What Is The Main Use Of Graphite Crucible

Crucible is now a common product in graphite, but many carbon people do not know much about this aspect, so today's article will give you the knowledge of graphite crucible
The crucible is a refractory graphite crucible mainly used for smelting special alloy steel, melting non-ferrous metals and their alloys. It is made of crystalline natural graphite as the main raw material, malleable refractory clay as the binder, and different types of clinker. In terms of product performance and use, graphite crucible is an indispensable part of refractory materials.
Crucible can be divided into three categories: graphite crucible, clay crucible and metal crucible. There are three types of graphite crucible in the middle: ordinary graphite crucible and profiled graphite crucible and high purity graphite crucible. Due to the different performance, use and use conditions, each type of graphite crucible has different raw materials, production methods, processes and product specifications.
The main raw material of graphite crucible is natural graphite in crystalline form. Therefore, it maintains the original physical and chemical properties of natural graphite. It has good thermal conductivity and high temperature resistance, small thermal expansion coefficient in the process of high temperature use, and has a certain strain resistance to rapid hot and cold. It has good corrosion resistance and excellent chemical stability to acid and alkali solutions.
Graphite crucible has a variety of models and specifications, can be arbitrarily selected, regardless of the production scale, batch and type of melting material, and has a high degree of applicability, and can ensure the purity of the melting material.
Graphite crucible, because of the above excellent properties, so in metallurgy, casting, machinery, chemical industry and other industrial sectors, is widely used in alloy tool steel smelting and non-ferrous metals and their alloys melting. It has good technical and economic effect.
The types of crucible are roughly divided into three categories: the first type of copper melting crucible, its specification "No."; Crucibles of the second type, No. 100 outer circle and No. 100 circle, for copper alloy smelting, and crucibles of the third type, No. 100, for iron and steel smelting.
The crucible specification (size) is usually expressed by the size of the serial number, which is the No. 1 crucible, and its volume can melt 1000 grams of brass weighing 180 grams. When melting different metals or alloys, the melting amount in the crucible can be calculated by multiplying the number of capacity specifications of the crucible by the corresponding metal and alloy coefficients.
The raw materials for the production of crucible can be summarized into three main types. The first is crystalline natural graphite, the second is malleable fireclay, and the third is calcined hard kaolin like bone clinker. In recent years, high temperature resistant synthetic materials such as silicon carbide, alumina amantadane and ferrosilicon have been used as the skeleton clinker of crucible. The clinker has a significant effect on improving the quality of crucible products and enhancing the density and mechanical strength of crucible.
There are three methods of crucible molding, the more primitive and ancient molding method is manual molding. The second method is rotary molding, and the third method is compression molding.
Graphite crucible is a high-grade refractory container made of natural flake graphite, wax stone, silicon carbide and other raw materials, used for melting, melting and casting copper, aluminum, zinc, lead, gold, silver and various rare metals.
1, please place in a dry place after use to avoid rain intrusion; Slowly bake to 500 degrees Celsius before using.
2, according to the capacity of the crucible to add materials to avoid too tight extrusion, so as not to expand the metal and make the crucible break.
3, when taking out molten metal, it is best to scoop out with a spoon, and use calipers as little as possible; If calipers and other tools are used, they should be matched with the shape of the crucible to avoid shortening the service life due to excessive local force.
4, the service life of the crucible is related to the use, to avoid the strong oxidation flame directly into the crucible, so that the crucible raw material oxidation life is shortened.