China is one of the countries with the most abundant graphite reserves in the world, and graphite is widely used in industry. As graphite is the most heat-resistant mineral, it is widely used in industry for graphite crucible, magnesium carbon brick and other products.
The application of graphite to high temperature resistance in industry.
1.Graphite crucible with high temperature resistance.
Graphite crucible has good thermal conductivity and high temperature resistance. In the process of using high temperature, the thermal expansion coefficient is small, and it has certain anti-strain performance for quick heat and cold. It is widely used in alloy tool steel smelting because of its strong corrosion resistance to acid and alkali solubility and good chemical stability.
2. Magnesia carbon brick made of graphite with high temperature resistance.
High melting point magnesium oxide and flake graphite are used as raw materials for magnesia carbon brick. Magnesium-carbon bricks are commonly used in the metallurgical industry.
Second, why graphite has high temperature resistance.
Graphite is an atomic crystal, and carbon atoms are connected by covalent single bonds to form a stable regular hexagon network structure. A covalent single bond is a bond that has a high bond energy and requires a high amount of energy to break. So, the melting point of graphite is very high, about 3,850 degrees, and the boiling point is 4,250 degrees, and even after ultra-high temperature arc burning, the loss of weight is very small, and the thermal expansion coefficient is very small.
The high temperature resistance of graphite is used to make graphite crucible in metallurgy, casting, machinery, chemical industry and other industrial sectors. There are many kinds of equipment made of graphite, and there is a large demand in industry. Many high-temperature materials, such as crucible, firebrick and casting mould detergent, used in the smelting of precious metals, are made of graphitized embryos.