Month: July 2018

CNC Wire Cutter

Wire Electrical Discharge Machining The physical principle of Electric Discharge Machining (EDM): In order to generate an electric spark between two electrodes, the voltage between the two electrodes must be higher than the gap between the electrode and the workpiece, while the breakdown voltage depends on: The distances between the electrode and the workpiece. Insulation capacity of electrolyte (the ratio of water and resistance) Pollution in the gap The discharge occurs at the point where the electric field is strongest, which is a very complicated process; Positive ions and electrons accumulate in the field, and quickly form an ionized conductive channel. During this process, an electric current is formed between the two plates, and it causes numerous collisions between the particles that forms a plasma region. After that, the temperature rises up to around 8000 ° C to 12000 °C, and the materials are melted on the surface of the two conductors while a bubble is formed due to vaporization of the electrodes and the dielectric liquid, and its pressure level is very high at this point. Next, the electric current stops while the temperature suddenly drops as well that leads to the inward blast of the bubble. The power that …

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Porous Ceramic

Porous Ceramic I. Quoting For porous ceramics, the microstructure is made up of small crystals called grains. In general, the smaller the grain size, the stronger and denser is the ceramic material. The wide variety of applications for porous ceramic materials results from their unique properties. In many respects, these properties cannot be achieved by other materials. II. Processing/Foreword For many years, the presence of porosity in ceramics was often seen to be problematic and a significant scientific effort was made to devise processing routes that produced ceramics with zero porosity. An exception to this philosophy was the refractory industry, in which it was understood that the presence of porosity is critical in controlling thermal conductivity. In these materials, porosity is controlled to optimize the elastic behavior and weight. In more recent times, scientific developments have touched on new areas such as biomimetic, in which scientists aim to duplicate natural structures. There has also been the push(and pull) to design materials and devices at smaller scale levels. Materials are becoming multifunctional with designed hierarchical structures, and porous ceramic can be seen in this light. The challenge now is for materials scientists to produce ceramics with porosity of any fraction, shape, …

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