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Thermal barrier coating system towards high strain tolerance and sintering resistance: design, manufacturing, and characterization

实现高应变耐受性和耐烧结性的热障涂层系统：设计、制造和表征

基本信息

批准号：
392167322
负责人：
Professor Dr. Robert Vaßen
金额：
--
依托单位：
National Natural Science Foundation of China
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2018
资助国家：
德国
起止时间：
2017-12-31 至 2021-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/392167322?language=en
关键词：
Thermal barrier coating system towards

项目摘要

As a novel coating deposition method for thermal barrier coating (TBC), suspension plasma spraying (SPS) takes advantages of conventional air-plasma spraying and vapor deposition technologies, by combining porous with columnar microstructure. Moreover, using suspension feedstock facilitates the employment of nano-sized powder, which leads to an ultra-fine microstructure. Combing these microstructure features, graded or multilayered SPS TBC is a potential candidate for multi-functional applications. However, few systematic studies on multi-functional SPS TBC have been reported in literature.According to our previous investigations, various microstructures, e.g. columnar and vertically cracked structures, can be fabricated by adjusting spraying parameters. In the columnar microstructure, relatively high porosity and crack density is beneficial to prolong thermal cycling life, owing to the high strain tolerance. By reducing the vertical crack density, sufficient corrosion resistance by avoiding the penetration of molten oxides deposited from inlet gas can be achieved. With tailored porosity, diffusion controlled sintering process may be suppressed. In principle, deposited by adjusting spraying parameters, structurally graded SPS TBC will provide multiple functions at low cost.In this project, the design method and manufacturing roadmap for structurally graded SPS TBC using yttria stabilized zirconia (YSZ) will be established, based on relationships between spraying parameter, microstructure and mechanical property. Microstructural and mechanical evolutions will be characterized by thermal shock, hot corrosion and sintering processes, using high-resolution microscopy / tomography and in-situ measurements. Degradation and failure mechanisms will be elucidated through finite element method, with a coupling constitutive model and multi-cracking algorithm employed. Based on experimental and numerical results, evaluation criteria and optimized microstructure design will be proposed for multi-functional performances in quasi-service condition. The completion of the project will provide further insights on the structure-dependent degradation mechanisms and lay foundation to the integration of various microstructures for multiple functions. Furthermore, the concept of microstructure design will inspire the application of advanced TBCs using new compositions beyond YSZ.

悬浮等离子喷涂（SPS）作为一种新型热障涂层（TBC）涂层沉积方法，利用了传统空气等离子喷涂和气相沉积技术的优点，将多孔与柱状微观结构相结合。此外，使用悬浮液原料有利于纳米粉末的使用，从而产生超细的微观结构。结合这些微观结构特征，分级或多层 SPS TBC 是多功能应用的潜在候选者。然而，文献报道的多功能SPS TBC的系统研究还很少。根据我们之前的研究，各种微观结构，例如：可以通过调整喷涂参数来制造柱状和垂直裂纹结构。在柱状微观结构中，由于较高的应变耐受性，相对较高的孔隙率和裂纹密度有利于延长热循环寿命。通过降低垂直裂纹密度，可以避免入口气体沉积的熔融氧化物的渗透，从而获得足够的耐腐蚀性。通过定制孔隙率，可以抑制扩散控制的烧结过程。原则上，通过调整喷涂参数沉积，结构梯度SPS TBC将以低成本提供多种功能。在本项目中，将基于喷涂参数、微观结构和力学性能之间的关系，建立使用氧化钇稳定氧化锆（YSZ）的结构梯度SPS TBC的设计方法和制造路线。使用高分辨率显微镜/断层扫描和原位测量，微观结构和机械演化的特点是热冲击、热腐蚀和烧结过程。将通过有限元方法，采用耦合本构模型和多重裂纹算法来阐明退化和失效机制。基于实验和数值结果，将提出准服役条件下多功能性能的评价标准和优化的微观结构设计。该项目的完成将为结构依赖性降解机制提供进一步的见解，并为多种功能的各种微结构的集成奠定基础。此外，微观结构设计的概念将激发使用 YSZ 之外的新成分的先进 TBC 的应用。