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Yin J, Lai C, Zhang X, Zhang L, Wang X, Wang X, Deng Z, Zhuo X, He B, Deng L. Microstructural and columnar growth characteristics of 7YSZ thermal barrier coatings fabricated by plasma spray physical vapor deposition. Ann Ital Chir 2021. [DOI: 10.1016/j.jeurceramsoc.2021.09.008] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Luo C, Gu J, Xu X, Ma P, Zhang H, Ren X. Impact of solid particles on cavitation behaviors and laser-induced degradation in aqueous suspension. ULTRASONICS SONOCHEMISTRY 2021; 76:105632. [PMID: 34166984 PMCID: PMC8227826 DOI: 10.1016/j.ultsonch.2021.105632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/17/2021] [Revised: 06/09/2021] [Accepted: 06/12/2021] [Indexed: 06/13/2023]
Abstract
A method for degrading organic pollutants in suspension by applying laser-induced cavitation is presented. Cavitation bubbles are produced remotely by laser beams, achieving a purpose of non-contact degradation. In this work, laser-induced bubble dynamics in SiO2 sand suspension were studied by high-speed imaging. Pulsating characteristics of cavitaiton bubbles in the infinite domain and near a solid boundary were investigated among various laser energies and sand concentrations. Furthermore, the extent of degradation after processing in suspension and the mechanism were analyzed. Results indicate that solid particles in the liquid medium reduce the extent of degradation. However, the extent of degradation may rebound at a proper sand concentration. In addition, compared to several small bubbles in a bubble string (in the infinite domain), a single larger bubble (near a solid boundary) has a much higher degradation ability.
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Affiliation(s)
- Chunhui Luo
- Jiangsu University, No. 301 Xuefu Road, Zhenjiang, Jiangsu 212013, People's Republic of China
| | - Jiayang Gu
- Jiangsu University, No. 301 Xuefu Road, Zhenjiang, Jiangsu 212013, People's Republic of China
| | - Xinchao Xu
- Jiangsu University, No. 301 Xuefu Road, Zhenjiang, Jiangsu 212013, People's Republic of China
| | - Pingchuan Ma
- Jiangsu University, No. 301 Xuefu Road, Zhenjiang, Jiangsu 212013, People's Republic of China
| | - Hongfeng Zhang
- Jiangsu University, No. 301 Xuefu Road, Zhenjiang, Jiangsu 212013, People's Republic of China
| | - Xudong Ren
- Jiangsu University, No. 301 Xuefu Road, Zhenjiang, Jiangsu 212013, People's Republic of China.
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Hou G, Ren Y, Zhang X, Dong F, An Y, Zhao X, Zhou H, Chen J. Cavitation erosion mechanisms in Co-based coatings exposed to seawater. ULTRASONICS SONOCHEMISTRY 2020; 60:104799. [PMID: 31563793 DOI: 10.1016/j.ultsonch.2019.104799] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Revised: 07/21/2019] [Accepted: 09/15/2019] [Indexed: 06/10/2023]
Abstract
The cavitation erosion (CE) of most materials in seawater is more serious than in fresh water due to the onset of corrosion; however, in a previous study we reported results that contradict this widely accepted trend. In this research our objective is to provide fundamental insight into the mechanisms that may be responsible for these earlier results. To accomplish this objective, two types of Co-based coatings, prepared by high velocity oxygen fuel (HVOF) spraying system, were used to further investigate the underlying corrosion-mitigating CE mechanism in seawater. Accordingly, the influence of spraying parameters on microstructure, composition and mechanical properties of the coatings was analyzed on the basis of SEM, XRD, Raman spectroscopy, Vicker's hardness and nano-indentation results. Electrochemical corrosion tests were used to evaluate the corrosion behavior of the Co-based coatings. Their CE performances in seawater and deionized water were comparatively studied by a vibratory apparatus. Results demonstrated that a higher flame temperature facilitated the oxides formation with associated improvements in compactness, hardness and toughness of the coatings. The presence of alumina in combination with the oxides formed in-situ facilitated the formation of an oxidation film on surfaces, and effectively enhanced the charge transfer resistance of the coating, thereby significantly improving the corrosion resistance in seawater. Metallic Co was not only more easily oxidized but also more readily corroded than the alloyed Co. Compactness was identified as an important factor affecting CE resistance of coatings in deionized water, because defects facilitate the nucleation and eventual collapse of bubbles. Moreover, bubble collapse produced a transient high temperature spike in excess of 600 °C that also caused Co and Cr elements to oxidize. Because the CE tests were carried out in seawater, additional Co3O4 and Cr2O3 were generated owing to corrosion that more effectively increased the surface compactness and mechanical properties of the coatings. This behavior was particular notable for coatings with metallic Co and Cr, which should be why seawater corrosion could weaken the CE of Co-based coatings.
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Affiliation(s)
- Guoliang Hou
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Yi Ren
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; School of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, China
| | - Xiaoliang Zhang
- School of Materials Science and Engineering, Hebei University of Engineering, Handan 056038, China
| | - Fengxia Dong
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Yulong An
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Xiaoqin Zhao
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Huidi Zhou
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Jianmin Chen
- State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China; Center of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
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Qiao X, Chen R, Zhang H, Liu J, Liu Q, Yu J, Liu P, Wang J. Outstanding cavitation erosion resistance of hydrophobic polydimethylsiloxane‐based polyurethane coatings. J Appl Polym Sci 2019. [DOI: 10.1002/app.47668] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Xingnian Qiao
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of EducationHarbin Engineering University Harbin 150001 China
- College of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001 China
| | - Rongrong Chen
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of EducationHarbin Engineering University Harbin 150001 China
- College of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001 China
- Institute of Advanced Marine MaterialsHarbin Engineering University 150001, China
| | - Hongsen Zhang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of EducationHarbin Engineering University Harbin 150001 China
| | - Jingyuan Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of EducationHarbin Engineering University Harbin 150001 China
- College of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001 China
| | - Qi Liu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of EducationHarbin Engineering University Harbin 150001 China
- College of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001 China
| | - Jing Yu
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of EducationHarbin Engineering University Harbin 150001 China
- College of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001 China
| | - Peili Liu
- Institute of Advanced Marine MaterialsHarbin Engineering University 150001, China
| | - Jun Wang
- Key Laboratory of Superlight Materials and Surface Technology, Ministry of EducationHarbin Engineering University Harbin 150001 China
- College of Materials Science and Chemical EngineeringHarbin Engineering University Harbin 150001 China
- Institute of Advanced Marine MaterialsHarbin Engineering University 150001, China
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Abstract
Ceramic coating is an effective method for improving the erosion resistance of a material, particularly for titanium alloys. In this study, a TiN/ZrN (ceramic/ceramic) nanoscale multilayer coating is designed and prepared on the Ti6Al4V titanium alloy surface by the physical vapor deposition (PVD) process. The cross-sectional microstructure and phase composition are measured using SEM and XRD, respectively. The hardness, elastic modulus, and adhesion of the coating are measured by the nano-indentation and scratch method. The erosion test is conducted at a 45° angle with 100 m/s velocity using self-developed erosion equipment. The erosion resistance mechanisms of both the substrate and the coating are revealed more intuitively through a single sand particle impact test. The results show that the erosion resistance rate of the coating is 15.5 times higher than that of the titanium alloy substrate. The damage mechanisms of material removal of the coating include crack deflection, crack branching, and succeeding interaction between them when suffering an impacting load. These cracks are started from the droplets and the stress concentrations on the coating surface during the preparation of coating. They are the primary reasons for the decrease in the erosion resistance of the coating. This research is important for the optimization of the erosion-resistant coating structure.
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