首页|镍/碳化钨钎涂层界面行为与力学性能

镍/碳化钨钎涂层界面行为与力学性能

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具有高耐磨、抗腐蚀、高硬度的镍/碳化钨复合涂层,在盾构部件、航空航天等领域广泛应用.为提高水力机械过流部件服役寿命,以WC颗粒和镍基粉状钎料为原材料,采用真空钎涂在201不锈钢表面制备镍/碳化钨复合钎涂层,借助扫描电镜、金相显微镜、洛氏硬度计对钎涂层界面微观组织和力学行为进行研究.结果表明,涂层与基体之间元素扩散主要表现为钢基体中Fe、Cr和Mn元素向涂层组织中溶解扩散,在界面处偏析沉淀:含有25%(质量分数)wC钎涂层显微硬度分布均匀,是钢基体的4.6倍;钎涂层耐磨性随WC含量增加而提高,添加15%~35%WC可显著提高基体表面耐磨性,复合钎涂层耐磨性是钢基体的8.4~15.7倍;钎涂层表面未发生明显变化,裂纹开口平整,呈脆性断裂.
Interface Behavior and Mechanical Properties of Ni/WC Brazing Coating
Ni/WC composite coating with high wear resistance,corrosion resistance and high hardness characteristics is widely used in shield components,aerospace and other fields.In order to improve the service life of hydraulic machinery overflow components,the Ni/WC composite brazing coating was prepared on the surface of 201 stainless steel by vacuum brazing process with WC particles and Ni-based powder brazing filler metals as raw materials.The interface microstructure and mechanical behavior of the brazing coating were investigated through scanning electron microscope,metallographic microscope and Rockwell hardness tester.The results show that the diffusion behavior of elements between the coating and substrate is mainly the dissolution of Fe,Cr and Mn elements from the stainless steel into the coating microstructure,and the segregation precipitation phenomenon appears on the interface.25wt%WC coating shows a uniform hardness distribution,whose hardness is 4.6 times higher than that of steel substrate.The wear resistance of coating is increased with increasing the WC content.15wt%-35wt%WC addition can significantly improve the wear resistance of the steel surface.The wear resistance of the coating is 8.4-15.7 times as high as that of the steel,the surface of the coating does not change significantly,and the crack opening is flat and brittle fracture.

vacuum brazingNi/WC coatinginterface behaviorwear resistancefracture characteristic

王星星、李阳、武胜金、杜全斌、贾连辉、李帅、陈小明

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华北水利水电大学河南高效特种绿色焊接国际联合实验室,河南郑州 450045

河南机电职业学院河南省超硬材料智能制造装备集成重点实验室,河南郑州 451191

中铁工程装备集团有限公司,河南郑州 450016

水利部杭州机械设计研究所浙江省水利水电装备表面工程技术研究重点实验室,浙江杭州 310012

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真空钎涂 镍/碳化钨涂层 界面行为 耐磨性 断裂特征

国家自然科学基金国家自然科学基金河南省优秀青年科学基金河南省高校科技创新人才计划河南省超硬材料智能制造装备集成重点实验室开放课题龙门实验室开放课题河南省高层次人才"中原英才计划-中原青年拔尖人才"计划

520711655170515120230041026822HASTIT026JDKJ2022-02LMQYTSKT016

2024

稀有金属材料与工程
中国有色金属学会,中国材料研究学会,西北有色金属研究院

稀有金属材料与工程

CSTPCD北大核心
影响因子:0.634
ISSN:1002-185X
年,卷(期):2024.53(1)
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