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Determination method of large-size high-heat conduction graphite membrane

A technology of high thermal conductivity graphite and determination method, applied in the field of determination of large-size high thermal conductivity graphite film, can solve the problems of not reaching complete clarity, limitation and the like

Inactive Publication Date: 2015-09-16
ZHENJIANG BROWAH TECH
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Problems solved by technology

Although many researchers have done a lot of work in this area, due to the limitations of research methods and test conditions, it has not yet reached a completely clear point.

Method used

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Embodiment Construction

[0010] A method for measuring large-scale high-thermal-conductivity graphite film, which cuts 80 layers of PI film with a diameter of 40mm and puts it into a carbonization furnace for carbonization, and then pressurizes it mechanically at 200kg / cm 2 , the transformation process of the microstructure of the sample taken during the heat treatment process,

[0011] 1. Stage I temperature 2 , N 2 , so that the relative content of carbon in the system increased rapidly to over 83%, while the atomic ratio of N / C and O / C decreased sharply, and the conductivity was also significantly improved; first, the imide ring was broken along the C~N bond, A benzene ring compound with a conjugated cyano group and an isocyano group is formed; the isocyano compound is further dimerized into diphenylcarbodiimide, which is then polymerized to form a nitrogen-containing heterocyclic polycyclic aromatic hydrocarbon; further pyrolysis and carbonization will It leads to the merging of aromatic heterocy...

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Abstract

The invention discloses a determination method of a large-size high-heat conduction graphite membrane. The method comprises carrying out cutting to obtain a PI membrane with the diameter of 40mm, overlapping the 80 PI membranes, putting them into a carbonization furnace, carrying out carbonization, carrying out mechanical pressurization at pressure intensity of 200kg / cm<2>, taking a sample and carrying out heat treatment, wherein in the heat treatment, a microstructure conversion process is divided into four phases, the first phase temperature is less than 800 DEG C, a second phase temperature is in a range of 800-2000 DEG C, a third phase temperature is in a range of 2000-2500 DEG C and a forth phase temperature is greater than 2500 DEG C. The PI membrane-to-graphite conversion process is divided into the four phases. In the whole reaction process, the product has original membrane molecular orientation and high plane orientation. The sample has a graphitization degree of 74.4% and thermal conductivity of 850W / (m.K) to 1000W / (m.K).

Description

technical field [0001] The invention relates to a method for measuring a large-size high-thermal conductivity graphite film, which is especially suitable for circuit boards and chips of various electronic products. Background technique [0002] Highly oriented graphite has excellent electrical and thermal conductivity, and is an indispensable ideal material for the development of modern science and technology. In 1992, Japanese scholar M. Murakami 11 At first, the method of lamination heat treatment was tried to produce high thermal conductivity graphite block. The Shanxi Coal Chemical Institute of the Chinese Academy of Sciences has developed a high thermal conductivity graphite bulk material with a thermal conductivity greater than 600W / (m·K) by using PI film lamination and hot pressing technology. The pyrolysis reaction mechanism in the process of carbonization and graphitization of organic polymers is very complicated. For raw materials that are easy to graphitize, c...

Claims

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Application Information

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IPC IPC(8): C01B31/04
Inventor 杨云胜杨星郭颢蒋伟良
Owner ZHENJIANG BROWAH TECH
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