Quartz crucible, also known as quartz sand crucible, is a kind of crucible made of quartz sand, which is a sub-product of quartz glass products. It has a wide range of applications in photovoltaic and semiconductor fields, mainly used to support continuous crystal pulling under high temperature conditions, and is a consumable quartz device for loading polysilicon raw materials.

So what are the performance characteristics of quartz crucibles?

1. High temperature resistance

Quartz crucibles have excellent high temperature resistance. From the perspective of physical and thermal properties, its deformation point is about 1100 ° C, softening point is 1730 ° C, and the maximum continuous use temperature can reach 1100 ° C, and even 1450 ° C in a short time. This high temperature stability allows quartz crucibles to maintain a stable form in extremely high temperature environments, making them indispensable materials for high temperature processes such as drawing single crystal silicon.

2. Cleanliness and homogeneity

Quartz crucible has high cleanliness and homogeneous properties. Its main chemical composition is silica, which does not react with other acids except hydrofluoric acid, showing good chemical stability. This cleanliness and homogeneity can ensure the purity and consistency of the drawn single crystal silicon, which is a key accessory for the manufacture of high-precision products such as integrated circuits and microelectronic devices.

3. High strength and stability

Quartz crucibles need to maintain sufficient strength and stability in high temperature environments. During the process of drawing silicon rods, it is usually carried out in a high temperature environment around 1420 ° C, when the quartz material will soften. If the strength of the quartz crucible is insufficient, it may deform and collapse, which directly causes the growth crystal to stop, causing serious losses. Therefore, quartz crucibles need to have high strength to ensure stable morphology and strength in high temperature environments.

4. Insulation and energy saving performance

Quartz crucibles have good thermal insulation properties, which can effectively reduce heat loss and save energy. Especially in the process of drawing single crystal silicon, the thermal insulation properties directly affect the growth rate and quality of crystals. The thermal insulation properties of quartz crucibles enable uniform heat distribution, thereby improving the success rate of crystal growth and the quality of crystal rods.

5. Transparent layer and bubble structure

Quartz crucibles have a multi-layer composite structure. Generally, the innermost layer is a transparent layer, and the thickness accounts for 1/3 of the wall thickness, about 3-5mm, and the bubble content is low. The outer layer has a higher bubble content, which supports the deformation strength of the quartz crucible and ensures the uniform radiation of the heat source. With the progress of technology, quartz crucibles have developed a three-layer structure with a transparent layer, a bubble transparent layer, and a thin bubble layer on the outer layer to further improve their performance.

6. High purity and trace element control

The purity of the quartz crucible has an important influence on the purity of the drawn single crystal silicon. High purity quartz sand is the core raw material of the quartz crucible, and its purity significantly affects the crystal pulling effect. The raw materials of the quartz crucible require high purity, good consistency and uniform particle size distribution. When the content of harmful components such as Al, Na, K, Li, Cu, Mn, Fe and other elements is high, it will affect the melting of the crucible, and there will be bubbles, stains, peeling and other phenomena. In severe cases, the quartz crucible softens and leaks silicon.

7. Application and maintenance

Quartz crucible is mainly used in photovoltaic and semiconductor fields, and is a key auxiliary material for drawing monocrystalline silicon. It is suitable for growing semiconductor monocrystalline silicon and photovoltaic monocrystalline silicon, which are used in the manufacture of integrated circuits, microelectronic devices and solar cells, photovoltaic modules, etc. The use and maintenance of quartz crucible should be careful to avoid contact with hydrofluoric acid, and it is easy to react with caustic alkali and alkali metal carbonates. At the same time, quartz crucible is brittle and easy to break, and special care should be taken when using it.

Quartz crucible plays an important role in the photovoltaic and semiconductor fields because of its high temperature resistance, clean homogeneity, high strength and stability, heat preservation and energy saving, multi-layer composite structure, high purity and trace element control.

Luverre Quartz manufactures and sells a wide range of high quality quartz glass, including quartz tubes, quartz plates, quartz rods, quartz windows, quartz crucibles, quartz boats, quartz flanges, quartz beakers, quartz glass instruments, and more. We can meet all kinds of customized requirements for quartz glass products.