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Johnson Tools 80X80mm Grey Carbon Crucible (Pack of 3)
by Johnson Tools
Features |
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Brand Name : | Johnson Tools |
Weight : | 1.74 Kg |
Country of Origin : | India |
Capacity : | 1 kg approx |
Color : | Grey |
Size : | 80X80 mm |
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Johnson Tools Graphite crucible is 80X80mm Pack of 3 generally used in alloy steel smelting and smelting of nonferrous metals and their alloys. The Crucible is made up of pressed graphite with bottom lid fitted on it. The use of graphite material for crucible is due to its high density, corrosion resistance, high temperature, heat and fast, high thermal shock resistance, attractive appearance. Graphite crucible can be used for melting various metal like gold, silver, copper, aluminium, lead, zinc, brass and other non-ferrous metals. Different capacity of the crucibles will be different depending on the atomic mass of each metal.
When the temperature reaches above 1000 °C (1832 °F), there will be an evaporation of carbon from the surface of the graphite and the solid spongy graphite structure begins to disintegrate. This leaves a porous structure which enables further oxidation to occur. This oxidation takes place at a much slower rate than that observed with pure graphite. Thus a "self-healing" action occurs whereby after the crucible has cooled down again the oxide layer reforms over the damaged part but in a less dense form than before so that it can withstand higher temperatures without disintegration occurring again.
The process works because most metals form an alloy with carbon at high temperatures. Melting of the alloy then frees up the metal, which can then be collected at low temperatures
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1,799
(GST inclusive price)
1,525
(GST extra)
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