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A kind of preparation method of low resistivity isotropic graphite

An isotropic and graphite technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of long roasting time, only 75% pass rate, high energy consumption, etc., and achieve fast heating speed and heat transfer And the effect of uniform heating and reducing labor intensity

Active Publication Date: 2017-04-12
HUNAN CHANGYU NEW CARBON MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long roasting time, the energy consumption is high, but the qualified rate is still only about 75%

Method used

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  • A kind of preparation method of low resistivity isotropic graphite
  • A kind of preparation method of low resistivity isotropic graphite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The preparation process of the low-resistivity isotropic graphite green body of the present invention comprises the following steps:

[0044] ① material preparation

[0045] Requirements for raw materials used in the present invention: high-purity graphite powder requires a carbon content of 99.9%, an ash content of less than 300ppm, and a D50 of 15-25μm. The volatile matter of petroleum coke is less than 0.5%, the moisture is less than 0.5%, the ash content is less than 0.5%, and the resistivity is less than 500µΩ•m. Pitch coke sulfur content is less than 0.5%, volatile matter is less than 0.5%, water content is less than 0.5%, ash content is less than 0.5%, resistivity is less than 550µΩ•m. Modified asphalt requires a high-temperature softening point temperature of 100~115°C, a volatile content of less than 45%, a moisture content of less than 1%, an ash content of less than 0.3%, and a content of quinoline insolubles of less than 8%. It is commercially available and...

Embodiment 2

[0064] Carry out the preparation of the low-resistivity isotropic graphite green body and the serial electric roasting according to the steps of Example 1, the difference is: step 2. get the ground raw material powder respectively according to the following mass percentage: 32% high-purity graphite powder, 20% petroleum coke, 30% pitch coke, 16% modified pitch, 2% surfactant; step ③ mix the carbon powder and heat to 150°C while vacuuming.

[0065] After testing the performance parameters of graphite green body: density 1.54g / cm 3 , the resistivity is 1000µΩ•m, and the isotropic coefficient is less than 1.05.

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Abstract

The invention relates to a preparation method of low-resistivity isotropic graphite. The low-resistivity isotropic graphite is prepared from the following raw materials: 20-35% of high-purity graphite powder, 20-35% of petroleum coke, 20-40% of tar coke, 15-25% of modified pitch and 1-5% of surfactant; the preparation method comprises the following steps: performing primary grinding on each raw material; mixing the high-purity graphite powder, the petroleum coke and the tar coke together, heating to the range of 150-180 DEG C, and meanwhile, vacuumizing, next, adding the modified pitch and the surfactant and stirring while heating and pressurizing, and keeping the temperature within the range of 180-200 DEG C; rolling the evenly mixed raw material into a sheet; performing secondary grinding and then stirring evenly; and performing isostatic compaction on the evenly mixed raw material by use of a multi-hole mold, thereby obtaining an isotropic graphite green body, and finally roasting. The preparation method of the low-resistivity isotropic graphite is used for solving the technical problems of high resistivity and poor homogeneity of the graphite green body and capable of obtaining the low-resistivity graphite green body good in homogeneity; and the resistivity of the obtained graphite green body is 1 time lower than the traditional resistivity.

Description

technical field [0001] The invention relates to a graphite processing technology, in particular to a preparation method of isotropic graphite. Background technique [0002] Large-scale isotropic graphite materials have good electrical conductivity, thermal shock resistance, corrosion resistance and high temperature resistance, high strength, high hardness, self-lubrication, radiation protection, high melting point, high stability, etc., and have been widely used in aviation Aerospace, national defense and military industry, nuclear reactors, semiconductors, electronics, metallurgy and other high-tech fields have become the most important strategic emerging materials in the 21st century. Since isotropic graphite is a strategic material, foreign countries have imposed a technical blockade on my country for a long time, resulting in the monopoly of large-scale isotropic graphite production by foreign companies. my country's application enterprises all rely on imports, the cost...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/205
Inventor 刘金平刘洪波杨程于新春
Owner HUNAN CHANGYU NEW CARBON MATERIALS
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