The Relationship Between The Bulk Density Of Graphite Products And Their Properties
Dec 06, 2022
One of the main uses of graphite is the production of refractory materials, including refractory bricks, crucibles, continuous casting powder, mold cores, molds, cleaning agents and high temperature resistant materials. Because graphite products have many excellent properties, they are widely used in metallurgy, machinery, electrical, chemical, textile and other industrial sectors. When graphite products are used as structural materials and impermeable materials, the products must have a relatively high bulk density. The bulk density of graphite products has a direct impact on its electrical conductivity, thermal conductivity, mechanical strength, and oxidation resistance. In addition, the bulk density also changes the permeability, smoothness and wear resistance of the product. Increasing the bulk density is not conducive to improving the thermal contraction coefficient and reducing the mold. Therefore, graphite products used under thermal shock conditions cannot one-sidedly pursue high bulk density.
Let's understand the relationship between the bulk density of graphite products and their properties? See the following points for details: the relationship between bulk density and specific resistance ----- graphite products reduce the effective cross-section of electric conduction due to the existence of voids, so the resistance of graphite products is related to its bulk density. The relationship between bulk density and mechanical strength -------- the dependence of mechanical strength and bulk density of graphite products. The strength of graphite products depends strongly on the bulk density of the product. The relationship between bulk density, thermal conductivity and thermal shock resistance factor-------The thermal conductivity of graphite is between that of aluminum and mild steel. Generally, the lower the specific resistance, the higher the thermal conductivity of the material, and the material with a heat treatment temperature above 2600 degrees. The relationship between bulk density and specific resistance illustrates the effect of bulk density on thermal conductivity.
Graphite electrodes and graphite products as structural materials, the impact of their thermal shock resistance on use has been recognized by people, and the thermal conductivity, tensile strength, Young's modulus, thermal contraction coefficient and other indicators that determine the thermal shock resistance factor . Both are closely related to the bulk density of the product. and increases with increasing bulk density. Therefore, the problem of "suitable body density" is raised. The selection of "suitable body density" should be based on the product use conditions. For products produced from different raw materials and different processes, their "suitable bulk density" will be different.
