CN112095032B - Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof - Google Patents

Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof Download PDF

Info

Publication number
CN112095032B
CN112095032B CN202010957406.4A CN202010957406A CN112095032B CN 112095032 B CN112095032 B CN 112095032B CN 202010957406 A CN202010957406 A CN 202010957406A CN 112095032 B CN112095032 B CN 112095032B
Authority
CN
China
Prior art keywords
graphite
magnesium
composite material
powder
thermal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202010957406.4A
Other languages
Chinese (zh)
Other versions
CN112095032A (en
Inventor
杜文博
祁振东
孟繁婧
杜宪
李淑波
刘轲
王朝辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Beijing University of Technology
Original Assignee
Beijing University of Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Beijing University of Technology filed Critical Beijing University of Technology
Priority to CN202010957406.4A priority Critical patent/CN112095032B/en
Publication of CN112095032A publication Critical patent/CN112095032A/en
Application granted granted Critical
Publication of CN112095032B publication Critical patent/CN112095032B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/05—Mixtures of metal powder with non-metallic powder
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0408—Light metal alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0084—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ carbon or graphite as the main non-metallic constituent

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)

Abstract

The invention discloses a graphite-reinforced high-thermal-conductivity magnesium-based composite material and a preparation method thereof, and relates to the field of heat conduction and preparation of magnesium-based composite materials, wherein the high-thermal-conductivity magnesium-based composite material comprises the following components in percentage by mass: the copper powder content is 4-25%, the graphite flake content is 4-25%, and the balance is magnesium powder. The high-thermal-conductivity graphite reinforced magnesium matrix composite material is realized by the following technical scheme: the components are fully mixed to prepare composite powder, and the composite material is obtained through briquetting and extrusion processes. The invention has simple process and short flow, and the composite material has the advantages of high heat conductivity and low density, can be applied to the application fields with higher requirements on heat conductivity, such as electronic packaging, special parts of 3C electronic products, signal communication parts and the like, and expands the application potential of the magnesium alloy.

Description

Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof
Technical Field
The invention relates to the field of heat conduction and preparation of magnesium-based composite materials, in particular to a graphite-reinforced high-heat-conductivity magnesium-based composite material and a preparation method thereof.
Background
In recent years, with the progress of industrial development, new demands are put forward in the fields of aerospace, automobiles, communication devices and the like, large-scale integrated circuits are widely applied in various fields, and small-sized, high-integration and high-power integrated circuits are the development direction of various electronic components. However, the high integration greatly reduces the heat dissipation space of the device, so that the power density of the device is increased rapidly, waste heat is gathered in a narrow space in the device, and the heat dissipation problems of overhigh local temperature, uneven heat flow distribution, overhigh heat flow density in a small space range and the like are increasingly highlighted, so that higher requirements are provided for the heat conductivity of the material.
The heat conductivity coefficient of pure magnesium is 158W/(m.K), the pure magnesium is only inferior to pure copper and pure aluminum in metal materials, and meanwhile, the metal magnesium also has the advantages of low density, high specific strength and specific stiffness, good damping performance, good electromagnetic shielding performance, easy recovery and the like. Because the mechanical property of pure magnesium is poor, the mechanical property of pure magnesium is improved by adopting an alloying method, but the addition of alloy elements inevitably causes the distortion of crystal lattices of a magnesium matrix, generates scattering to electrons and phonons which conduct heat, and reduces the mean free path of the electrons and the phonons, thereby reducing the thermal conductivity of the magnesium alloy. The high heat conduction reinforcing phase is added into the magnesium alloy matrix, so that the heat conduction performance of the magnesium alloy can be effectively improved, and the mechanical property of the magnesium alloy can be enhanced.
The natural crystalline flake graphite is an excellent heat conduction reinforcing phase along a two-dimensional direction, as a typical anisotropic material, the theoretical heat conductivity of the natural crystalline flake graphite on a (002) crystal plane (base plane) is more than 1000W/(m.K), the theoretical heat conductivity is two orders of magnitude higher than the heat conductivity perpendicular to the base plane, the graphite has good mechanical property, the tensile strength reaches 21GPa, the density is lower, and only 1/3 of steel exists; the elastic modulus can reach 1TPa to the maximum, is equivalent to that of graphene, and is low in cost which is only one thousandth of the price of graphene.
At present, most of graphite reinforced high-heat-conductivity metal-based materials are copper-based and aluminum-based materials. With the further increase of the requirement on light weight, the application of the high-thermal conductivity magnesium alloy and the composite material thereof is more and more concerned in the fields of aerospace, transportation, mobile communication and the like with higher requirements on density. The graphite reinforced magnesium-based composite material is one of effective ways for improving the heat conduction performance.
The scheme provided by the invention has the following significance: firstly, the high heat conduction characteristic of the graphite reinforcement is utilized to be compounded with the magnesium alloy matrix to improve the overall heat conduction performance; and secondly, the precipitation and distribution of a second phase in the alloy matrix are effectively controlled by using a special forming process, so that the heat-conducting property of the alloy is improved.
Disclosure of Invention
The invention mainly aims to solve the problem of low heat-conducting property of the traditional magnesium alloy at present, and develops a magnesium-based composite material with high heat-conducting property through a graphite reinforcing phase and a powder metallurgy forming process method. The method has the characteristics of simple process, short flow, easiness in industrial production, low cost and the like, and has wide application prospects in the fields of aerospace, electronic communication, electronic packaging and the like.
The invention provides a graphite-reinforced high-thermal-conductivity magnesium-based composite material which comprises the following raw materials in percentage by mass: the copper powder content is 4-25%, the graphite flake content is 4-25%, and the balance is magnesium powder.
The graphite reinforced high heat conductivity magnesium-based composite material has copper in the form of dispersed well-maintained particles, magnesium-copper alloy precipitated phase formed on the surface of the copper, and graphite in sheet structure.
The invention relates to a preparation method of a graphite-reinforced high-thermal-conductivity magnesium-based composite material, which is realized by the following technical scheme:
(1) and (3) diluting graphite with required mass with alcohol, and then carrying out ultrasonic treatment to obtain a graphite suspension. And stirring and mixing magnesium powder and copper powder with a certain particle size in alcohol according to a ratio, adding the graphite turbid liquid, continuously mixing, stirring and evaporating to remove the alcohol by distillation, and thus obtaining the mixed powder of the required composite material.
(2) Under a protective atmosphere, placing the mixed powder in a metal ingot pressing mold, heating to 280-350 ℃, and pressing into a block;
(3) and (3) under a protective atmosphere, placing the block obtained in the step (2) in a metal extrusion die, heating to 300-450 ℃, preserving heat for 15-30 min, and then extruding at an extrusion ratio of 8-20 to prepare the graphite reinforced magnesium matrix composite.
The magnesium powder is 200-400 mesh atomized magnesium powder, the copper powder is 200-400 mesh electrolytic copper powder, the purity of the copper powder is more than 99.5%, the graphite is 30-400 mesh graphite flake, and the purity of the graphite is more than 98%. The above-mentioned protective gas condition is SF6+N2The mixed gas of (3) in a ratio of 1: 10.
The graphite reinforced magnesium-based composite material prepared by the inventionThe thermal diffusivity of the alloy is 86.3-100.57 mm2The thermal conductivity can be 154-176.4W/(mK).
The graphite-reinforced high-thermal-conductivity magnesium-based composite material has the following advantages: the whole preparation process is simple in process, short in flow, small in environmental pollution, low in cost and easy for large-scale production and application, the heat-conducting property of the obtained alloy can reach 176.4W/(m.K), is improved by 18.7% compared with that of a matrix, and is expected to be applied to products such as electronic packaging, 3C special parts, electronic communication parts and the like with high requirements on the heat-conducting property.
Drawings
FIG. 1 is a composite compact of 5 wt.% GFs/Mg-15Cu and 10 wt.% GFs/Mg-15Cu after compaction in examples 1 and 2;
FIG. 2 is the 20 wt.% GFs/Mg-15Cu composite bar obtained after extrusion in example 3;
FIG. 3 is an optical microstructure diagram of a longitudinal section of a 20 wt.% GFs/Mg-15Cu composite bar obtained in example 3;
FIG. 4 is a comparison of the thermal diffusivity of the composite obtained in example 4 versus a matrix alloy;
figure 5 is a comparison of the thermal conductivity of the composite material obtained in example 4 and the matrix alloy.
Fig. 6-7 are cross-sectional views of Cu particles in example 3 to obtain 20 wt.% GFs/Mg-15 Cu.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be merely illustrative of specific embodiments of the present invention and not to limit the scope of the claims.
Example 1
Mixing 1.5g of graphite (50-mesh natural crystalline flake graphite) and alcohol at a mass ratio of 1:20, and performing ultrasonic treatment for 60min to obtain a graphite suspension. Stirring and mixing 24.0g of magnesium powder with 300 meshes and 4.5g of copper powder with 300 meshes in alcohol, adding a graphite suspension, mixing and evaporating to dryness to obtain 5 wt.% GFs/Mg-15Cu composite powder. The composite powder is put into a metal die to be preheated to 300 ℃, and then is pressed into blocks for molding. Polishing to remove oxide skin on the surface of the block, putting the block into an extrusion die, preheating to 350 ℃, and keeping the temperature for 15mAfter in, the blocks were extruded into rods at an extrusion ratio of 10, resulting in 5 wt.% GFs/Mg-15Cu composite. The thermal diffusivity of the material at room temperature is 86.2mm2And/s, the thermal conductivity is 154.0W/(mK).
Example 2
Mixing 3.0g of graphite (50-mesh natural crystalline flake graphite) and alcohol at a mass ratio of 1:20, and performing ultrasonic treatment for 60min to obtain a graphite suspension. Stirring and mixing 22.5g of magnesium powder with 300 meshes and 4.5g of copper powder with 300 meshes in alcohol, adding a graphite suspension, mixing and evaporating to dryness to obtain mixed powder of 10 wt.% GFs/Mg-15Cu composite material. The mixed powder is put into a metal die to be preheated to 300 ℃, and then is pressed into blocks for molding. Polishing to remove oxide skins on the surfaces of the blocks, putting the blocks into an extrusion die, preheating to 350 ℃, preserving heat for 15min, and extruding the blocks into rods with the extrusion ratio of 10 to obtain 10 wt.% GFs/Mg-15Cu composite material. The thermal diffusivity of the material at room temperature is 87.5mm2And/s, the thermal conductivity is 154.5W/(mK).
Example 3
Mixing 6.0g of graphite (50-mesh natural crystalline flake graphite) with alcohol at a mass ratio of 1:15, and performing ultrasonic treatment for 60min to obtain a graphite suspension. Stirring and mixing 19.5g of magnesium powder with 300 meshes and 4.5g of copper powder with 300 meshes in alcohol, adding a graphite suspension, mixing and evaporating to dryness to obtain mixed powder of 20 wt.% GFs/Mg-15Cu composite material. The mixed powder is put into a metal die to be preheated to 300 ℃, and then is pressed into blocks for molding. Polishing to remove oxide skins on the surfaces of the blocks, putting the blocks into an extrusion die, preheating to 350 ℃, preserving heat for 15min, and extruding the blocks into rods with the extrusion ratio of 10 to obtain the 20 wt.% GFs/Mg-15Cu composite material. The thermal diffusivity of the material at room temperature is 94.8mm2And the thermal conductivity is 165.4W/(m.K). Fig. 6-7 are cross-sectional views of Cu particles in 20 wt.% GFs/Mg-15Cu obtained in example 3, from which it can be seen that a magnesium-copper alloy phase is generated on the surface of the Cu particles.
Example 4
Mixing 6.0g of graphite (100-mesh natural crystalline flake graphite) with alcohol at a mass ratio of 1:15, and performing ultrasonic treatment for 60min to obtain a graphite suspension. Stirring and mixing 19.5g of magnesium powder with 300 meshes and 4.5g of copper powder with 300 meshes in alcohol, adding graphite suspension, mixing and evaporating to dryness to obtain the magnesium-copper alloy powder20 wt.% GFs/Mg-15Cu composite mixed powder. The mixed powder is put into a metal die to be preheated to 300 ℃, and then is pressed into blocks for molding. Polishing to remove oxide skins on the surfaces of the blocks, putting the blocks into an extrusion die, preheating to 350 ℃, preserving heat for 15min, and extruding the blocks into rods with the extrusion ratio of 10 to obtain the 20 wt.% GFs/Mg-15Cu composite material. The thermal diffusivity of the material at room temperature is 100.6mm2And the thermal conductivity is 176.4W/(mK).
Although preferred embodiments have been depicted and described in detail herein, it will be apparent to those skilled in the relevant art that various modifications, additions, substitutions and the like can be made without departing from the spirit of the invention and these are therefore considered to be within the scope of the invention as defined in the following claims.

Claims (4)

1. The graphite-reinforced high-thermal-conductivity magnesium-based composite material is characterized by comprising the following raw materials in percentage by mass: 4-25% of copper powder, 4-25% of graphite flake and the balance of magnesium powder;
wherein copper exists in the composite material in the form of dispersed well-maintained particles, a magnesium-copper alloy precipitated phase is formed on the surface of the copper, and graphite exists in the composite material in a sheet structure.
2. The method for preparing the graphite-reinforced high-thermal-conductivity magnesium-based composite material as claimed in claim 1 is characterized by comprising the following steps:
(1) diluting graphite with required mass with alcohol, and performing ultrasonic treatment to obtain a graphite suspension; stirring and mixing magnesium powder and copper powder with a certain particle size in alcohol according to a ratio, adding a graphite suspension, stirring and evaporating to dryness to remove the alcohol, and obtaining required mixed powder;
(2) under a protective atmosphere, placing the mixed powder in a metal ingot pressing mold, heating to 280-350 ℃, and then pressing into a block;
(3) and (3) under a protective atmosphere, placing the block obtained in the step (2) in a metal extrusion die, heating to 300-450 ℃, preserving heat for 15-30 min, and then extruding, wherein the extrusion ratio is 8-20, so as to prepare the graphite reinforced magnesium matrix composite.
3. The method according to claim 2, wherein the magnesium powder is 200-400 mesh atomized magnesium powder, the copper powder is 200-400 mesh electrolytic copper powder, the purity of the copper powder is more than 99.5%, the graphite is 30-400 mesh graphite flake, and the purity of the graphite is more than 98%.
4. The method as claimed in claim 3, wherein the prepared graphite reinforced Mg-based composite material has a thermal diffusivity of 86.3-100.57 mm2(ii) a thermal conductivity of 154 to 176.4W/(mK).
CN202010957406.4A 2020-09-13 2020-09-13 Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof Active CN112095032B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010957406.4A CN112095032B (en) 2020-09-13 2020-09-13 Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010957406.4A CN112095032B (en) 2020-09-13 2020-09-13 Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof

Publications (2)

Publication Number Publication Date
CN112095032A CN112095032A (en) 2020-12-18
CN112095032B true CN112095032B (en) 2022-01-14

Family

ID=73751449

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010957406.4A Active CN112095032B (en) 2020-09-13 2020-09-13 Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof

Country Status (1)

Country Link
CN (1) CN112095032B (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100484663C (en) * 2005-03-31 2009-05-06 上海交通大学 Method for preparing copper-plated graphite particle reinforced magnesium-base composite material
JP2008075127A (en) * 2006-09-21 2008-04-03 Chiba Inst Of Technology Method of producing magnesium alloy
CN105624446B (en) * 2016-03-22 2017-08-25 北京工业大学 Graphene enhancing magnesium, aluminum matrix composite and preparation method thereof

Also Published As

Publication number Publication date
CN112095032A (en) 2020-12-18

Similar Documents

Publication Publication Date Title
CN110106411B (en) Method for preparing high-content carbon nanotube reinforced magnesium-based composite material by adopting precursor
WO2020135582A1 (en) Aerogel-reinforced metal matrix composite material, preparation method and application thereof
CN100560762C (en) Nanometer and submicron aluminum oxide mixing enhancement copper-base composite material and preparation method
CN104988438A (en) High-strength and high-conductivity carbon nano tube strengthening copper-based composite material and preparing method thereof
CN110724860B (en) High-thermal-conductivity particle reinforced aluminum-based composite material and preparation method thereof
CN111485129B (en) TiC/Ti5Si3 reinforced copper-based composite material and preparation method thereof
CN103602843A (en) Carbon-nanotube-reinforced aluminum-base composite material
CN104878238A (en) Method for preparing nano-particle dispersed ultrafine grain metal matrix nano composite
JP5464301B2 (en) Method for manufacturing composite material for heat dissipation substrate
CN107043903A (en) Orientation texture Ti2AlC Mg based composites and its hot extrusion preparation method
CN112725660A (en) Powder metallurgy preparation method of graphene reinforced aluminum-based composite material
CN110983088A (en) High-thermal-conductivity aluminum-based graphene composite material and preparation method thereof
Zhang et al. Understanding the influencing mechanism of CNTs on the microstructure and mechanical properties of semi-solid stir casting Al-Cu-Mg alloys
Granesan et al. Characterization of Metal Matrix Composites reinforced with suitable reinforcement agents–A Comprehensive Review
CN103643190A (en) Method for improving plastic deformation capacity of aluminum matrix composite
CN112095032B (en) Graphite-reinforced high-thermal-conductivity magnesium-based composite material and preparation method thereof
Yao et al. Reaction-tunable diffusion bonding to multilayered Cu mesh/ZK61 Mg foil composites with thermal conductivity and lightweight synergy
CN110539002A (en) Method for enhancing mechanical property of aluminum matrix composite material by cooperation of multi-element multi-dimensional enhanced phase
Wang et al. Lowering thermal expansion of Mg with the enhanced strength by Ca alloying
CN104711496A (en) Carbon-nanotube-reinforced magnesium/aluminum-base composite material and preparation method thereof
CN105483478A (en) Method for preparing high-strength aluminum alloy
CN105543584A (en) Method for preparing high-strength high-plasticity high-toughness hypo eutectic aluminum silicon alloy material by adopting gravity casting and hot extrusion combined process
CN112746194B (en) Al (aluminum)2O3Method for particle reinforced magnesium-based composite material and application thereof
CN115029590A (en) High-rigidity high-strength high-temperature-resistant aluminum-based composite material and preparation method thereof
Murugan et al. Synthesis of magnesium based nano-composites

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant