News
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…
Carbon fiber reinforced silicon carbide (C / SiC) ceramic matrix carbon composites (CMC), the silicon carbide ceramic matrix instead of the carbon matrix, because it has good oxidation resistance, high temperature thermal shock resistance, thermal conductivity and carbon fiber with good compatibility has become in the fields of aviation and aerospace very promising a new generation of high temperature structural materials. Now, there are different methods to prepare /SiC C ceramic matrix composites, such as hot pressing method (HP), chemical vapor infiltration method (CVI), liquid silicon infiltration method (LSI), precursor conversion method (PIP) and so on. Most of these methods can not be used to realize the low cost of ceramic matrix composites. The method of liquid silicon infiltration (LSI)…
In July 2012, scientists at the Keel University and the University of Hamburg, Germany, developed the Flying graphite The world's lightest material "flying graphite" (Aero graphite), its density is only 0.2 mg / cubic centimeter, replaced the air gel became the world's lightest material. Looks like a black opaque sponge, made up of 99.99% air. This new material has a stable performance, good electrical conductivity, ductility and very strong. It is composed of a porous carbon annotate in the nanometer and micron scale, which is composed of a mesh structure. Although its quality is very light, but the flexibility is very good, has a strong anti compression capacity and tension load. It can be compressed to 95%, and then restored…
