Research Progress of the Sealant Decreased Thermal Spray Coating Porosity
WANG Haozhen1,2, ZHOU Xinyuan2, LIU Ming2,*, JIA Lei1,*, HUANG Yanfei2, WANG Haidou2,3
1 School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710072, China 2 National Key Laboratory for Remanufacturing, Academy of Army Armored Forces, Beijing 100072, China 3 National Engineering Research Center for Remanufacturing, Academy of Army Armored Forces, Beijing 100072, China
Abstract: As one of the key supporting technology of surface and remanufacturing engineering, thermal spraying technology integrates the preparation of surface protective coatings and the repair of metal components to meet the requirements of wear resistance, corrosion resistance, thermal barrier, electric conduction, catalysis, biological activity and so on. It has wide application prospect in aerospace, aviation, petrochemical industry, transportation and other industrial fields, and thermal spraying technology is an indispensable high-value-added manufacturing technology for high-end equipment manufacturing. Research shows that the thermal spray coating formed by the accumulation of countless spray particle inevitably has structural defects (pores, cracks). However, with the requirements for the performance of equipment continue to increase, the working conditions of coatings tend to be more severe. On the one hand, the complex structural defects in the coating restrict the reliability of the equipment by affecting the comprehensive properties of the coating, such as mechanical properties and wear resistance; on the other hand, air, water, ions and other corrosive media can pass through open pores. It directly corrodes the substrate and causes the coating to fall off, limiting the life of the equipment. Therefore, domestic and foreign scholars are devoted to the research on the post-treatment of thermal spray coating. In the actual production process, the sealant has the significant advantages of technology, economy and versatility, so it is widely used in the post-treatment of thermal spray coatings. Among them, organic sealant generally has stable chemical properties and better penetration ability, which can effectively close most of the open pores in the coating, block corrosion channels, and significantly improve the corrosion resistance of the coating. The inorganic sealant ge-nerally has a larger curing shrinkage rate, and the surface of the sealed coating is prone to cracks, resulting in its sealed effect being lower than that of the organic sealing agent. However, the thermal sprayed coating sealed by inorganic sealant has excellent high temperature resistance, mechanical properties and wear resistance. In this paper, on the basis of analysing the formation mechanism of pores in thermal spray coatings and the influence of pores on the service performance of coatings, various sealant used in the sealing treatment of thermal spray coatings are introduced. Corrosion resistance and wear resistance of thermal spray coatings sealed with various sealant are comprehensively compared. The advantages and disadvantages of each sea-lant impregnation process are summarized, and the important problems existing in the sealing treatment technology of the sealant and the future development direction are pointed out.
通讯作者:
*刘明,中国人民解放军陆军装甲兵学院装备再制造技术国防科技重点实验室助理研究员。2001年7月本科毕业于陆军装甲兵学院,2018年12月在陆军装甲兵学院装备保障与再制造系取得博士学位。长期从事表面涂层、等离子喷涂方面的研究工作,先后主持或参与国家级及军队级科研项目10余项,其中主持装发预研重点基金项目1项、武器装备预研基金项目2项,获军队科技进步二等奖2项。授权国家(国防)发明专利20余项,发表论文40余篇。hzaam@163.com 贾磊,西安理工大学材料科学与工程学院教授、硕士研究生导师。2012年博士毕业于西安理工大学材料科学与工程专业,随后留校任教。主要从事金属基复合材料、先进陶瓷材料的制备、相变行为与强韧化机理研究。近年来在材料科学领域发表论文30余篇,包括Journal of Alloys and Compounds、Materials Characterization、Materials Science and Engineering A、Journal of Materials Science等。xautjialei@hotmail.com
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