HVOF喷涂角度对NiCrBSi涂层组织结构及摩擦学性能的影响
Effects of HVOF Spraying Angle on Microstructure and Tribological Properties of NiCrBSi Coatings
杨壬涛 1高名传 1范明祯 1文可 1刘炼 1袁振南 1陈同舟1
作者信息
- 1. 中国机械总院集团武汉材料保护研究所有限公司特种表面保护材料及应用技术国家重点实验室,武汉 430030
- 折叠
摘要
采用HVOF工艺制备了 40°、50°、60°、70°、80°、90°六种不同喷涂角度的NiCrBSi涂层,对涂层微观形貌、孔隙率、显微硬度,以及25、400、600 ℃下的摩擦磨损性能进行了研究.结果表明:不同喷涂角度制备的涂层的微观结构不同,喷涂角度为40°、50°时,制备的涂层内未见未熔/半熔颗粒;喷涂角度达到60°及以上时,制备的涂层内出现未熔/半熔颗粒,且沉积效率有明显提升.涂层显微硬度在50°及90°喷涂角度时达到最大值837.2 HV0.1.同种涂层的平均摩擦因数随着试验温度的升高而降低;在常温状态下,50°喷涂角度制备的涂层磨损率最低;当磨损试验温度上升至400 ℃及600 ℃时,90°喷涂角度制备的涂层的磨损率最低.涂层在25 ℃及400 ℃下的磨损机理主要表现为疲劳磨损,在600 ℃时,90°喷涂角度制备的涂层表现出磨粒磨损特征.与喷涂角度40°制备的涂层相比,喷涂角度90°制备的涂层中的未熔/半熔颗粒起到"钉扎效应",有助于提高涂层在常温和高温环境下的耐磨性.
Abstract
Six kinds of NiCrBSi coatings with different spray angles of 40°,50°,60°,70°,80° and 90° were prepared by HVOF technology.The microstructure,porosity,microhardness,and wear properties of the coatings at 25 ℃,400 ℃ and 600 were studied.The results show that the microstructure of coatings prepared from different spraying angles id different.When the spraying angle are 40° and 50°,there are no unmelted/semi-melted particles in the coating.When the coating angle reaches 60° or above,there are unmelted/semi-melted particles in the coating,and the deposition efficiency is significantly improved.The microhardness of the coating reaches its maximum value of 837.2 HV0.1 at spray angles of 50° and 90°.The average friction coefficient of the same coating decreases with the increase of test temperature.At room temperature,the wear rate of the 50° spray coating is the lowest.When the wear test temperature rises to 400 ℃ and 600 ℃,the wear rate of the 90° spray coating is the lowest.The wear mechanism of the coating at temperatures of 25 ℃ and 400 ℃ is mainly manifested as fatigue wear,and at 600 ℃,the 90° spray coating exhibits abrasive wear characteristics.Compared with the coating prepared by the spraying angle of 40°,the unmelted/semi-melted particles in the coating prepared by the spraying angle of 90° play a"pinning effect",which helps to improve the wear resistance of the coating both at room temperature and high temperature environments.
关键词
喷涂角度/NiCrBSi涂层/高温磨损Key words
spraying angle/NiCrBSi coating/high temperature wear引用本文复制引用
基金项目
国家自然科学基金资助项目(52105203)
出版年
2024
NETL
NSTL
万方数据