The geometric size and appearance of the quartz crucible are determined by the production process, while the purity is determined by the raw materials. The raw materials for quartz crucible require high purity, good consistency and uniform particle size distribution. When the harmful components are high, the melting process of the crucible will be affected, and its temperature resistance will be affected. There will be bubbles, color spots, peeling and other phenomena, which will seriously affect the quality of the quartz crucible.
In recent years, with the continuous reduction of the cost of crystal pulling, some single crystal manufacturers choose some quartz crucibles made of domestic quartz sand in the market. Although domestic quartz sand crucible has won a place in the market. However, it should be noted that there is still a certain distance between domestic sand crucible and imported high-quality quartz crucible in terms of technology and product performance.
The domestic quartz crucible has the advantages of low softening point, short service life and easy sinking. Once the single crystal is jammed, it is difficult to grow single crystal after several remelting. In addition, after the quartz crucible subsides, the graphite crucible is exposed, which causes the carbon content to exceed the standard. In addition, there are many bubbles on the inner surface of the crucible, and there are many impurity spots and spots on the inner surface of the crucible.
Therefore, the material selection of quartz crucible is very important to the yield and quality of the crystal.
