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Carbon carbon composite material is carbon fiber reinforced carbon matrix composites. Carbon carbon composite material is derived from an unexpected discovery. In 1958, the United States VOUGHT CHANCE Laboratory,Carbon matrix was obtained from the carbon / phenolic experiment because of the failure of the operation. As a result, a new member of the composite family has been added. The main preparation procedure of carbon carbon composite material is : preform molding, densifying and graphitization. Densification technology is the key technology of carbon carbon composite material. The densification methods of carbon carbon composite material are mainly divided into two categories: vapor deposition and liquid phase impregnation, liquid phase impregnation is divided into resin impregnation and asphalt impregnation. The typical process of…
Graphite material has the advantages of high machining accuracy and good surface effect, especially in precision, complex, thin wall, high hardness material mold cavity processing has a greater advantage. brief introduction Graphite material has the advantages of high machining accuracy and good surface effect, especially in precision, complex, thin wall, Gao Ying material mold cavity processing has a greater advantage. Compared with copper, graphite material has the advantages of less consumption, high discharge speed, light weight, small thermal expansion coefficient, etc. Therefore, it has become the mainstream of the discharge machining materials. advantage One, fast speed; Graphite discharge faster than copper 2-3 times, the material is not easy to deformation, in the processing of thin reinforced electrode have obvious advantages,…
During the sintering process of graphite crucibles, the organizational structure of the green body has a series of changes, the changing part is mainly the plastic refractory clay. The basic process of the crucible sintering can be divided into the following four stages to illustrate: 1).Preheating and baking stage. The temperature at 100~300 degrees, it is the process of graphite crucibles exclude residual moisture.The heating speed should slow and the kiln roof should be open, it should control the temperature strictly especially when the graphite crucibles in the residual moisture content exceeds 3% , otherwise the crucibles will have the crack and it maybe explode. 2).Low temperature firing stage: 400-600℃ is the Low temperature stage of sintering of the graphite…
