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A few years ago, it was thought that the surface quality of parts processed with graphite could only reach VDI18. However, it has been shown that the surface quality of the workpiece processed by graphite can reach VDI12 or higher grade. Of course, this standard is not for all graphite materials, or by EDM traditional situation, such as crude graphite or conventional graphite can not reach the standard. In order to obtain the surface quality, various production conditions must be in the best fit state with graphite material. In this case, the size of the electrode, the choice of the type of graphite is the key factor, will play a decisive role. However, the important point is that the use…
In graphite field, impregnation is a kind of technology ,via dipping graphite product into certain kind of melted material, which can change physical or chemical condition of graphite product. In general, increasing in porosity of graphite product can not only lead to decling in gravity (density),rising in resistance, decreacing in mechanical strength, but also make product become more easier to be oxidated, to be corrosion and to be immersed. To avoid those circumstance, you can use impregnation technology to control porosity of graphite product. Usually, when you face following condition, you should apply impregnation . 1. Producing little scale graphitized electrode and Joint stock. Those product are required high strength, low density and resistivity, so semi-finished products should be impregnated…
The glassy carbon (GC) is a new type of carbon material ,it’s similar to glass and in the carbon structure, and it is also a new type of amorphous carbon structure material. The GC is made of biological resin carbon through high temperature pyrolyzation and carbonization . It does not contain harmful substances on the human body, high purity carbon. Glassy carbon is characterized by its high hardness and permeability due to its port morphology and structural characteristics similar to that of glass. Glass carbon has high strength, hardness and elastic modulus. It can be used to make high speed typewriter wheel and record. Glass carbon has many superior properties: density is small, about 1.3g/cm3; 3800℃high temperature resistance; anti penetration;…
