Non-metallic Surface Deposition Of Iron Membrane Process

Currently, in inertial confinement fusion (ICF) experiment, the designed cavity of integral hohlraum target must be very small allowing for the restrictions of laser energy. The diameter and length of target with the accuracy in micrometer level are usually constructed in millimeter lever, and most of the surface areas are less than 15 mm2. Obviously, such a small integral hohlraum target with high accuracy can not be manufactured through the mechanical processing. The integral hohlraum Fe target should be prepared by the liquid phase deposition method. Based on the catalysis of surface metallization on organic core in pretreatment process, the chemical deposition processing of iron coating derived from the plating bath is relatively easy to be controlled by redox reaction, and purity of the iron deposition can meet the requirement of the integral hohlraum target. Meanwhile, the deposition possesses many excellent properties, such as compactness, less pinhole and controllability of thickness. Therefore, this thesis relates the investigation in preparation of integral hohlraum Fe target used in ICF experiment by surface deposit process, and explores the optimum technological conditions.The investigation of electroless iron plating process on nonmetal substrate was presented in this thesis, and the procedure of plating iron coatings was studied preliminarily. In this experiment, the thin iron coating was firstly deposited on the polymethylmethacrylate (PMMA) substrate through the electroless plating method base on the pre-treatment of substrates. The technological formulation of electroless iron plating was investigated, which contains the main salt, complexing agent, buffer agent and reducing agent. In the next experiment, in order to deposit dense layer of light rail, saccharin and lycine were employed as additives in this bath to improve the compactness and brightness of coatings. Meanwhile, the effects of components in plating solution and process conditions on plating rate and porosity were discussed in details. An Optimal experimental formula was determined through the orthogonal experiment about the composite complexing agent. The result of the effect of additives on the surface morphology characteristics indicated that the compact and smooth iron coatings can be formed under the conditions of 2g/L saccharin and 0.2g/L lycine. In addition, we also studied the solution composition in the electroplating process, which contains main salt, stabilizer, conductive salt, the anode activator, wetting agent and additives. The samples derived from this plating bath were determined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometer (EDS).