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The formation method of flake graphite and its application in the semiconductor industry

wallpapers Industry 2021-03-24
According to the source of carbon, flake graphite can be of biological and non-biological origin.
1. Biogenesis of flake graphite
Biogenesis refers to the direct conversion of flake graphite from organic matter. It is commonly found in marble, schist or gneiss. Coal seams or carbon-bearing sedimentary rocks can partially form flake graphite through thermal metamorphism. A small amount of flake graphite is the primary mineral of igneous rocks and is widely distributed. , Is a metamorphic mineral deposit of graphite, which is formed by regional metamorphism of sedimentary rocks rich in organic matter or carbonaceous matter.
2. The non-biological origin of flake graphite
Abiotic origin refers to the reduction of carbon by CO and CO2. In the contact zone between magmatic rock and limestone, flake graphite is often produced. This is due to the decomposition of carbon dioxide from limestone and metamorphism. Any graphite The formation of deposits requires carbon concentration and suitable thermodynamic conditions. Almost all industrial flake graphite deposits are caused by metamorphism or endogenous effects, and the industrial value of flake graphite produced by metamorphism increases.
Application of flake graphite in semiconductor industry
Graphite powder has excellent properties and is widely used. The application in the semiconductor industry is one of them. The semiconductor industry has very high requirements for the graphite powder materials used, and the higher the purity, the better, especially the graphite devices that directly contact the semiconductor material, such as sintering molds, where high impurities can contaminate the semiconductor material.
Graphite materials used in the semiconductor industry require fine particle size. Fine-grained graphite not only easily achieves processing accuracy, but also has high high-temperature strength and low loss. In particular, molds used for sintering require high processing accuracy. Therefore, not only the purity of the graphite raw materials used must be strictly controlled, but also the high temperature graphitization treatment must be carried out to minimize the ash content.

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