The Ceramic crucibles is a ceramic product made of clay as the main raw material, usually containing other mineral components such as quartz and feldspar, through mixing, molding, drying and firing. It has a complex composition and relatively high impurity content and is a traditional refractory material.
Alumina crucible is a ceramic material made of high-purity alumina (Al₂O₃) as the main component, through special processes such as high-temperature sintering. The purity of alumina is generally above 92%, and the common purity levels are 92%, 95%, 99%, etc. It is a high-purity functional ceramic material.
The heat resistance of ceramic crucible is general, and it can usually be used at a temperature of about 1000℃, but it is more likely to deform or soften in a high-temperature environment and is not suitable for long-term exposure to extremely high temperatures.
Due to the complex composition and the presence of more impurities, it is easy to react with chemical substances such as acids and alkalis and has weak resistance to chemical erosion. Alumina crucibles have excellent high-temperature resistance. Alumina crucibles of different purities have different temperature resistance levels. For example, a 99.7% Al₂O₃ crucible can reach 1700℃, with a wide long-term working temperature range, can adapt to high-temperature environments and maintain good structural integrity.
Ceramic crucibles have low mechanical strength, relatively low hardness and strength, are easily damaged or broken by external impact or collision, and have limited bearing capacity. Alumina crucibles have high mechanical strength, and high-purity alumina gives them high hardness and strength. They can withstand large external forces without being easily broken and have good compression, bending and impact resistance.
Ceramic crucibles are relatively cheap, raw materials are easy to obtain, the manufacturing process is relatively simple, the cost is low, and they have a high cost-effectiveness. Alumina crucibles are relatively expensive. Due to their high-purity raw materials and advanced manufacturing process, the production cost is high and the price is relatively high.
Alumina crucibles have good chemical stability. The main component, Al₂O₃, does not easy to react chemically with most acids, alkalis, and reducing gases such as hydrogen and carbon monoxide within a certain concentration and temperature range, which can effectively ensure the purity of the melt and prevent pollution.
Ceramic crucibles are often used for basic experimental operations such as general heating, firing, and melting of common chemical substances in school laboratories, scientific research institutions, etc., and are suitable for some experimental scenes that do not require high-performance crucibles. Alumina crucibles are mainly used for high-temperature experiments, material synthesis, chemical reactions, and other experimental operations that require high precision and high purity in school laboratories, scientific research institutions, etc.
Ceramic crucibles are ideal for small-scale operations such as jewelry making, small-batch scrap metal recycling, and vocational training. They are often used in metal processing, glass production, and pigment production teaching in vocational schools and small enterprises.
Alumina crucibles are suitable for processes such as metal smelting and alloy preparation and can withstand the dual test of high temperature and chemical erosion. Alumina crucibles are used as reaction vessels in high-temperature chemical reactions to ensure the smooth progress of the reaction and the purity of the product. Alumina crucibles are also used in the synthesis, processing and performance research of materials, such as the preparation process of semiconductor materials and superconducting materials.