Papers by Keyword: Electroless Plating (EP)

Abstract: The pretreating procedures on the inertial confinement fusion (ICF) pellet and the preparing procedures of th bath of electroless Ni-P plating were described in detail. The effects of the pH value of the bath on the coating quality, of the plating temperature on the yield of the coated microsperes and the plating rate, and of the plating time and the content of the complexing agent on the yield of the coated microsperes were investigated. The morphologies of the coating of the microsperes were evaluated by Olympus-BX51 optical microscopy (OM) and the coating thicknesses were measured by Scanning Electron Microscopy (SEM).

Abstract: Electroless deposition technique was used to coat Ni-P on TiB₂ particles by activating the TiB₂ powder in a furnace at 400 ^◦C for 1 h. Scanning electron microscopy images and EDS spectra before and after electroless nickel plating confirm that nickel is deposited on the surface of TiB₂ particles. With the increase of heat treatment temperature, coating weight is increased firstly and then decreased, and reached the maximum value at 400 ^◦C. XRD results show that the Ni-P deposit was predominantly amorphous. However, after heat treatment, the metallic deposits can easily transform into crystalline Ni and Ni₃P phases, as confirmed by DSC and XRD analyses.

Abstract: The magnetic polymer ICF targets are fabricated by depositing the Ni-P coats on the surface of polystyrene microsphere using the electroless plating. The microstructur of the coat, and the magnetic property, surface roughness and sphericity of the magnetic microsphere were examined and analyzed, resperctively. The results indicated the examined indexes can basically meet the requirements of ICF targets.

Abstract: The Ni-P-Al₂O₃ composite film was coated on mild steel of SS400 with electroless plating method. In this process, different sizes of Al₂O₃ particles and different blended amounts of Al₂O₃ particles into the plating solution were applied. From the surface and cross section observation, it is known that the Al₂O₃ particles were uniformly dispersed in the Ni-P alloy. The highest corrosion resistance and the highest wear resistance of the Ni-P-Al2O3 composite film were obtained when adding Al2O3 particles with the mean diameter of 0.05μm into the plating solution at the blended amount of 1.0g/L.

Abstract: Silver film was fabricated on a glass substrate by electroless plating technique. Plating solution, which also known as Tollen’s reagent, consisted of three main solutions: silver nitrate solution as a silver source, ammonia and sodium hydroxide as pH controllers and D-glucose as a reducing agent. Glass surface was treated by three different methods: HF etching, SnCl₂ activation and SiC paper grinding. After that, a glass slide was immersed in plating solution for 90 minutes at a room temperature. The purpose of this work was to study the effects of different surface treatments on adhesion between substrate and film. X-ray diffraction (XRD) pattern confirmed that the obtained film was a silver phase. Surface morphology of glass slides, before and after plating was investigated by scanning electron microscope (SEM). Moreover, the adhesion of silver film to glass substrate was performed by crosscut test and it was indicated that combined treatment by SiC paper grinding and HF etching was the best surface treatment which provided a good adhesion of film to substrate.

Abstract: In vitriolic electrolyte, DC power supply is used on 7075 aluminum alloy to have anodic oxidation treatment then let the oxidized samples have a treatment of electroless plating. Surface morphology of the coating and performance of corrosion wear are studied by means of scanning electron microscope (SEM) and friction and wear experimental machine. The results show that unsealed oxide coating have many holes and cracks, which are extremely badly-distributed; corrosion resistance of the oxide coatings which have the treatment of electroless plating have improved, having lower coefficient of friction and better performance of corrosion wear; besides; coefficient of friction of the samples in water is higher than that in salt water, its wear amount is less.

Abstract: The Ni-coated TiH₂ composite powder was prepared by electroless plating and the concentration of reducing agent, reaction temperature, reaction time, PH value and so on were optimized by orthogonal experiment design. The Ni/TiH₂ composite powder morphology and composition was analyzed by scanning electron microscopy (SEM), Energy Dispersive spectroscopy (EDS), X-ray diffraction (XRD); the plated Ni layer growth mechanism was explored preliminary. The Optimization technical parameters: the plating temperature was 85, the pH value was 10 and the hydrazine concentration was 100ml/L. Complete coating and uniform thickness of the Ni layer with average coating thickness about 2.0μm was successfully prepared with the optimization technical parameters. The growth mechanism of the coating followed the Ostwald ripening mechanism. Compared the TiH₂ uncoated with Ni layers particles, the TiH₂ composite powder could efficiently delay the starting time of gas release by approximately 80s.

Abstract: Effects of surfactant, PTFE concentration in plating bath on surface morphology and the microstructure of electroless Ni-P-PTFE composite coatings were investigated in this study. The dependence of microstructure and distribution of PTFE particles in composite coatings upon surfactant agent and PTFE content in the plating bath were reported. Also, effects of ultrasonic frequencies on PTFE content in the coatings were discussed. The surface morphology and microstructure of the composite coatings were analyzed using scanning electron microscope (SEM) and X-ray dialysis (XRD), respectively. The results obtained are indicating that surfactant and PTFE concentration in the plating bath have a great impact on PTFE content in the coatings, the population of PTFE in the coatings proved to increase with increasing surfactant concentration properly. In addition, ultrasonic frequency could change the PTFE content in the coating. The composite coating shows different surface morphology and microstructure in various surfactant concentrations, PTFE concentrations and ultrasonic frequencies.

Abstract: Cu-coated diamond particles in variable mass ratio of diamond and Cu are prepared by electroless plating process, then the coated particles are sintered by Spark Plasma Sintering (SPS) respectively. Diamond/Cu composites with high content of diamond(70vol%) are obtained eventually. The results indicate that not only coating diamond by copper electroless plating process could be used to obtain well-dispersed Diamond/Cu composites, but also effectively to improve the relative density of the sintered body, the relative density of the sintered body at 70vol% content of diamond is about 97.5%, as well as to obtain the composite with higher thermal conductivity. Thermal conductivity of the 70vol% Diamond-Cu composite reaches as high as 404 W/(m•K).

Abstract: By means of X-ray diffractometry (XRD) and transmission electron microscope (TEM), the micro-structure of 5 different Ni–B alloy coatings prepared by electroless plating with Potassium borohydride content ranging from 0.2 to approximately 1.4g/L was studied The influence of the KBH4 content in the coatings on their micro-structure was also investigated. It has been found that Ni–B alloy coatings showed amorphous sytuctue with XRD while with TEM it showed a combination of amorphous and nanocrystalline structure. It was further revealed that the amorphous structure increased with increasing KBH4 content, which means that Ni-B alloy coating prepared with increasing KBH4 content undergoes a transition process as follows: nanocrystalline → crystalline → amorphous structure. Results indicated that the micro-structure of Ni-B alloy coatings should be studied by both methods of XRD and TEM.