CN112822917A - Preparation method of carbon heat conducting sheet - Google Patents
Preparation method of carbon heat conducting sheet Download PDFInfo
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- CN112822917A CN112822917A CN202110005622.3A CN202110005622A CN112822917A CN 112822917 A CN112822917 A CN 112822917A CN 202110005622 A CN202110005622 A CN 202110005622A CN 112822917 A CN112822917 A CN 112822917A
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- heat conducting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/367—Cooling facilitated by shape of device
- H01L23/3672—Foil-like cooling fins or heat sinks
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/34—Arrangements for cooling, heating, ventilating or temperature compensation ; Temperature sensing arrangements
- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
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- Thermal Sciences (AREA)
- Carbon And Carbon Compounds (AREA)
Abstract
The invention discloses a preparation method of a carbon heat conducting fin, which comprises the steps of pouring carbon heat conducting fin raw materials into a barrel-shaped container, fixing the barrel-shaped container added with the raw materials in a clamping groove seat of high-speed rotating equipment, realizing rotation and/or revolution of the barrel-shaped container through the high-speed rotating equipment to carry out rotary sample preparation, carrying out vacuum defoaming on a sample to obtain a heat conducting fin crude sample, and cutting and coating the heat conducting fin crude sample to obtain the carbon heat conducting fin; in addition, the temperature of the barrel-shaped container added with the carbon heat conducting sheet raw material is controlled to be increased to 80-150 ℃ while the sample is prepared by rotation. The invention aims to reduce the complexity of the carbon heat conducting strip in the manufacturing process by using an innovative method, reduce the equipment and personnel cost and further improve the production efficiency of the carbon fiber heat conducting strip; the production mode of low carbon greatly reduces the production cost, widens the application market of the carbon heat conducting sheet and provides the possibility of cost for the popularization of 5G communication equipment.
Description
Technical Field
The invention relates to the technical field of heat-conducting interface materials and preparation, in particular to a preparation method of a carbon heat-conducting fin.
Background
At present, a large number of novel high-heating electronic elements such as 5G base stations and high-performance mobile phone chips face the problem of heat dissipation which is important, and if the heat dissipation is carried out by using traditional heat conduction materials, the electronic elements are likely to be overheated and lose practicability. However, the heat conducting sheet is an excellent heat conducting gap filling material, and the value of the heat conducting sheet is irreplaceable. The carbon fiber oriented arrangement type heat conducting fin is taken as a heat conducting fin with extremely high heat conductivity coefficient, greatly exceeds the heat dissipation limit of the traditional heat conducting fin, and can rapidly lead heat out of a heating electronic component so as to control the temperature of the electronic component within a reasonable range.
In the prior art, chinese patent document CN108781524A discloses a method for preparing carbon fiber heat conducting sheets, which uses a magnetic field orientation method to produce carbon fiber heat conducting sheets with single orientation. Chinese patent documents CN103748146A and CN110229367A disclose a method for producing a carbon fiber heat conductive sheet, in which carbon fibers are oriented by an extrusion molding method to produce an anisotropic carbon fiber heat conductive sheet. Chinese patent document CN107396610A discloses a method for preparing a carbon fiber heat conducting sheet, which uses an electrostatic flocking method to prepare an ultra-thin carbon fiber heat conducting sheet. The carbon fiber heat conducting fins prepared by the method have respective defects, such as complex production equipment and process, expensive production equipment, underground yield and other adverse factors, and limit the industrial development of products.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a preparation method of a carbon heat conducting sheet to solve the problems in the technical background.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a preparation method of a carbon heat conducting fin comprises the steps of pouring raw materials of the carbon heat conducting fin into a barrel-shaped container, fixing the barrel-shaped container filled with the raw materials in a clamping groove seat of high-speed rotating equipment, carrying out rotating sample preparation in one or two modes of rotation and revolution of the barrel-shaped container through the high-speed rotating equipment, carrying out vacuum defoaming on a sample to obtain a coarse sample of the heat conducting fin, and cutting and coating the coarse sample of the heat conducting fin to obtain the carbon heat conducting fin; wherein the revolution speed is 500-; in addition, the temperature of the barrel-shaped container added with the carbon heat conducting sheet raw material is controlled to be increased to 80-150 ℃ while the sample is prepared by rotation.
In the above technical solution, the high-speed rotating apparatus is a non-intrusive material homogenizer.
According to the technical scheme, the heating device is arranged in the cavity of the high-speed rotating equipment and used for controlling the barrel-shaped container added with the carbon heat conducting strip raw material to be heated to 80-150 ℃, the heating device is an electric heating film attached to the inner wall of the cavity of the high-speed rotating equipment, the temperature sensor is further arranged inside the inner wall of the cavity of the high-speed rotating equipment and used for adjusting the internal temperature in a feedback mode, the electric heating film is matched with the temperature controller for use, and the temperature controller adjusts the electric heating film to heat according to the temperature fed back by the.
Among the above-mentioned technical scheme, barrel-shaped container shape is one in cask, square barrel, the arbitrary symmetrical shape bucket in the hexagon bucket, and the container volume is 0.1~ 500L.
In the technical scheme, the coarse sample of the heat conducting strip is cut into the sample in a cutting mode of the circular knife, the ultrasonic knife and the planer knife, so that the cut sample is obtained.
Among the above-mentioned technical scheme, the shape of the thick sample of conducting strip is the cylinder, and the specific cutting mode of cylinder is: firstly, equally dividing a cylinder into a plurality of sub-blocks along the radial direction, wherein the radial section of each sub-block is a fan shape, and the central angle alpha of the fan shape is selected to be 0-90 degrees; and then selecting a single sub-block for slicing, wherein the cutting surface is parallel to an AOB plane, the AOB plane is the side surface of the sub-block, is vertical to the bottom surface of the cylinder and passes through the axial lead of the cylinder, and the thickness of the AOB plane reaches 0.3-2 mm.
In the technical scheme, the central angle alpha is 0-45 degrees.
According to the technical scheme, the cutting sample is placed on a release film, and the sample is further placed on a coating machine for coating, wherein the coating thickness is 10-500 micrometers.
In the above technical solution, the carbon heat conducting sheet comprises the following raw materials by weight: one or more of aluminum oxide, aluminum nitride, silicon dioxide, silver powder, glass powder, aluminum hydroxide and magnesium hydroxide, the content is 2000 portions;
one or more of acrylic resin, epoxy resin, polyurethane and organic silicon oil, the content of which is 100-1000 parts;
the content of the organic fiber-based carbon fiber is 100-1000 parts.
In the above technical scheme, the organic fiber-based carbon fiber comprises one or more of a polyacrylonitrile group, a viscose group, an asphalt group, and a lignin fiber group.
Compared with the prior art, the invention has the beneficial effects that:
the invention aims to reduce the complexity of the carbon heat conducting strip in the manufacturing process by using an innovative method, reduce the equipment and personnel cost and further improve the production efficiency of the carbon heat conducting strip. The production mode of low carbon greatly reduces the production cost, widens the application market of the carbon heat conducting sheet and provides the possibility of cost for the popularization of 5G communication equipment.
Drawings
FIG. 1 is a schematic view of the fixed mounting of a barrel container according to the present invention;
FIG. 2 is a schematic view showing the position of a barrel container and a chamber of a high-speed rotating apparatus;
FIG. 3 is a schematic diagram of a rough sample cut of a thermally conductive sheet;
in the figure, 1, a barrel-shaped container; 2. a slot clamping seat; 100. a cavity of the high-speed rotating equipment; α represents a central angle of the sector-shaped cross section; the AOB plane is a plane which is perpendicular to the bottom surface of the cylinder and passes through the axis of the cylinder and is the side surface of each subblock.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
The invention provides a preparation method of a carbon heat conducting fin, which comprises the steps of pouring carbon heat conducting fin raw materials into a barrel-shaped container 1, fixing the barrel-shaped container filled with the raw materials in a clamping groove seat 2 of high-speed rotating equipment (shown in figure 1), carrying out rotating sample preparation in one or two modes of rotation and revolution of the barrel-shaped container through the high-speed rotating equipment, carrying out vacuum defoaming on a sample to obtain a coarse heat conducting fin sample, and cutting and coating the coarse heat conducting fin sample to obtain the carbon heat conducting fin; wherein the revolution speed is 500-; in addition, the temperature of the barrel-shaped container added with the carbon heat conducting sheet raw material is controlled to be increased to 80-150 ℃ while the sample is prepared by rotation.
In the invention, the high-speed rotating equipment is a non-intrusive material homogenizer. As one embodiment of heating the barrel-shaped container to 80-150 ℃, a heating device (not shown in the figure) is arranged on the inner wall of the cavity 100 of the high-speed rotating equipment, and is used for controlling the heating of the barrel-shaped container added with the carbon heat-conducting sheet raw material to 80-150 ℃ (shown in figure 2); the heating device is an electric heating film (not shown in the figure) attached to the inner wall of the cavity of the high-speed rotating equipment, a temperature sensor (not shown in the figure) is further arranged inside the inner wall 100 of the cavity of the high-speed rotating equipment and used for adjusting the internal temperature in a feedback mode, the electric heating film is matched with a temperature controller to be used, and the temperature controller adjusts the electric heating film to heat according to the temperature fed back by the temperature sensor.
In the invention, the barrel-shaped container is one of barrels with any symmetrical shape in a barrel, a square barrel and a hexagonal barrel, and the volume of the container is 0.1-500L.
According to the invention, the rough sample of the heat conducting strip is cut by a circular knife, an ultrasonic knife and a planer knife to obtain a cut sample. Further, as shown in fig. 3, the shape of the coarse sample of the heat conducting sheet is a cylinder, and the specific cutting mode of the cylinder is as follows: firstly, equally dividing a cylinder into a plurality of sub-blocks along the radial direction, wherein the radial section of each sub-block is in a fan shape, and the central angle alpha is selected to be 0-90 degrees, more preferably 0-45 degrees and even more preferably 0-15 degrees; and then selecting a single sub-block for slicing, wherein the cutting surface is parallel to an AOB plane (shown in figure 3) and is cut into carbon heat conducting sheets with different sizes (different lengths and widths and same thickness), the AOB plane is the side surface of the sub-block, is vertical to the bottom surface of the cylinder and passes through the axial lead of the cylinder, and the thickness reaches 0.3-2 mm.
In the invention, a cutting sample is placed on a release film, and the sample is further placed on a coating machine for coating, wherein the coating thickness is 10-500 micrometers.
In the invention, the carbon heat conducting sheet comprises the following raw materials in parts by weight: one or more of aluminum oxide, aluminum nitride, silicon dioxide, silver powder, glass powder, aluminum hydroxide and magnesium hydroxide, the content is 2000 portions;
one or more of acrylic resin, epoxy resin, polyurethane and organic silicon oil, the content of which is 100-1000 parts;
the content of the organic fiber-based carbon fiber is 100-1000 parts. Wherein the organic fiber-based carbon fiber comprises one or more of polyacrylonitrile base, viscose base, asphalt base and lignin fiber base.
Firstly, the carbon heat conducting sheet prepared from the raw material components and the mixture ratio in the embodiments 1 to 7 is prepared by the preparation method of the carbon heat conducting sheet provided by the invention, the carbon heat conducting sheet prepared from the raw material components and the mixture ratio in the embodiment 8 is prepared by a common production process, and the performance of the carbon heat conducting sheet is tested, and the specific table is shown in table 1:
TABLE 1
As can be seen from table 1, examples 1 to 7 demonstrate that the carbon heat conductive sheet has good thermal conductivity, hardness, and the like; example 8 shows that the carbon heat conductive sheet obtained by the process of this example has better properties than example 1.
Secondly, the preparation method of the carbon heat conducting sheet provided by the invention and the existing process are adopted to prepare the influence of the raw material components and the proportion of the carbon heat conducting sheet in the embodiment 1 on the product yield, the yield is mainly evaluated through appearance, the determination method is visual, and specifically, if the cut sheet has hole-shaped defects or dents, the cut sheet is regarded as bad; see table 2 for details:
TABLE 2
| Group of | Example 1 | Practice ofExample 9 | Example 10 | Example 11 |
| Production process | The invention | CN108781524A | CN110229367A | CN107396610A |
| Yield of | 99.7％ | 90.5％ | 81.2％ | 90.1％ |
As can be seen from table 2, the yield of the carbon heat conducting sheet produced by the process of the present invention is 99.7%, which indicates that the present invention improves the yield of the product, and further improves the production efficiency of the carbon fiber heat conducting sheet.
The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.
Claims (10)
1. A preparation method of a carbon heat conducting fin is characterized in that raw materials of the carbon heat conducting fin are poured into a barrel-shaped container (1), the barrel-shaped container (1) filled with the raw materials is fixed in a clamping groove seat (2) of high-speed rotating equipment, one or two modes of rotation and revolution of the barrel-shaped container are realized through the high-speed rotating equipment to carry out rotating sample preparation, a sample is subjected to vacuum defoaming to obtain a crude sample of the heat conducting fin, and the crude sample of the heat conducting fin is cut and coated to obtain the carbon heat conducting fin; wherein the revolution speed is 500-; in addition, the temperature of the barrel-shaped container added with the carbon heat conducting sheet raw material is controlled to be increased to 80-150 ℃ while the sample is prepared by rotation.
2. The method as claimed in claim 1, wherein the high speed rotation device is a non-intrusive material homogenizer.
3. The method for preparing a carbon heat-conducting sheet according to claim 2, wherein the barrel-shaped container containing the carbon heat-conducting sheet is heated to 80 to 150 ℃ by a heating device disposed in the chamber of the high-speed rotating device, and the heating device is an electrothermal film attached to the inner wall of the chamber of the high-speed rotating device.
4. The method for preparing a carbon heat-conducting fin according to claim 1, wherein the barrel-shaped container is one of a barrel, a square barrel and a hexagonal barrel which are symmetrical in shape, and the volume of the container is 0.1-500L.
5. The method as claimed in claim 1, wherein the rough sample of the thermally conductive sheet is cut by a circular knife, an ultrasonic knife, or a planer knife to obtain a cut sample.
6. The method for preparing a carbon heat-conducting sheet according to claim 5, wherein the rough sample of the heat-conducting sheet is in the shape of a cylinder, and the cylinder is cut in a specific manner: firstly, a cylinder is divided into a plurality of sub-blocks along the radial direction, the radial section of each sub-block is fan-shaped, and the central angle alpha of each fan-shaped is selected from 0-90 degrees; and then selecting a single sub-block for slicing, wherein the cutting surface is parallel to an AOB plane, the AOB plane is the side surface of the sub-block, is vertical to the bottom surface of the cylinder and passes through the axial lead of the cylinder, and the thickness of the AOB plane reaches 0.3-2 mm.
7. The preparation method of the carbon heat conducting sheet according to claim 6, wherein the central angle α is 0-45 ℃.
8. The method for preparing a carbon heat-conducting sheet according to claim 5, wherein the cut sample is placed on a release film, and further the sample is placed on a coating machine for coating, wherein the coating thickness is 10 to 500 μm.
9. The method of claim 1, wherein the carbon heat conductive sheet comprises the following raw materials by weight: one or more of aluminum oxide, aluminum nitride, silicon dioxide, silver powder, glass powder, aluminum hydroxide and magnesium hydroxide, the content is 2000 portions;
one or more of acrylic resin, epoxy resin, polyurethane and organic silicon oil, the content of which is 100-1000 parts;
the content of the organic fiber-based carbon fiber is 100-1000 parts.
10. The method for preparing a carbon heat conducting sheet according to claim 9, wherein the organic fiber-based carbon fiber comprises one or more of polyacrylonitrile-based, viscose-based, pitch-based, and lignin-fiber-based.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005622.3A CN112822917A (en) | 2021-01-05 | 2021-01-05 | Preparation method of carbon heat conducting sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110005622.3A CN112822917A (en) | 2021-01-05 | 2021-01-05 | Preparation method of carbon heat conducting sheet |
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| CN112822917A true CN112822917A (en) | 2021-05-18 |
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| CN202110005622.3A Withdrawn CN112822917A (en) | 2021-01-05 | 2021-01-05 | Preparation method of carbon heat conducting sheet |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115448745A (en) * | 2022-09-21 | 2022-12-09 | 亚太中碳(山西)新材料科技有限公司 | Preparation method of oriented heat-conducting and electric-conducting graphite carbon film and oriented heat-conducting carbon piece |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108568926A (en) * | 2017-11-21 | 2018-09-25 | 中国科学院金属研究所 | A method of efficiently preparing highly directional, high-densit two-dimensional material film |
| CN110734562A (en) * | 2019-11-22 | 2020-01-31 | 江苏鸿凌达科技有限公司 | graphene fiber oriented heat conducting sheet and preparation method thereof |
-
2021
- 2021-01-05 CN CN202110005622.3A patent/CN112822917A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108568926A (en) * | 2017-11-21 | 2018-09-25 | 中国科学院金属研究所 | A method of efficiently preparing highly directional, high-densit two-dimensional material film |
| CN110734562A (en) * | 2019-11-22 | 2020-01-31 | 江苏鸿凌达科技有限公司 | graphene fiber oriented heat conducting sheet and preparation method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115448745A (en) * | 2022-09-21 | 2022-12-09 | 亚太中碳(山西)新材料科技有限公司 | Preparation method of oriented heat-conducting and electric-conducting graphite carbon film and oriented heat-conducting carbon piece |
| CN115448745B (en) * | 2022-09-21 | 2023-04-25 | 亚太中碳(山西)新材料科技有限公司 | Preparation method of directional heat-conducting and electric-conducting graphite carbon film and directional heat-conducting carbon piece |
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Application publication date: 20210518 |