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Glass can be worked in a furnace, just like the glass blowers. It will soften and glow and is fun to play with.
It will shatter if it is not above about 600 degrees and pushed in the fire. That is about the tempering temperature for glass things blown and made by hand. (down to 450). Things just made have to be tempered to remove the stress. Glass shards finely broken are commonly used on brass to keep down the casting of fumes from the zinc burning off. It is hooked out as a sticky mass just before pouring, or making additions as a prelude to pouring.
I have destroyed dramatically, three clay crucibles, of about a gallon size. One I tried to grip the edge with tongs and raise it from the furnace, WRONG! Only part full it flexed and tore right down the side, spilling into the furnace. Had to pull the base block and the congealing Aluminum out of the bottom. The next day reset the base block on sand& furnace clay and dried it up. Second simply dropped on the floor, cold, it shattered like a clay flower pot. Third I was in a hurry to fire, and did not give time to remove the moisture from long idle time. It popped and crackled and shed the outer skin of itself, in the too hot furnace.
Always use picking tongs to lift the crucible out, and set it in a pouring shank. Make sure your shank has a cross rod, or holding hooks on the pouring side to keep it in the loop, of the shank.. Always wear a head cover and safty glasses at the minimum, in case you get some steam pops. Never leave a skull in the vessel, pig out, as the expansion upon heating can damage the bottom and sides. A vessel full of cold metal is a complete loss, ask me how I know..
I once poured a mold set out the night before, and had a sizable pop when I poured the first cup of aluminum in. I ruined the timing of the pour, so we shook it out to remake the mold in a hurry and try to repour.
We killed a mouse that was trying to build a nest in the flask only overnight. Yechh!
Big Dave, former Millwright, Electrician, Environmental conditioning, and back yard Fixxit guy. Now retired, persuing boats, trains, and broken relics.
We have enough youth, how about a fountain of Smart. My computer beat me at chess, but not kickboxing
It is not getting caught in the rain, its learning to dance in it. People saying good morning, should have to prove it.
In induction melting, the difference between quartz crucible and graphite crucible mainly lies in the heating method and melting range.
The main differences are as follows：
The quartz crucible is a white cup, and the graphite crucible is a black cup.
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The quartz crucible is non-conductive, so it will not heat up by itself when the intermediate frequency current passes. Only the metal material being melted will be heated during the heating process.
The graphite crucible is conductive, and it will heat itself when a high-frequency current passes through it. Metal materials are heated by their own induction heating.
Therefore, graphite crucibles are also used to heat non-metallic materials.
Quartz crucibles are more resistant to high temperatures than graphite crucibles. The maximum temperature of the intermediate frequency melting furnace is 2600°C, equipped with a quartz crucible; the maximum temperature of the high-frequency melting furnace is 1600°C, equipped with a graphite crucible.
Quartz crucibles are suitable for melting iron, aluminum, stainless steel, platinum, gold, palladium, etc.
Graphite crucibles are suitable for melting copper, brass, gold, silver, zinc, lead, and other non-ferrous metals and their alloys.
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