What is a quartz ceramic crucible?

　　Quartz ceramics are products made from timely glass or melted timely glass through a series of manufacturing processes such as crushing, molding, and firing.

　　Quartz Ceramic crucible It is a high-melting-point timely ceramic, while quartz Ceramic crucible is known as high-melting-point timely Ceramic crucible ，is made from high-melting-point quartz. Generally speaking, its shape is mainly square and cylindrical. Among them, square quartz Ceramic crucible is used as a container for polysilicon and crystal growth during the polysilicon ingot casting process. Circular high-purity timely crucibles are used for single crystal growth in single crystal silicon pulling. Solar cells, as a clean energy source, have received widespread attention worldwide. Among them, polycrystalline silicon solar cells have stable conversion efficiency and high cost performance. Currently, casting polycrystalline silicon solar cells has become an important photovoltaic material, and almost all photovoltaic cells on the international market are made of high-purity polycrystalline silicon materials. The crucible is a container for loading polysilicon during smelting and ingot casting, and is an indispensable key material.

　　In the process of melting polysilicon ingots, the container for loading polysilicon is strictly required, and the following conditions should be met:

　　1. Can work continuously at 1500°C for more than 40 hours;

　　2. The main components of the crucible are similar to polysilicon materials;

　　3. Good thermal shock stability, low thermal expansion coefficient, good high-temperature deformation resistance, high volume density, and physical properties such as bending strength;

　　4. The crucible has strict requirements on purity, strength, and dimensional accuracy.

　　At present, timely ceramics have been recognized by the solar energy silicon production industry and field for their excellent performance. The rapid growth of the photovoltaic industry has driven the development of polysilicon ingots, so the demand for quartz Ceramic crucible is increasing.

　　Quartz Ceramic crucible The material matrix is quartz, quartz Ceramic crucible has two types of raw materials: one is natural quartz sand, with a total impurity content of generally less than 40 ppm. The raw materials of the crucible should have high purity, good consistency, and uniform particle size distribution. When the content of harmful components is high, it will affect the melting and temperature resistance of the crucible, resulting in bubbles, stains, and peeling. In severe cases, it will cause the crucible to soften and leak silicon in time. The other is high-purity synthetic raw materials, which have high purity but are expensive and have a low softening point. Many crucible manufacturers use this raw material to sinter a transparent layer of about 0.5-1 mm in the inner layer of the crucible, which ensures the purity of the inner surface of the crucible and prevents the softening point of the crucible from being too low.

　　Quartz Ceramic crucible Crystallization, deformation, and cracking will occur during use. In order to prevent silicon material contamination, the crucible can only be used once, so timely crucibles are consumable containers in silicon crucible production. With the continuous expansion of China's solar energy silicon ingot production capacity, the demand for corresponding crucibles is increasing, and its consumption and waste are also increasing. In addition, there are many factors such as high technical difficulty and high production cost in repurifying high purity from waste crucibles. Therefore, at present, the discarded timely crucibles produced by photovoltaic enterprises are only stacked or buried as waste, which puts great pressure on the environment and is also a waste of resources. Ceramic crucible The reuse of waste quartz is becoming increasingly prominent.