Alumina (Al2O3) Crucibles
Alumina crucibles (Al2O3) are widely used due to its versatility and its low cost. It is the most commonly used crucible for lab research use. The material has a high melting point is and relatively chemically inert. MSE Supplies offers a wide variety of shapes and sizes of Alumina crucibles.
Why are crucibles made of graphite?
Graphite is a good conductor of heat and electricity. … Chemically, graphite is stable and inert with most elements. Being resistant to chemicals and having a high melting point and also because it is a good conductor of heat, graphite is used to make crucibles.
Can I make a crucible at home?
You can make yours off scrap steel in your home. If you are using the same steel as the creator, you will need to cut out the base of the crucible from the steel plate and get-ready the square steel tubing. … This crucible is only ideal for melting aluminium, anything above 760 degrees would melt the crucible.
Can you use stainless steel as a crucible?
Stainless steel crucibles can be used in cryo applications.
Are graphite crucibles good?
Graphite crucibles are high quality melting crucibles. They can be used at temperatures up to 1600C (2900oF) and are suitable for melting and refining precious metals, base metals, and other products. … If you want to coat the inside of the crucible with borax, go ahead as it probably will not hurt anything.
How hot can graphite get?
Graphite can be heated up to 3000°C and more, and is indeed used as heating element in some high-temperature furnaces. Moreover, it is also used as susceptor in induction furnaces, reaching 3000°C without problem.
What is clay graphite?
Indux is a high quality ceramic bonded clay graphite crucible range manufactured to provide controlled graphite alignment and optimised electrical properties to suit specific frequency ranges for induction melting applications. … Indux crucibles are typically used to melt copper alloys and precious metals.
What can be used in place of a crucible?
molybdenum and tungsten crucibles are alternative choices. Hi Sivaranjani, Nothing except platinum-rhodium will work to melt these glasses without contamination. Any ceramic crucible will be a single use thing and is bound to give you an impurity.
What is the difference between melting and smelting?
Melting is the process of liquefying a solid substance by heating. … Both processes involve heating a substance into a higher temperature. The main difference between melting and smelting is that melting converts a solid substance into a liquid whereas smelting converts an ore to its purest form.
Can you use steel as a crucible?
Yes if it is thick steel and not just like a coffee can. It will degrade over time but at aluminum temperatures it should last more than long enough for multiple uses. How thick are we talking ? old fire extinguishers seem to work well.
What is platinum crucible?
These crucibles offer high temperature strength and high melting point. Platinum offers oxidation resistance in air and oxygen; and corrosion resistance in acids and melted salts. … Lids, crucibles, and tongs sold separately. ₹380,000.00 – ₹640,000.00INR / Each. 9 variations of this product are available.
Is it toxic to burn graphite?
When you burn graphite, you get two products: carbon monoxide and carbon dioxide. … It is not poisonous per se, but if you have a fire and carbon dioxide displaces the air from the room, you cannot breathe carbon dioxide and you will suffocate.
Can you burn pencils?
Pencil lead will not burn effectively for the first reason as clay is non-combustible and smothers any fire load. If you did have pure graphite to burn, a simple flame wouldn’t be hot enough to combust it. You need to sustain temperatures of around 1000−2000 ∘C in order for pure carbon to burn.
Does graphite burn like coal?
It is often incorrectly assumed that the combustion behavior of graphite is similar to that of charcoal and coal. Numerous tests and calculations have shown that it is virtually impossible to burn high-purity, nuclear-grade graphites. … After removing the heat source, the graphite cooled to room temperature.
Are graphite crucibles conductive?
Characteristics of graphite crucible Graphite crucible has good thermal conductivity and high temperature resistance. … The high density of graphite crucible makes the crucible have the best thermal conductivity, and its thermal conductivity is obviously superior to other imported crucibles; 2.
How big is a 4 kg crucible?
Measurements: 5-1/4″ high x 4-3/4″ in diameter (exterior dimensions); 4-3/4″ deep x 3-3/4″ in diameter (interior dimensions). *The “#” in title represents the amount of aluminum that the crucible can accommodate (in pounds); the “Kg” is for the amount of kilograms of brass and copper capacities.
Can you melt aluminum in stainless steel?
From experience, stainless steel containers, as well as regular steel containers, will slowly dissolve into the aluminum.
Can you use a steel crucible to melt copper?
Insert the crucible.
Crucibles are made of steel, silicon carbide, and often clay graphite. They resist high temperatures and will hold and heat the copper you are melting.