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Difference Between Graphite Crucible and Quartz Crucible
2024.05.07
1.Different material.
The main raw materials of graphite crucible are graphite and usually used for melting non-ferrous metals and their alloys, such as copper, gold, K gold, silver,alloys, etc.; The main raw material of quartz crucible is quartz sand, which is usually used in the laboratory to draw monocrystalline silicon, or to melt gold, palladium, stainless steel, iron, aluminum and other materials.
2.Different colors.
Graphite crucible is usually black or dark grey, and quartz crucible is white.
3.Different heating methods.
Because the graphite crucible contains resistance, when the high-frequency current passes through, the graphite crucible itself induces heat, which is used to heat metal materials; Because there is no resistance in the quartz crucible, when the medium frequency current passes through, the metal material in the quartz crucible generates induction heat, and the quartz crucible itself does not heat.
4.Different degrees of high temperature resistance.
Quartz crucible is more resistant to high temperature than graphite crucible, the maximum temperature of intermediate frequency melting furnace can reach 2600℃, usually used with quartz crucible; The maximum temperature of the high-frequency melting furnace is about 1600℃, and it is usually used with a graphite crucible.
5.The use of protection is different.
The graphite crucible usually needs to be equipped with a quartz jacket when in use, because the graphite is easy to oxidize at high temperatures, and the quartz jacket can play a protective role; The quartz crucible can be used alone and does not require additional protection.
6.Different thermal conductivity.
The thermal conductivity of graphite crucible is much better than that of quartz crucible,which makes graphite crucible more suitable for heat treatment and burning operations.
7.Different chemical stability.
Quartz has good high temperature stability and chemical stability, high melting point, low thermal expansion coefficient and excellent corrosion resistance, making it an ideal choice for high temperature experiments and heating processes. After high temperature treatment, the graphite crucible can withstand extremely high temperatures of up to 3000℃, and has a low coefficient of thermal expansion,which can reduce the influence of thermal stress.
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