Residual stress analysis of ceramic coatings

陶瓷涂层的残余应力分析

• 批准号: 215140812
• 负责人: Professor Dr. Rainer Gadow
• 金额: --
• 依托单位: Institut für Technische Optik (ITO)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/215140812?language=en
• 关键词: Residual; stress; analysis; ceramic; coatings

Coatings are commonly applied in order to ensure functional properties (such as corrosion or wear protection, sensors) or decorative features on the surface of an object. But in many cases, layers (coatings) possess manufacturing-related residual stresses that create undesirable effects (e.g. cracking and spalling of layers), and therefore, it is essential to know the residual stresses and their effects in the composite in order to appropriately adapt the coating process. In the 1st project phase, a laser-optical method for contactless and minimally invasive measurement of surface residual stresses, based on a laser ablation process with coupled digital holographic interferometry, has been developed and validated. Based on the results of the 1st project phase, the objective of the project (2nd project phase) now consists of the real-time in-situ determination of residual stresses (i.e. measurement of temporary stresses during the ongoing process) by contactless online measurement. Thereby, new knowledge of the coating process is to be achieved, as well as the possibility to create an in-line process control to ensure the desired coating properties. With the information gained and by comparison with data from process simulation, the manufacturing of coatings with a defined level of residual stresses will be possible by the control of torch trajectory (kinematics), simultaneous cooling and variation of the coating process parameters. The long-term aim of method development is the process control for selective and reproductive generation of residual stress states in layers, which were generated by means of thermal spraying processes. Moreover, the systematics developed for the determination of residual stresses by laser ablation should be extended to comparatively small objects (surface boundary influence) and cylindrical or freeform surfaces.

涂层通常用于确保物体表面的功能特性（如腐蚀或磨损保护，传感器）或装饰特征。但是在许多情况下，层（涂层）具有制造相关的残余应力，其产生不期望的效果（例如，层的开裂和剥落），因此，必须知道复合材料中的残余应力及其影响，以便适当地调整涂层工艺。在第一个项目阶段，激光光学方法的非接触和微创测量表面残余应力，激光烧蚀过程的基础上耦合数字全息干涉测量，已经开发和验证。基于项目第一阶段的结果，该项目（项目第二阶段）的目标现在包括通过非接触式在线测量实时原位确定残余应力（即在正在进行的过程中测量临时应力）。因此，将获得涂层工艺的新知识，以及创建在线工艺控制以确保所需涂层性能的可能性。利用获得的信息并与工艺模拟数据进行比较，通过控制喷枪轨迹（运动学）、同时冷却和改变涂层工艺参数，可以制造具有规定残余应力水平的涂层。方法开发的长期目标是通过热喷涂工艺在层中选择性地和再生地产生残余应力状态的过程控制。此外，系统开发的激光烧蚀残余应力的测定应扩展到相对较小的物体（表面边界的影响）和圆柱形或自由曲面。

项目成果

Non-contact residual stress analysis method with displacement measurements in the nanometric range by laser made material removal and SLM based beam conditioning on ceramic coatings

• DOI: 10.1016/j.surfcoat.2018.12.123
• 发表时间: 2019-08-15
• 期刊: SURFACE & COATINGS TECHNOLOGY
• 影响因子: 5.4
• 作者: Martinez-Garcia, V.;Pedrini, G.;Schmauder, S.
• 通讯作者: Schmauder, S.

Evaluation of Residual Stress Determinations Conducted with Laser Ablation and Optical Displacement Measurement

通过激光烧蚀和光学位移测量进行残余应力测定的评估

• DOI: 10.21741/9781945291173-55
• 发表时间: 2017
• 作者: P. Weidmann;G. Pedrini;V. Martinez-Garcia S. M. Wenzelburger;A. Killinger;S. Schmauder;R. Gadow;W. Osten
• 通讯作者: W. Osten

Residual Stress Evaluation in Ceramic Coating Under Industrial Conditions by Digital Holography

工业条件下陶瓷涂层残余应力的数字全息评估

• DOI: 10.1109/tii.2019.2939972
• 发表时间: 2019
• 期刊: IEEE Transactions on Industrial Informatics
• 影响因子: 12.3
• 作者: I. Alekseenko;G. Pedrini;V. Martínez-García;A. Mora;A. Killinger;A. Kozhevnikova;S. Schmauder;R.Gadow;W. Osten
• 通讯作者: W. Osten