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Preparation method of high thermal conductive graphite material

A technology of high thermal conductivity graphite and paste is applied in the field of preparation of high thermal conductivity block graphite materials, which can solve the problems of low block density and thermal conductivity, long production cycle, and waste products, etc. simple craftsmanship

Active Publication Date: 2006-08-23
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has the disadvantages of long production cycle, low block density and thermal conductivity, and many microcracks in graphite products produced in actual production and utilization, often producing waste products and wasting raw materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Calcining mesophase pitch with a softening point of 237°C and a mesophase content of 70% at 900°C under an inert atmosphere for 3 hours; mechanically mixing the calcined pitch coke with the same mesophase pitch accounting for 25% of the total mass for 10 minutes, Afterwards, heat kneading on a hot kneader for 10 minutes to obtain a paste; after the paste is cooled, it is re-crushed through an 80-mesh sieve, and then hot-pressed at 2600 ° C and 25 MPa pressure to obtain high thermal conductivity pure graphite products after cooling. The prepared samples were cut into 10mm×10mm×20mm samples, polished, ultrasonically cleaned and dried, and the thermal conductivity was tested according to the relative comparison method of GB-3399-82(88), and the chamber vertical to the forming and pressing direction was measured. The warm thermal conductivity is 243w / mk.

Embodiment 2

[0022] Calcining mesophase pitch with a softening point of 253°C and a mesophase content of 80% at 1300°C for 3 hours in an inert atmosphere; mechanically mixing the calcined pitch coke with the same mesophase pitch accounting for 40% of the total mass for 15 minutes, Afterwards, heat kneading on a hot kneader for 15 minutes to obtain a paste; after the paste is cooled, it is re-crushed through an 80-mesh sieve, and then hot-pressed at 2600 ° C and 35 MPa pressure to obtain high thermal conductivity pure graphite products after cooling. The test was the same as in Example 1, and the thermal conductivity at room temperature perpendicular to the forming and pressing direction was measured to be 260w / mk.

Embodiment 3

[0024] The mesophase pitch with a softening point of 280°C and a mesophase content of 100% was calcined at 1300°C for 2 hours in an inert atmosphere; the softening point of the calcined pitch coke and 30% of the total mass was 330°C, and the mesophase content was 100% mesophase pitch was mechanically mixed for 15 minutes, then prepared and tested as in Example 2. A high thermal conductivity pure graphite product with a room temperature thermal conductivity of 282w / mk perpendicular to the forming and pressing direction was obtained.

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PUM

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Abstract

A graphite material with high thermal conductivity is prepared through calcining asphalt in argon atmosphere to obtain asphalt coke, mixnig it with asphalt adhesive, hot kneading (10-15 min), cooling, breaking, high-temp die pressing and cooling.

Description

technical field [0001] The invention belongs to a preparation method of a high thermal conductivity bulk graphite material. technical background [0002] With the development of science and technology, high power density devices tend to be miniaturized, lightweight, compact in structure, and efficient in operation. Higher requirements are put forward for performance, strength and stability. [0003] Traditional thermal conductive materials are mainly metals and their oxides and alloys. The disadvantages of metal materials are that they are not resistant to corrosion, have high density, and the material is slightly impure, and the thermal conductivity is greatly reduced; alloy materials are not only high in density, but also expensive. [0004] Graphite materials have high strength, good electrical conductivity, thermal shock resistance and thermal stability and are widely used in chemical industry, aerospace, metallurgy, nuclear energy and other fields. The thermal conduc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/04
Inventor 刘朗高晓晴郭全贵史景利
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI