How high is the resistance of ceramic crucibles to high temperatures
Release time:
2023-01-04
The porcelain crucible depends on the formula. If ordinary clay can only withstand around 600. If other ingredients are added, the bearing temperature will also increase significantly Porcelain crucible is a chemical laboratory product, mainly composed of alumina (45-55%) and silica. Suitable for molten samples of acidic substances such as K2S2O7. Generally, it cannot be used for melting with alkaline substances such as NaOH, Na2O2, Na2CO3 as fluxes to avoid corrosion of porcelain crucibles. Porcelain crucibles should not come into contact with hydrofluoric acid.
The porcelain crucible depends on the formula. If ordinary clay can only withstand around 600. If other ingredients are added, the bearing temperature will also increase significantly
Porcelain crucible is a chemical laboratory product, mainly composed of alumina (45-55%) and silica. Suitable for molten samples of acidic substances such as K2S2O7.
Generally, it cannot be used for melting with alkaline substances such as NaOH, Na2O2, Na2CO3 as fluxes to avoid corrosion of porcelain crucibles. Porcelain crucibles should not come into contact with hydrofluoric acid.
Porcelain crucibles can generally be washed by boiling with dilute HCl.
Porcelain crucibles can be divided into: medium wall crucible, low wall crucible, high wall crucible, plain crucible, volatile crucible, tight crucible, Rogar crucible, double layer crucible, Gucci crucible, fine hole crucible, infrared carbon sulfur crucible, Free expansion coefficient crucible, etc.
Ceramics have water absorption properties. Therefore, in order to reduce errors, the crucible should be strictly dried before use and then weighed on the Analytical balance. Sometimes the analyte is filtered using ashless filter paper, and the filter paper is placed together in a crucible; This filter paper completely decomposes in a high-temperature environment and will not affect the results. After high-temperature treatment, dry and cool the crucible and its contents in a specially designed dryer before weighing. Clamp the whole process with clean crucible tongs.
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