CN116571749A - Sandwich structure composite material and preparation method thereof - Google Patents

Sandwich structure composite material and preparation method thereof Download PDF

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Publication number
CN116571749A
CN116571749A CN202310552253.9A CN202310552253A CN116571749A CN 116571749 A CN116571749 A CN 116571749A CN 202310552253 A CN202310552253 A CN 202310552253A CN 116571749 A CN116571749 A CN 116571749A
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composite material
copper
powder
compact
layer
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刘子娟
蔡建兵
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Hunan Aviation Powerplant Research Institute AECC
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Hunan Aviation Powerplant Research Institute AECC
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/02—Compacting only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/1035—Liquid phase sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
    • B22F5/006—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of flat products, e.g. sheets
    • 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
    • C22C1/045—Alloys based on refractory metals
    • 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
    • C22C1/0475—Impregnated alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
    • B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
    • B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
    • B22F2007/042—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal characterised by the layer forming method
    • B22F2007/045—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal characterised by the layer forming method accompanied by fusion or impregnation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention belongs to the field of alloy material preparation, and particularly provides a sandwich structure composite material and a preparation method thereof. The composite material is not broken in the preparation process, and layering phenomenon is not generated.

Description

Sandwich structure composite material and preparation method thereof
Technical Field
The invention belongs to the field of alloy material preparation, and particularly relates to a sandwich structure composite material and a preparation method thereof.
Background
The integrated chip has high power and large heating value, and needs to be packaged by a material with proper thermal expansion coefficient and high heat conduction property. Modern integrated chips mostly use metal-based heat sink composite materials as heat dissipation carriers, and in order to conduct out the heat of the chips rapidly, the heat dissipation carriers are required to have higher heat conduction performance so as to ensure the chips to work normally; meanwhile, the metal-based heat sink composite material serving as a heat dissipation carrier has a thermal expansion coefficient consistent with or close to that of the chip, so that the chip is prevented from being torn and damaged under the repeated actions of thermal expansion and cold contraction.
In order to effectively protect a chip circuit in high-density packaging, the packaging material should be provided with: (1) Good heat conductivity and higher heat conductivity (heat generated by electronic components can be timely and rapidly dissipated when the electronic components work, so that the electronic components are prevented from being invalid due to over high temperature); (2) The density is extremely high, namely the material is compact and has high air tightness; (3) The proper thermal expansion coefficient is matched with the thermal expansion coefficient of the chip materials such as the packaged silicon chip, gallium arsenide, aluminum oxide and the like, so that the chip element is prevented from being damaged and failed due to thermal stress generated by the difference of the thermal expansion of the silicon chip and the gallium arsenide, the aluminum oxide and the like; (4) The material has higher mechanical strength and processability, can be processed into complex shapes, has low material cost and is convenient for mass production.
The copper-molybdenum copper-copper alloy (CPC alloy) is a metal base plane layered composite heat sink material, the material is of a sandwich-like three-layer structure, the middle layer (core material) is a molybdenum copper binary false alloy composite material, and the upper layer and the lower layer are copper layers with high electric conductivity and heat conductivity. The material has good thermal conductivity and adjustable thermal expansion coefficient in the plane direction. The thermal conductivity and the thermal expansion coefficient of the material can be adjusted and changed by adjusting the components of the core material molybdenum copper and changing the proportion (layer thickness ratio) between the three layers.
Currently, copper-molybdenum copper-copper is prepared by a plurality of concentrated rolling combinations, such as: the core material is made of rolling Mo 70 Cu (molybdenum-copper alloy with 70% of molybdenum by mass fraction) is matched with copper plates at two sides, and the copper plates are mechanically attached and meshed together through a rolling process to form a composite material with a three-layer structure. Or three layers of materials are firstly usedAnd stacking, applying certain pressure on the upper surface and the lower surface, and then placing in a heating high-temperature environment to enable atomic diffusion to occur between layers, so that the layers are bonded together to form a whole.
However, when the rolling composite is used for preparing the material, if the initial pass rolling amount is too large, the core material is easy to crack, and a good final product cannot be obtained; if the initial pass rolling amount is too small, the layers cannot be well meshed, and layering phenomenon is easy to occur; the rolling composite process is required to be adjusted according to the thickness ratio of the materials, which is troublesome; the obtained multilayer material has large layer thickness difference between layers, can only be suitable for preparing sheet plates with the thickness of less than 2mm, and can be easily broken and not easily prepared when the mass content of core material particles is more than or equal to 70% by using a rolling composite mode, such as hard and brittle materials such as molybdenum copper/tungsten copper with the Mo or W content of 70-95%.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defects that when the phase mass content of the core material particles in the prior art is more than 70%, the composite material is easy to crack and difficult to prepare and the prepared composite material is small in thickness, so that the preparation method of the composite material with the sandwich structure is provided.
Therefore, the invention provides a preparation method of the sandwich structure composite material, which comprises the following steps of,
s1, step: pressing the powder into a core compact;
s2, step: placing metal plates on two sides of the core material pressed compact, heating, melting the metal plates, and penetrating liquid metal into pores of the core material pressed compact to form a composite material comprising an intermediate layer and a first outer layer and a second outer layer which are positioned on two sides of the intermediate layer, wherein the first outer layer and the second outer layer are both metal plates, and the intermediate layer is an alloy containing metal plate components and core material pressed compact components.
Further, the core material compact is a core material compact of a metal material, wherein the metal component of the core material compact is different from that of the metal plate.
Further, the metal plate is other metal wettable with the core compact. The term "other metal" means a metal component different from that of the core material compact.
Further, the powder in step S1 is a metal powder of a different kind from the metal plate.
Further, the porosity of the core material compact is 5 to 50%, for example, 5 to 30% or 10 to 30%.
Further, the core material compact is selected from a single-layer compact formed by pressing one of molybdenum powder, tungsten powder, siC powder (silicon carbide powder) and Si powder (silicon powder) or a multi-layer compact formed by pressing one or more of molybdenum powder, tungsten powder, siC powder and Si powder.
Wherein the multilayer compacts may be, for example, 2 to 5 layers, for example 2 or 3 layers.
Further, the metal plates of the first and second outer layers are independently selected from copper plates, aluminum plates, or silver plates; preferably, the copper plate is an oxygen-free copper plate, and the aluminum plate is a pure aluminum plate.
Further, in the intermediate layer, the content of the core material compact component is 50 to 95% and the content of the metal plate component is 5 to 50% by weight.
Further, in the intermediate layer, the content of the core material compact component is 70 to 95wt% and the content of the metal plate component is 5 to 30wt%.
Further, the intermediate layer is selected from one of Mo70Cu, mo60Cu, mo50Cu, mo85Cu, mo90Cu, W85Cu and W80 Cu.
Further, in the step S1, the particle size of the powder is 5-9 μm.
Further, the thickness of the core material compact is 2 to 40mm, preferably 9 to 11mm.
Further, the thickness ratio of the first outer layer, the middle layer and the second outer layer is 1:2-10:1-2.
Further, in the step S2, heating is carried out in a graphite boat mold; and/or the heating temperature is higher than the melting point of the metal plate, and the difference between the heating temperature and the melting point is 70-300 ℃.
The invention also provides the sandwich structure composite material prepared by the preparation method of the sandwich structure composite material.
Preferably, the thickness of the composite material is 2 mm-50 mm.
The technical scheme of the invention has the following advantages:
1. the preparation method comprises the steps of pressing powder into a core material pressed compact, placing metal plates on two sides of the core material pressed compact, heating, melting the metal plates, penetrating liquid metal into pores of the pressed compact to form a composite material comprising an intermediate layer (core material) and a first outer layer and a second outer layer which are positioned on two sides of the intermediate layer, wherein the first outer layer and the second outer layer are both metal plates, the intermediate layer is an alloy containing metal plate components and core material pressed compact components, and the original core material pressed compact in the intermediate layer is coated with continuous metal plate components to form an alloy containing metal plate components and core material pressed compact components, and continuous interfaces are formed among the layers. The preparation method is not only suitable for Mo70Cu, mo60Cu, mo50Cu and other materials easy to roll, but also suitable for Mo85Cu, mo90Cu or W90Cu, W85Cu, W80Cu and other harder and more brittle materials, the composite material is not broken in the preparation process, and layering phenomenon is not caused.
Moreover, the sandwich structure alloy with larger total thickness can be prepared. Because the thickness of the core material is unchanged, copper layers on the upper surface and the lower surface can be milled, and sandwich structure composite materials with different designated layer thickness ratios can be rapidly and accurately prepared, so that various layered structure alloys are formed. The preparation method is easy to operate, procedures are reduced, and the preparation efficiency is high.
2. The core material particle phase content of the sandwich composite material provided by the invention can be 50-95%, especially 70-95%, and the sandwich composite material can be suitable for multi-layer structure type composite materials which are not suitable for rolling processing, and simultaneously, metal plates (such as copper layers) on the upper surface and the lower surface can be milled, so that the accurate sandwich structure composite materials with different layer thickness ratios can be rapidly determined, and various layered structure alloys can be formed.
3. According to the preparation method of the Ming-Zhi composite material, the graphite boat mold can be designed according to specific product size specifications and patterns. The size and shape of the pressed compact can be selected according to the design requirement of the product. The sandwich structure alloy with the total thickness of 2mm-40mm can be prepared.
4. According to the preparation method of the Ming and Zhi composite material, the core material can be designed in advance and is formed by powder pressing. Meanwhile, the core material pressed compact can be stacked into a plurality of layers, such as a tungsten layer and a molybdenum layer, and can form a copper-molybdenum copper-tungsten copper-copper four-layer structure. The core material compact may be a molybdenum compact, a tungsten compact, a SiC compact, a Si compact, or the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram showing the placement of a graphite boat tooling, copper plate and molybdenum blank in example 1 of the present invention;
FIG. 2 is a schematic diagram showing the structure of example 1 of the present invention after copper is melted and infiltrated into a molybdenum blank;
FIG. 3 is a schematic view of a copper-molybdenum-copper composite (CPC alloy) of example 1 of the present invention, (a) coarse CPC, (b) refined CPC; (c) CPC121, (d) CPC141;
reference numerals: 1. molybdenum blank; 2. graphite boat tooling; 21. loading a graphite boat; 22. a lower graphite boat; 3. copper plate; 4. molybdenum-copper alloy; 5. a first outer layer; 6. and a second outer layer.
Detailed Description
The following examples are provided for a better understanding of the present invention and are not limited to the preferred embodiments described herein, but are not intended to limit the scope of the invention, any product which is the same or similar to the present invention, whether in light of the present teachings or in combination with other prior art features, falls within the scope of the present invention.
The specific experimental procedures or conditions are not noted in the examples and may be followed by the operations or conditions of conventional experimental procedures described in the literature in this field. The reagents or apparatus used were conventional reagent products commercially available without the manufacturer's knowledge. The layer thickness ratio refers to the ratio of the thicknesses of the first outer layer, the intermediate layer, and the second outer layer.
Example 1
The embodiment provides a preparation method of a sandwich structure composite material, which comprises the following steps:
(1) A mold having a specification of 80mm by 60mm was selected. Weighing 360g of molybdenum powder with the powder granularity of 5.0-7.0 mu m, pouring the molybdenum powder into a die, regulating the pressure of a press to 130MPa, and pressing the molybdenum powder to obtain a porous molybdenum blank 1, wherein the porosity of the molybdenum blank is 30%, the thickness of the molybdenum blank is 11mm, and the molybdenum blank with the size of 80mm multiplied by 60mm multiplied by 11mm is obtained;
(2) A graphite boat tooling 2 (including an upper graphite boat 21 and a lower graphite boat 22) is prepared. Meanwhile, two copper plates 3 (70 mm multiplied by 60mm multiplied by 16mm,75mm multiplied by 60mm multiplied by 11 mm) with proper specifications are cut, and the cut copper plates can be assembled with a graphite boat tool and a porous molybdenum blank in a mode shown in FIG. 1.
(3) The assembly shown in fig. 1 is placed in a hydrogen atmosphere at 1350 ℃ for 2 hours, and the copper sheet is melted and infiltrated into the porous molybdenum blank to form a molybdenum-copper alloy 4, as shown in the schematic diagram of fig. 2. After 2h copper was infiltrated into the porous molybdenum blank to saturate, and the resulting molybdenum-copper alloy was Mo70Cu (mass fraction of molybdenum 70%, mass fraction of copper 30%).
(4) The assembly is cooled and the molten copper resolidifies to form a first outer layer 5 and a second outer layer 6 over and under the molybdenum copper alloy (Mo 70 Cu), respectively. The sample in the graphite boat was taken out to obtain a copper-molybdenum-copper (Mo 70 Cu) -copper composite material with a relatively coarse pattern of sandwich structure, as shown in fig. 3 (a).
(5) The rough copper-molybdenum copper (Mo 70 Cu) -copper composite material was milled to remove the peripheral rough layer and the upper and lower layers, thereby obtaining a copper-molybdenum copper (Mo 70 Cu) -copper block alloy blank having a good appearance, as shown in fig. 3 (b).
A part of the blank was taken, and both the upper and lower copper layers (i.e., the first outer layer and the second outer layer) were each milled and thinned to 5.5mm to obtain a copper-molybdenum-copper (Mo 70 Cu) -copper block alloy having a layer thickness ratio of 1:2:1, as shown in fig. 3 (c). And taking a part of blank, and continuously thinning the upper copper layer and the lower copper layer to 2.75mm to obtain the copper-molybdenum copper (Mo 70 Cu) -copper block alloy with the layer thickness ratio of 1:4:1, wherein the copper block alloy is shown in fig. 3 (d). And taking a part of blank, continuously thinning the copper layer to enable the upper copper layer to be 1.1mm and the lower copper layer to be 2.2mm, obtaining copper-molybdenum copper (Mo 70 Cu) -copper block alloy with the layer thickness ratio of 1:10:2, and obtaining the copper-molybdenum copper (Mo 70 Cu) -copper block alloy with the asymmetric layer thickness ratio.
Example 2
The embodiment provides a preparation method of a sandwich structure composite material, which comprises the following steps:
(1) A mold having a specification of 60mm by 60mm was selected. 295g of molybdenum powder with the powder granularity of 5.0-7.0 mu m is weighed, the molybdenum powder is poured into a mould, the pressure of a press machine is regulated to 200MPa, the molybdenum powder is pressed and molded to obtain a porous molybdenum blank, the porosity of the molybdenum blank is 10%, the thickness of the molybdenum blank is 9mm, and the molybdenum blank with the size of 60mm multiplied by 9mm is obtained.
(2) Cutting two copper plates (55 mm multiplied by 60mm multiplied by 14mm,58mm multiplied by 60mm multiplied by 9 mm), and assembling a molybdenum blank, the copper plates and a graphite boat tool to obtain an assembly, so that the two copper plates are respectively positioned on the upper side and the lower side of the molybdenum blank.
(3) The assembly is placed at 1350 ℃ and heated in hydrogen atmosphere for 2 hours, and the copper sheet is melted and infiltrated into the porous molybdenum blank to form molybdenum-copper alloy (Mo 90 Cu).
(4) The assembly is cooled and the molten copper resolidifies to form a first outer layer and a second outer layer over and under the molybdenum-copper alloy (Mo 90 Cu), respectively. And taking out the sample in the graphite boat to obtain the composite material with the sandwich structure.
The sandwich structure composite material obtained in this example is a block alloy of copper-molybdenum copper (Mo 90 Cu) -copper "sandwich" structure.
Example 3
The embodiment provides a preparation method of a sandwich structure composite material, which comprises the following steps:
(1) A mold having a specification of 60mm by 60mm was selected. Weighing 505g of tungsten powder with the powder granularity of 8.0-9.0 mu m, pouring the tungsten powder into a die, regulating the pressure of a press machine to 210MPa, and performing compression molding on the tungsten powder to obtain a porous tungsten blank, wherein the porosity of the tungsten blank is 10%, the thickness of the tungsten blank is 9mm, and the tungsten blank with the size of 60mm multiplied by 9mm is obtained.
(2) Cutting two copper plates (55 mm multiplied by 60mm multiplied by 14mm,58mm multiplied by 60mm multiplied by 9 mm), and assembling a tungsten blank, the copper plates and a graphite boat tool to obtain an assembly, so that the two copper plates are respectively positioned on the upper side and the lower side of the tungsten blank.
(3) The assembly is placed at 1350 ℃ and heated in hydrogen atmosphere for 2 hours, and the copper sheet is melted and infiltrated into the porous molybdenum blank to form molybdenum-copper alloy (W90 Cu).
(4) The assembly is cooled and the molten copper resolidifies to form a first outer layer and a second outer layer over and under the molybdenum-copper alloy (W90 Cu), respectively. And taking out the sample in the graphite boat to obtain the composite material with the sandwich structure.
The sandwich structure composite material obtained in this example is a block alloy of copper-tungsten copper (W90 Cu) -copper "sandwich" structure.
Example 4
The embodiment provides a preparation method of a sandwich structure composite material, which comprises the following steps:
(1) A mold having a specification of 80mm by 60mm was selected. 605g of tungsten powder with the powder granularity of 8.0-9.0 mu m is weighed, the tungsten powder is poured into a mould, the pressure of a press machine is regulated to 180MPa, the tungsten powder is pressed and molded to obtain a porous tungsten blank, the porosity of the tungsten blank is 15%, the thickness of the tungsten blank is 9mm, and the tungsten blank with the size of 80mm multiplied by 60mm multiplied by 9mm is obtained.
(2) Cutting two copper plates (70 mm multiplied by 60mm multiplied by 14mm,75mm multiplied by 60mm multiplied by 9 mm), and assembling a tungsten blank, the copper plates and a graphite boat tool to obtain an assembly, so that the two copper plates are respectively positioned on the upper side and the lower side of the tungsten blank.
(3) The assembly is placed at 1350 ℃ and heated in hydrogen atmosphere for 2 hours, and the copper sheet is melted and infiltrated into the porous molybdenum blank to form molybdenum-copper alloy (W85 Cu).
(4) The assembly is cooled and the molten copper resolidifies to form a first outer layer and a second outer layer over and under the molybdenum-copper alloy (W85 Cu), respectively. And taking out the sample in the graphite boat to obtain the composite material with the sandwich structure.
The sandwich structure composite material obtained in this example is a block alloy of copper-tungsten copper (W85 Cu) -copper "sandwich" structure.
The sandwich structure composite materials prepared in the embodiments 1 to 4 of the invention are not cracked in the preparation process, and have no layering phenomenon, and the success rate is 100%.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.

Claims (10)

1. A preparation method of a sandwich structure composite material is characterized by comprising the steps of,
s1, step: pressing the powder into a core compact;
s2, step: placing metal plates on two sides of the core material pressed compact, heating, melting the metal plates, and penetrating liquid metal into pores of the core material pressed compact to form a composite material comprising an intermediate layer and a first outer layer and a second outer layer which are positioned on two sides of the intermediate layer, wherein the first outer layer and the second outer layer are both metal plates, and the intermediate layer is an alloy containing metal plate components and core material pressed compact components.
2. The method for preparing a sandwich structure composite material according to claim 1, wherein the core material compact is selected from a single-layer compact formed by pressing one of molybdenum powder, tungsten powder, siC powder and Si powder or a multi-layer compact formed by pressing one or more of molybdenum powder, tungsten powder, siC powder and Si powder.
3. The method of preparing a sandwich structured composite material according to claim 1 or 2, wherein the metal plates of the first and second outer layers are independently selected from copper plates, aluminum plates or silver plates; preferably, the copper plate is an oxygen-free copper plate, and the aluminum plate is a pure aluminum plate.
4. A method of producing a sandwich structured composite material according to any of claims 1-3, wherein in the intermediate layer the core compact composition is present in an amount of 50-95wt% and the metal sheet composition is present in an amount of 5-50wt%.
5. The method of manufacturing a sandwich structured composite material of claim 4, wherein the core compact component is present in the intermediate layer in an amount of 70-95wt% and the metal sheet component is present in an amount of 5-30wt%.
6. The method for preparing a sandwich structured composite material according to any of claims 1-5, wherein in step S1, the particle size of the powder is 5-9 μm.
7. A method of manufacturing a sandwich structured composite material according to any of claims 1-6, wherein the thickness of the core compact is 2-40 mm, preferably 9-11mm.
8. The method of any one of claims 1-7, wherein the first outer layer, the middle layer, and the second outer layer have a thickness ratio of 1:2-10:1-2.
9. The method for preparing a sandwich structured composite material according to any of claims 1-8, wherein in step S2, heating is performed in a graphite boat mold; and/or the heating temperature is higher than the melting point of the metal plate, and the difference between the heating temperature and the melting point is 70-300 ℃.
10. The sandwich structure composite material prepared by the method for preparing the sandwich structure composite material of any one of claims 1-9; preferably, the thickness of the composite material is 2 mm-50 mm.
CN202310552253.9A 2023-05-16 2023-05-16 Sandwich structure composite material and preparation method thereof Pending CN116571749A (en)

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