CAJ | 학술논문

双脉冲电沉积法制备的镀层比直流电沉积层在硬度、应力、耐蚀性方面更佳,目前就双脉冲法制备的Ni-SiC复合镀层的摩擦学行为的研究较少.为此,利用直流和双脉冲2种电沉积方法制备了Ni-SiC复合镀层,研究了加入SiC颗粒对2种复合镀层微观结构和室温干摩擦条件下磨损性能的影响,并将两者进行比较.利用X射线衍射仪(XRD)检测了镀层的微观结构,通过扫描电镜(SEM)观察了镀层的磨损表面,分析了磨损机理.结果表明:脉冲方法能够更有效地提高镀层硬度,降低宏观残余应力,随着SiC颗粒含量的增加,Ni-SiC复合镀层的摩擦系数减小,磨损率降低.
쌍맥충전침적법제비적도층비직류전침적층재경도、응력、내식성방면경가,목전취쌍맥충법제비적Ni-SiC복합도층적마찰학행위적연구교소.위차,이용직류화쌍맥충2충전침적방법제비료Ni-SiC복합도층,연구료가입SiC과립대2충복합도층미관결구화실온간마찰조건하마손성능적영향,병장량자진행비교.이용X사선연사의(XRD)검측료도층적미관결구,통과소묘전경(SEM)관찰료도층적마손표면,분석료마손궤리.결과표명:맥충방법능구경유효지제고도층경도,강저굉관잔여응력,수착SiC과립함량적증가,Ni-SiC복합도층적마찰계수감소,마손솔강저.
Ni-SiC composite coatings were prepared on AISI-1045 steel disc by using direct current electrodeposition and reverse-pulse electrodeposition. The effect of SiC particles on the microstructure and dry sliding friction and wear behavior of the composite coatings was investigated. The crystal structure of the composite coatings was analyzed by means of X-ray diffraction. The morphology of the worn surfaces of the composite coatings was observed by using a scanning electron microscope. Results indicate that Ni crystallites in the composite coating prepared by reverse-pulse electrodeposition are preferentially oriented along [111] texture,which contributes to the more effective increase of the hardness and decrease of the macro-residual stress of the composite coatings. Moreover, the friction coefficient and wear rate of the composite coatings decreased with increasing content of SiC, and the composite coating prepared via reverse-pulse electrodeposition showed better friction-reducing and antiwear ability than the one prepared via direct current electrodeposition.