Graphite furnace lining used for high purity graphitization furnaces, and preparation method thereof

Abstract

The invention discloses a graphite furnace lining used for high purity graphitization furnaces, and a preparation method thereof, and belongs to the technical field of graphite processing. The preparation method comprises steps of crushing, sieving, material preparing, dry blending, wet blending, moulding, primary roasting, primary dipping, secondary roasting, secondary dipping, tertiary roasting, and graphitization. In the raw materials of the graphite furnace lining, an aggregate is composed of calcined coke, pitch coke, and needle coke at a mass ratio of 80-82:10-15:5-8; wherein calcined coke is composed of particles with four following different particle size ranges: 0.5mm<=particle size<0.8mm, 0.335mm<=particle size <0.5mm, 0.075mm<=particle size<0.335mm, and particle size<0.075mm, and the weight amounts of the four particles account for 1 to 2%, 35 to 40%, 27 to 31%, and 27 to 37% respectively. Purity of the graphite furnace lining prepared via the preparation method is high; bulk density is large; porosity is low; ash content is low; oxidation resistance, compressive strength, and rupture strength are extremely excellent; and application requirements on high purity graphitization furnace linings are satisfied.

Description

technical field [0001] The invention relates to a graphite material and a preparation method thereof, in particular to a graphite lining for a high-purity graphitization furnace and a preparation method thereof. Background technique [0002] High-purity graphite refers to graphite with a carbon content greater than 99.99%. High-purity graphite has the advantages of high temperature resistance, corrosion resistance, thermal shock resistance, small thermal expansion coefficient, self-lubricating, small resistivity and easy machining. It is widely used in metallurgy, machinery, environmental protection, chemical industry, electronics, medicine, military industry and aerospace fields, and its position in the national economy is becoming more and more important. [0003] At present, my country's graphite industry technology is still at the low level in the world, and the products are mostly raw materials and primary processed products, and the high impurities in the products limi...

AI Technical Summary

Problems solved by technology

The temperature of the graphite furnace lining is as high as 3000-3300°C, so the lining material must be resistant to high temperature, oxidation resistance, low ash content and thermal shock resistance. In addition, the purity of the graphite material for the furnace lining has a direct impact on the performance of the graphitized product. If the graphite furnace lining If the impurity content is too high, impurities will be introduced into the graphitization product, thereby affecting the performance of the high-purity graphite product. Conventional graphite materials cannot meet the lining requirements of high-purity graphitization furnaces

At this stage, the lining of high-purity graphitization furnaces is mostly made of carbon-carbon composite materials, which have low purity, low strength, and are expensive. In addition, the lining is still a wearing part, which greatly increases the production cost.

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