A large crucible is an industrial equipment used to hold and heat a large amount of raw materials for melting, purification or chemical reaction. It is large in size and is usually used in high-temperature industrial fields such as metal smelting, ceramic manufacturing, and chemical experiments.
- Definition and Characteristics
Definition: A large crucible is a high temperature resistant container used to heat, melt or chemically react raw materials at high temperatures.
Features:
Large size: can hold a large amount of raw materials and is suitable for large-scale production.
High temperature resistance: Made of refractory materials (such as graphite, quartz, alumina, etc.), it can withstand extremely high temperatures.
Chemical stability: It is not easy to react chemically with molten materials at high temperatures, ensuring product purity.
- Application fields
Metal smelting: used to melt metals (such as steel, iron, copper, aluminum, etc.) for casting or alloy preparation.
Ceramic manufacturing: used for firing ceramic materials, such as high-temperature ceramics, electronic ceramics, etc.
Chemical experiments: used in laboratories for high-temperature reactions or material synthesis.
Semiconductor industry: used in the production of semiconductor materials such as single crystal silicon, such as the use of quartz crucibles in drawing silicon rods.
- Common types
Graphite Crucible:
Features: Good thermal conductivity and high temperature resistance, small thermal expansion coefficient, and certain resistance to strain from rapid heating and cooling.
Application: Widely used in metallurgy, casting, machinery, chemical industry and other industrial sectors.
Quartz crucible:
Features: high purity, strong temperature resistance, large size, high precision and good thermal insulation.
Application: It is used to pull large-diameter single-crystal silicon in the semiconductor industry and is an essential basic material for the development of large-scale integrated circuits.
Alumina crucible (corundum crucible):
Features: Alumina content exceeds 95%, hard and resistant to melting.
Application: Suitable for melting samples using some weak alkaline substances as flux.
Silicon carbide crucible:
Features: It can withstand higher temperatures than glassware and has good wear resistance.
Application: It has been widely used in industrial fields such as ceramics and glass.
- Manufacturing process
Isostatic pressing: Uniform pressure is transmitted through high-pressure liquid medium, so that the refractory raw materials are subjected to the same pressure in all directions, thus forming a crucible with high density, low porosity and high mechanical strength.
Sintering: The formed crucible needs to be sintered at high temperature to improve its refractory properties and mechanical strength.
- Advantages
Efficient production: Able to accommodate large amounts of raw materials and improve production efficiency.
Guaranteed purity: Good high temperature resistance and chemical stability to ensure the purity of the molten material.
Strong adaptability: It is not limited by production scale, batch size and smelting material types and can be selected arbitrarily.
- Notes
Safe operation: When operating large crucibles at high temperatures, safety regulations must be strictly followed to prevent burns or fire.
Regular maintenance: Cleaning and maintenance are required after use to extend the service life of the crucible.
Choose the right material: Choose the right crucible material according to the properties of the molten material to avoid chemical reactions or crucible damage.
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