Glass crucibles are key high-temperature containers used in glass manufacturing, melting and material processing. They are usually made of high-temperature and corrosion-resistant materials and can withstand the high temperature and chemical erosion of molten glass.
- Main types and materials
Quartz glass crucible
Features: high purity ( SiO₂ content >99.99%), high temperature resistance (up to 1600℃), low expansion coefficient, good thermal shock resistance.
Applications: semiconductor single crystal silicon pulling, optical glass melting, laboratory high temperature experiments.
Process: Through arc melting or centrifugal forming, the inner layer can form a transparent quartz glass layer.
Corundum crucible (alumina crucible)
Features: high hardness, high temperature resistance (melting point about 2050℃), chemical corrosion resistance.
Application: melting high temperature alloys, rare earth metals, and ceramic materials.
Platinum Crucible
Features: high purity (Pt≥99.95%), high temperature resistance, good chemical stability.
Applications: precision analysis, optical glass melting, and high-purity material preparation.
Graphite Crucible
Features: good thermal conductivity, high temperature resistance, and low price.
Application: Smelting of non-ferrous metals such as copper and aluminum, but not suitable for strong oxidizing environment.
- Application Fields
Glass Manufacturing
Used to melt glass raw materials (such as quartz sand, soda ash, limestone, etc.) and form uniform glass liquid through high-temperature melting.
Single crystal silicon pulling
The semiconductor industry uses high-purity quartz crucibles to pull single crystal silicon rods, which are the core material for integrated circuits and solar cells.
Optical glass melting
Used to manufacture high-precision optical components (such as lenses and prisms), the impurity and bubble content must be strictly controlled.
Laboratory studies
For high temperature experiments, material synthesis, chemical analysis, etc., it is necessary to select appropriate crucible materials according to the experimental conditions.
- Technical Features
High temperature resistance
It needs to withstand high temperatures above 1000°C, and some materials (such as graphite and molybdenum) can withstand higher temperatures.
Corrosion resistance
It is resistant to corrosion of glass melt and chemical reagents, and avoids the introduction of impurities.
Thermal stability
Keep the structure stable during high temperature and cooling process to avoid cracking or deformation.
High purity requirements
The semiconductor and optical fields require the use of ultra-high purity materials (such as quartz above 9N) to ensure product quality.
- Manufacturing process
Raw material selection
Select high-purity quartz sand, alumina powder, platinum and other raw materials according to application requirements.
Molding process
Formed by pressing, sintering, melting and other methods, some crucibles need surface polishing or coating.
Quality Control
Strictly test purity, density, thermal expansion coefficient and other indicators to ensure that the products meet the standards.
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