Introduction to the characteristics of quartz crucible

Quartz crucible is one of the products of quartz, and the use of quartz crucible is also very extensive. Let the quartz glass laser cutting manufacturers introduce some performance indicators and characteristics of quartz crucible!

1. Quartz crucibles can be used below 1450 degrees, and are divided into transparent and opaque. The translucent quartz crucible made by arc method is an essential basic material for drawing large-diameter single crystal silicon and developing large-scale integrated circuits. Today, developed countries in the world's semiconductor industry have replaced small transparent quartz crucibles with this crucible. It has the advantages of high purity, strong temperature resistance, large size and high precision, good heat preservation, energy saving, and stable quality.

2. Can not be in contact with HF. At high temperature, it is very easy to react with caustic alkali and alkali metal carbonate.

3. The quartz crucible is suitable for melting samples with K2S2O7 and KHSO4 as fluxes and treating samples with Na2S207 as fluxes.

4. Quartz is brittle and easy to break, so be careful when using it.

5. In addition to HF, ordinary dilute inorganic acids for quartz glass crucibles can be used as cleaning fluids.

The 18-inch and 20-inch quartz crucibles commonly used in China for pulling monocrystalline silicon are also used by manufacturers with 22 and above crucibles. At present, the technologies of 18-inch and 20-inch crucibles produced by domestic crucible manufacturers are relatively mature. The quartz sand used in its production is mainly imported from the United States. The purity of domestically produced quartz sand cannot meet its requirements. The impurities in the raw materials will produce black spots and bubbles during the high-temperature melting process during production, which will have a certain impact on the stability of single crystal silicon when it is drawn.

At present, the crucible production coating technology has been used by most manufacturers. It is to coat a layer of high-purity quartz sand on the surface of the crucible made of ordinary quartz sand to form a dense layer. React with quartz crucible to increase crystallization rate.