【摘 要】
：
In order to improve the of wear and heat resistance of Al alloys,the electro-deposition of Ni-Co-P/Si3N4 coating on a hyper-eutectic Al-Si casting alloy was studied in this paper.The weight,thickness,
【机 构】
：
Department of Applied Physics,Chongqing University,Chongqing,400044,P.R.China
【出 处】
：
第四届国际表面与界面科学与工程学术会议(The Fourth International Conference on S
论文部分内容阅读
In order to improve the of wear and heat resistance of Al alloys,the electro-deposition of Ni-Co-P/Si3N4 coating on a hyper-eutectic Al-Si casting alloy was studied in this paper.The weight,thickness,hardness,surface morphology,composition and wearing resistance of Ni-Co-P/Si3N4 coating have been measured by analytical balance,optical microscope,micro-hardness tester,SEM,EDS and abrasion tester.It shows that Ni-Co-P/Si3N4 coating is in a shape of cystiform and Si3N4 particles are uniformly distributed in the composite coating.And Ni3P alloy which come into being after heat treatment,can strengthen the coating and improve the hardness and wearing resistance of the coating.By an orthogonal experiment,the effect of process parameters,such as electric current density,temperature,PH,plating time and component of electroplating bath on the performance of Ni-Co-P/Si3N4 electroplated coating,such as thickness,hardness,contents of Si3N4 in the coating and deposition speed,have been obtained.It is found that the wearing resistance of the coating is improved with the increase of hardness and contents of Si3N4 in the coating,but with increasing contents of P and Co in the coating,the coating becomes harder,more fragile and the adhesion performance gets poor.Then the optimal technological parameters of composite plating were suggested.
其他文献
ZrB2、AlN coatings and ZrB2/AlN multilayered coatings have been synthesized by ultra-high vacuum IBAD at room temperature.Scanning electron microscopy,X-ray diffraction,XP-2 profiler and Nano indenter
The aim of the present research was to investigate the influence of substrate roughness on structure and mechanical properties of Titanium Aluminium Nitride (TiAlN) coatings.Tungsten Carbide rectangul
TiO2 powders have been successfully synthesized using TiCl4 and air as precursors by atmospheric pressure plasma jet (APPJ),which was powered by a near-square wave high voltage (H.V.) of 8 kV and a fr
CrN thick comings were deposited on silicon (111) by middle-frequency magnetron sputtering system under various parameters.The microstructure was analyzed by X-ray diffraction (XRD),scanning electron
The crystallograpic structure and properties of Zirconium nitride (ZrN) films deposited on 304 stainless steel were investigated for substrates oriented parallel with and perpendicular to the Zirconiu
The structure and the hardness of the low carbon steel part based on the rapid prototyping technique of powder plasma arc welding were studied.The deposition experiments were done on the parent metal
This paper reports,for the first time,an interesting phenomenon associated with the high current pulsed electron beam (HCPEB) treatment:unlimited supersaturated solid solution of Al and Si elements of
TiN and (Ti,Al) N films were prepared by axisymmetric magnetic field (AMF) enhanced arc ion plating (ALP).Based on the results of finite element method (FEM) simulation and the physical mechanism of t
Intermetallic compounds,such as NbSi2 and MoSi2,have recently attracted much attention as potential coating materials because of their high melting points and excellent oxidation resistance.In order t
Aluminum film on CFRP has been tested by thermal cycling according to the especial condition of space.Properties of aluminum film been characterized by electron pull apparatus、XPS and SEM.The results