The Research On Techniques Of Foam Metals Ni Manufacturing In The Jet-electrodeposition Process

Foamed metal or porous materials were developed at the end of the 80's. They have excellent physical properties, especially in damping areas, so they are widely used for noise elimination, vibration insulation, electromagnetic screening and so forth. Up to now, the main methods of manufacturing those materials are process like sintering, special found and electrodepositing. Those methods all make use of the foaming agent which could create holes and hollow structures in the metal. According to the theory of electrodiposition, the process far away from the balance could give birth to a special structure named dendritic crystal, using this phenomenon could help us to produce foamed structured metals directly without foaming agent. It must be different from the original foamed metals in structure and faculty.Electrodepositing methods are used to research the rules of dendritic growth in a large area, works are be doing to be familiar with the rules of these process in order to get foamed metal shaped directly by this way. Then the results of the process are tested in its performance in some areas. Here is the specific statement:1. Organizing experiments to find out the rule of the process is the subject's first job, a large scope of parameters are changed to find how to make the dendritic growth more healthy and plump, the current, fluid flux, thickness of Ni+, the distance from the nozzle and electrode, shape and move of nozzle, the time are all taken into consideration. Pictures of the results are made and the variation directions of the samples are analyzed, after that procedure, the influence of these given technological conditions to the electrodeposition process could be found out. And then different conditions'results are compared together, the theory and the explanation of the results are improve after that process.2. Further analysis are made in the electrodepositing results, fractal dimensions are calculated to take value of the degree of branching by using a software which could show if the process is prosperous, the porosity is also measured to see how much it fits into the request of foam metals. The trends of the parameters transformation are also analyzed. At last, analysis and simulation of the electrical field and flow field are made respectively which could explain some special phenomenon in the experiments.3. The results'performance in electricity and mechanics are measured and then comparison between the new ones and the original ones are made.