Bo Cheng , Guangbin Zheng , Dong Hou , Chengyun Ding , Qianqian Chu , Li Feng , Guosheng An , Xinjian Zhang , Lan Sun , Haoteng Sun , Wensheng Li
{"title":"具有优异CMAS耐蚀性的Gd2Zr2O7陶瓷涂层柱状/致密结构的形成机理","authors":"Bo Cheng , Guangbin Zheng , Dong Hou , Chengyun Ding , Qianqian Chu , Li Feng , Guosheng An , Xinjian Zhang , Lan Sun , Haoteng Sun , Wensheng Li","doi":"10.1016/j.corsci.2025.113348","DOIUrl":null,"url":null,"abstract":"<div><div>Corrosion failure induced by calcium-magnesium-alumina-silicate (CMAS) deposits represents a predominant degradation mechanism in advanced thermal barrier coatings (TBCs) systems. In this study, a laser-based surface modification strategy was systematically investigated to reconfigure the microstructure of air plasma spray (APS) Gd₂Zr₂O₇ (GZO) coatings, with the aim of enhancing their resistance to CMAS corrosion. Numerical simulations revealed that laser power dictates microstructural transformations: a fully dense layer forms near the surface at 8 W; in contrast, at 12 W, honeycomb-like crystals are first nucleate at the bottom of the melt pool and grow upward, exhibiting a slight orientation bias in the laser scanning direction. Subsequently, a micro-columnar structure develops in the middle and upper regions of the melt pool. A parameter combination (laser power: 14 W, scan speed: 100 mm/s, line spacing: 0.02 mm, spot diameter: 0.5 mm) was selected to fabricate a hybrid surface texture, which consists of vertically aligned micro-columns (∼10 μm) atop a dense subsurface layer (∼15 μm). The resulting micro columnar and micro-nanocomposite structure conferred superior CMAS corrosion resistance, which is attributable to reduced CMAS wettability on the coating surface and limited CMAS infiltration into the coating interior. The synergistic effects of surface texturing and subsurface structural engineering provide new insights into the design of the corrosion-resistant TBCs via laser-induced phase-selective recrystallization.</div></div>","PeriodicalId":290,"journal":{"name":"Corrosion Science","volume":"257 ","pages":"Article 113348"},"PeriodicalIF":7.4000,"publicationDate":"2025-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Formation mechanisms of columnar/dense structure for Gd2Zr2O7 ceramics coatings with superior CMAS corrosion resistance\",\"authors\":\"Bo Cheng , Guangbin Zheng , Dong Hou , Chengyun Ding , Qianqian Chu , Li Feng , Guosheng An , Xinjian Zhang , Lan Sun , Haoteng Sun , Wensheng Li\",\"doi\":\"10.1016/j.corsci.2025.113348\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Corrosion failure induced by calcium-magnesium-alumina-silicate (CMAS) deposits represents a predominant degradation mechanism in advanced thermal barrier coatings (TBCs) systems. In this study, a laser-based surface modification strategy was systematically investigated to reconfigure the microstructure of air plasma spray (APS) Gd₂Zr₂O₇ (GZO) coatings, with the aim of enhancing their resistance to CMAS corrosion. Numerical simulations revealed that laser power dictates microstructural transformations: a fully dense layer forms near the surface at 8 W; in contrast, at 12 W, honeycomb-like crystals are first nucleate at the bottom of the melt pool and grow upward, exhibiting a slight orientation bias in the laser scanning direction. Subsequently, a micro-columnar structure develops in the middle and upper regions of the melt pool. A parameter combination (laser power: 14 W, scan speed: 100 mm/s, line spacing: 0.02 mm, spot diameter: 0.5 mm) was selected to fabricate a hybrid surface texture, which consists of vertically aligned micro-columns (∼10 μm) atop a dense subsurface layer (∼15 μm). The resulting micro columnar and micro-nanocomposite structure conferred superior CMAS corrosion resistance, which is attributable to reduced CMAS wettability on the coating surface and limited CMAS infiltration into the coating interior. The synergistic effects of surface texturing and subsurface structural engineering provide new insights into the design of the corrosion-resistant TBCs via laser-induced phase-selective recrystallization.</div></div>\",\"PeriodicalId\":290,\"journal\":{\"name\":\"Corrosion Science\",\"volume\":\"257 \",\"pages\":\"Article 113348\"},\"PeriodicalIF\":7.4000,\"publicationDate\":\"2025-09-21\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Corrosion Science\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0010938X25006766\",\"RegionNum\":1,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"MATERIALS SCIENCE, MULTIDISCIPLINARY\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Corrosion Science","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0010938X25006766","RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}
Formation mechanisms of columnar/dense structure for Gd2Zr2O7 ceramics coatings with superior CMAS corrosion resistance
Corrosion failure induced by calcium-magnesium-alumina-silicate (CMAS) deposits represents a predominant degradation mechanism in advanced thermal barrier coatings (TBCs) systems. In this study, a laser-based surface modification strategy was systematically investigated to reconfigure the microstructure of air plasma spray (APS) Gd₂Zr₂O₇ (GZO) coatings, with the aim of enhancing their resistance to CMAS corrosion. Numerical simulations revealed that laser power dictates microstructural transformations: a fully dense layer forms near the surface at 8 W; in contrast, at 12 W, honeycomb-like crystals are first nucleate at the bottom of the melt pool and grow upward, exhibiting a slight orientation bias in the laser scanning direction. Subsequently, a micro-columnar structure develops in the middle and upper regions of the melt pool. A parameter combination (laser power: 14 W, scan speed: 100 mm/s, line spacing: 0.02 mm, spot diameter: 0.5 mm) was selected to fabricate a hybrid surface texture, which consists of vertically aligned micro-columns (∼10 μm) atop a dense subsurface layer (∼15 μm). The resulting micro columnar and micro-nanocomposite structure conferred superior CMAS corrosion resistance, which is attributable to reduced CMAS wettability on the coating surface and limited CMAS infiltration into the coating interior. The synergistic effects of surface texturing and subsurface structural engineering provide new insights into the design of the corrosion-resistant TBCs via laser-induced phase-selective recrystallization.
期刊介绍:
Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies.
This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.