final year of this research, new methodology was proposed and developed for the residual stress distribution analysis for the PVD TiN coatings where the difference of the leaky surface wave velocities between coated and reference materials in the function of d/lambda (d : coating thickness and lambda : wave length) can be identified as the residual stress distribution. Furthermore, new ultrasonic measurement methods were developed to describe the change of rheological properties with increase of temperature and pressure and to trace the deformed profile of powder compacts with pressurizing upto 400 MPa. Less