原位碳化钛颗粒增强镍基喷焊层的组织与性能  

Microstructure and Properties of In-situ Titanium Carbide Particles Reinforced Ni-based Coatings

作　　者：吴雁楠 黄诗铭 朱平[1] 马振一 兰博 何翰伟 郝博文 WU Yan'nan;HUANG Shiming;ZHU Ping;MA Zhenyi;LAN Bo;HE Hanwei;HAO Bowen(School of Materials Science and Engineering,Dalian Jiaotong University,Dalian 116028,China)

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028

出　　处：《热加工工艺》2021年第22期96-98,102,共4页Hot Working Technology

基　　金：国家自然科学基金项目(51605070);辽宁省教育厅科学研究项目(JDL2017029);辽宁省自然基金指导计划项目(2019-ZD-0119)。

摘　　要：利用等离子弧喷焊技术,以纯Ti粉与Ni60粉的混合粉末作为喷焊材料,在Q345钢表面制备原位碳化钛颗粒增强镍基喷焊层,研究了该喷涂层的微观组织与性能。结果表明,喷焊层中主要包含TiC、M_(23)C_(6)、M_(7)C_(3)、γ-Ni等相,微观组织特点是原位TiC颗粒均匀的分布在Ni基体中。原位TiC颗粒与Ni基体的界面强度高,可形成近似完全共格界面。喷焊层的显微硬度和耐磨性明显提高,主要与原位TiC等强化相颗粒的存在有关。与Q345钢相比,喷焊层具有更小的摩擦系数,磨损失重降低了86.4%。In-situ titanium carbide particles reinforced Ni-based coatings on Q345 steel were prepared by plasma spray welding with the mixed powders of pure Ti powders and Ni60 powders.The microstructure and properties of the coatings were studied.The results show that the main phases of the coatings are TiC,M_(23)C_(6),M_(7)C_(3) andγ-Ni.Besides,in-situ TiCparticles distribute uniformly in Ni matrix.The interface between in-situ TiC and Ni matrix is strong,and it could form an almost perfect coherent interface,which is beneficial to the performance improvement of the coatings.Due to the existence of the reinforced particles,such as in-situ TiC,the microhardness and wear resistance of the coatings improves.Compared with Q345 steel,the coatings have a smaller friction coefficient,and the wear loss decreases by 86.4%.

关 键 词：等离子喷焊 原位TiC 微观组织 显微硬度 磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG455[金属学及工艺—金属学]