To sum up the different uses (and causes) of various crucibles in ChemistryQuartz glass crucibles, for examplealumina crucibleGlass crucibles, iron crucibles, and the like are different and should be noted
2, can not touch the HF and, at high temperature, easy and caustic effects of carbonate and alkali metal.3. quartz crucibles are suitable for melting samples with K2S2O7, KHSO4 as flux, and treating samples with Na2S207 (first drying at 212 degrees) as flux4. quartz brittle, easy to break, use should pay attention to5. except for HF, ordinary dilute inorganic acid can be used as cleaning solutionAlumina crucible: 1. corundum crucible is made of porous fused alumina, which is compact and resistant to melting
Molten material with acid as flux (such as K2S, 207, etc.)Porcelain crucible: 1., heat resistance of about 1200 degrees2. suitable for K2S207 and other acidic substances melting samples3. generally can not be used for Na0H, Na202, Na2CO3 and other alkaline substances for melting flux, so as not to corrode the porcelain crucible. Porcelain crucible can not be contacted with hydrofluoric acid4. porcelain crucible can be diluted HCl boiling cleaningIron Crucible: iron does not react with sodium hydroxide, iron crucible can melt caustic soda, and iron crucible is used at 400 degrees or more. It is not economical, even if it is not melted, it also oxidizes rapidlyGraphite crucible: universal type graphite crucible and graphite crucible shaped and high pure graphite crucible three. Graphite crucible of various types, due to performance, and the use of different conditions, the raw material used, production method, technology and product specifications are different. Shi Mogan Guo is the main raw material, is the crystallization of natural shape it is graphite. It maintains the physicochemical properties of all kinds of natural right. That is: the original ink has good thermal conductivity and high temperature resistance, high temperature in use process, small thermal expansion coefficient, thermal quenching of, has a certain anti strain properties. The acid alkali solution, the corrosion resistance is strong, excellent chemical stability. The graphite crucible, because has more excellent performance, so in casting, metallurgy, machinery, chemical and other industrial sectors, is widely used for smelting alloy tool steel and non-ferrous metal and alloy smelting and has good. Technical and economic results
The quartz glass crucible can be used in the 1450 degrees below two points, transparent and opaque. With translucent quartz crucible arc method is drawing large diameter silicon based material is essential to the development of large scale integrated circuits. Nowadays, the semiconductor industry in the world developed countries have used the crucible instead of transparent quartz crucible is small. He has high purity, resistance strong heat, large size high precision, good heat insulation, energy saving, stable quality and other advantages.
