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Crucible is a common product in graphite nowadays, but many carbon people don't know much about this aspect, so today's article will give you a popular knowledge about graphite crucible
The crucible is a refractory graphite crucible mainly used for smelting special alloy steel, melting non-ferrous metals and their alloys, made of crystalline natural graphite as the main raw material, malleable refractory clay as the binding agent, with different types of clinker. In terms of product properties and applications, graphite crucibles are an integral part of refractory materials.
Crucibles can be divided into three main categories: graphite crucibles, clay crucibles and metal crucibles. In between, there are three types of graphite crucibles: plain graphite crucibles and shaped graphite crucibles and high-purity graphite crucibles. Each type of graphite crucible has different raw materials, production methods, processes and product specifications due to different properties, applications and use conditions.
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 coefficient of thermal expansion during high temperature use, and a certain strain resistance to rapid cold and heat. It has good corrosion resistance and excellent chemical stability to acid and alkali solutions. , , and
Graphite crucibles are available in a wide range of models and sizes, which can be selected at will, regardless of production size, batch size, and type of melted material, and are highly applicable and can guarantee the purity of the melted material.
Graphite crucibles, because of the above-mentioned excellent properties, are widely used in metallurgy, foundry, machinery, chemical industry and other industrial sectors for smelting of alloy tool steel and melting of non-ferrous metals and their alloys. It has good technical and economic effect.
The types of crucibles are roughly divided into three main categories: the first type of copper melting crucible with the specification "No.",; the second type of crucible for copper alloy smelting, No. 100 outer and No. 100 round, and the third type of crucible for steel smelting, No. 100.
Crucible specifications (size) are usually indicated by the size of the serial number, being crucible No. 1, whose volume is capable of melting 1000 grams of brass weighing 180 grams. When melting different metals or alloys, the melting volume in the crucible can be calculated by multiplying the number of crucible capacity specifications by the corresponding metal and alloy coefficients.
The raw materials used to produce crucibles can be grouped into three main types. The first is crystalline natural graphite, the second is malleable refractory clay, and the third is calcined hard kaolin-like skeletal clinker. In recent years, high-temperature-resistant synthetic materials such as silicon carbide, alumina adamantine and ferrosilicon have been used as skeletal clinkers for crucibles. This clinker has a significant effect on improving the quality of the crucible product and enhancing the density and mechanical strength of the crucible.
There are three methods of crucible molding; the more primitive and ancient method of molding is hand molding. The second method is rotational molding and the third method is compression molding.
Graphite crucible is a high grade refractory vessel made of natural scale graphite, wax stone, silicon carbide and other raw materials, which is used for melting, melting and casting copper, aluminum, zinc, lead, gold, silver and various rare metals.
1、Please put it in dry place after use and avoid rainwater intrusion; bake it slowly to 500 degree Celsius before use. 2、Add materials according to the capacity of crucible, avoid squeezing too tightly so that the crucible will not break due to metal expansion.
3、When removing the molten metal, it is best to scoop it out with a spoon and use calipers sparingly; if using tools such as calipers, they should match the shape of the crucible to avoid shortening the service life due to excessive local forces.
4、The service life of crucible is related to the usage, avoid strong oxidation flame spraying directly to the crucible, which will shorten the life of crucible raw material oxidation.