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The crucible is a bowl shaped container with a deep bottom. The general graphite crucible can not guarantee the safety in the high temperature environment, and the conductive speed is slow so that it is not conducive to the experiment. When a solid is heated by a fire, it is necessary to use a graphite crucible. Because it is more able to withstand high temperatures than glass vessel, the current silicon carbide crucible is widely used. We don’t put too full the melting stuff in the silicon carbide crucible usually when it is used so as to prevent the heat from jumping out and let the air be free to get in and out for possible oxidation reaction. Because the…
In twenty Century, copper was widely used as electrode material in EDM. At that time, only in the production of large electrodes and mold processing requirements are not high or rough machining, graphite materials will become an alternative. Some of the early contact with the graphite electrode of the technical staff have a general impression: the graphite material is dirty, surface effect is not good, the processing efficiency is not high, etc.. With the development of high and new technology, and constantly improve the manufacturing process of graphite material, can satisfy different EDM demand of graphite materials emerge in an endless stream, market graphite for high speed milling machine tool arises at the historic moment, numerical control electric spark machine…
The carbon carbon composite materials as excellent thermal structure, functional integration of Engineering materials, since its birth in 1958, it has been greatly developed in the military , the most important use is for the manufacture of missile warhead components. Due to its high temperature resistance, good wear. It has been widely used in solid rocket motor, aerospace structural parts of aircraft, aircraft and racing brake device, the heating element and mechanical fasteners, heat exchanger, aviation engine hot end components. The properties of carbon carbon composites: (1) The physical properties: the C / C composites after heat treatment in the chemical composition and elemental carbon higher than 99%, low density, has a strong affinity, due to the high melting point…
