结晶器铜板表面HVOF喷涂NiCrCoBSi多主元合金涂层的高温磨损性能  

High-temperature Wear Performance of NiCrCoBSi Multiple Principal Elements Alloy Coating Sprayed by HVOF on the Surface of Crystallizer Copper Plate

作　　者：黄东保 周霆伟 郁海涛 贾玺泉 徐震霖 何宜柱[1] 董振启 张慧勇 HUANG Dongbao;ZHOU Tingwei;YU Haitao;JIA Xiquan;XU Zhenlin;HE Yizhu;DONG Zhenqi;ZHANG Huiyong(School of Materials Science and Engineering,Anhui University of Technology,Ma'anshan 243002,China;Taier(Anhui)Industrial Technology Service Limited Company,Ma’anshan 243002,China)

机构地区：[1]安徽工业大学材料科学与工程学院,马鞍山243002 [2]泰尔(安徽)工业科技服务有限公司,马鞍山243002

出　　处：《中国表面工程》2024年第5期275-287,共13页China Surface Engineering

基　　金：安徽省重点研究与开发项目(2022a05020017);国家自然科学基金(51271001)。

摘　　要：针对连铸结晶器铜板在服役过程中的磨损失效问题,采用超音速火焰喷涂(HVOF)技术在结晶器铜板表面制备了NiCrCoBSi自熔性多主元合金涂层,以提高铜板的耐磨性能。利用XRD、SEM、TEM等方法研究了NiCrCoBSi涂层的微观结构;借助摩擦磨损设备对其耐磨性进行评价,并与市场化占有率最高的电镀NiCo涂层进行对比。结果表明:NiCo涂层为单相面心立方(FCC)固溶体结构,而NiCrCoBSi涂层的主要物相包括FCC固溶体、CrB和M_(23)C_(6)。与NiCo涂层相比,NiCrCoBSi涂层的硬度提高了95%,而断裂韧性只下降了5.4%。磨损测试后发现两种涂层的磨损机制均以黏着磨损、疲劳磨损为主,伴随着少量磨料磨损。NiCrCoBSi涂层表现出优异的耐磨性和较低的摩擦因数,其磨损率较NiCo涂层降低了81%。NiCrCoBSi涂层耐磨性较高的主要原因是其较高的硬度、内部的各种硬质耐磨相以及磨损表层的加工硬化。这是因为在循环载荷作用下,涂层产生塑性变形,涂层的硬质相在塑性变形过程中被切割、旋转,导致碳化物及硼化物被细化和球化,从而提升了磨损表层的硬度。制备了具有优异高温耐磨性能的NiCrCoBSi自熔性多主元合金涂层,为长寿命铜及其合金涂层的开发提供了理论依据和技术参考。Crystallizers are the core components of continuous casting equipment,and their quality directly impacts billet quality and production efficiency.With the advancement of high-drawing-speed continuous casting technology,higher performance requirements for crystallizers have been proposed,particularly concerning wear,a major cause of crystallizer copper plate failure.Currently,electroplated crystallizer coatings hold approximately 80%of the market share.However,the long deposition cycle,low hardness,tendency for coating peeling,and environmental pollution caused by electroplating technology make it inevitable for this technology to be phased out.Supersonic flame spraying(HVOF)is one of the most widely used thermal spraying technologies,capable of producing highly dense and uniform coatings due to its fast flame flow rate,high powder kinetic energy,and low oxidation levels.In addition,the HVOF technology offers a wide range of material options and can be functionally designed to accommodate different sizes and parts of the crystallizer,meeting continuous casting requirements.A NiCrCoBSi multiple principal element alloy coating has been applied to the surface of crystallizer copper plates using HVOF technology to improve their high-temperature wear performance of copper plates.The microstructure of the NiCrCoBSi coating was studied using X-ray diffraction,scanning electron microscopy,and transmission electron microscopy.The wear resistance of the coatings was evaluated using frictional wear equipment and compared with that of the commonly marketed electroplated NiCo coating.Additionally,the wear mechanisms of the coatings were analyzed.The results showed that the NiCo coating had a single-phase face-centered cubic solid solution structure,whereas the NiCrCoBSi coating exhibited an FCC solid solution,with CrB and M_(23)C_(6)as the main phases.Both coatings had high densities with no observed cracks.A clear delamination was found between the NiCo coating and the copper alloy substrate,with no transition zone,indicating

关 键 词：超音速火焰喷涂 多主元合金 铜板 涂层 磨损 

分 类 号：TG142[一般工业技术—材料科学与工程]