等离子喷涂NiCrMo-NiCrBSi合金减摩涂层的摩擦磨损性能  

Wear and Friction Behavior of Plasma Sprayed NiCrMo-NiCrBSi Alloy Anti-Friction Coatings

作　　者：董昕远 邓建基 雒晓涛[1] 李长久[1] DONG Xinyuan;DENG Jianji;LUO Xiaotao;LI Changjiu(State Key Laboratory for Mechanical Behavior of Materials,School of Materials Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]西安交通大学材料科学与工程学院,金属材料强度国家重点实验室,陕西西安710049

出　　处：《材料保护》2023年第9期39-47,109,共10页Materials Protection

基　　金：国家自然科学基金重点项目(U1837201;52031010)资助。

摘　　要：内燃机在工作时活塞环与缸套发生摩擦,将造成能量损失与缸体的磨损损伤。针对缸套与活塞环的摩擦磨损问题,采用复合材料理论设计了成分为NiCrMo-30%NiCrBSi的复合减摩涂层。利用大气等离子喷涂技术,采用NiCrMo-NiCrBSi混合粉末制备了减摩涂层,研究了该涂层的断面组织、硬度及其在模拟缸套-活塞环摩擦磨损条件下的摩擦磨损行为。试验结果表明,采用混合粉末喷涂,可以获得结合良好、硬度适中(564 HV_(3N))的复合涂层。在干摩擦磨损条件下,NiCrMo-NiCrBSi复合涂层表现出优异的综合耐磨损性能,涂层自身与对磨件(销)的磨损量都较小,且表面可生成MoO_(2),降低摩擦系数;在油润滑磨损条件下,由于表面生成MoS_(2),摩擦系数显著降低(稳定后约为0.1),复合涂层与摩擦副的磨损几乎可以忽略。When the internal combustion engine is working,the friction between the piston ring and the cylinder liner will cause energy loss and wear damage to the cylinder block.Aiming at the problem of friction and wear of cylinder liner and piston ring,a composite anti-friction coating composed of NiCrMo-30%NiCrBSi was designed by using composite material theory.The anti-friction coating was prepared with NiCrMo-NiCrBSi mixed powder by atmospheric plasma spraying technology.The cross-sectional structure,hardness and friction and wear behavior of the coating under simulated cylinder liner-piston ring friction and wear conditions were studied.Results showed that composite coatings with good bonding and moderate hardness(564 HV_(3N))could be obtained by spraying mixed powders.Under dry friction and wear conditions,the NiCrMo-NiCrBSi composite coating exhibited excellent comprehensive wear resistance.The wear amount of the coating itself and the abrasive part(pin)was small,and MoO_(2) could be generated on the surface to reduce the friction coefficient.Under oil-lubricated wear conditions,due to the formation of MoS_(2) on the surface,the friction coefficient was significantly reduced(about 0.1 after stabilization),and the wear of the composite coating and the friction pair could be almost negligible.

关 键 词：大气等离子喷涂 复合金属涂层 摩擦磨损 

分 类 号：TG174.4[金属学及工艺—金属表面处理]