Coal asphalt manufacturer Shi Shan
I. Introduction. Modified coal pitch is a substance extracted from coal through pyrolysis and modification processes, and its chemical and physical properties are between petroleum asphalt and coal tar. In recent years, with the development of science and technology, modified coal asphalt has been widely used in many fields, especially in the manufacture of graphite crucibles.
Second, the characteristics of modified coal asphalt.
Modified coal pitch has high cohesiveness, thermal stability, oxidation resistance and corrosion resistance, as well as good lubricating properties and low vapor pressure. These properties make modified coal pitch an ideal material for graphite crucible manufacturing.
3. The role of modified coal asphalt in graphite crucible.
1.Binder: Modified coal pitch has strong cohesiveness and is able to bond graphite particles together to form a complete crucible structure. This gives the graphite crucible good integrity and strength.
2.Antioxidants: Some components in the modified coal pitch have good oxidation resistance, which can effectively delay the oxidation process of the graphite crucible at high temperature, thereby improving the service life of the crucible.
3.Corrosion Resistant: Modified coal pitch can also provide some corrosion resistance, preventing graphite crucibles from being corroded by acidic or alkaline melts.
4.Lubricants: The lubricating properties of modified coal pitch help to reduce the friction of graphite crucibles during use, thereby improving the wear resistance of crucibles.
5.Reduced vapor pressure: The lower vapor pressure of modified coal pitch can prevent the graphite crucible from generating excessive vapor pressure due to high temperature during use.
Fourth, the application of modified coal asphalt in the manufacture of graphite crucible.
In the manufacture of graphite crucibles, modified coal pitch is mainly used for coating and impregnation treatment. First, graphite particles are mixed with modified coal pitch to make a viscous mixture. This mixture is then applied to the inner and outer surfaces of the crucible, or graphite particles are directly impregnated with modified coal pitch to form a protective layer. After high temperature treatment, the modified coal pitch forms a strong protective film that improves the strength, oxidation resistance and corrosion resistance of the graphite crucible.
V. Conclusions. In summary, modified coal pitch plays a vital role in the manufacture of graphite crucibles. Its adhesion, oxidation resistance, corrosion resistance, lubricity and low vapor pressure make graphite crucibles have better performance and service life. With the development of science and technology and the increase of industrial demand, the application of modified coal asphalt in the manufacture of graphite crucible will be more extensive, and its importance will continue to increase. Therefore, it is of great significance to study the characteristics and applications of modified coal asphalt in depth to improve the performance and service life of graphite crucibles.