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Porosity of graphite electrode

Release time:2019-11-04 From: Zhengnai Industry in China

Density definition

Density (bulk density) refers to the mass of a substance per unit volume of a raw material pellet or a finished sample.

Density of graphite electrode

Weighing method

The measurement density is mainly measured by weighing. The raw material or the semi-finished product of the graphite electrode and the finished product are cut into a cube or a cylinder of a certain size, dried in an oven at 105-110 ° C for 5 hours, taken out and cooled to room temperature, and the size is accurately measured and the volume is calculated. Weigh on the balance.

Index of HP Graphite Electrode

Item  Unit HP
300~500 550~700
Electric  Resistivity  Electrode uΩ.m 5.5~6.8 5.5~7.0
Bending  Strength Electrode Nipple MPa ≥10.0 ≥8.5
Modulus  of Elasticity Electrode Nipple GPa ≤13.0
Bulk Density Electrode Nipple g/cm3 1.62~1.70
Ash Content Electrode Nipple % ≤0.3
The Coefficient of Thermal Expansion (CTE) Electrode Nipple 10-6/℃ 1.80~2.20

Graphitization process is related to density

The density of petroleum coke is increased after calcination, but it is generally reduced after graphitization, with the exception of some bituminous coke, which is related to the increase of true density and volume change of coke during graphitization.

Density affects mechanics and thermal properties

Density is an important quality indicator for carbon and graphite products. The density affects the mechanical and thermal properties of raw materials or finished products to some extent.

Factors affecting density

The density of the graphite electrode is related to the type of raw material used, and has a great relationship with the particle size composition of the compound and the amount of the binder, and is also related to the process parameters such as kneading quality, molding pressure, calcination or graphitization temperature.