Silicon nitride material description:
Silicon nitride, chemical formula Si3N4, is a kind of important ceramic materials. It is a kind of super hard material, itself with lubrication, and wear resistance, as the atomic crystal; high temperature oxidation. But it can also resist the impact of hot and cold, the air is heated to 1000 ℃, rapid cooling and rapid heating, also won't break. It is because of silicon nitride ceramics is so excellent, people often use it to manufacture bearings, gas turbine blade, mechanical permanent mold ring, seals and other mechanical components. If the heating surface with high temperature resistance and not easy to manufacture silicon nitride ceramic heat engine components, not only can improve the quality of diesel engine, fuel saving, but also can improve the thermal efficiency. China and America, Japan and other countries have developed this kind of diesel engine.
Application of silicon nitride material:
Silicon nitride used as high-grade refractory materials, such as SiC combined with SI3N4-SIC refractory used for blast furnace and other parts; and the BN node cooperation SI3N4-BN material, used for horizontal continuous casting of separating ring. SI3N4-BN series horizontal continuous casting of separating ring is a fine structure of ceramic materials, uniform structure, high mechanical strength. The thermal shock resistance is good, and not by the steel liquid wetting, to meet the requirements of renju process.
Silicon nitride special double cone rotary vacuum drying machine working principle:
SZG double cone rotary vacuum dryer is a double conical rotary tank, equipment the middle cylindrical, both ends is conical, conical top head is designed to open the feeding (and manhole), another end for discharging valve. The tank body, is divided into three layers, the intermediate jacket heating medium can be steam, hot water or heat conducting oil circulation, heat preservation layer of alkaline superfine glass cotton, energy consumption; the inner layer on the material. When the tank in a vacuum state, the jacket is filled with heat conducting oil, hot water or steam, heat medium is heated, heat transfer to the wet material through the inner wall of the tank.
Because the vacuum state in the tank, the solvent of various materials (including water) under the condition of vacuum can be rapidly vaporized in temperature lower, and the rotary material is constantly on, both inside and outside the flip, material to continuously update the surface in contact with the wall, so as to make full use of the wall by conduction heat, drying speed, improve the drying efficiency, and can achieve the purpose of uniform drying.
Solvent wet materials after heat absorption evaporation (water vapor), through the vacuum pump vacuum suction tube is withdrawn. Midway through the low temperature condensation system (use tap water or frozen brine) for cooling, in order to achieve the purpose of recycling, saving the production cost, and improve the vacuum pump working conditions, but also reduce the pollution of the environment. |
