摘要
目的通过在磷酸盐复合涂层中添加二氧化硅杂化氮化硼纳米片材料(SiO_(2)-BNNSs)来提升磷酸盐复合涂层的硬度和耐高温磨损性能。方法以正硅酸四乙酯(TEOS)为硅源,利用溶胶凝胶法制备SiO_(2)-BNNSs杂化材料,并作为纳米增强相加入到涂层中。通过X射线光电子能谱(XPS)、场发射扫描电子显微镜(FE-SEM)和透射电子显微镜(TEM)对SiO_(2)-BNNSs杂化材料的化学组成和微观形貌进行表征。另外,采用喷涂法制备不同含量BNNSs和SiO_(2)-BNNSs的磷酸盐复合涂层,通过高温摩擦磨损试验探究涂层的摩擦磨损行为,对涂层磨痕形貌进行表征,并探讨涂层在高温条件下的磨损机理。结果XPS、SEM和TEM的分析结果表明,SiO_(2)成功修饰在BNNSs表面。SiO_(2)-BNNSs磷酸盐涂层相比零含量BNNSs涂层和纯BNNSs涂层表现得更加均匀致密,400℃条件下,质量分数为0.4%的SiO_(2)-BNNSs涂层硬度高达261.2HV。高温摩擦试验表明,BNNSs和SiO_(2)-BNNSs的加入,可以减轻涂层的磨损现象。同时,温度越高,涂层的耐磨损性能越好,400℃条件下,0.4%SiO_(2)-BNNSs涂层的摩擦因数和磨损率分别为0.48和66.24×10–6mm^(3)/(N·m),耐高温磨损性能表现为最佳。结论SiO_(2)-BNNSs杂化材料的添加可以明显提升磷酸盐复合涂层的耐高温磨损性能。
Phosphate composite coatings have excellent properties such as high hardness,wear resistance,corrosion resistance,and high temperature resistance,and the material is environmentally friendly and pollution-free.It is an advanced stainless steel metal surface protection technology.However,with the increasingly harsh service conditions of stainless steel metal components,traditional phosphate coatings have problems such as high porosity and poor wear resistance under high temperature conditions,which limit their application in fields such as marine engineering,petroleum industry,and chemical engineering.Therefore,by adding silica hybrid boron nitride nanosheets(SiO_(2)-BNNSs)into the phosphate composite coating,the high-temperature hardness and high-temperature wear resistance of the phosphate composite coating can be improved.With tetraethyl orthosilicate(TEOS)as the silicon source,SiO_(2)-BNNSs hybrid material was prepared by the sol-gel method,and used as a nano reinforcement phase of the coating.A stainless steel 304 steel plate was cut into square blocks(20 mm×20 mm×2 mm)as the substrates,which were then subject to sandblasting to Sa 2.5,and then ultrasonic cleaning with anhydrous ethanol for 1 hour to remove surface oil and dust.Alumina(Al_(2)O_(3)),zirconia(ZrO_(2)),aluminum vanadium(Bauxite),BNNSs and SiO_(2)-BNNSs reinforcement were mixed in proportion,and then subject to ball milling treatment.The ball milled powder was mixed with aluminum dihydrogen phosphate(AP)binder evenly to produce a coating slurry.According to the spraying method,the coating slurry with different mass fractions after stirring was sprayed onto the surface of the 304 substrates,and then the coating samples were obtained through room temperature and heating curing,respectively.The chemical composition and micro morphology of SiO_(2)-BNNSs hybrid material were analyzed by X-ray photoelectron spectroscopy(XPS),field emission Scanning electron microscope(FE-SEM)and transmission electron microscopy(TEM).In addition,the microhardness of the coating after high-temperature heating was tested with a microhardness tester,and the friction and wear behavior of phosphate composite coatings with different contents of BNNSs and SiO_(2)-BNNSs were studied through high-temperature friction and wear tests.The wear morphology of the coatings were characterized to discuss the wear mechanism of the coatings under high-temperature conditions.SiO_(2)-BNNSs hybrid reinforcement material was successfully prepared by the sol-gel method.XPS,SEM and TEM analysis results showed that SiO_(2) was successfully modified on the surface of BNNSs.Using spraying method,phosphate composite coatings with different contents of BNNSs and SiO_(2)-BNNSs were successfully prepared,the SiO_(2)-BNNSs phosphate coatings were more uniform and denser than the zero content BNNSs coating and the pure BNNSs coating.The hardness of the SiO_(2)-BNNSs coating with a mass fraction of 0.4wt.%at 400℃was up to 261.2HV.High temperature friction tests showed that the addition of BNNSs and SiO_(2)-BNNSs could reduce the wear phenomenon of the coatings.The higher the temperature,the better the wear resistance of the coating,and the friction coefficient and wear rate of the 0.4wt.%SiO_(2)-BNNSs coating at 400℃were 0.48 and 66.24×10–6 mm^(3)/(N·m)respectively,indicating the best high-temperature wear resistance performance.These results conclude that the addition of SiO_(2)-BNNSs hybrid material can significantly improve the high-temperature wear resistance of phosphate composite coatings.Flaky BNNSs will form a lubricating film during the coating wear process;At the same time,the hybridization of SiO_(2) on BNNSs results in a more uniform dispersion of nanomaterials in the coating,resulting in a denser coating and higher load-bearing capacity;In addition,the high temperature causes more adhesive phase AlPO4 to be generated,which allows more coating aggregates to bond together,effectively compensating for coating defects.
作者
魏文涛
王全龙
王剑宇
王轶遥
李啸
WEI Wentao;WANG Quanlong;WANG Jianyu;WANG Yiyao;LI Xiao(School of Mechanical Engineering,Jiangnan University,Jiangsu Wuxi 214122,China;Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment&Technology,Jiangnan University,Jiangsu Wuxi 214122,China;Jiangsu Micronano Manufacturing Engineering Research Center,Jiangnan University,Jiangsu Wuxi 214122,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2024年第15期34-44,76,共12页
Surface Technology
基金
国家自然科学基金(51705202)
江苏省自然科学基金(BK20170191)
江苏省博士后科研资助计划(2021Z325)。
关键词
氮化硼纳米片
二氧化硅
杂化材料
磷酸盐复合涂层
耐高温磨损性能
boron nitride nanosheets
silica
hybrid material
phosphate composite coating
high temperature wear resistance
作者简介
通信作者:王全龙。
