Ni-Mo-Er(Gd)-MoSi2复合镀层的制备研究
关键词：脉冲电沉积；Er；Gd；二硅化钼；复合镀层
Preparation of Ni-Mo-Er(Gd)-MoSi2 Composite Coating
Abstract: The paper is to use pulse plating method for the preparation of Ni-Mo-Er(Gd)-MoSi2 composite coating. The effects of the concentration of Er or Gd, positive duty cycle, plating time, the forward current density frequency of Ni-Mo-Er(Gd)-MoSi2 composite coating hardness were studied. We use a scanning electron microscope (SEM), X-ray diffraction (XRD), electron spectroscopy (EDX), friction and wear tester, thermal dilatometer to recive the characterization results of the composite coating. It shows that when the concentration of MoSi2 is 0.4g/50ml and the concentration of the surfactants is 0.09g/L, the optimal conditions were: Er3+ concentration is 0.3g/L, the current density is 18.75A/dm2, the frequency is 2500Hz, the duty cycle is 1/2 and the plating time is 20min; Dd3+ concentration is 0.2g/L, the current density is 19.5A/dm2, the frequency is 2500Hz, the duty cycle is 1/2 and the plating time is 25min. Under this condition, the hardness of the Ni-Mo-Er-MoSi2 and the Ni-Mo-Gd-MoSi2 composite coatings is 781.5HV and 877.88HV respectively. To campare with the Ni-Mo-MoSi2 composite coatings, the hardness of the Ni-Mo-Er(Gd)-MoSi2 is increased 12.38% and 14.37%. To characterize the Ni-Mo-Er(Gd)- MoSi2 composite coating ,we can know that to campare with the Ni-Mo-MoSi2 composite coatings, the content of Mo in the Ni-Mo-Er(Gd)-MoSi2 is increased 12.38% and 14.37% and the content of Si in the composite coatings is also increased 1.623% and 2.613%. Besides, Er and Gd enter the crystallattice of the composite coatings respectively, forcing the distortion of the crystallattice to occur, and the diffraction peak shift. They can also restrain the contraction of the Ni-Mo-Er(Gd)-MoSi2 composite coatings and enhance their heat-resisting quantity and its wear resistance. Besides, the current literatures about the preparation of the Ni-Mo-Er(Gd)-MoSi2 composite coating by pulse electrodeposition have not been reported.
Key Word: Pulse Electrodeposited; Er; Gd; MoSi2; composite coating
目 录
摘要 I
Abtract I
1. 引言 1
1.1 二硅化钼的性质及意义 1
1.2 复合镀的工艺现状 3
1.2.1自润滑复合镀层 3
1.2.2 电接触功能复合镀层 3
1.2.3 耐高温复合镀层 4
1.2.4 耐腐蚀复合镀层 4
下一篇：甲醛的简易检测新方法研究