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How to use graphite materials and other relevant factors to consider is, of course, die by the copper electrode conversion of graphite electrode. First of all, should be clear. Today part of the spark machine customers using graphite electrode discharge machining, which eliminates the mold cavity polishing and chemical polishing process can still achieve the desired surface finish. Without increasing the time and polishing process, the copper electrode can not produce such a workpiece. In addition, graphite is divided into different levels, in a specific application using the appropriate levels of graphite and electric spark discharge parameters to achieve the ideal processing effect, if the graphite electrode spark machine uses the operating personnel and the copper electrode of the same…
Compared with metal materials,the carbon carbon composite material has outstanding features. 1、Quality light The density of carbon carbon composite material is only 1/4 of the steel,after using the carbon carbon composite material,it can can greatly reduce the quality of the aircraft. For example,it can reduce 816.5kg of Boeing 747-400,and can reduce 998kg of A340. 2、Energy load Energy load is the index of absorbing the kinetic energy of the brake device,it’s usually indicated by the heat load ratio of the friction surface,the unit is J/cm2.As the heat capacity of C/C composite braking material is much higher than the powder metallurgy metal base material,so the energy load of carbon carbon composite material is 3 times higher than the powder metallurgy metal base…
C/C composite material was used for braking in the airplane for the first time in 1973,and now,over 60% of the carbon carbon composite material still be used for the airplane braking material,meanwhile, C/C composite material is also used for rocket nozzle, missile nose cone,parts on for re entering the atmosphere, racing car,high speed rail,tank etc. When the plane take off and land,the kinetic energy is very large,the kinetic energy of Boeing 767 aircraft is about 670MJ.the function of the brake disc is to make the airplane,with high kinetic energy and high momentum,slow and stop. The dynamic and stationary disc of aircraft will rub against each other to absorb the huge kinetic energy.the C/C composite material belong to the brittle materials,the…
