The quartz ceramics is the sintering body of amorphous silicon dioxide made of special processing means and has excellent thermal shock resistance.. In addition, the quartz ceramic body shrinkage is less than 6%, easy to make size accurate products, is a good development and Utilization Prospect of heat resistant ceramic material. If quartz glass waste or fused silica was used as raw material, the sintering body of the compact ceramics can not be made according to the conventional process, that is, the water absorption of quartz ceramics is less than 2%.. Large size square quartz ceramic crucible is solar battery polysilicon ingot production with the main material consumption, due to conditions of use is extremely demanding, the crucible of purity, strength, appearance defects, inherent quality, high temperature properties, thermo stability, dimension precision have very strict requirements. The only master manufacturers of quartz ceramic injection molding and gelcasting technology is a company in the United States, so only a few have the polycrystalline silicon ingot furnace manufacturers are dependent on imports, sigle crucible price up to more than $700, the annual output of 10MW silicon chip factory production with four sets of 240 kg ingot furnace for 668 quartz ceramic crucible consumption calculation. According to the existing domestic production capacity calculation, the number of imported crucible reaches more than 6800, after the expansion of the total demand will be more than 15000. Many manufacturers are studying a kind of quartz ceramic crucible structure, dense and uniform, the overall performance of uniform, the crack resistance of products, good thermal stability and the casting ingot crucible crucible sintering process. The production process of quartz ceramics is described as follows.

Quartz ceramic products are mainly used in raw materials for fused quartz fragments, the chemical consists of SiO2 98.25%; Al2O3 0.15%; FeO3 0.13% free carbon 0.21%; cauterize 0.17%. The selection of additives raw materials for industrial minerals or chemical reagents, such as boron magnesium stone, Howlite, Ling ore, lithium carbonate, alumina industry. Smash the fused silica raw material to all through 100 mesh sieve, and then use 200 mesh sieve, the next material for fine grinding head material, the screen material for two materials.

In fine milling, milling for rubber lining, with agate ball as a grinding body. The slurry was reached for fineness, and the dry green body after the mold was formed by plaster cast and cast.. The impregnated billet is calcined at about 1100 degree, and the high strength is formed, and the dipping solution is the upper colloid dissolved in the mud after 24 hours.. Introduced in the formulation of additives for does not affect the performance of the slurry forming, the mixed grinding additives of the raw materials, the 980-1000 DEG C high temperature synthesis. The sintered body is crushed and the head is finely ground.. Burn to develop a strict temperature curve, burn into a temperature of 1200 degrees, heat preservation weight for 5 minutes.

The raw materials of fine grinding, influence of feeding method on the green density and sintering grouting. The experimental results show that the sintering mechanism of the quartz ceramics is mainly the surface diffusion of solid phase and the diffusion of the body. Therefore, the density of the solidified body and the proportion of the fine particles can be improved.. The two way of feeding fine raw materials can improve the density and sintering. This is because a feed most of the particles for intermediate particles, secondary feeding middle size particle content is less, so injection molding process can produce dense poly packing, high green density. The density is large, the contact area between particles is large, providing favorable conditions for sintering diffusion. At the same time, the appropriate time of the ball milling, the specific surface area of the particles in the body, can also promote the compact sintering of the body.. But the milling time is too long, may change the raw material reasonable distribution of particles, the density decreased, should strictly monitor.