摘要
目的研究镍基陶瓷复合涂层的摩擦学性能,为现场修复泥浆泵关键部件提供实验支撑。方法采用低压冷喷涂技术,在Q235钢表面分别制备不同Al_(2)O_(3)和ZrO_(2)含量的镍基金属陶瓷复合涂层。通过HT-1000摩擦实验机测试大气气氛下涂层的摩擦磨损性能,采用X射线衍射仪(XRD)和附带能谱的扫描电镜(SEM)表征复合涂层的微观组织和物相组成,利用维氏显微硬度仪测试复合涂层硬度。结果陶瓷颗粒添加量为9%~33%(以体积分数计)时,涂层硬度随着Al_(2)O_(3)含量的增加,呈先增后减的趋势,而随着ZrO_(2)增加,涂层的硬度呈先减再增的趋势。这主要是因为不同类型陶瓷颗粒的添加使涂层的致密度发生了变化。Ni-Al_(2)O_(3)复合涂层摩擦因数随Al_(2)O_(3)含量增加,呈现先减后增的趋势,涂层磨损机理由粘着磨损向磨粒磨损转变,而Ni-ZrO_(2)复合涂层摩擦因数大致稳定在0.2附近。Ni-Al_(2)O_(3)复合涂层的磨损率随Al_(2)O_(3)含量的增加,呈现先减后增的趋势,而ZrO_(2)含量增加,Ni-ZrO_(2)复合涂层的磨损率则呈现先增后减的趋势。当加入23%Al_(2)O_(3)颗粒时,涂层的耐磨性能明显改善,摩擦因数低至0.149,磨损率为3.18×10^(–5)mm^(3)/(N·m)。结论陶瓷颗粒的加入可有效提高涂层的耐磨性能,但耐磨性能也受添加颗粒尺寸因素的影响。该研究结果为泥浆泵关键部件的修复提供了一定的理论数据支撑。
This work studies the tribological properties of nickel-based ceramic composite ceramics to provide experimental support for field maintenance of key parts of the mud pump.The nickel-based cermet composite coating with different Al_(2)O_(3) and ZrO_(2) contents was prepared on the surface of Q235 steel by low pressure cold spraying.The friction and wear properties of the composite coating were tested on a tribometer in atmosphere.The microstructure and phase composition of the coating were characterized and analyzed by XRD and SEM.The hardness of the composite coating was tested by Vickers hardness tester.The influence of ceramic particle content on tribological properties of composite coatings was studied.The hardness of the composite coating increases first and then decreases with the increase of Al_(2)O_(3) content in the range of(9~33)vol.%of ceramic particles,while ZrO_(2) conversely,because the addition of ceramic particles changes the density of the coating.The friction coefficient of the composite coating decreases first and then increases with the increase of the Al_(2)O_(3) content resulting in the coating wear mechanism changed from adhesive wear to abrasive wear,however,the friction coefficient of the Ni-ZrO_(2) composite coating is approximately stable around 0.2.The wear rate of the coating decreases first and then increases with the increase of Al_(2)O_(3) content,while ZrO_(2) conversely.With the optimized content of 23 vol.%Al_(2)O_(3),the property of the coating wear resistance was obviously improved,the friction coefficient was as low as 0.149,and the wear rate was 3.18×10^(–5) mm^(3)/(N·m).The results show that the addition of ceramic particles can effectively improve the wear resistance of the coating,but it is also affected by the addition of particle size factors.This provides certain theoretical data support for the repair of the key components of the mud pump.
作者
张涛
成波
李文生
范祥娟
李建军
黄晓龙
ZHANG Tao;CHENG Bo;LI Wen-sheng;FAN Xiang-juan;LI Jian-jun;HUANG Xiao-long(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2021年第7期203-211,共9页
Surface Technology
基金
国家自然科学基金(51901093,51674130)
国家丝绸之路经济带国际科技合作基地基金项目(2017D01003)
甘肃省国际科技合作特派员计划(17JR7WA017)
甘肃省重点研发计划项目(17YF1WA159)
红柳优秀青年人才支持计划。
