The main raw material for quartz crucibles is high-purity quartz sand, while corundum crucibles are composed of porous fused alumina, which has a relatively strong and melt resistant texture. Both have good high-temperature insulation and mechanical strength. The editor consulted the following materials to distinguish between the two:
Quartz crucible:
1. Cannot come into contact with HF, as it is more prone to react with caustic soda and alkali metal carbonates at high temperatures.
2. Suitable for melting samples with K2S2O7 and KHSO4 as fluxes, as well as treating samples with Na2S207 (dried at 212 degrees Celsius) as a flux.
3. The texture of quartz crucibles is brittle and easy to break, so special attention should be paid when using them.
Corundum crucible:
1. Suitable for melting samples with weak alkaline substances such as anhydrous Na2CO3, but not suitable for melting samples with strong alkaline substances such as Na2O2, NaOH, and acidic substances (such as K2S2O7).
2. Characteristics: High temperature resistance, acid and alkali resistance, rapid cooling and heating resistance, chemical corrosion resistance.
3. Shape: arc-shaped, cylindrical. Specification: 5-1000ml.
Based on the above information, we can distinguish between the two. Relatively speaking, quartz crucibles have large dimensions, high precision, energy savings, and relatively stable quality when applied. However, caution is required when using it as it is relatively easy to break.