Precautions for using niobium crucibles
When using niobium crucibles, you need to pay attention to the following points:
Before use, it must be slowly baked to 500 degrees Celsius.
Add materials according to the capacity of the crucible, and avoid squeezing too tightly to prevent the metal from thermal expansion and cracking the crucible.
When taking out the molten metal, it is best to scoop it out with a spoon and use calipers as little as possible. If calipers and other tools are used, they should be consistent with the shape of the crucible to avoid excessive local force and shorten the service life.
Avoid spraying strong oxidizing flames directly onto the crucible, which will cause the crucible raw materials to oxidize and short-life.
Niobium crucible composition parameters
|
Atomic Number |
41 |
|
Atomic Weight |
92.91 |
|
Density |
8.57 gm/cc (0.31 lbs/in2) |
|
Melting Point |
2468 °C |
|
Coefficient of Expansion (20°C – 100°V) |
7.1 x 10-6/°C |
|
Specific Heat (27°C) |
0.065 cal/gm/°C |
|
Thermal Conductivity |
0.125 cal/sec-cm-°C |
|
Electrical Resistivity (0°C - 100°C) |
14.5 microhm-cm |
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