CN113816742A - Preparation method of high-thermal-conductivity block - Google Patents

Preparation method of high-thermal-conductivity block Download PDF

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Publication number
CN113816742A
CN113816742A CN202111136945.2A CN202111136945A CN113816742A CN 113816742 A CN113816742 A CN 113816742A CN 202111136945 A CN202111136945 A CN 202111136945A CN 113816742 A CN113816742 A CN 113816742A
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Prior art keywords
block
thermal conductivity
thickness
graphite
dried
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CN202111136945.2A
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Chinese (zh)
Inventor
林剑锋
冯伟明
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Jiangsu Baoen New Material Technology Co ltd
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Jiangsu Baoen New Material Technology Co ltd
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Priority to CN202111136945.2A priority Critical patent/CN113816742A/en
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/515—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics
    • C04B35/52—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxide ceramics based on carbon, e.g. graphite
    • C04B35/522—Graphite
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
    • C04B2235/608—Green bodies or pre-forms with well-defined density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • C04B2235/9607—Thermal properties, e.g. thermal expansion coefficient

Abstract

The preparation method of the high-thermal-conductivity block comprises the steps of S1, crushing artificial graphite to obtain a material A, and crushing expanded graphite to obtain a material B; s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A; s3, pressing the mixed material A and material B into a block, wherein a large number of micro-pore structures are formed on the surface of the block and penetrate through the whole thickness direction; s4, coating or impregnating graphite oxide or graphene oxide on the block; specifically, one side is coated and dried, and then the other side is coated and dried; s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃; s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2-2g/cm3The high thermal conductivity block. The high-thermal-conductivity block prepared by the method can greatly improve the longitudinal thermal conductivity, the longitudinal thermal conductivity is more than 50w/m.k, and the use requirement of high-thickness occasions is met.

Description

Preparation method of high-thermal-conductivity block
Technical Field
The invention relates to the field of graphene, in particular to a preparation method of a high-thermal-conductivity block.
Background
The heat conducting performance of the conventional heat conducting block in the plane direction and the vertical direction has obvious anisotropy, the plane direction can reach more than 1000w/m.k, but the longitudinal heat conducting performance is lower than 5w/m.k, so that the heat radiating requirement of some special occasions cannot be met, and particularly when a product with thicker thickness is required in an application scene to solve the heat radiating problem.
Disclosure of Invention
The invention aims to provide a preparation method of a high-thermal-conductivity block, which mainly solves the problems of insufficient thermal conductivity coefficient, insufficient heat flux and the like of the existing graphite/graphene soaking film material.
The invention realizes the purpose through the following technical scheme: a preparation method of a high thermal conductivity block comprises the following steps:
s1, crushing artificial graphite to obtain a material A, and crushing expanded graphite to obtain a material B;
s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A;
s3, pressing the mixed material A and material B into a block, wherein a large number of micro-pore structures are formed on the surface of the block and penetrate through the whole thickness direction;
s4, coating or impregnating graphite oxide or graphene oxide on the block;
specifically, one side is coated, then dried at the temperature of 60-80 ℃, and the other side is coated and dried at the temperature of 40-80 ℃;
s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;
s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2-2g/cm3The high thermal conductivity block.
Preferably, the material A has the length of 1mm-1000mm, the width of 1um-100um and the thickness of 1um-100 um.
Preferably, the ratio of the material B to the material A is 3:1 to 7: 1.
Preferably, the block in S3 has a thickness of 1mm-10cm and a density of 0.1-1g/cm3。
Preferably, the thickness of the graphite oxide or the graphene oxide is 100um-10 mm.
Compared with the prior art, the preparation method of the high-thermal-conductivity block has the beneficial effects that: the prepared high-heat-conductivity block can greatly improve the longitudinal heat-conductivity and meet the use requirements of high-thickness occasions.
Detailed Description
Example 1
A preparation method of a high thermal conductivity block comprises the following steps:
s1, crushing artificial graphite to obtain a material A, wherein the thermal conductivity of the material A is more than 1000w/m.k, the length of the material A is 1mmmm, the width of the material A is 1um, and the thickness of the material A is 1 um; crushing expanded graphite to obtain a material B;
s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A, and the ratio of the material B to the material A is 3: 1;
s3, pressing the mixed material A and material B into blocks to form blocks with the thickness of 1mm and the density of 0.1g/cm3The surface of the block body forms a large number of micro-pore structures which penetrate through the whole thickness direction;
s4, coating or impregnating graphite oxide or graphene oxide on the block, wherein the thickness of the graphite oxide or graphene oxide is 100 um;
specifically, one side is coated, then dried at the temperature of 60 ℃, and then the other side is coated and dried at the temperature of 40 ℃;
s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;
s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2g/cm3The high thermal conductivity block.
Example 2
A preparation method of a high thermal conductivity block comprises the following steps:
s1, crushing artificial graphite to obtain a material A, wherein the thermal conductivity of the material A is more than 1000w/m.k, the length of the material A is 1000mm, the width of the material A is 100um, and the thickness of the material A is 100 um; crushing expanded graphite to obtain a material B;
s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A, and the ratio of the material B to the material A is 7: 1;
s3, pressing the mixed material A and material B into blocks to form blocks with the thickness of 10cm and the density of 1g/cm3The surface of the block body forms a large number of micro-pore structures which penetrate through the whole thickness direction;
s4, coating or impregnating graphite oxide or graphene oxide on the block, wherein the thickness of the graphite oxide or graphene oxide is 10 mm;
specifically, one side is coated, then dried at the temperature of 80 ℃, and then the other side is coated and dried at the temperature of 80 ℃;
s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;
s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 2g/cm3The high thermal conductivity block.
Example 3
A preparation method of a high thermal conductivity block comprises the following steps:
s1, crushing artificial graphite to obtain a material A, wherein the thermal conductivity of the material A is more than 1000w/m.k, the length of the material A is 500mm, the width of the material A is 1-100 um, and the thickness of the material A is 50 um; crushing expanded graphite to obtain a material B;
s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A, and the ratio of the material B to the material A is 5: 1;
s3, pressing the mixed material A and material B into blocks to form blocks with the thickness of 5cm and the density of 0.5g/cm3The surface of the block body forms a large number of micro-pore structures which penetrate through the whole thickness direction;
s4, coating or impregnating graphite oxide or graphene oxide on the block, wherein the thickness of the graphite oxide or graphene oxide is 5 mm;
specifically, one side is coated, then dried at the temperature of 70 ℃, and then the other side is coated and dried at the temperature of 60 ℃;
s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;
s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.6g/cm3The high thermal conductivity block.
The high-thermal-conductivity block prepared by the method can greatly improve the longitudinal thermal conductivity, the longitudinal thermal conductivity is more than 50w/m.k, and the use requirement of high-thickness occasions is met.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (5)

1. A preparation method of a high-thermal-conductivity block is characterized by comprising the following steps:
s1, crushing artificial graphite to obtain a material A, and crushing expanded graphite to obtain a material B;
s2, mixing the material A and the material B in proportion, wherein the material B is more than the material A;
s3, pressing the mixed material A and material B into a block, wherein a large number of micro-pore structures are formed on the surface of the block and penetrate through the whole thickness direction;
s4, coating or impregnating graphite oxide or graphene oxide on the block;
specifically, one side is coated, then dried at the temperature of 60-80 ℃, and the other side is coated and dried at the temperature of 40-80 ℃;
s5, performing heat treatment, gradually raising the temperature to 300 ℃ at first, then to 1000 ℃, and then to 3000 ℃;
s6, flat pressing, pressure of 0-1000 tons and pressure increasing speed of 1 ton/min to obtain density of 1.2-2g/cm3The high thermal conductivity block.
2. The method for preparing a high thermal conductivity block according to claim 1, wherein: the length of the material A is 1mm-1000mm, the width is 1um-100um, and the thickness is 1um-100 um.
3. The method for preparing a high thermal conductivity block according to claim 1, wherein: the ratio of the material B to the material A is 3:1 to 7: 1.
4. The method for preparing a high thermal conductivity block according to claim 1, wherein: the thickness of the block in the S3 is 1mm-10cm, and the density is 0.1-1g/cm3。
5. The method for preparing a high thermal conductivity block according to claim 1, wherein: the thickness of the graphite oxide or the graphene oxide is 100um-10 mm.
CN202111136945.2A 2021-09-27 2021-09-27 Preparation method of high-thermal-conductivity block Pending CN113816742A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050098037A (en) * 2004-04-06 2005-10-11 주식회사 상진미크론 Thermally improve conductive carbon sheet based on mixed carbon materials of expanded graphite powder and carbon nano tube powder and method for making the same
CN101134675A (en) * 2007-08-07 2008-03-05 哈尔滨工程大学 Preparation method of graphite radical composite material
US20080193767A1 (en) * 2005-07-27 2008-08-14 Exaenc Corp. Thermally Improve Conductive Carbon Sheet Base on Mixed Carbon Material of Expanded Graphite Powder and Carbon Nano Tube Powder
CN102887665A (en) * 2012-08-16 2013-01-23 中科恒达石墨股份有限公司 Novel graphite powder and radiator made of novel graphite powder
US20140127488A1 (en) * 2012-11-02 2014-05-08 Aruna Zhamu Graphene oxide-coated graphitic foil and processes for producing same
CN105016731A (en) * 2015-07-09 2015-11-04 天津大学 Expanded graphite and graphene composite material and preparation method therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050098037A (en) * 2004-04-06 2005-10-11 주식회사 상진미크론 Thermally improve conductive carbon sheet based on mixed carbon materials of expanded graphite powder and carbon nano tube powder and method for making the same
US20080193767A1 (en) * 2005-07-27 2008-08-14 Exaenc Corp. Thermally Improve Conductive Carbon Sheet Base on Mixed Carbon Material of Expanded Graphite Powder and Carbon Nano Tube Powder
CN101134675A (en) * 2007-08-07 2008-03-05 哈尔滨工程大学 Preparation method of graphite radical composite material
CN102887665A (en) * 2012-08-16 2013-01-23 中科恒达石墨股份有限公司 Novel graphite powder and radiator made of novel graphite powder
US20140127488A1 (en) * 2012-11-02 2014-05-08 Aruna Zhamu Graphene oxide-coated graphitic foil and processes for producing same
CN105016731A (en) * 2015-07-09 2015-11-04 天津大学 Expanded graphite and graphene composite material and preparation method therefor

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Application publication date: 20211221