Preparation method of artificial graphite film and graphite film material

A technology of artificial graphite and graphite film, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of no obvious improvement in thermal conductivity of graphite film, poor thermal conductivity of graphite film, and unsatisfactory thermal conductivity. , to achieve the effect of high crystallinity, high conductivity and high thermal conductivity

Pending Publication Date: 2019-08-06
宇冠芯龙(武汉)科技有限公司
View PDF5 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many ways to prepare artificial graphite film. For example, polyimide film is used as raw material, and polyimide film and graphite paper are cross-laminated and then carbonized and graphitized in a carbonization furnace, which enhances the bending resistance of graphite film. performance and reduce the brittleness of graphite film, but the thermal conductivity of graphite film has not been significantly improved; another example is to use a composite film obtained by compounding nano-diamond and polyimide as a raw material, and cross-laminate with graphite pape

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of artificial graphite film and graphite film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (1) The first staged temperature rise: use the PI film with a thickness of 38±5μm as the raw material, place it in a carbonization furnace with an internal pressure of -0.08MPa, and use the following staged temperature rise program to carry out the first staged temperature rise: The heating rate is 8°C / min from room temperature to 440°C, then the temperature is raised to 480°C at the rate of 0.5°C / min, and then the temperature is raised to 620°C at the rate of 0.5°C / min, and then the temperature is increased to 1.5°C / min Continue to raise the temperature to 690°C at a heating rate of 3°C / min, then continue to raise the temperature to 890°C at a heating rate of 3°C / min, and finally continue to raise the temperature to 1300°C at a heating rate of 3°C / min, keep the temperature for 60 minutes and then cool to obtain a carbonized film;

[0070] (2) The second staged temperature rise: place the carbonized film obtained in step (1) in a graphitization furnace filled with argon,...

Embodiment 2

[0072] (1) The first staged temperature rise: the PI film with a thickness of 38±5μm is used as a raw material, placed in a carbonization furnace with an internal pressure of -0.09MPa, and the first staged temperature rise is carried out using the following staged temperature rise program: The heating rate is 10°C / min from room temperature to 450°C, and then the heating rate is 1.5°C / min to 470°C, and the heating rate is 1°C / min to 610°C, and then the heating rate is 2°C / min. Continue to raise the temperature to 680°C at a heating rate of 3.5°C / min, then continue to raise the temperature to 900°C at a heating rate of 3.5°C / min, and finally continue to raise the temperature to 1100°C at a heating rate of 4°C / min, and cool down at a constant temperature for 80 minutes to obtain a carbonized film;

[0073] (2) The second staged temperature rise: place the carbonized film obtained in step (1) in a graphitization furnace filled with argon, and use the following staged temperature ri...

Embodiment 3

[0075] The steps are the same as in Example 2, except that the thickness of the PI film used in step (1) is 50±5 μm.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thermal conductivityaaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Thermal conductivityaaaaaaaaaa
Login to view more

Abstract

The invention discloses a preparation method of an artificial graphite film and a graphite film material. The method comprises: firstly subjecting a polyimide film to be fired according to a preset size to a first time of stepwise heating so that the polyimide film reacts, and cooling to obtain a semi-finished film; subjecting the semi-finished film to a second time of stepwise heating under inertgas protection so that the semi-finished film reacts, and cooling to obtain the graphite film. The polyimide film is adopted as a raw material. Two times of stepwise heating are performed, wherein aproper dynamic temperature filed is formed by utilizing the first time of stepwise heating to obtain a structure with high crystallinity, and on the basis of the first time of stepwise heating, the second time of stepwise heating is utilized and matches the first time of stepwise heating to form the graphite film with high orientation, high crystallinity and high conductivity, so that the preparedgraphite film has a higher thermal conductivity and improved thermal conduction performance.

Description

technical field [0001] The invention relates to the technical field of graphite film manufacture, in particular to a method for preparing an artificial graphite film and a graphite film material. Background technique [0002] With the continuous development of science and technology, various types of electronic terminals and auxiliary equipment, electronic components, such as electronic terminals such as notebook computers, tablet computers, smart phones, etc., and auxiliary equipment such as power banks. For electronic terminals, the functions of electronic terminals are becoming more and more powerful, the computing speed is getting faster and smaller, and the size is getting smaller and smaller, all of which lead to unavoidable heat dissipation problems; and the use of auxiliary equipment is becoming more and more frequent, and many household appliances The high integration and high density of electronic components in China will make the heat generation of electronic term...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01B32/205
CPCC01B32/205
Inventor 不公告发明人
Owner 宇冠芯龙(武汉)科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap