CN113122785A - High-thermal-conductivity long graphite fiber/Cu thermal conduction belt and preparation method thereof - Google Patents
High-thermal-conductivity long graphite fiber/Cu thermal conduction belt and preparation method thereof Download PDFInfo
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- CN113122785A CN113122785A CN201911410086.4A CN201911410086A CN113122785A CN 113122785 A CN113122785 A CN 113122785A CN 201911410086 A CN201911410086 A CN 201911410086A CN 113122785 A CN113122785 A CN 113122785A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
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- C22C47/06—Pretreatment of the fibres or filaments by forming the fibres or filaments into a preformed structure, e.g. using a temporary binder to form a mat-like element
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- C22C47/00—Making alloys containing metallic or non-metallic fibres or filaments
- C22C47/08—Making alloys containing metallic or non-metallic fibres or filaments by contacting the fibres or filaments with molten metal, e.g. by infiltrating the fibres or filaments placed in a mould
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/02—Alloys containing metallic or non-metallic fibres or filaments characterised by the matrix material
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
- C22C49/14—Alloys containing metallic or non-metallic fibres or filaments characterised by the fibres or filaments
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Abstract
The invention relates to a high-thermal-conductivity feldspar graphite fiber/Cu thermal conduction belt and a preparation method thereof, and belongs to the technical field of thermal management materials. The heat conduction belt is formed by compounding high-heat-conduction feldspar graphite fibers and copper alloy, the high-heat-conduction feldspar graphite fibers are woven into a prefabricated body, and the copper alloy is filled in the prefabricated body. Weaving high-heat-conductivity feldspar ink fibers into a prefabricated body; vacuum smelting of copper alloy; placing the braided feldspar ink fiber preform in molten copper alloy in a vacuum environment, and completely infiltrating; after complete infiltration, pulling the graphite fiber away from the metal liquid surface, and cooling to obtain the feldspar ink fiber/Cu composite material; and grinding and polishing the surface of the composite material belt to obtain the high-thermal-conductivity feldspar ink fiber/Cu thermal-conductive belt. The heat conducting strip prepared by the invention has high heat conductivity, low density and good flexibility, is suitable for the part with large heat dissipation capacity but narrow space of aerospace parts, and can quickly lead out heat.
Description
Technical Field
The invention relates to a high-thermal-conductivity feldspar graphite fiber/Cu thermal conduction belt and a preparation method thereof, and belongs to the technical field of thermal management materials.
Background
With the development of power devices, the demand of high-efficiency heat dissipation materials is more and more urgent, and the third generation of heat management materials mainly comprise diamond reinforced metal matrix composite materials, wherein the heat conductivity of the materials is higher than 550W/mK, and the density is lower than 5.0g/cm3The heat-dissipating material is ideal, but has problems of being difficult to process, having no flexibility, and being unusable as a heat-conductive tape. At present, the unit area power consumption of some aerospace devices is increased, the heat dissipation area is small, the heat productivity is large, the space is limited, heat inside the devices cannot be subjected to heat exchange in a convection heat exchange mode, therefore, the heat inside the devices needs to be led out, and the material needs to have high heat conductivity, light weight and flexibility as good as possible. The heat conductivity of the existing copper wire is up to 400W/mK, and the specific gravity is large, so that the existing copper wire does not meet the requirement of light weight of aerospace materials. Therefore, a novel flexible heat conduction belt with high heat conduction is urgently needed to replace a copper belt.
Disclosure of Invention
Aiming at the existing material problems, the invention provides the high-thermal-conductivity long graphite fiber/Cu thermal conduction strip which is suitable for heat dissipation of aerospace components.
The high-thermal-conductivity long graphite fiber/Cu thermal conduction belt is formed by compounding high-thermal-conductivity feldspar graphite fibers and a copper alloy, wherein the high-thermal-conductivity feldspar graphite fibers are woven into a prefabricated body, and the copper alloy is filled in the prefabricated body.
Wherein, the volume content of the high heat conduction long graphite fiber is 20-60%, and the volume content of the copper alloy is 40-80%. And filling the copper alloy in the prefabricated body woven by the feldspar ink fibers with high thermal conductivity by adopting an infiltration mode.
Wherein the diameter of the long graphite fiber with high thermal conductivity is 10-20 μm.
Wherein the thermal conductivity of the long graphite fiber with high thermal conductivity is 600-1000W/mK.
The prefabricated body woven by the high-thermal-conductivity feldspar ink fibers can be in a belt shape, a cloth shape, a three-dimensional shape and the like, and the weaving mode is not limited. The size of the preform may be determined as desired.
Wherein, the copper alloy can be Cu-Cr alloy, Cu-Ti alloy, Cu-B alloy and the like.
The preparation method of the high-thermal-conductivity long graphite fiber/Cu thermal conduction band adopts an infiltration process to compound the high-thermal-conductivity feldspar graphite fiber and the copper alloy, and comprises the following steps:
(1) weaving high-heat-conductivity feldspar ink fibers into a prefabricated body with a certain width and thickness;
(2) vacuum smelting of copper alloy;
(3) placing the braided feldspar ink fiber preform in molten copper alloy in a vacuum environment, and completely infiltrating;
(4) after complete infiltration, pulling the graphite fiber away from the metal liquid surface, and cooling to obtain the feldspar ink fiber/Cu composite material;
(5) and (3) grinding and polishing the surface of the composite material belt to obtain the high-thermal-conductivity feldspar ink fiber/Cu thermal-conductive belt.
In the step 3), the temperature of the molten copper alloy is 1100-1300 ℃, and the time for complete infiltration can be selected from 10-50 min.
The heat conduction feldspar ink fiber has the beneficial effects that the high heat conduction feldspar ink fiber in the heat conduction belt plays a role in heat transmission, and meanwhile, the copper alloy can increase the flexibility of the heat conduction belt, so that the heat conduction performance is improved, the weight of the heat conduction belt is reduced, the heat conduction rate is higher than that of copper, and the weight is reduced by more than one third.
The high-heat-conductivity feldspar ink fiber/Cu heat-conducting belt is formed by compounding high-heat-conductivity feldspar ink fiber and copper alloy. Firstly weaving long graphite fibers with a certain diameter to have a required thickness and width, then placing the long graphite fibers in molten copper alloy under a vacuum environment, pulling the long graphite fibers away from the metal liquid surface after complete infiltration, and grinding and polishing the surface after cooling to prepare the high-thermal-conductivity feldspar graphite fiber/Cu thermal conduction band. The heat conducting strip prepared by the invention has high heat conductivity, low density and good flexibility, is suitable for the part with large heat dissipation capacity but narrow space of aerospace parts, and can quickly lead out heat.
Drawings
Fig. 1 is a flow chart of a preparation method of a high-thermal-conductivity long graphite fiber/Cu thermal-conductive strip.
Fig. 2 is a schematic cross-sectional structure view of a long graphite fiber/Cu thermal conduction strip with high thermal conductivity prepared in example 1.
Description of the main reference numerals:
1 high thermal conductivity graphite fiber 2 copper alloy
Detailed Description
As shown in fig. 1, when preparing the high thermal conductivity long graphite fiber/Cu thermal conduction band, firstly, weaving the high thermal conductivity long graphite fiber into a preform with a desired width and thickness, and vacuum melting copper alloy; then, an infiltration process is adopted, the woven feldspar ink fiber preform is placed in molten copper alloy in a vacuum environment, the temperature of the molten copper alloy is 1100-1300 ℃, infiltration is complete, and the infiltration time is 10-50 min; then pulling the graphite fiber away from the metal liquid surface after the infiltration is completed, and cooling to obtain the feldspar ink fiber/Cu composite material; and finally, grinding and polishing the surface of the composite material belt to obtain the high-thermal-conductivity feldspar graphite fiber/Cu thermal-conductive belt.
As shown in fig. 2, the high thermal conductivity feldspar graphite fiber/Cu thermal conduction band of the present invention is formed by compounding a high thermal conductivity graphite fiber 1 and a copper alloy 2, and the copper alloy 2 is filled in pores in a preform woven by the high thermal conductivity graphite fiber 1 by an infiltration process. The volume content of the graphite fiber is 20-60%, and the volume content of the copper alloy 2 is 40-80%. The diameter of the high heat conduction graphite fiber 1 is 10-20 μm, and the heat conductivity of the high heat conduction graphite fiber 1 is 600-1000W/mK. The copper alloy 2 is Cu-Cr alloy, Cu-Ti alloy, Cu-B alloy, or the like.
Example 1:
weaving feldspar ink fibers with the diameter of 15 mu m and the thermal conductivity of 650W/mK into a preform (two-dimensional cloth) with the volume fraction of 20%, putting the preform into Cu-2 wt% B alloy melted at 1100 ℃, infiltrating for 15 minutes, pulling the graphite fiber preform away from the metal liquid level, and cooling to obtain the feldspar ink fiber/Cu composite material; the composite material is subjected to surface grinding and polishing to prepare the high-thermal-conductivity feldspar graphite fiber/Cu thermal conduction belt, the volume content of graphite fibers is 20%, the volume content of copper alloy is 80%, and the density of the thermal conduction belt is 7.5g/cm3The thermal conductivity in the lengthwise direction of the graphite fibers was 500W/mK.
Example 2:
weaving feldspar ink fibers with the diameter of 10 mu m and the thermal conductivity of 700W/mK into fiber cloth with the volume fraction of 30% and the thickness of 1mm, putting the fiber cloth into Cu-5 wt% Cr alloy melted at 1150 ℃, infiltrating for 10 minutes, pulling the graphite fiber preform away from the metal liquid level, and cooling to obtain the feldspar ink fiber/Cu composite material; the composite material is subjected to surface grinding and polishing to prepare the high-thermal-conductivity feldspar graphite fiber/Cu thermal conduction belt, the volume content of graphite fibers is 30%, the volume content of copper alloy is 70%, and the density of the thermal conduction belt is 6.8g/cm3The thermal conductivity of the graphite fibers in the length direction is 650W/mK.
Example 3:
the feldspar ink fiber with the diameter of 18 mu m and the thermal conductivity of 800W/mK is woven into a three-dimensional preform with the volume fraction of 50%, the diameter of 20mm and the thickness of 30mm, the three-dimensional preform is placed into Cu-1.5 wt% Ti alloy which is melted at 1300 ℃, infiltration is carried out for 50 minutes, and graphite fiber is prefabricated and preparedPulling the body away from the metal liquid surface, and cooling to obtain the feldspar ink fiber/Cu composite material; the composite material is subjected to surface grinding and polishing to prepare the high-thermal-conductivity feldspar graphite fiber/Cu thermal conduction belt, the volume content of graphite fibers is 50%, the volume content of copper alloy is 50%, and the density of the thermal conduction belt is 5.4g/cm3The thermal conductivity of the graphite fibers in the length direction was 700W/mK.
Example 4:
weaving feldspar ink fiber with the diameter of 20 mu m and the thermal conductivity of 700W/mK into a belt-shaped prefabricated body with the volume fraction of 40%, the width of 2mm and the length of 30mm, putting the belt-shaped prefabricated body into Cu-3 wt% Cr alloy which is melted at 1200 ℃, infiltrating for 20 minutes, pulling the graphite fiber prefabricated body away from the metal liquid surface, and cooling to obtain the feldspar ink fiber/Cu composite material; the composite material is subjected to surface grinding and polishing to prepare the high-thermal-conductivity feldspar graphite fiber/Cu thermal conduction belt, the volume content of graphite fibers is 40%, the volume content of copper alloy is 60%, and the density of the thermal conduction belt is 6.1g/cm3The thermal conductivity of the graphite fibers in the length direction is 600W/mK.
The heat conducting strip prepared in the embodiment of the invention has high heat conductivity, low density and good flexibility, is suitable for parts with large heat dissipation capacity but narrow space, and can rapidly lead out heat.
Claims (9)
1. A long graphite fiber/Cu heat conduction area of high heat conduction, its characterized in that: the high-heat-conductivity feldspar ink fiber composite material is formed by compounding high-heat-conductivity feldspar ink fiber and a copper alloy, the high-heat-conductivity feldspar ink fiber is woven into a prefabricated body, and the copper alloy is filled in the prefabricated body.
2. The long highly thermally conductive graphite fiber/Cu thermally conductive tape according to claim 1, wherein: the volume content of the high-thermal-conductivity long graphite fiber is 20-60%, and the volume content of the copper alloy is 40-80%.
3. The high thermal conductivity feldspar ink fiber/Cu thermal conductivity strip of claim 2, wherein: and filling the copper alloy in the prefabricated body woven by the feldspar ink fibers with high thermal conductivity by adopting an infiltration mode.
4. The long highly thermally conductive graphite fiber/Cu thermally conductive tape according to claim 3, wherein: the diameter of the long graphite fiber with high thermal conductivity is 10-20 μm.
5. The long highly thermally conductive graphite fiber/Cu thermally conductive tape according to claim 4, wherein: the thermal conductivity of the high-thermal-conductivity long graphite fiber is 600-1000W/mK.
6. The high thermal conductivity feldspar ink fiber/Cu thermal conductivity strip of claim 5, wherein: the prefabricated body woven by the high-heat-conductivity feldspar ink fibers is in a belt, cloth or three-dimensional shape.
7. The long highly thermally conductive graphite fiber/Cu thermally conductive tape according to claim 1, wherein: the copper alloy is Cu-Cr alloy, Cu-Ti alloy or Cu-B alloy.
8. The method for preparing the high thermal conductivity long graphite fiber/Cu thermal conduction band according to any one of claims 1 to 7, comprising the steps of:
(1) weaving high-heat-conductivity feldspar ink fibers into a prefabricated body;
(2) vacuum smelting of copper alloy;
(3) placing the braided feldspar ink fiber preform in molten copper alloy in a vacuum environment, and completely infiltrating;
(4) after complete infiltration, pulling the graphite fiber away from the metal liquid surface, and cooling to obtain the feldspar ink fiber/Cu composite material;
(5) and grinding and polishing the surface of the composite material belt to obtain the high-thermal-conductivity feldspar ink fiber/Cu thermal-conductive belt.
9. The preparation method of the high thermal conductivity feldspar ink fiber/Cu thermal conduction band according to claim 8, wherein the preparation method comprises the following steps: the temperature of the molten copper alloy is 1100-1300 ℃, and the infiltration time is 10-50 min.
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Citations (6)
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| US5042565A (en) * | 1990-01-30 | 1991-08-27 | Rockwell International Corporation | Fiber reinforced composite leading edge heat exchanger and method for producing same |
| US5410796A (en) * | 1993-10-06 | 1995-05-02 | Technical Research Associates, Inc. | Copper/copper alloy and graphite fiber composite and method |
| CN101323919A (en) * | 2008-07-25 | 2008-12-17 | 哈尔滨工业大学 | Method for preparing metal-matrix composite by vacuum pressure infiltration |
| CN102400006A (en) * | 2010-09-16 | 2012-04-04 | 北京有色金属研究总院 | Foamy carbon/copper matrix or aluminum matrix composite material and preparation method thereof |
| CN107043900A (en) * | 2017-02-22 | 2017-08-15 | 东莞市佳乾新材料科技有限公司 | A kind of preparation method of high-thermal-conductivity low-expansibility electronic package material |
| CN108179302A (en) * | 2018-01-30 | 2018-06-19 | 哈尔滨工业大学 | A kind of preparation method of high heat-conductive diamond/carbon/carbon-copper composite material |
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2019
- 2019-12-31 CN CN201911410086.4A patent/CN113122785A/en active Pending
Patent Citations (6)
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|---|---|---|---|---|
| US5042565A (en) * | 1990-01-30 | 1991-08-27 | Rockwell International Corporation | Fiber reinforced composite leading edge heat exchanger and method for producing same |
| US5410796A (en) * | 1993-10-06 | 1995-05-02 | Technical Research Associates, Inc. | Copper/copper alloy and graphite fiber composite and method |
| CN101323919A (en) * | 2008-07-25 | 2008-12-17 | 哈尔滨工业大学 | Method for preparing metal-matrix composite by vacuum pressure infiltration |
| CN102400006A (en) * | 2010-09-16 | 2012-04-04 | 北京有色金属研究总院 | Foamy carbon/copper matrix or aluminum matrix composite material and preparation method thereof |
| CN107043900A (en) * | 2017-02-22 | 2017-08-15 | 东莞市佳乾新材料科技有限公司 | A kind of preparation method of high-thermal-conductivity low-expansibility electronic package material |
| CN108179302A (en) * | 2018-01-30 | 2018-06-19 | 哈尔滨工业大学 | A kind of preparation method of high heat-conductive diamond/carbon/carbon-copper composite material |
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