CN114793411A - Composite heat conduction structure with flame retardance and heat conduction performance - Google Patents
Composite heat conduction structure with flame retardance and heat conduction performance Download PDFInfo
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- CN114793411A CN114793411A CN202210460344.5A CN202210460344A CN114793411A CN 114793411 A CN114793411 A CN 114793411A CN 202210460344 A CN202210460344 A CN 202210460344A CN 114793411 A CN114793411 A CN 114793411A
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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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Abstract
The invention discloses a composite heat conduction structure with flame retardance and heat conduction performance, which comprises a heat conduction plate arranged between a chip and heat dissipation fins, wherein the heat conduction plate consists of a plurality of closely connected heat dissipation monomers, and the cross sections of the heat dissipation monomers are hexagonal; the heat dissipation monomer comprises a winding core, a filler and a surface covering material; the winding core is a curled graphene coiled material, a filler is filled in an inner gap of the graphene coiled material, the filler is powdery graphite, carbon black or graphene slurry, and the filler is formed at high temperature and high pressure and filled in the gap of the graphene coiled material; the surface covering material is a high polymer material with certain flame retardant ability, is located at the periphery of the graphene coiled material and is formed into a hexagon. The structure fully utilizes the characteristics that the graphene material has strong unidirectional heat conduction capability but weak interlayer heat conduction capability, and fully exerts the unidirectional heat conduction capability of the graphene through a curled structure.
Description
Technical Field
The invention relates to a composite heat conduction structure with flame retardant and heat conducting properties.
Background
In the view of traditional technicians, the flame retardance and the heat dissipation performance are similar, namely, the material with better flame retardance usually has poor heat conduction performance, and the flame retardance of the non-metal heat conduction material except the metal material is reduced.
However, in continuous material verification and modification experiments, it was found that Melamine Phosphate (MP) has good heat stability and heat absorption properties, and releases NH when pyrolyzed 3 Absorbs heat and generates polyphosphoric acid, so that a uniform and compact carbon layer is formed on the surface of the substrate to play the roles of heat insulation, oxygen insulation and smoke generation inhibition.
With the technical inspiration, research and development personnel further research and discover that when MP is compounded with the graphene-like material, particularly when MP is hybridized with SiO2, hydrophobicity and flame retardant efficiency can be improved, so that the flame retardant capability of the material is further improved.
Graphene and graphite-like materials have very excellent heat conductivity and relatively low density, and the materials have good value in the fields of chip heat conduction and micro motor heat dissipation.
Furthermore, the multilayer graphene has a better space heat conduction structure, the heat dissipation capability is better than that of single-layer graphene, and due to the limitation of a processing technology, the multilayer graphene can better cooperate with heat conduction fillers such as micro-powder graphite which are not completely stripped.
Aiming at the prior art, effective fillers are added into the multilayer graphene to form an effective heat dissipation network with the fillers, and the surface of the MP material is subjected to flame retardant treatment, so that the future development trend of the future flame-retardant heat-conducting graphene is realized.
Disclosure of Invention
In order to solve the defects of the prior art, a composite heat conduction structure with flame retardant and heat conduction performances is provided.
A composite heat conducting structure with flame retardant and heat conducting properties comprises the following structures:
the heat conducting plate is arranged between the chip and the radiating fins and consists of a plurality of radiating single bodies which are tightly connected, and the cross sections of the radiating single bodies are hexagonal;
the heat dissipation monomer comprises a winding core, a filler and a surface covering material;
the winding core is a coiled graphene coiled material, one end of the graphene coiled material is in contact with the chip to be cooled, and the other end of the graphene coiled material is in contact with the cooling fins;
filling filler which is powdery graphite, carbon black or graphene slurry into the inner gaps of the graphene coiled materials, and filling the filler into the gaps of the graphene coiled materials after high-temperature and high-pressure molding;
the surface covering material is a high polymer material with certain flame retardant ability, is located at the periphery of the graphene coiled material and is formed into a hexagon.
Further, the surface covering material is an MP material.
Furthermore, the graphene coiled material is formed by single-layer graphene through hot roll forming.
In order to ensure that the gap between the filler and the winding core is minimized, the filler is filled and cured through the following steps:
s1, performing electrostatic electret treatment on the surface of the graphene coiled material to enable the surface to have electrostatic adsorption capacity;
s2, curling and shaping the graphene coiled material;
s3, injecting powder under a vacuum environment;
s4, in the powder filling process, blocking the opening at one end, and performing pressurized injection at the other end through an electrostatic spray gun;
and S5, after the punching is finished, the outer surface of the periphery is pressurized by a special clamping jaw, and the powder is melted and solidified under the condition of high temperature and high pressure.
Further, the graphene coiled material is single-layer graphene or multi-layer graphene.
6. The composite heat conducting structure with flame retardant and heat conducting functions as claimed in claim 1, wherein the heat dissipating units are connected by hot pressing.
Furthermore, heat-conducting silicone grease is coated between the heat-conducting plate and the chip and between the heat-conducting plate and the radiating fins.
Has the advantages that:
the structure fully utilizes the characteristics that the graphene material has strong unidirectional heat conduction capability but weak interlayer heat conduction capability, and fully exerts the unidirectional heat conduction capability of the graphene through a curled structure.
Simultaneously, this application designs the heat dissipation monomer of a plurality of accurate connections to be connected through hexagonal form, the contact material of junction is for the macromolecular material that has certain flame retardant ability, and the fire retardant ability of promotion graphite alkene heat conduction structure that graphene materials can show through outer covering flame retardant material's form, thereby makes this structure can effectual fire-retardant and heat conduction.
Drawings
FIG. 1 is a common structure for heat dissipation of a chip;
FIG. 2 is a schematic view of the mechanism of the upper end of the heat-conducting plate;
FIG. 3 is a schematic diagram of a heat dissipating unit;
fig. 4 is a thermal conductivity of bulk graphene material;
1. the heat-conducting plate comprises a chip 2, a heat-conducting plate 3, heat-radiating fins 21, a graphene coiled material 22 and a filler.
Detailed Description
For the purpose of enhancing understanding of the present invention, the present invention will be further described in detail with reference to the following examples and the accompanying drawings, which are provided for illustration only and are not intended to limit the scope of the present invention.
The implementation example is as follows:
a composite heat conducting structure with flame retardant and heat conducting properties comprises the following structures:
the heat-conducting plate 2 is arranged between the chip 1 and the radiating fins 3, the heat-conducting plate 2 is composed of a plurality of radiating single bodies which are tightly connected, and the cross sections of the radiating single bodies are hexagonal;
the heat dissipation monomer comprises a winding core 21, a filler 22 and a surface covering material;
the winding core 21 is a curled graphene coiled material, one end of the graphene coiled material is in contact with a chip to be cooled, and the other end of the graphene coiled material is in contact with the cooling fins;
filling filler is filled in the inner gaps of the graphene coiled material, the filler is powdery graphite, carbon black or graphene slurry, and the filler is formed at high temperature and high pressure and filled in the gaps of the graphene coiled material;
the surface covering material is a high polymer material with certain flame retardant ability, is located at the periphery of the graphene coiled material and is formed into a hexagon.
Further, the surface covering material is an MP material.
Furthermore, the graphene coiled material is formed by single-layer graphene through hot roll forming.
The filler is filled and cured through the following steps:
s1, performing electrostatic electret treatment on the surface of the graphene coiled material to enable the surface to have electrostatic adsorption capacity;
s2, curling and shaping the graphene coiled material;
s3, injecting powder under a vacuum environment;
s4, in the powder filling process, blocking the opening at one end, and performing pressurized injection at the other end through an electrostatic spray gun;
and S5, after the punching is finished, the outer surface of the periphery is pressurized by a special clamping jaw, and the powder is melted and solidified under the condition of high temperature and high pressure.
As shown in the figure, the heat dissipation fins 3 absorb heat from the chip 1 through the heat conduction plate 2 and dissipate the heat, wherein the heat conduction plate 2 is used for effectively conducting the heat away.
In the actual use process, the graphene coiled material is of a one-way heat conduction structure, the unfolded area of the graphene coiled material is far larger than the surface area which can be realized by the structure, and the heat conduction efficiency of the graphene coiled material is far higher than that of a blocky graphene material due to the fact that interlayer heat conduction does not exist. As shown in fig. 4, the bulk graphene material has interlayer heat conduction, and the heat transfer capability of the bulk graphene material is inferior to that of a single-layer graphene material, but the total amount of heat transfer per unit time is greater than that of a certain sheet graphene material.
As a further improvement, the above-mentioned is only a preferred embodiment of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A composite heat conducting structure with flame retardant and heat conducting properties is characterized by comprising
The heat-conducting plate is arranged between the chip and the radiating fins and consists of a plurality of radiating single bodies which are tightly connected, and the cross sections of the radiating single bodies are hexagonal;
the heat dissipation monomer comprises a roll core, a filler and a surface covering material;
the winding core is a coiled graphene coiled material, one end of the graphene coiled material is in contact with a chip to be cooled, and the other end of the graphene coiled material is in contact with the cooling fins;
filling filler which is powdery graphite, carbon black or graphene slurry into the inner gaps of the graphene coiled materials, and filling the filler into the gaps of the graphene coiled materials after high-temperature and high-pressure molding;
the surface covering material is a high polymer material with certain flame retardant capability, is located on the periphery of the graphene coiled material and is formed into a hexagon.
2. The composite heat conducting structure as claimed in claim 1, wherein the surface covering material is MP material.
3. The composite heat conducting structure with flame retardant and heat conducting properties as claimed in claim 1, wherein the graphene coiled material is formed by single-layered graphene through hot roll forming.
4. The composite heat conducting structure with flame retardant and heat conducting properties as claimed in claim 1, wherein the filler is filled and cured by the following steps:
s1, performing electrostatic electret treatment on the surface of the graphene coiled material to enable the surface to have electrostatic adsorption capacity;
s2, curling and shaping the graphene coiled material;
s3, injecting powder in a vacuum environment;
s4, in the powder filling process, blocking the opening at one end, and performing pressurized injection at the other end through an electrostatic spray gun;
and S5, after the punching is finished, the outer surface of the periphery is pressurized by a special clamping jaw, and the powder is melted and solidified under the condition of high temperature and high pressure.
5. The composite heat conducting structure with flame retardant and heat conducting properties of claim 1, wherein the graphene coiled material is single-layer graphene or multi-layer graphene.
6. The composite heat conducting structure with flame retardant and heat conducting functions as claimed in claim 1, wherein the heat dissipating units are connected by hot pressing.
7. The composite heat conducting structure of claim 1, wherein the heat conducting plate and the chip, and the heat conducting plate and the heat dissipating fins are coated with heat conducting silicone grease.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210460344.5A CN114793411A (en) | 2022-04-28 | 2022-04-28 | Composite heat conduction structure with flame retardance and heat conduction performance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210460344.5A CN114793411A (en) | 2022-04-28 | 2022-04-28 | Composite heat conduction structure with flame retardance and heat conduction performance |
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| Publication Number | Publication Date |
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| CN114793411A true CN114793411A (en) | 2022-07-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210460344.5A Pending CN114793411A (en) | 2022-04-28 | 2022-04-28 | Composite heat conduction structure with flame retardance and heat conduction performance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115991943A (en) * | 2023-03-02 | 2023-04-21 | 湖南人文科技学院 | Preparation method of graphene heat-conducting corrosion-resistant integrated water-based paint |
-
2022
- 2022-04-28 CN CN202210460344.5A patent/CN114793411A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115991943A (en) * | 2023-03-02 | 2023-04-21 | 湖南人文科技学院 | Preparation method of graphene heat-conducting corrosion-resistant integrated water-based paint |
| CN115991943B (en) * | 2023-03-02 | 2023-08-22 | 湖南人文科技学院 | Preparation method of graphene heat-conducting corrosion-resistant integrated water-based paint |
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