Graphite crucibles are mainly used for the melting of metal materials, and they are divided into two categories: natural graphite and artificial graphite.
1) Natural graphite
It is mainly made of natural flake graphite as the main raw material, with the addition of clay and other refractory materials. It is generally called a clay graphite crucible, while a carbon binder type crucible made solely from the sintering force of clay is called a Hui clay binder type crucible. The former has superior strength and thermal shock resistance. It is used for the melting of steel, copper, copper alloys, and other non-ferrous metals, with various sizes and melting capacities ranging from 250g to 500kg.
This type of crucible includes accessories such as a skimming spoon, lid, joint ring, crucible support, and stirring rod.
2) Artificial graphite
The natural graphite crucibles mentioned above usually contain about 50% clay minerals, while the impurities (ash content) in artificial graphite crucibles are less than 1%, used for refining high-purity metals. There are also high-purity graphite that has undergone special purification treatment (ash content<20ppm). Artificial graphite crucibles are often used to melt small amounts of precious metals, high-purity metals, or high melting point metals and oxides. It can also be used as a crucible for gas analysis in steel.