The coverage of special graphite is very wide. The elec […]
The coverage of special graphite is very wide. The electric carbon product industry, natural graphite product industry and metallurgical carbon product industry have different understanding and classification methods. For the customary classification of metallurgical carbon product industry, special graphite mainly refers to high strength , High density, high purity graphite products (referred to as three high graphite). Three high graphite can be divided into three types of coarse particle structure, fine particle structure and extra fine particle structure in terms of material structure. The main difference between molding methods is compression molding special graphite, extrusion molding special graphite and isostatic molding special graphite. Three types, in addition, vibration molding can also be used to produce special graphite. High-quality special graphite-Isotropic graphite is special graphite produced by isostatic pressing process.
Not all special graphites must meet the same high-density, high-strength, and high-purity indexes. Special graphites used in different occasions have specific strength and density requirements, that is, the strength and density indexes are different. Many special graphites do not need to achieve high purity, and ash is not the main quality indicator. Some special graphites do not need high strength and high density but need high purity. Some special graphites, such as graphite for EDM, require fine-grain structure graphite or ultra-fine-grain structure graphite with different physical and chemical indexes according to different processing techniques and processing objects.
Classified by main purpose:
1. Special graphite for EDM.
2. Make special graphite for casting mold.
3. Special graphite for continuous casting of steel, copper or aluminum.
4. High-purity graphite for Czochralski single-crystal silicon furnace or for smelting precious metals and high-purity materials.
5. Graphite for synthetic artificial diamond.
6. Special graphite for rocket and missile technology.
The broad special graphite also includes pyrolytic carbon (pyrolytic graphite), carbon materials for bioengineering, "glass carbon, porous carbon and porous graphite, interlayer compounds of carbon (such as flexible graphite, fluorinated graphite), graphite for laser, etc. The machinery and electronics industry also uses many special carbon and graphite materials, such as carbon brushes, carbon graphite bearings, feed sliders for electric locomotives, graphite molds for drawing optical fibers, etc.