Base metal-hybrid reinforcement phase composite manufactured by using nanoreinforcement and microreinforcement and manufacturing method therefor

Abstract

The present invention relates to a base metal-hybrid reinforcement phase composite with enhanced strength and thermal properties. Specifically, the base metal-hybrid reinforcement phase composite may comprise: a first base metal-nanoreinforcement phase dispersion seed in which a nanoreinforcement is dispersed in a first base metal; a microreinforcement; and a second base metal matrix in which the first base metal-nanoreinforcement phase dispersion seed and the microreinforcement are dispersed.

Description

Base metal-hybrid reinforced composite material prepared using nano-reinforcers and micro-reinforcers and method for preparing the same

[0001] The present invention relates to a metal-hybrid reinforced composite in which a hybrid reinforced phase formed by nano-reinforcers and micro-reinforcers is stably dispersed in a base metal.

[0002]

[0003] Recently, as environmental regulations such as carbon emission reduction and fuel efficiency improvement have intensified, demanding lighter vehicles, technologies are being developed to replace conventional iron materials with lightweight metal materials like aluminum. Since aluminum is about one-third the weight of iron, using aluminum instead of iron not only provides economic benefits through reduced fuel consumption but also helps resolve environmental pollution issues caused by excessive fuel usage. However, to apply aluminum to various industries, it is necessary to develop technologies that improve mechanical strength and complement thermal properties such as thermal expansion and thermal conductivity.

[0004] Regarding measures to improve the mechanical properties of metals, methods such as forming alloys with carbon or dispersing reinforcing agents in the base metal are being developed. For example, iron-carbon (Fe-C) alloys, in which carbon is dissolved in liquid iron, exhibit higher strength compared to pure metals. However, anionic elements such as carbon have very low solubility in metals other than iron, making it technically difficult to manufacture them in the form of alloys with lightweight metals such as aluminum.

[0005] Meanwhile, regarding the technology of introducing reinforcing materials into metals, the paper Rashad et al., Progress in Natural Science: Materials International, Volume 24, Issue 2, April 2014, 101-108 describes a technology for manufacturing an aluminum-graphene composite by high-temperature sintering a composite powder of aluminum and graphene at 600°C and extruding it at 470°C. In addition, Korean Registered Patent Publication No. 10-1755988 describes a method for manufacturing a nanocarbon-reinforced aluminum composite by coating nanocarbon with ceramic or metal, agglomerating it into ceramic powder, and then adding it to molten aluminum for casting.

[0006] However, the aforementioned technologies involve complex processes and have limitations in improving strength and thermal properties. Various aluminum composite materials attempted to simultaneously satisfy the conflicting characteristics of high thermal conductivity and low thermal expansion contain only a single nano- or micro-reinforcement phase, which limits property modification and makes it difficult to expect complex effects from the mixing of reinforcement phases.

[0007] To address these issues, composite materials in which two types of reinforcing phases are simultaneously mixed are being attempted; however, there are limitations in improving the physical properties of the final composite because it is difficult to achieve uniform dispersion of the two reinforcing phases of different sizes and the reinforcing powders struggle to maintain a spherical shape. Furthermore, there are problems such as the destruction of the nano-reinforcing phase by the micro-reinforcing phase and the lack of a process capable of efficiently dispersing the two types of reinforcing phases simultaneously over a large area at a low cost.

[0008] Aluminum is being used as a material for antenna components in low-orbit communication constellations, which require miniaturization, lightweighting, high integration, and stability in temperature variation environments ranging from -200°C to 100°C. Although aluminum has the advantages of high heat dissipation and lightweight properties, the coefficient of thermal expansion must be significantly reduced to further enhance the structural stability of the system. Therefore, research is being conducted to secure the opposite characteristics of high heat dissipation and low thermal expansion through composites with low thermal expansion reinforcing phases, but application research for resolving interface / dispersion issues and for component development is still lacking.

[0009] Accordingly, there is a need to develop technology that enables the introduction of hybrid reinforcing phases into base metals through a simple process, while ensuring the formation of stable composites by maintaining a spherical particle shape during manufacturing. Furthermore, to meet diverse user needs and apply composites to various applications, there is a necessity to develop technology capable of controlling the strength and thermal properties of composites through the utilization of diverse materials.

[0010]

[0011] The present invention aims to solve the aforementioned conventional problems by providing a base metal-hybrid reinforcing composite in which a hybrid reinforcing phase is stably introduced into the base metal.

[0012] In addition, the present invention aims to provide a method for manufacturing a matrix metal-hybrid reinforced composite by effectively and uniformly dispersing different types of nano and micro reinforcing phases in a simple process.

[0013] In addition, the present invention aims to provide a method for controlling the strength and thermal properties of a matrix metal-hybrid reinforced composite by introducing various nano-reinforcement phases and micro-reinforcement phases.

[0014]

[0015] A base metal-hybrid reinforced composite with improved strength and thermal properties according to one embodiment of the present invention may comprise: a first base metal-nano reinforced phase dispersion seed in which a nano reinforced phase is dispersed in a first base metal; a micro reinforced phase; and a second base metal matrix in which the first base metal-nano reinforced phase dispersion seed and the micro reinforced phase are dispersed.

[0016] According to one embodiment, the first base metal-nano reinforced phase dispersion seed may have the first base metal surrounding the surface of the nano reinforced material, and some part of the surface of the nano reinforced material may be exposed.

[0017] According to one embodiment, the first base metal on the surface of the first base metal-nano reinforced phase dispersion seed may form a metal bond with the second base metal matrix.

[0018] According to one embodiment, the first base metal-nano reinforced phase dispersion seed and the micro-reinforcement material may be dispersed spaced apart from each other within the second base metal matrix.

[0019] According to one embodiment, the first base metal and the second base metal may each independently comprise one or more selected from the group consisting of aluminum (Al), magnesium (Mg), titanium (Ti), copper (Cu), iron (Fe), gold (Au), silver (Ag), manganese (Mn), tin (Sn), zinc (Zn), and alloys thereof.

[0020] According to one embodiment, the nano-reinforcement material may comprise one or more selected from the group consisting of SiC (silicon carbide), TiC (titanium carbide), B4C (boron carbide), Al2O3 (aluminum oxide), MgO (magnesium oxide), TiO2 (titanium oxide), ZrO2 (zirconium oxide), TiB2 (titanium diboride), BN (boron nitride), AlN (aluminum nitride), TiN (titanium nitride), and Si3N4 (silicon nitride).

[0021] According to one embodiment, the nano-reinforcement material may have a particle size of 1 nm to 2,000 nm.

[0022] According to one embodiment, the micro-reinforcement material may comprise one or more selected from the group consisting of SiC (silicon carbide), TiC (titanium carbide), B4C (boron carbide), Al2O3 (aluminum oxide), MgO (magnesium oxide), TiO2 (titanium oxide), ZrO2 (zirconium oxide), TiB2 (titanium diboride), BN (boron nitride), AlN (aluminum nitride), TiN (titanium nitride), Si3N4 (silicon nitride), micro diamond, ZnO (zinc oxide), carbon fiber, graphite flake, and carbon black.

[0023] According to one embodiment, the micro-reinforcement material may have a particle size of 1 μm to 50 μm.

[0024] According to one embodiment, the particle size of the micro-reinforcement may be 2 to 2000 times larger than the particle size of the nano-reinforcement.

[0025] According to one embodiment, the thermal conductivity of the composite material may be 150 W / mK or higher.

[0026] According to one embodiment, the coefficient of thermal expansion (CTE) of the composite material is 15 x 10⁻¹⁰ -6 It may be below / ℃.

[0027] According to one embodiment, the Young's modulus of the composite material may be 100 GPa or higher.

[0028] A method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties according to another embodiment comprises the steps of: designing a base metal-hybrid reinforced composite; forming a first base metal-nano reinforced dispersed seed; and forming a base metal-hybrid reinforced composite in which the first base metal-nano reinforced dispersed seed and a micro-reinforcer are dispersed in a second base metal; wherein the first base metal-nano reinforced dispersed seed is a nano-reinforcer dispersed in a first base metal, and the base metal-hybrid reinforced composite may be a base metal-nano reinforced dispersed seed and a micro-reinforcer dispersed in a second base metal matrix.

[0029] According to one embodiment, the step of designing the base metal-hybrid reinforced composite may involve determining a first base metal, a second base metal, a nano-reinforcement, and a micro-reinforcement by considering the strength, thermal conductivity, and coefficient of thermal expansion of the base metal-hybrid reinforced composite.

[0030] According to one embodiment, the step of forming the first base metal-nano reinforced phase dispersion seed may be to grind a first mixture comprising a first base metal powder and a nano reinforced powder by any one method selected from the group consisting of attrition milling, ball milling, planetary milling, spex milling, vibratory milling, shaker milling, and jet milling.

[0031] According to one embodiment, the step of forming the first base metal-nano reinforced phase dispersion seed may involve adding the nano reinforced powder in an amount of 1% to 10% by mass relative to the total mass of the first mixture.

[0032] According to one embodiment, the step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro reinforced material are dispersed in a second base metal may involve heating and then pressing a second mixture, in which the second base metal powder and the micro reinforced material powder are mixed with the first base metal-nano reinforced phase dispersion seed, in a nitrogen supply atmosphere.

[0033] According to one embodiment, the step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro reinforced material are dispersed in a second base metal may involve adding the micro reinforced material powder in an amount of 2% to 40% by mass relative to the total mass of the second mixture.

[0034]

[0035] The present invention has the effect of providing a matrix metal-hybrid reinforcing composite in which the hybrid reinforcing phase formed by nano and micro reinforcing materials is stably dispersed, thereby improving strength and thermal properties.

[0036] According to the process of the present invention, the metal powder can maintain a spherical shape while effectively dispersing the reinforcing material, and a composite material in which a hybrid reinforcing phase is dispersed in a base metal using a nitrogen atmosphere without reduction conditions can be manufactured.

[0037] In addition, by controlling nano-reinforcements and micro-reinforcements, the strength and thermal properties of the matrix metal-hybrid reinforced composite can be controlled, which has the effect of enabling the manufacture of matrix metal-hybrid reinforced composites suitable for specific needs by adjusting their physical properties.

[0038] However, the effects of the present invention are not limited to those described above, but include all effects naturally realized through the various configurations proposed in the present invention.

[0039]

[0040] FIGS. 1a and 1b are schematic diagrams showing the structure of a first base metal-nano reinforced phase dispersion seed prepared using silicon carbide (SiC) or carbon nanotubes (CNT) as a nano reinforced material, and a base metal-hybrid reinforced phase composite formed using the same.

[0041] Figure 2 is an SEM image of a dispersed seed according to a preparation example.

[0042] Figure 3 is a graph showing the degree to which each type of reinforcing material contributes to the physical properties of the composite material.

[0043] Figures 4a, 4b, and 4c are images analyzing the interface of the composite material according to the size of the second base metal.

[0044] Figure 5 shows the results of analyzing the physical properties of the composite material according to the size of the second base metal.

[0045] Figures 6a, 6b, and 6c are graphs showing the physical properties of composite materials containing various reinforcing materials.

[0046]

[0047] The embodiments of the present invention are illustrative for the purpose of explaining the technical concept of the present invention. The scope of rights according to the present invention is not limited to the embodiments presented below or the specific description thereof.

[0048] All technical and scientific terms used in this invention, unless otherwise defined, have the meaning generally understood by those skilled in the art to which this invention pertains. All terms used in this invention are selected for the purpose of further explaining this invention and are not selected to limit the scope of rights according to this invention.

[0049] Expressions such as "comprising," "having," "having," etc. used in the present invention should be understood as open-ended terms implying the possibility of including other embodiments, unless otherwise stated in the phrase or sentence containing such expressions.

[0050] Unless otherwise stated, singular expressions described in the present invention may include the meaning of the plural form, and this applies likewise to singular expressions described in the claims.

[0051]

[0052] A base metal-hybrid reinforced composite with improved strength and thermal properties according to one embodiment of the present invention may comprise: a first base metal-nano reinforced phase dispersion seed in which a nano reinforced phase is dispersed in a first base metal; a micro reinforced phase; and a second base metal matrix in which the first base metal-nano reinforced phase dispersion seed and the micro reinforced phase are dispersed.

[0053] The matrix metal-hybrid reinforced composite of the present invention comprises a nano-reinforcement phase and a micro-reinforcement phase, and is characterized by the ability to control the strength and thermal properties of the composite by controlling the nano-reinforcement phase and the micro-reinforcement phase. As an example, the matrix metal-hybrid reinforced composite has high strength with a Young's modulus of 100 GPa or more, high thermal conductivity of 150 W / mK or more, and 15X10 -6 It may exhibit a low coefficient of thermal expansion of / ℃ or less.

[0054] In addition, the strength and thermal properties of the above-mentioned base metal-hybrid reinforced composite can be controlled depending on the type and content of the selected base metal, nano-reinforcement phase, and micro-reinforcement phase. For example, a base metal-hybrid reinforced composite with high strength but low thermal properties can be manufactured according to user needs. For example, a base metal-hybrid reinforced composite with high thermal properties but relatively low strength can be manufactured according to user needs.

[0055] The above base metal-hybrid reinforced composite can be formed by first forming a first base metal-nano reinforced disperse seed by dispersing a nano reinforced material in a first base metal, and then dispersing the first base metal-nano reinforced disperse seed and a micro reinforced material in a second base metal matrix through a nitridation process. A detailed method for manufacturing the composite will be described later.

[0056]

[0057] According to one embodiment, the first base metal and the second base metal may each independently comprise one or more selected from the group consisting of aluminum (Al), magnesium (Mg), titanium (Ti), copper (Cu), iron (Fe), gold (Au), silver (Ag), manganese (Mn), tin (Sn), zinc (Zn), and alloys thereof.

[0058] For example, the first base metal and the second base metal may be the same metal. For example, the first base metal and the second base metal may be different metals. For example, the first base metal and the second base metal may be aluminum or an alloy of aluminum, but are not limited thereto. The first base metal and the second base metal may be appropriately selected according to the strength and thermal properties of the base metal-hybrid reinforced composite to be manufactured.

[0059] The first base metal may be a powder having a particle size of 5 μm to 250 μm. Since the first base metal powder has a larger particle size than the nano-reinforcer, the difference in particle size can be utilized during the process of forming a dispersion seed through grinding and curing to induce adsorption and bonding between the first base metal and the nano-reinforcer. Although the first base metal is mixed with the nano-reinforcer in powder form, it can be formed into a bulk form of a first base metal-nano-reinforced phase dispersion seed through a grinding and curing process.

[0060] The second base metal may be a powder having a particle size of 5 μm to 50 μm. Preferably, the second base metal may have a particle size of 8 μm to 30 μm, but is not limited thereto, and may be appropriately selected depending on the strength and thermal properties of the base metal-hybrid reinforced composite to be manufactured.

[0061]

[0062] The above nano reinforcement may include a nano ceramic reinforcement or a nano carbon reinforcement.

[0063] According to one embodiment, the nano reinforcing material may comprise one or more nanoceramic reinforcing materials selected from the group consisting of SiC (silicon carbide), TiC (titanium carbide), B4C (boron carbide), Al2O3 (aluminum oxide), MgO (magnesium oxide), TiO2 (titanium oxide), ZrO2 (zirconium oxide), TiB2 (titanium diboride), BN (boron nitride), AlN (aluminum nitride), TiN (titanium nitride), and Si3N4 (silicon nitride).

[0064] The above nano-reinforcement may comprise one or more nano-carbon reinforcements selected from the group consisting of single-walled carbon nanotubes (SWCNT), double-walled carbon nanotubes (DWCNT), multi-walled carbon nanotubes (MWCNT), graphene, fullerene, graphene oxide (GO), reduced graphene oxide (rGO), graphite, graphite nanoplatelets (GNP), nano-diamond, and carbon black.

[0065] For example, the nano-reinforcement may be SiC (silicon carbide) or c-BN (cubic boron nitride), but is not limited thereto. The nano-reinforcement may be appropriately selected depending on the strength and thermal properties of the base metal-hybrid reinforced composite to be manufactured.

[0066] According to one embodiment, the nano-reinforcement material may have a particle size of 1 nm to 2,000 nm. It may be advantageous for the nano-reinforcement material to have a fine spherical shape to form a first base metal-nano-reinforcement phase dispersion seed having a suitable size and particle size.

[0067] If the particle size of the nano-reinforcement is smaller than 1 nm, the dispersion seeds may be formed too finely, and the effect intended to be achieved through the dispersion seeds may not be sufficiently exerted. If the particle size of the nano-reinforcement exceeds 2,000 nm, the shape of the dispersion seeds may not be formed in a spherical shape, and thus may not be sufficiently dispersed in the composite material. Preferably, the particle size of the nano-reinforcement may be 100 nm to 2,000 nm. More preferably, the particle size of the nano-reinforcement may be 500 nm to 1,500 nm.

[0068]

[0069] According to one embodiment, the micro-reinforcement material may comprise one or more selected from the group consisting of SiC (silicon carbide), TiC (titanium carbide), B4C (boron carbide), Al2O3 (aluminum oxide), MgO (magnesium oxide), TiO2 (titanium oxide), ZrO2 (zirconium oxide), TiB2 (titanium diboride), BN (boron nitride), AlN (aluminum nitride), TiN (titanium nitride), Si3N4 (silicon nitride), micro diamond, ZnO (zinc oxide), carbon fiber, graphite flake, and carbon black.

[0070] For example, the micro-reinforcement may be the same as the nano-reinforcement. For example, the micro-reinforcement may be different from the nano-reinforcement. This can be appropriately selected depending on the strength and thermal properties of the base metal-hybrid reinforced composite to be manufactured.

[0071] According to one embodiment, the micro-reinforcement material may have a particle size of 1 μm to 50 μm.

[0072] If the particle size of the micro-reinforcement is less than 1 μm, the difference in particle size with respect to the nano-reinforcement is not significant, so the strength and thermal property enhancement characteristics intended to be achieved through the hybrid reinforcement phase may not be sufficiently exhibited. If the particle size of the micro-reinforcement exceeds 50 μm, it may aggregate rather than be uniformly dispersed in the second base metal matrix, which may actually reduce the durability of the composite material. Preferably, the micro-reinforcement may have a particle size of 1 μm to 40 μm. More preferably, the micro-reinforcement may have a particle size of 10 μm to 40 μm.

[0073]

[0074] The first base metal-nano-reinforced phase dispersion seed may be formed by mixing the first base metal and the nano-reinforcer, followed by a grinding and curing process. The dispersion seed has a spherical shape rather than a flat shape and may include fine irregularities on the surface of the powder. By having a spherical shape, the dispersion seed can be effectively dispersed into the second base metal matrix during the subsequent nitriding process. Furthermore, by including fine irregularities on its surface, the dispersion seed may possess mechanical interlocking and interfacial properties advantageous for bonding and diffusion with the micro-reinforcer and the second base metal.

[0075] The above dispersion seed may have a diameter of 100 nm to 50 µm. If the diameter of the dispersion seed is less than 100 nm, the physical property enhancement characteristics intended to be achieved through spherical dispersion seeds may not be sufficiently exhibited, and if the diameter exceeds 50 µm, the dispersion of the dispersion seed is not uniform, which may result in reduced dispersibility and durability of the composite material. Preferably, the dispersion seed may be 500 nm to 40 µm. More preferably, the dispersion seed may be 1 µm to 30 µm.

[0076] According to one embodiment, the first base metal-nano reinforced phase dispersion seed may have the first base metal surrounding the surface of the nano reinforced material, and some part of the surface of the nano reinforced material may be exposed.

[0077] In the grinding process, a plastic fluidized bed may be formed on the surface of the first base metal powder due to repeated impact and transmission, at which time surrounding nano-reinforcement particles may be embedded in the surface of the first base metal powder, or the fluidized bed of the first base metal may cover the nano-reinforcement.

[0078] The above dispersion seed may be one in which the surface of the nano-reinforcement is modified with a first base metal. The above dispersion seed may be formed in a form in which the nano-reinforcement particles are covered by a first base metal fluid layer and thinly coated. Since the first base metal has high ductility, it can surround the nano-reinforcement particles and form a pocket structure through the above process. Some parts of the surface of the nano-reinforcement particles may have the coating layer locally thinned or peeled off due to collisions or peeling between particles during the grinding process, thereby exposing the nano-reinforcement.

[0079] The above dispersion seed may be one in which the surface of the first base metal particle is modified with a nano-reinforcement. Through a process including grinding and curing, nano-reinforcement particles present around the first base metal particle may be embedded in the surface of the first base metal particle and thinly coated. Some parts of the surface of the first base metal particle may have the nano-reinforcement coating thinned or lost, exposing the first base metal.

[0080] According to one embodiment, the first base metal on the surface of the first base metal-nano reinforced phase dispersion seed may form a metal bond with the second base metal matrix.

[0081] The above-mentioned first base metal-nano-reinforced phase dispersion seed can be manufactured into a base metal-hybrid reinforced phase composite through a nitriding process in which the micro-reinforcer and the second base metal are heated and then compressed in a nitrogen-supplying atmosphere. Through this process, the dispersion seed and the micro-reinforcer are uniformly dispersed in the second base metal matrix, and reaction products can be formed at each interface.

[0082] The first base metal or the first base metal coating layer exposed to the first base metal-nano reinforced phase dispersion seed can form a solid-phase diffusion bond with the second base metal matrix and effectively fix the dispersion seed to the second base metal matrix. Through this, the dispersion seed can be uniformly dispersed in the second base metal matrix. In addition, a thin reaction layer can be intentionally formed at the interface, thereby improving the interfacial bonding strength. Furthermore, the exposed first base metal or the first base metal coating layer can suppress excessive reactions at the interface, thereby improving interfacial stability.

[0083] According to one embodiment, the first base metal-nano reinforced phase dispersion seed and the micro-reinforcement material may be dispersed spaced apart from each other within the second base metal matrix.

[0084] Within the second base metal matrix, the micro-reinforcement can act as a spacer maintaining physical spacing, thereby promoting the uniform distribution of the dispersion seeds and micro-reinforcement. Through this, the dispersion seeds and micro-reinforcement can be evenly dispersed within the second base metal matrix while maintaining spacing from one another without aggregating.

[0085]

[0086] According to one embodiment, the particle size of the micro-reinforcement may be 2 to 2000 times larger than the particle size of the nano-reinforcement.

[0087] The composite material of the present invention comprises nano-reinforcements and micro-reinforcements of different sizes, and can have a combined effect of hybrid reinforcement. In addition, it can improve the problem of conventional difficulty in uniformly dispersing two different types of reinforcement.

[0088] The present invention allows for the uniform dispersion of different reinforcing materials having a size of 10 μm or more and a size of 1 μm or less by first forming a dispersed seed containing a nano reinforcing material and then dispersing a micro reinforcing material. Preferably, the particle size of the micro reinforcing material may be 10 to 1000 times larger than the particle size of the nano reinforcing material.

[0089] Nano reinforcements can form a uniform, multi-path load-bearing structure by distributing and transferring loads within the grains and at the interfaces, while micro reinforcements do so over relatively large areas of the second base metal matrix.

[0090] Nanoreinforcements are advantageous for modifying mechanical properties, but due to their large specific surface area, uniform dispersion is difficult when dispersed beyond a certain volume fraction, and there are limitations in lowering the coefficient of thermal expansion. Microreinforcements are advantageous for lowering the coefficient of thermal expansion, but they have limitations in that they increase brittleness and provide insufficient strength improvement.

[0091] If only nano-reinforcements are included, strength is high but toughness may be reduced, and if only micro-reinforcements are included, toughness is high but the micro-reinforcement effect may be limited. By including both nano-reinforcements and micro-reinforcements, the above composite material can secure both strength and toughness.

[0092] Micro-reinforcements can secure heat conduction pathways, and nano-reinforcements can improve thermal conductivity by reducing grain boundary resistance within the secondary base metal matrix. Furthermore, since nano-reinforcements and micro-reinforcements suppress thermal expansion through different mechanisms, this also offers the effect of precisely controlling the target coefficient of thermal expansion value.

[0093] Since the nano reinforcement is first formed as a dispersion seed together with the first base metal, it is possible to improve the dispersibility of two types of reinforcements of different sizes while solving the problem of the nano reinforcement being destroyed by the micro reinforcement.

[0094] The above-mentioned dispersed seed can transmit micro-loads through the nano-reinforcement, and the micro-reinforcement can support macro-loads, so the composite material can exhibit multi-scale reinforcing effects. Through this, the nano-reinforcement can refine the grain size to disperse mechanical loads, and the micro-reinforcement can block cracks and suppress thermal expansion.

[0095] In addition, the nano-reinforcement and micro-reinforcement can form different interfacial reaction layers with the first base metal or the second base metal, respectively, thereby forming a multi-interfacial bonding structure. Specifically, the interface between the first base metal and the nano-reinforcement, the interface between the dispersion seed and the second base metal, and the interface between the micro-reinforcement and the second base metal can be interconnected to form a continuous hybrid reinforcement phase. Through this, the mechanical strength and thermal conductivity of the composite material can be improved, and the coefficient of thermal expansion can be reduced.

[0096] The above composite material can exhibit a synergistic effect between nano-reinforcements and micro-reinforcements, and thus may have the characteristic of showing improved strength and thermal properties compared to composites containing only nano-reinforcements or only micro-reinforcements.

[0097] According to one embodiment, the thermal conductivity of the composite material may be 150 W / mK or higher.

[0098] The above composite material has improved thermal properties and high thermal conductivity, and can also be applied as a heat dissipation material where rapid heat diffusion and transfer are required. The above composite material may exhibit a thermal conductivity of 100 W / mK to 190 W / mK, and preferably, the thermal conductivity of the above composite material may be 160 W / mK or higher. More preferably, the thermal conductivity of the above composite material may be 170 W / mK or higher.

[0099] According to one embodiment, the coefficient of thermal expansion (CTE) of the composite material is 15 x 10⁻¹⁰ -6 It may be below / ℃.

[0100] The coefficient of thermal expansion of the above composite material is 10X10 -6 / ℃ to 20X10 -6 It can be / ℃, preferably 14X10 -6 It may be / ℃ or lower. More preferably, the coefficient of thermal expansion (CTE) of the composite material is 13 x 10⁻⁶ -6 It may be below / ℃.

[0101] The aforementioned composite material has a low coefficient of thermal expansion, which enhances product reliability by reducing component deformation caused by heat, and can be advantageously utilized for weight reduction when its specific gravity is low. Furthermore, it can be applied in various fields requiring high thermal conductivity and a low coefficient of thermal expansion, such as heat dissipation materials, optical platforms and structures for satellites and spacecraft, precision equipment components for semiconductors and displays, electrical and electronic packaging, heat sinks, and battery cooling plates.

[0102]

[0103] According to one embodiment, the Young's modulus of the composite material may be 100 GPa or higher.

[0104] The above composite material has increased mechanical strength through a hybrid reinforcing phase, and can support loads and prevent cracks. In addition, hardness can be improved through micro-reinforcements, and the wear resistance and scratch resistance of the entire composite material can be enhanced. The above composite material can extend its lifespan by suppressing the wear rate in high-speed friction or collision environments. Preferably, the Young's modulus of the above composite material may be 130 GPa or higher. More preferably, the Young's modulus of the above composite material may be 150 GPa or higher.

[0105] The specific strength ((F / A) / ρ) of the above composite is 50 MPa / (g / cm²). 3 ) to 150 MPa / (g / cm²) 3 ), preferably 100 MPa / (g / cm²) 3 It may be more than )

[0106]

[0107] A method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties according to another embodiment comprises the steps of: designing a base metal-hybrid reinforced composite; forming a first base metal-nano reinforced dispersed seed; and forming a base metal-hybrid reinforced composite in which the first base metal-nano reinforced dispersed seed and a micro-reinforcer are dispersed in a second base metal; wherein the first base metal-nano reinforced dispersed seed is a nano-reinforcer dispersed in a first base metal, and the base metal-hybrid reinforced composite may be a base metal-nano reinforced dispersed seed and a micro-reinforcer dispersed in a second base metal matrix.

[0108] The description of each component included in the present manufacturing method is as described above.

[0109]

[0110] 1. Step of designing the base metal-hybrid reinforced composite

[0111] According to one embodiment, the step of designing the base metal-hybrid reinforced composite may involve determining a first base metal, a second base metal, a nano-reinforcement, and a micro-reinforcement by considering the strength, thermal conductivity, and coefficient of thermal expansion of the base metal-hybrid reinforced composite.

[0112] The composite material of the present invention comprises various types of first base metals, second base metals, nano-reinforcements, and micro-reinforcements, and the strength and thermal properties of the manufactured composite material may differ depending on each selected configuration. Therefore, the first base metal, second base metal, nano-reinforcement, and micro-reinforcement selected can be adjusted differently to manufacture a composite material suitable for the user's desired physical property specifications.

[0113] For example, if it is required that the composite material have high thermal conductivity, one of SiC (silicon carbide), BN (boron nitride), and diamond can be selected as the micro-reinforcer. For example, if it is required that the composite material have high strength, one of diamond or SiC (silicon carbide) can be selected as the micro-reinforcer. However, the selection of micro-reinforcers is not limited to these, and various micro-reinforcers can be utilized depending on the user's needs.

[0114]

[0115] 2. A step of forming a first base metal-nano reinforced phase dispersion seed;

[0116] The above base metal-hybrid reinforced composite may include the steps of mixing a first base metal and a nano-reinforcer selected in the step of designing the base metal-hybrid reinforced composite to form a first mixture, and grinding and curing the first mixture.

[0117] Specifically, the step of forming the first base metal-nano reinforced phase dispersion seed may include: (i) a step of preparing a mixed powder by grinding a first mixture comprising a first base metal powder and a nano reinforced powder; and (ii) a step of curing the mixed powder to form a first base metal-nano reinforced phase dispersion seed in which the nano reinforced material is dispersed in the first base metal.

[0118] The above step involves dispersing a nano-reinforcer in a first base metal to form a seed, and controlling the shape, size, and surface characteristics of the dispersed seed so that a nitriding process can be applied. Through this, the first base metal-nano-reinforced phase dispersed seed can be manufactured in the form of a powder that maintains a spherical shape with a particle size of less than 50 μm.

[0119] Through the above grinding and curing process, the dispersion seed may have fine irregularities formed on its surface, thereby possessing interfacial characteristics favorable for bonding with the micro-reinforcer and the second base metal. Additionally, the dispersion seed can promote effective dispersion and bonding by covering the surface of the first base metal powder particles with a nano-reinforcer or by coating the surface of the nano-reinforcer particles with a fluid layer of the first base metal.

[0120] As a result, the above-mentioned dispersion seed can be effectively dispersed into a second base metal matrix through a subsequent step, and a composite material in which a hybrid reinforcing phase is dispersed in the base metal can be manufactured using a nitrogen atmosphere without reduction conditions. Furthermore, the composite material can exhibit excellent mechanical properties and high thermal conductivity.

[0121] FIGS. 1a and 1b are schematic diagrams showing the structure of a first base metal-nano reinforced phase dispersion seed prepared using silicon carbide (SiC) or carbon nanotubes (CNT) as a nano reinforced material, and a base metal-hybrid reinforced phase composite formed using the same.

[0122] According to one embodiment, the step of forming the first base metal-nano reinforced phase dispersion seed may involve adding the nano reinforced powder in an amount of 1% to 10% mass relative to the total mass of the first mixture (a mixture of the first base metal powder and the nano reinforced powder).

[0123] If the above nano-reinforcement powder is less than 1 mass% of the total mass, the effect intended to be achieved through the nano-reinforcement may not be sufficiently exhibited, and if it exceeds 10 mass%, the dispersibility of the nano-reinforcement may actually decrease. Preferably, the above nano-reinforcement powder may be added in an amount of 1.5 mass% to 8 mass%, more preferably 2 mass% to 6 mass%. Within the above range, the nano-reinforcement can be well dispersed within the first base metal powder to exhibit effects of improved thermal conductivity and strength control, and the prepared dispersed seed can have characteristics suitable for application in a nitriding process.

[0124] According to one embodiment, the step of forming the first base metal-nano reinforced phase dispersion seed may involve grinding a first mixture comprising a first base metal powder and a nano reinforced powder by any one method selected from the group consisting of attrition milling, ball milling, planetary milling, spex milling, vibratory milling, shaker milling, and jet milling. The grinding is preferably performed using attrition milling for uniform dispersion of the nano reinforced material, but is not limited thereto.

[0125] In the above grinding process, the nano-reinforcement can be dispersed as the powder is ground through impact and shear motion caused by rotation, and the rotational speed may be 100 rpm to 800 rpm, preferably 400 rpm to 700 rpm, specifically 500 rpm to 600 rpm. By adjusting the conditions in this way, the nano-reinforcement can be well dispersed within the first base metal powder, and the manufactured seed can have characteristics suitable for application in a nitriding process.

[0126] The above grinding process can be performed in the presence of an additive to weaken the bonding of the nano-reinforcement. The additive may be stearic acid (CH3(CH2) 16 COOH, stearic acid), sodium chloride (NaCl), potassium chloride (KCl), sodium sulfate (Na2SO4), hexane, heptane, octane, oxalic acid ((COOH)2·H2O), methanol, ethanol, isopropyl alcohol, acetone, toluene, Nopcowax-22 DSP(C2H2-2(C 18 H36 Additives that can prevent over-bonding between the ball and the container powder, such as ON), ethylenebisdistearamide), trichlorotrifluoroethane, and organosilicon compounds, may be used, and preferably, stearic acid may be used.

[0127] When the above additive is used, not only can cold bonding occurring during the grinding of the nano reinforcement be prevented, but van der Waals bonds can also be weakened, thereby improving the dispersibility of the nano reinforcement.

[0128] In the present invention, the curing process after grinding can be performed by heat treatment at 400°C to 600°C, preferably 450°C to 550°C, and it may be preferable to perform it under vacuum conditions. In addition, the curing process can be performed for 5 to 60 minutes, preferably 10 to 30 minutes.

[0129]

[0130] 3. A step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro-reinforcement are dispersed in a second base metal.

[0131] Through the above steps, a first base metal-nano reinforcement phase dispersion seed is formed in which a nano reinforcement is dispersed in a first base metal, and a composite material can be manufactured by mixing a second base metal powder and a micro reinforcement powder with the dispersion seed and sintering.

[0132] The first base metal-nano reinforced phase dispersion seed can be added in an amount of 2% to 50% by weight relative to the total weight of the second mixture (a mixture of the first base metal-nano reinforced phase dispersion seed, the second base metal powder, and the micro-reinforcement powder).

[0133] If the above dispersion seed is added in an amount of less than 2 mass% with respect to the total mass of the second mixture, the effect of strengthening strength and thermal properties by the dispersion seed may be negligible, and if it exceeds 30 mass%, the dispersibility of the dispersion seed may decrease and aggregate. Preferably, the above dispersion seed may be added in an amount of 5 mass% to 40 mass%, more preferably 10 mass% to 30 mass% with respect to the total mass of the second mixture.

[0134] For example, when aluminum is used as the second base metal, thermal conductivity can be improved by adding 5 to 15 mass% of the first base metal-nano reinforced phase dispersion seed.

[0135] For example, when using an aluminum alloy as the second base metal, a composite material with excellent strength and thermal conductivity can be manufactured by adding 15 mass% to 25 mass% of a first base metal-nano reinforcing phase dispersion seed. In addition, if the mass of the dispersion seed is increased to 30 mass% or more, the coefficient of thermal expansion can be lowered.

[0136] According to one embodiment, the step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro reinforced material are dispersed in a second base metal may involve adding the micro reinforced material powder in an amount of 2% to 40% by mass relative to the total mass of the second mixture.

[0137] If the above micro-reinforcement powder is added in an amount of less than 2 mass% with respect to the total mass of the second mixture, the effect intended to be achieved through the micro-reinforcement may not be sufficiently exhibited, and if it exceeds 40 mass%, the dispersibility of the micro-reinforcement may decrease and it may aggregate. Preferably, the above micro-reinforcement powder may be added in an amount of 5 mass% to 35 mass% with respect to the total mass of the second mixture, and more preferably in an amount of 10 mass% to 30 mass%.

[0138] For example, when 30 mass% of SiC is mixed as a micro-reinforcement, a composite material with excellent mechanical strength and a very low coefficient of thermal expansion can be manufactured.

[0139] In the present invention, by using a dispersion seed modified in shape, size, and surface characteristics to be applicable to a nitriding process, a hybrid reinforcing phase of micro-reinforcers and nano-reinforcers can be successfully dispersed in a base metal using a nitriding process.

[0140] According to one embodiment, the step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro reinforced material are dispersed in a second base metal may involve heating and then pressing a second mixture, in which the second base metal powder and the micro reinforced material powder are mixed with the first base metal-nano reinforced phase dispersion seed, in a nitrogen supply atmosphere.

[0141] Specifically, the step of forming a base metal-hybrid reinforced composite may include: (iii) a step of mixing a second base metal powder and a micro-reinforcement powder with the first base metal-nano reinforced disperse seed to form a second mixture; and (iv) a step of heating and pressing the second mixture in a nitrogen supply atmosphere to form a base metal-hybrid reinforced composite in which the first base metal-nano reinforced disperse seed and the micro-reinforcement are dispersed in the second base metal.

[0142] The above nitrogen supply atmosphere can be formed using nitrogen (N2) gas or ammonia (NH3) gas. Additionally, it is possible to form a nitrogen supply atmosphere by mixing a non-oxidizing gas (Ar or H2 gas) with the nitrogen gas.

[0143] In this way, when the second mixture is heated in a nitrogen supply atmosphere, a nitriding reaction occurs in which nitrogen elements react with the metal, and at this time, as the metal forms a matrix, the dispersed seed and micro-reinforcement are combined and dispersed to form a composite material.

[0144] In the above process, the heating temperature may be 500°C to 800°C, preferably 600°C to 700°C. In addition, the heating may be performed for 10 to 120 minutes, preferably 30 to 90 minutes, specifically 40 to 80 minutes.

[0145] The pressing process after heating can be performed using a hot press, at a temperature of 500°C to 700°C, preferably 550°C to 650°C, more preferably 560°C to 600°C, and even more preferably 580°C to 590°C. Additionally, the pressing process can be performed for 10 to 120 minutes, preferably 30 to 90 minutes, specifically 40 to 80 minutes.

[0146] In the present invention, by utilizing the process described above and controlling the process conditions, it is possible to insert and disperse a nano-reinforcement while the first base metal particles maintain a spherical shape, and to manufacture a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersed seed and a micro-reinforcement are dispersed in a second base metal.

[0147]

[0148] The present invention will be explained in more detail through the following examples. However, these examples represent some experimental methods and configurations to illustrate the invention, and the scope of the invention is not limited to these examples.

[0149]

[0150] Preparation Example: Preparation of a base metal-hybrid reinforced composite

[0151] Al powder (particle size 108–150 µm) and nano-reinforcements such as SiC (particle size 1 µm) or CNT (particle size 32 ± 10 nm) were mixed, and attrition milling was performed at 550 rpm for 6 to 16 hours. At this time, 1.5 g of stearic acid (CH3(CH2) 16 The mixture was ground by adding COOH, and the Ball Powder Ratio (BPR) was adjusted to 15:1. Through the above process, a mixed powder was formed in which a nano-reinforcer was mixed with Al. Subsequently, the mixed powder was cured under vacuum conditions at 500°C for 20 minutes to form a dispersed seed in which a nano-reinforcer was dispersed in a first base metal (Al).

[0152] Al or Al 6061 (particle size 10 μm) as a second base metal and SiC (particle size 10 μm) as a micro-reinforcer were mixed with the above dispersion seed. A tubular mixture process was performed at 76 rpm for 30 minutes during mixing to produce a base metal-hybrid reinforced composite, and it was confirmed whether the nitriding process was successfully performed.

[0153] A base metal-hybrid reinforced composite was prepared by heating to 660°C for 60 minutes in a nitrogen supply atmosphere, and then hot pressing at 580°C to 590°C for 1 hour, in which a micro-reinforcement material was dispersed in a combination of a first base metal-nano reinforced phase dispersed seed and a second base metal.

[0154]

[0155] Example 1: Analysis of physical properties according to reinforcing material composition and process

[0156] The sizes of dispersion seeds prepared by varying the nano-reinforcement and milling time in the method of the preparation examples are listed in Table 1, and SEM images (scale 100 μm) of the dispersion seeds of each preparation example are shown in Figure 2.

[0157]

[0158]

[0159]

[0160] When a composite material was manufactured by performing a nitriding process on the dispersion seeds prepared according to each of the above manufacturing examples, it was confirmed that the dispersion seeds of Manufacturing Example 2 and Manufacturing Example 3 had a spherical shape of uniform size and that the nitriding process was successfully performed. In particular, the dispersion seed of Manufacturing Example 3 had a spherical shape with a diameter of about 18 μm, so the nitriding process was performed more appropriately. On the other hand, the dispersion seed of Manufacturing Example 1 had a flat shape rather than a spherical shape, and due to its size of 100 μm to 150 μm, the nitriding process was not successfully performed.

[0161] Through the above results, it was confirmed that the size of the dispersed seed containing the nano-reinforcement must be 40㎛ or less, and the shape must be properly maintained as a round spherical shape rather than a flat one, so that the subsequent nitriding process with the micro-reinforcement can be successfully carried out.

[0162]

[0163] A composite material in which a reinforcing agent is dispersed in a base metal was prepared by adding a nano-reinforcement, a micro-reinforcement, or a mixture thereof to a base metal. Composite material samples were prepared using the method of the preparation example, but with the composition and process changed as shown in Table 2 below, and the results of measuring the physical properties of each sample are shown in Table 3 below.

[0164]

[0165]

[0166]

[0167]

[0168] Through the above experimental results, it was confirmed that when a reinforcing material is introduced into a base metal, the mechanical properties vary depending on the type, process, and content of the reinforcing material. However, when only one type of reinforcing material is used, or when a hybrid reinforcing phase is formed by milling nano-reinforcements and micro-reinforcements at once, the thermal conductivity for improving mechanical properties is at a maximum level of 130 W / mK, indicating a limit in reaching the target value.

[0169]

[0170] Example 2: Analysis of physical properties according to the composition of the base metal-hybrid reinforced phase dispersion seed

[0171] Based on the method of the manufacturing example, a stepwise reinforcing phase was formed, but the composition of the base metal and reinforcing material was varied as in manufacturing example samples 2-1 to 2-12 to manufacture a base metal-hybrid reinforcing phase composite, and the results of measuring the physical properties of each sample are shown in Table 4 below.

[0172]

[0173]

[0174]

[0175] Referring to the experimental results above, it was confirmed that the composite material manufactured according to the present invention had a relative density of 98% to 99% and was well sintered. In addition, when a first base metal-nano reinforcing phase dispersion seed was formed according to the present invention and a second base metal powder and a micro reinforcing material were mixed with the seed to form a hybrid reinforcing phase through a nitriding process, the micro / nano reinforcing material was stably dispersed, resulting in a high thermal conductivity of the composite material of 140 W / mK or higher, particularly 150 W / mK or higher.

[0176] In particular, when aluminum was used as the second base metal, it was confirmed that the thermal conductivity was excellent when the ratio of the first base metal to the nano-reinforced phase dispersion seed was 10 mass%, and the strength was excellent when it was 30 mass%. Meanwhile, when an aluminum alloy was used as the second base metal, it was confirmed that the thermal conductivity and strength were excellent when the ratio of the first base metal to the nano-reinforced phase dispersion seed was 20 mass%, and the strength was high and the coefficient of thermal expansion was low when it was 30 mass%.

[0177] Accordingly, it was confirmed that when using the present invention, a hybrid steel image is successfully formed in the nitriding process, thereby forming a composite material with excellent thermal conductivity, and that various physical properties can be controlled depending on the type and content of the metal and reinforcing material.

[0178]

[0179] Example 3: Analysis of physical properties of composite materials according to the type of reinforcing material

[0180] Composite materials were manufactured using the method of the manufacturing example, but with different types and contents of the base metal and reinforcing material as shown in Table 5 below, and the physical properties of each sample were measured and are shown in Table 6 below.

[0181] In the samples of Table 5, diamond with a particle size of 15-25 μm was used, SiC with a particle size of 10 μm was used as the micro-reinforcement, and c-BN at 12.53 mass% was used. As the first base metal-nano-reinforcement phase dispersion seed, a dispersion in which 5 wt% of SiC nano-reinforcement with a particle size of 1 μm was dispersed in Al was used. In addition, the ratio of each component is expressed in mass% (wt%).

[0182]

[0183]

[0184]

[0185]

[0186] Referring to the experimental results above, when 5 mass% of nano-reinforcement material was added to the first base metal-nano-reinforced phase dispersion seed and SiC was used as a micro-reinforcement material at a ratio of 30 mass%, results were obtained in which the mechanical strength was high and the coefficient of thermal expansion was very low at 12.08 ppm / K.

[0187] When c-BN was introduced as a micro-reinforcement, the thermal conductivity was highest at 175.74 W / mK, but the coefficient of thermal expansion was relatively high at 18.30 ppm / K, and the Young's modulus was also relatively low.

[0188] Meanwhile, under conditions where the ratio of the reinforcing material was the same at 20 mass%, it was confirmed that the thermal conductivity improved when mixed with diamond compared to SiC alone. Accordingly, it was found that the thermal conductivity, coefficient of thermal expansion, and strength could be controlled depending on the type and content of the micro-reinforcing material.

[0189] Figure 3 is a graph showing the degree to which each type of reinforcing material contributes to the physical properties of the composite material.

[0190] As can be seen in Figure 3, it was confirmed that the degree of contribution to yield strength, coefficient of thermal expansion (CTE), and thermal conductivity (TC) differs depending on the dispersion seed and micro-reinforcement. Through this, it was confirmed that the physical properties of the composite can be controlled depending on the type of nano-reinforcement and micro-reinforcement included in the composite.

[0191]

[0192] Example 4: Interfacial analysis of the composite according to the size of the second base metal

[0193] To analyze the interfacial effects of the composite according to the size of the second base metal, Al with a particle size of 10 μm to 40 μm was used as the second metal. As the seed for the first base metal-nano reinforcement phase dispersion, a dispersion in which 5 wt% of SiC nano reinforcement with a particle size of 1 μm was dispersed in Al was used, and 17.5 mass% of SiC was used as the micro reinforcement. Then, the interface of the prepared composite was analyzed using a transmission electron microscope.

[0194] Figures 4a, 4b, and 4c are images analyzing the interface of the composite material according to the size of the second base metal.

[0195] Based on the above results, it was confirmed that when the second base metal is 10 μm (a), continuous Al-ON and Mg-O layers are formed at the interface of Al, improving wettability and bonding strength, and that AlN is observed within the matrix. Additionally, it was confirmed that a continuous oxygen layer is observed within the Al-ON layer, and that a distinct Mg-O layer is observed on the SiC side.

[0196] On the other hand, when the second base metal was 40 μm (b), it was confirmed that the Al interface was discontinuous and non-uniform, with almost no oxygen, and that Mg2Si was formed near the interface instead of MgO. It was also confirmed that the formation of an oxygen layer in the Al-ON layer was weak.

[0197] In addition, through TEM images of composites in which the second base metal was 10㎛, 20㎛, 30㎛, and 40㎛, it was confirmed that the particle size of the second base metal affects the nitridation of the interface, and that as the particle size decreases, the interface layer and oxygen layer are formed thicker and more continuously, thereby improving the interfacial bonding strength.

[0198] This suggests that when the powder diameter of the second base metal is similar to that of the micro-reinforcement, optimal filling can be formed between the two particles and they can adhere to each other, and the nitriding reaction can occur by forming a continuous phase.

[0199] Figure 5 shows the results of analyzing the physical properties of the composite material according to the size of the second base metal.

[0200] Through the above results, it was confirmed that the hardness at the Al-SiC interface is highest when the size of the second base metal is 10 μm, and decreases as the size of the second base metal increases. In addition, it was confirmed that the Young's modulus also decreases as the size of the second base metal increases.

[0201] Through this, it was confirmed that the smaller the size of the second base metal, the better the interfacial characteristics of the composite, thereby enhancing the material properties of the composite. Furthermore, it was found that when the second base metal powder forms a size consistent with that of the reinforcing material, a continuous phase is formed at the interface; as the interfacial hardness is high and mechanical energy transfer at the interface is efficient, the strength of the composite is also improved.

[0202] Figures 6a, 6b, and 6c are graphs showing the physical properties of composite materials containing various reinforcing materials.

[0203] FIGS. 6a and 6b are a graph and a table showing the physical properties of embodiments containing various reinforcing materials, and in the same embodiment, when heat treatment was performed, it is indicated as a shape with the interior uncolored.

[0204] Thermal conductivity (TC) of the composite material: 150 W / mK and coefficient of thermal expansion (CTE): 15 x 10⁻⁶ -6 The graphs were separated based on / ℃ to divide them into quadrants 1 through 4. The composite material with the greatest improvement in thermal properties had a thermal conductivity of 150 W / mK or higher and a coefficient of thermal expansion (CTE) of 15 x 10⁻⁶ -6 It is less than / ℃ and can be included in the fourth quadrant.

[0205] Through the above results, it was confirmed that the thermal properties of the composite material of the present invention can be controlled through nano-reinforcements or micro-reinforcements. In particular, it was confirmed that thermal conductivity can be increased or decreased and the coefficient of thermal expansion can be increased or decreased by adjusting the process or the included reinforcement differently from Example 1 (n-Al / SiC+m-Al / SiC or n-Al / CNT+m-Al / SiC). It was also confirmed that the strength of the composite material can be improved.

[0206] Thus, it was confirmed that the strength and thermal properties of the base metal-hybrid reinforced composite of the present invention can be controlled by adjusting the type, content, and size of the first base metal, the second base metal, the nano-reinforcement, and the micro-reinforcement.

[0207]

[0208] The foregoing description is merely an illustrative explanation of the technical concept of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations within the scope of the essential characteristics of the present invention. Accordingly, the embodiments disclosed in the present invention are intended to explain, not limit, the technical concept of the present invention, and the scope of the technical concept of the present invention is not limited by these embodiments. The scope of protection of the present invention shall be interpreted by the claims below, and all technical concepts within an equivalent scope shall be interpreted as being included within the scope of rights of the present invention.

Claims

1. A first base metal-nano reinforced phase dispersion seed in which a nano reinforced material is dispersed in a first base metal; Micro reinforcement; and A second base metal matrix in which the first base metal-nano reinforced phase dispersion seed and the micro-reinforcement material are dispersed; comprising Base metal-hybrid reinforced composite with improved strength and thermal properties.

2. In Paragraph 1, The above first base metal-nano reinforced phase dispersion seed has the first base metal surrounding the surface of the nano reinforced material, and A portion of the surface of the above nano-reinforcement is where the nano-reinforcement is exposed, Base metal-hybrid reinforced composite with improved strength and thermal properties.

3. In Paragraph 3, The first base metal on the surface of the first base metal-nano reinforced phase dispersion seed forms a metallic bond with the second base metal matrix, Base metal-hybrid reinforced composite with improved strength and thermal properties.

4. In Paragraph 1, The first base metal-nano reinforced phase dispersion seed and the micro-reinforcement are dispersed spaced apart from each other within the second base metal matrix, Base metal-hybrid reinforced composite with improved strength and thermal properties.

5. In Paragraph 1, The first base metal and the second base metal each independently comprise one or more selected from the group consisting of aluminum (Al), magnesium (Mg), titanium (Ti), copper (Cu), iron (Fe), gold (Au), silver (Ag), manganese (Mn), tin (Sn), zinc (Zn), and alloys thereof. Base metal-hybrid reinforced composite with improved strength and thermal properties.

6. In Paragraph 1, The above nano-reinforcement comprises one or more selected from the group consisting of SiC (silicon carbide), TiC (titanium carbide), B4C (boron carbide), Al2O3 (aluminum oxide), MgO (magnesium oxide), TiO2 (titanium oxide), ZrO2 (zirconium oxide), TiB2 (titanium diboride), BN (boron nitride), AlN (aluminum nitride), TiN (titanium nitride), and Si3N4 (silicon nitride). Base metal-hybrid reinforced composite with improved strength and thermal properties.

7. In Paragraph 1, The above nano-reinforcement has a particle size of 1 nm to 2,000 nm, Base metal-hybrid reinforced composite with improved strength and thermal properties.

8. In Paragraph 1, The above micro-reinforcement material comprises one or more selected from the group consisting of SiC (silicon carbide), TiC (titanium carbide), B4C (boron carbide), Al2O3 (aluminum oxide), MgO (magnesium oxide), TiO2 (titanium oxide), ZrO2 (zirconium oxide), TiB2 (titanium diboride), BN (boron nitride), AlN (aluminum nitride), TiN (titanium nitride), Si3N4 (silicon nitride), micro diamond, ZnO (zinc oxide), carbon fiber, graphite flake, and carbon black. Base metal-hybrid reinforced composite with improved strength and thermal properties.

9. In Paragraph 1, The above micro-reinforcement material has a particle size of 1㎛ to 50㎛, Base metal-hybrid reinforced composite with improved strength and thermal properties.

10. In Paragraph 1, The particle size of the micro-reinforcement is 2 to 2000 times larger than the particle size of the nano-reinforcement. Base metal-hybrid reinforced composite with improved strength and thermal properties.

11. In Paragraph 1, The thermal conductivity of the above composite material is 150 W / mK or higher. Base metal-hybrid reinforced composite with improved strength and thermal properties.

12. In Paragraph 1, The coefficient of thermal expansion (CTE) of the above composite material is 15 x 10⁻⁶ -6 That which is / ℃ or lower, Base metal-hybrid reinforced composite with improved strength and thermal properties.

13. In Paragraph 1, The Young's modulus of the above composite is 100 GPa or higher, Base metal-hybrid reinforced composite with improved strength and thermal properties.

14. Step of designing a base metal-hybrid reinforced composite; A step of forming a first base metal-nano reinforced phase dispersion seed; and The step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro-reinforcement are dispersed in a second base metal; comprising The above-mentioned first base metal-nano reinforced phase dispersion seed is a first base metal in which a nano reinforced material is dispersed, and The above base metal-hybrid reinforced composite is one in which the first base metal-nano reinforced dispersed seed and the micro-reinforcement are dispersed in a second base metal matrix, Method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties.

15. In Paragraph 14, The step of designing the above-mentioned base metal-hybrid reinforced composite is, Determining the first base metal, second base metal, nano reinforcement, and micro reinforcement by considering the strength, thermal conductivity, and coefficient of thermal expansion of the above-mentioned base metal-hybrid reinforced composite, Method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties.

16. In Paragraph 14, The step of forming the first base metal-nano reinforced phase dispersion seed is, A first mixture comprising a first base metal powder and a nano-reinforcement powder is ground by any one method selected from the group consisting of attrition milling, ball milling, planetary milling, spex milling, vibratory milling, shaker milling, and jet milling. Method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties.

17. In Paragraph 16, The step of forming the first base metal-nano reinforced phase dispersion seed is, The above nano-reinforcing powder is added in an amount of 1% to 10% by mass relative to the total mass of the first mixture. Method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties.

18. In Paragraph 14, The step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro-reinforcement are dispersed in a second base metal is, A second mixture comprising a second base metal powder and a micro-reinforcement powder mixed with a first base metal-nano-reinforcement phase dispersion seed, which is heated and then compressed in a nitrogen supply atmosphere. Method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties.

19. In Paragraph 18, The step of forming a base metal-hybrid reinforced composite in which a first base metal-nano reinforced phase dispersion seed and a micro-reinforcement are dispersed in a second base metal is, The above micro-reinforcing powder is added in an amount of 2% to 40% by mass relative to the total mass of the second mixture. Method for manufacturing a base metal-hybrid reinforced composite with improved strength and thermal properties.

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