Optimization of laser process parameters and improved corrosion behaviour of LZ/YSZ thermal barrier coating

IF 2.1 4区 材料科学 Q2 MATERIALS SCIENCE, CERAMICS
Ali Avcı, Muhammet Karabaş, Ayşegül Akdoğan Eker, Erhan Akman
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引用次数: 0

Abstract

Laser processing the surfaces of plasma-sprayed thermal barrier coatings is one of the methods used to improve the corrosion resistance of the coatings. However, laser glazing alone is not sufficient to fully protect coatings from corrosion. In this study, optimum laser surface modification parameters were determined for plasma-sprayed LZ/YSZ double-layer thermal barrier coatings. The coating surface, whose entire surface was scanned with optimum parameters, was modified with nano YSZ using the electrophoretic deposition technique. Thus, the network cracks formed during laser glazing were filled with nano YSZ. The coating modified by laser and electrophoretic deposition processes was subjected to corrosion tests. As a result of the characterizations, it was determined that the optimum laser surface modification parameters for LZ/YSZ thermal barrier coatings were 200 mm laser distance, 120 scan speed, and 28w laser power. With these parameters, discontinuities on the as-sprayed coating surface were eliminated. A dense layer was successfully created on the LZ layer. As a result of the corrosion tests, it was determined that modifying the laser-glazed surface with nano YSZ reduced the penetration depth of corrosive contaminants. Thus, the glassy melt and hot corrosion resistance of LZ/YSZ thermal barrier coatings was increased.

激光工艺参数优化及LZ/YSZ热障涂层腐蚀性能的改善
激光对等离子喷涂热障涂层进行表面处理是提高涂层耐腐蚀性能的方法之一。然而,激光上光本身并不足以完全保护涂层免受腐蚀。本研究确定了等离子喷涂LZ/YSZ双层热障涂层的最佳激光表面改性参数。采用电泳沉积技术对涂层表面进行修饰,并对涂层表面进行扫描,获得最佳参数。因此,激光上釉过程中形成的网状裂纹被纳米YSZ填充。对激光和电泳改性后的涂层进行了腐蚀试验。通过表征,确定了LZ/YSZ热障涂层的最佳激光表面改性参数为200 mm激光距离,120扫描速度,28w激光功率。利用这些参数,消除了喷涂后涂层表面的不连续性。在LZ层上成功创建致密层。通过腐蚀试验,确定用纳米YSZ修饰激光釉面可以降低腐蚀污染物的渗透深度。从而提高了LZ/YSZ热障涂层的玻璃化熔体和耐热腐蚀性能。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of the Australian Ceramic Society
Journal of the Australian Ceramic Society Materials Science-Materials Chemistry
CiteScore
3.70
自引率
5.30%
发文量
123
期刊介绍: Publishes high quality research and technical papers in all areas of ceramic and related materials Spans the broad and growing fields of ceramic technology, material science and bioceramics Chronicles new advances in ceramic materials, manufacturing processes and applications Journal of the Australian Ceramic Society since 1965 Professional language editing service is available through our affiliates Nature Research Editing Service and American Journal Experts at the author''s cost and does not guarantee that the manuscript will be reviewed or accepted
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