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What is the needle coke of the graphite electrode?

Sep 20, 2019
Needle coke is an appearance with a distinct fibrous texture, a particularly low coefficient of thermal expansion and easy to graphitize
A kind of high-quality coke, which can be split into slender strips according to texture when the coke is broken (the aspect ratio is generally above 1.75), and an anisotropic fibrous structure can be observed under a polarizing microscope. focal.
The anisotropy of physico-mechanical properties of needle coke is very obvious, parallel to the long axis direction of the particle
Good electrical and thermal conductivity, low coefficient of thermal expansion, the majority of the long axis of the particles are aligned in the extrusion direction during extrusion. Therefore, needle coke is the key raw material for manufacturing high-power or ultra-high-power graphite electrodes. The graphite electrode produced has low resistivity, small thermal expansion coefficient and good thermal shock resistance.
Needle coke is divided into oil needle needle coke produced from petroleum residue and refined coal bitumen raw material.
The coal produced is needle-like coke.