Difference between quartz crucible and graphite crucible

1. Colour

The graphite crucible is black cup-shaped and the quartz crucible is white cup-shaped.

2. Heating mode

1. There is resistance in graphite

(1) When the high-frequency current passes through, the graphite crucible heats the metal material through its own induction heating.

(2) Smelting range: copper, gold, K gold, silver, alloy, etc.

2. Quartz has no resistance

(1) When the medium frequency current passes through, the metal material in the quartz crucible generates induction heating.

(2) Quartz crucible does not generate heat. It is suitable for smelting: gold, palladium, stainless steel, gold, iron, aluminum, etc.

3. Melting

1. Graphite crucible

Many kinds and a small amount of alloys can be melted. When we need to change the type of alloy, we just need to exchange graphite crucibles.

2. Quartz crucible

If the melting temperature exceeds 1800 ℃, sodium thiosulfate (dried at 212 ℃) and potassium bisulfate (sodium) can be used as flux.

Quartz crucible is more resistant to high temperature than graphite crucible.

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