CN113373347B - High-strength, high-toughness, high-heat-conductivity and easy-welding aluminum-based composite material for 5G base station and preparation method thereof - Google Patents
High-strength, high-toughness, high-heat-conductivity and easy-welding aluminum-based composite material for 5G base station and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an aluminum-based composite material, in particular to a high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum-based composite material for a 5G base station and a preparation method thereof. The invention prepares the high-strength high-heat-conductivity easily-welded aluminum-based composite material strip for the 5G base station by chemical composition design, in-situ nano-particle strengthening and refining, rare earth microalloying technology and a development and design electromagnetic ultrasonic control double-roller continuous casting and rolling device. The composite material strip prepared by the technology has fine crystal grains, nano rare earth precipitated phases contained in the crystal grains and high-heat-conduction in-situ nano ceramic particles contained in the crystal grain boundaries, so that the room-temperature toughness and the heat conductivity of the alloy are obviously improved, the crystal grain boundary content is improved due to the design of low-melting-point alloy components and the obvious refinement of the crystal grains, and the cold welding property of the alloy strip in tandem rolling is effectively improved.
Description
Technical Field
The invention relates to an aluminum-based composite material, in particular to a high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum-based composite material for a 5G base station and a preparation method thereof.
Background
With the development and application of the fifth generation mobile communication technology (5G technology), the power consumption of the 5G base station active antenna unit is 3 times that of the 4G base station (up to 1300W individually), and the high power consumption has higher and higher requirements on the heat conductivity of the heat dissipation substrate material and the design and manufacture. The current blowing type aluminum heat dissipation substrate is a novel phase-change efficient heat dissipation structure, a hollow aluminum plate shell is manufactured through processes of runner printing, lap-rolling cold welding, blowing forming and the like, then the substrate is prepared through phase-change working medium vacuum infusion and welding sealing, the heat conductivity coefficient of the substrate can reach 50000W/(m x K), and the substrate is 5-10 times of that of a traditional copper/aluminum extrusion type heat dissipation substrate and is brand new application on a 5G base station. However, the strength and the thermal conductivity of the commonly used 3003 aluminum alloy are low, and the airtightness of the phase change working medium cavity after the cold stitch welding is low, which becomes a major problem faced by the current aluminum material for the blown heat dissipation substrate.
The method improves the alloy strength through component regulation and control, improves the air tightness through grain refinement and increasing the cold welding temperature of the pack rolling, and is a main method for improving the performance and the yield of the blown aluminum heat dissipation substrate at present. The invention patent with the application number of CN 20191069191412.7 reports a blowing-expanding type water-cooling plate and a preparation method of a used composite plate, the method improves the strength of the alloy through the component adjustment of Mn, fe and Cu, refines alloy crystal grains through the regulation and control of Ti element, and improves the basic cold weldability and yield of tandem rolling through strict temperature and time control; however, the introduction of a large amount of alloy elements can reduce the thermal conductivity, corrosion resistance and ductility and toughness of the alloy, the capability of a single Ti element for grain refinement is limited, and high pack rolling temperature causes extremely rapid growth of grains, thus being not beneficial to the thermal conductivity and formability of the alloy. Therefore, the development of novel aluminum materials for 5G base station blowing type heat dissipation substrates and the preparation technology thereof are urgent.
Disclosure of Invention
The invention aims to provide a high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum matrix composite material for a 5G base station and a preparation method thereof aiming at the defects of the prior art. The method is characterized in that the high-strength high-heat-conductivity easily-welded aluminum-based composite material strip for the 5G base station is prepared by a chemical composition design, in-situ nano-particle strengthening and refining, a rare earth microalloying technology and a development and design electromagnetic ultrasonic control double-roller continuous casting and rolling device.
The high-strength high-toughness high-heat-conductivity easily-welded aluminum-based composite material for the 5G base station is characterized in that a high-strength high-heat-conductivity easily-welded aluminum-based composite material cast-rolled strip for the 5G base station is prepared by a chemical composition design, in-situ nanoparticle strengthening and refining, a rare earth microalloying technology and a developed and designed electromagnetic ultrasonic regulation and control double-roller continuous casting and rolling device. The cast-rolled strip of the aluminum-based composite material comprises the following components, by mass, 1.0-1.5% of Si, 0.6-1.0% of Fe, 0.05-0.2% of Cu, 1.0-2.0% of Mn, 0.5-1.0% of Zr, 0.5-1.0% of Ti, 0.5-2.0% of B, 0.2-1.0% of O, 0.05-0.3% of Er, 0.05-0.3% of Sc, 0.1-0.5% of Y, less than or equal to 0.5% of Zn, less than or equal to 0.5% of Mg, less than or equal to 0.5% of Cr, and the balance Al.
The high-strength, high-toughness, high-heat-conductivity and easily-welded aluminum-based composite material for the 5G base station is characterized in that: the chemical composition design is that the content of Si is improved to 1.0-1.5wt.% on the basis of the 3003 aluminum alloy for the traditional heat dissipation substrate so as to further reduce the melting point of the alloy, and Zr, ti, B, O, er, sc and Y are added into the alloy so as to realize in-situ nano-particle strengthening and refining, rare earth micro-alloying, matrix grain refining and improvement of the obdurability and the tandem rolling weldability of the alloy.
The high-strength, high-toughness, high-heat-conductivity and easily-welded aluminum-based composite material for the 5G base station is characterized in that: the in-situ nano-particle is strengthened and refined by the reaction of in-situ reaction powder and Al melt to generate nano ZrB with high hardness, high heat conduction and low expansion 2 、Al 2 O 3 、TiB 2 Ceramic particles. On one hand, the nano ceramic particles can be used as heterogeneous nucleation cores of alpha-Al, matrix grains are obviously refined and are finally distributed in the crystal interior/crystal boundary, and the toughness of the composite material is improved through the interaction with dislocation; on the other hand, the nano ceramic particles synthesized in situ effectively refine the matrix grains, obviously improve the grain boundary content and reduce the cold welding temperature of the pack rolling. The size of the nano particles is 10-100nm, and the content of the nano particles is 1-15% of the volume of the composite material. The in-situ reaction powder is Co 3 O 4 ，K 2 ZrF 6 ，K 2 TiF 6 ，KBF 4 ，Na 2 B 4 O 7 ，ZrO 2 ，B 2 O 3 And Al 2 (SO 4 ) 3 Two or more of.
The high-strength, high-toughness, high-heat-conductivity and easily-welded aluminum-based composite material for the 5G base station is characterized in that: the rare earth microalloying is to compositely add Sc, er and Y rare earth elements into a composite material and form dispersed nano Al with Al and Zr elements in matrix grains 3 Er、Al 3 Sc、Al 3 (Er+Zr)、Al 3 (Sc+Zr)、Al 3 The Y rare earth precipitates, so that the strength and the work hardening capacity of the composite material are remarkably improved, and good ductility is obtained; meanwhile, the addition of the rare earth elements can purify the melt, eliminate air hole impurities and improve the in-situ nano-ceramicsThe wettability of the ceramic particles promotes the spheroidization of the in-situ nano ceramic particles, and realizes the synergistic coupling strengthening and toughening of the in-situ nano ceramic particles and rare earth elements.
The high-strength, high-toughness, high-heat-conductivity and easily-welded aluminum-based composite material for the 5G base station is characterized in that: the grain size of the aluminum-based composite material cast-rolled strip is less than or equal to 60 mu m, the tensile strength is more than or equal to 250MPa, the yield strength is more than or equal to 120MPa, and the elongation is more than or equal to 20%.
The 5G base station is with high aluminium base composite material of high tough high heat conduction easily welding, its characterized in that: the heat conductivity coefficient of the cast-rolled strip of the aluminum-based composite material is more than or equal to 250W/(m.multidot.K), and is improved by more than 30% compared with that of 3003 aluminum alloy (190W/(m.multidot.K)).
The high-strength, high-toughness, high-heat-conductivity and easily-welded aluminum-based composite material for the 5G base station is characterized in that: the pack rolling welding temperature of the aluminum-based composite material cast-rolled strip is less than or equal to 500 ℃, and due to the existence of in-situ nano ceramic particles and rare earth nano dispersed phases, the growth of crystal grains in the pack rolling welding process is effectively inhibited, and the high-strength, high-toughness, high-heat-conductivity and easy welding of the composite material strip is realized.
The preparation method of the high-strength, high-toughness, high-heat-conductivity and easily-welded aluminum-based composite material for the 5G base station is characterized by being prepared by adopting a designed electromagnetic ultrasonic control double-roller continuous casting device, and comprising the following specific steps of:
(1) In-situ reaction powder is uniformly blown into the aluminum melt in a suspending way through an air flow channel of a degassing system;
(2) In-situ synthesizing nano ceramic particles under the non-contact stirring action of a spiral magnetic field;
(3) Then adding rare earth intermediate alloy for uniform compounding to obtain a composite material melt, and improving the uniform distribution of in-situ nano ceramic particles and rare earth elements in the melt by means of high-energy ultrasound;
(4) And finally, obtaining the composite material strip through casting and rolling.
The electromagnetic ultrasonic control double-roll continuous casting and rolling device comprises a spiral magnetic field, a degassing system, a filtering system, a liquid level control launder, a high-energy ultrasonic device, a casting nozzle, a casting and rolling machine and a strip coiling machine, and is shown in the attached figure 1. Wherein, the spiral magnetic field is arranged around a melting pool of the degassing system and used for non-contact spiral electromagnetic stirring of the melt; the degassing system consists of a molten pool and a hollow suspension blowing rotor and is used for degassing the melt and blowing in-situ reaction powder into the melt, the degassing system is communicated with the filtering system, the filtering system is communicated with the liquid level control launder, and the high-energy ultrasonic device is arranged in the liquid level control launder at the front end of the casting nozzle and is used for promoting the uniform dispersion of in-situ nano reinforcement and the homogenization of melt components; and the casting and rolling machine and the belt coiling machine are sequentially arranged at the rear end of the casting nozzle.
Furthermore, a ceramic filter screen is arranged in the filter system.
Furthermore, a shearing machine is arranged at the rear end of the casting and rolling machine, and a spraying system is arranged on one side of the casting and rolling machine.
The preparation method of the high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum matrix composite for the 5G base station is characterized by comprising the following steps of: in the step (2), the in-situ reaction temperature is 850-900 ℃, the reaction time is 20-30min, in the step (1), ar gas with the purity of 99.99% is adopted for degassing, and the rotating speed of a suspension blowing rotor is 300-400r/min.
The preparation method of the high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum-based composite material for the 5G base station is characterized by comprising the following steps of: in the step (2), the frequency of the spiral magnetic field is 15-30Hz, and the strength is 0.3-0.5T.
The high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum-based composite material for the 5G base station and the preparation device thereof are characterized in that: and (3) adding rare earth intermediate alloy in the form of Al-20Er, al-5Sc and Al-10Y.
The preparation method of the high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum matrix composite for the 5G base station is characterized by comprising the following steps of: and (3) high-energy ultrasound in the step (3), wherein the ultrasound power is 5-10kW, and the ultrasound mode is continuous ultrasound.
The preparation method of the high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum matrix composite for the 5G base station is characterized by comprising the following steps of: and (4) casting and rolling, wherein the temperature of the melt in the casting nozzle is kept between 700 and 720 ℃.
The invention improves the content of Si element on the basis of 3003 alloy so as to reduce the melting point of crystal boundary and reduce cold welding temperature of pack rolling; in-situ synthesizing high-strength, high-modulus and high-heat-conductivity nano ceramic reinforcement in the alloy as a heterogeneous nucleation core of Al to refine alloy grains, improve the content of alloy grain boundaries, and largely distribute in the crystal interior and the grain boundaries in a final solidification structure, thereby achieving the purposes of reducing the cold welding temperature of alloy tandem rolling, improving the air tightness, inhibiting the growth of recrystallized grains and improving the toughness of the alloy; rare earth elements are added into the alloy in a compounding way to purify the melt, eliminate air hole inclusions, improve the wettability of in-situ nano ceramic particles, promote the spheroidization of the in-situ nano ceramic particles, refine crystal grains efficiently, improve the corrosion resistance of the alloy, form a large amount of nano dispersed phases in the crystal grains and obviously improve the comprehensive performance of the alloy.
Drawings
Fig. 1 is a schematic diagram of an electromagnetic ultrasonic controlled twin-roll continuous casting device according to the present invention.
FIG. 2 is a representation of a composite material prepared by the apparatus of the present invention; (a) metallographic structure photograph; (b) scanning electron microscope photos of the grain boundary in-situ nano ceramic particles; and (c) transmission electron microscope photo of intragranular rare earth nanometer precipitated phase.
Detailed Description
The present invention may be practiced according to the following examples, but is not limited to the following examples; as used herein, unless otherwise indicated, the term "comprises" and "comprising" have the meaning commonly understood by one of ordinary skill in the art; it will be understood that these examples are intended to illustrate the invention, and are not intended to limit the scope of the invention in any way; in the following examples, various processes and methods not described in detail are conventional methods well known in the art.
Examples 1
The composite material comprises the following components (in percentage by mass) of 1.2 Si, 0.8 Fe, 0.1 Cu, 1.5 Mn, 0.8 ZrTi, 0.8 Ti, 1.0B, 0.8O, 0.2 Er, 0.2 Sc, 0.2Y, 0.2 Zn, 0.2 Mg, 0.2 Cr and the balance Al.
Adding 5T industrial pure aluminum ingots into an industrial natural gas smelting furnace, melting to 870 ℃, preserving heat, weighing, adding Al-20Si, al-20Cr, fe agent (content 70%), mn agent (content 70%), pure Cu, pure Zn, pure Mg and the like, and adjusting alloy components to design values; the stirring degassing system and the electromagnetic stirring are started in a heat preservation furnace (850 ℃) of the tilting injection electromagnetic ultrasonic regulation and control double-roller continuous casting and rolling deviceA stirring system for blowing weighed and dried K from a degassing pipeline by Ar gas with the purity of 99.99 percent 2 ZrF 6 、K 2 TiF 6 、KBF 4 And Na 2 B 4 O 7 Mixing the powder with Al melt to generate nano ZrB in situ 2 、Al 2 O 3 、TiB 2 The total time for blowing the mixed powder into the melt is 30min, the stirring speed of the suspension rotor is 350r/min, the electromagnetic stirring frequency is 30Hz, and the strength is 0.5T; after the in-situ reaction is finished, adding Al-10Zr, al-5Sc, al-20Er and Al-10Y intermediate alloy, adjusting the alloying component to the design value, and standing for 15min under the condition of heat preservation; after being filtered by a ceramic filter screen, the mixture is led into a liquid level control heat preservation launder, the temperature is controlled at 710 ℃, a high-energy ultrasonic generating device is started, the ultrasonic power is 5kW, and continuous ultrasonic is carried out to improve the uniformity of an in-situ nano ceramic reinforcement in a melt; then the composite material strip with the length of 2cm is produced by a casting and rolling machine. The structure of the cast-rolled composite strip is shown in fig. 2. The test result shows that the aluminum matrix composite cast-rolled strip has the crystal grains of 53 mu m, the tensile strength of 280MPa, the yield strength of 140MPa, the elongation of 22 percent, the heat conductivity coefficient of 253W/(mK) which is improved by more than 30 percent compared with 3003 aluminum alloy (190W/(mK)), the cold welding temperature of the stitch rolling is 380 ℃, the crystal grain size after the stitch rolling is further refined to 45 mu m, the tensile strength is 300MPa, the yield strength is 162MPa, and the air tightness after the blowing is good.
EXAMPLES example 2
The composite material comprises the following components (in percentage by mass) of 1.0 Si, 0.6 Fe, 0.05 Cu, 1.0 Mn, 0.5 Zr, 0.5 Ti, 0.5B, 0.5O, 0.05 Er, 0.05 Sc, 0.05Y, 0.5 Zn, 0.5 Mg, 0.5 Cr and the balance Al.
Adding 5T industrial pure aluminum ingots into an industrial natural gas smelting furnace, melting to 900 ℃, preserving heat, weighing, adding Al-20Si, al-20Cr, fe agent (content 70%), mn agent (content 70%), pure Cu, pure Zn, pure Mg and the like, and adjusting alloy components to design values; the stirring degassing system and the electromagnetic stirring system are started in a holding furnace (870 ℃) of a tilting injection electromagnetic ultrasonic control double-roll continuous casting and rolling device, and weighed and dried K is blown in from a degassing pipeline by Ar gas with the purity of 99.99 percent 2 ZrF 6 、K 2 TiF 6 、KBF 4 And Na 2 B 4 O 7 Mixing the powder with Al melt to generate nano ZrB in situ 2 、Al 2 O 3 、TiB 2 The total time of blowing the mixed powder into the melt is 20min, the stirring speed of the suspension-blowing rotor is 400r/min, the electromagnetic stirring frequency is 20Hz, and the strength is 0.3T; after the in-situ reaction is finished, adding Al-10Zr, al-5Sc, al-20Er and Al-10Y intermediate alloy, adjusting the alloying component to the design value, and standing for 15min under the condition of heat preservation; after being filtered by a ceramic filter screen, the mixture is led into a liquid level control heat preservation launder, the temperature is controlled at 700 ℃, a high-energy ultrasonic generating device is started, the ultrasonic power is 5kW, and continuous ultrasonic is carried out to improve the uniformity of in-situ nano ceramic reinforcement in the melt; then the composite material strip with the length of 2cm is produced by a casting and rolling machine. The test result shows that the aluminum matrix composite cast-rolled strip has the crystal grains of 58 mu m, the tensile strength of 250MPa, the yield strength of 123MPa, the elongation of 26 percent, the thermal conductivity coefficient of 251W/(m & ltk & gt), which is improved by more than 30 percent compared with 3003 aluminum alloy (190W/(m & ltk & gt)), the cold welding temperature of the lap rolling is 410 ℃, the crystal grain size after the lap rolling is further refined to 50 mu m, the tensile strength is 267MPa, the yield strength is 134MPa, and the air tightness after the blowing is good.
Embodiment example 3
The composite material comprises the following components (in percentage by mass) of Si 1.5, fe 1.0, cu 0.2, mn 2.0, zr1.0, ti 1.0, B2.0, O1.0, er 0.3, sc 0.3, Y0.5, zn 0.1, mg 0.1, gr 0.1, and the balance of Al.
Adding 5T industrial pure aluminum ingots into an industrial natural gas smelting furnace, melting at 900 ℃, preserving heat, weighing, adding Al-20Si, al-20Cr, fe agent (content 70%), mn agent (content 70%), pure Cu, pure Zn, pure Mg and the like, and adjusting alloy components to design values; the stirring degassing system and the electromagnetic stirring system are started, and weighed and dried K is blown in from a degassing pipeline by Ar gas with the purity of 99.99 percent in a heat preservation furnace (890 ℃) of a tilting injection electromagnetic ultrasonic control double-roll continuous casting and rolling device 2 ZrF 6 、K 2 TiF 6 、KBF 4 And Na 2 B 4 O 7 Mixing the powder and Al melt to generate nano ZrB in situ 2 、Al 2 O 3 、TiB 2 The total time of blowing the mixed powder into the melt is 25min, the stirring speed of the suspension-blowing rotor is 350r/min, the electromagnetic stirring frequency is 30Hz, and the strength is 0.5T; after the in-situ reaction is finished, adding Al-10Zr, al-5Sc, al-20Er and Al-10Y intermediate alloy, adjusting the alloying component to the design value, and standing for 15min under the condition of heat preservation; after being filtered by a ceramic filter screen, the mixture is led into a liquid level control heat-preservation launder, the temperature is controlled at 730 ℃, a high-energy ultrasonic generating device is started, the ultrasonic power is 10kW, and continuous ultrasonic is carried out to improve the uniformity of in-situ nano ceramic reinforcement in a melt; then the composite material strip with the length of 2cm is produced by a casting and rolling machine. The test result shows that the aluminum matrix composite cast-rolled strip has the crystal grain size of 45 microns, the tensile strength of 320MPa, the yield strength of 183MPa, the elongation of 20 percent, the heat conductivity coefficient of 250W/(m K) which is improved by more than 30 percent compared with that of 3003 aluminum alloy (190W/(m K)), the cold welding temperature of the lap rolling is 350 ℃, the crystal grain size after the lap rolling is further refined to 40 microns, the tensile strength is 345MPa, the yield strength is 197MPa, and the air tightness after the blow-up is good.
Claims (8)
- The high-strength high-toughness high-heat-conductivity easily-welded aluminum-based composite material for the 5G base station is characterized in that a high-strength high-heat-conductivity easily-welded aluminum-based composite material cast-rolled strip for the 5G base station is prepared by chemical component design, in-situ nanoparticle strengthening and refining, rare earth microalloying technology and an electromagnetic ultrasonic regulation double-roll continuous casting-rolling device; the aluminum-based composite material cast-rolled strip comprises the following components in percentage by mass: 1.0 to 1.5 percent of Si, 0.6 to 1.0 percent of Fe, 0.05 to 0.2 percent of Cu, 1.0 to 2.0 percent of Mn, 0.5 to 1.0 percent of Zr, 0.5 to 1.0 percent of Ti, 0.5 to 2.0 percent of B, 0.2 to 1.0 percent of O, 0.05 to 0.3 percent of Er, 0.05 to 0.3 percent of Sc, 0.1 to 0.5 percent of Y, less than or equal to 0.5 percent of Zn, less than or equal to 0.5 percent of Mg, less than or equal to 0.5 percent of Cr, and the balance of Al; the chemical composition design is that the content of Si is improved to 1.0-1.5wt.% on the basis of 3003 aluminum alloy so as to further reduce the melting point of the alloy, and Zr, ti, B, O, er, sc and Y are added into the alloy so as to realize in-situ nanoparticle strengthening and refining, rare earth microalloying, matrix grain refining and improvement of the obdurability and the roll weldability of the alloy; the grain size of the aluminum-based composite material cast-rolled strip is less than or equal to 60 mu m, the tensile strength is more than or equal to 250MPa, the yield strength is more than or equal to 120MPa, and the elongation is more than or equal to 20 percent; the heat conductivity coefficient of the cast-rolled strip of the aluminum-based composite material is more than or equal to 250W/(mK), and is improved by more than 30% compared with 190W/(mK) of 3003 aluminum alloy; the lap welding temperature of the cast-rolled strip of the aluminum-based composite material is less than or equal to 500 ℃.
- 2. The high-strength high-toughness high-heat-conductivity easy-welding aluminum-based composite material for the 5G base station as claimed in claim 1, wherein the in-situ nano particles are reinforced and refined by reacting in-situ reaction powder with Al melt to generate nano ZrB with high hardness, high heat conductivity and low expansion 2 、Al 2 O 3 、TiB 2 Ceramic particles; on one hand, the nano ceramic particles can be used as heterogeneous nucleation cores of alpha-Al, matrix grains are obviously refined and are finally distributed in the intragranular/crystal boundary, and the toughness of the composite material is improved through the interaction with dislocation; on the other hand, the nano ceramic particles synthesized in situ efficiently refine matrix grains, the grain boundary content is obviously improved, and the cold welding temperature of the pack rolling is reduced; the size of the in-situ nano particles is 10-100nm, and the content of the in-situ nano particles is 1-15% of the volume of the high-strength, high-toughness, high-heat-conductivity and easily-welded aluminum-based composite material; the in-situ reaction powder is Co 3 O 4 ，K 2 ZrF 6 ，K 2 TiF 6 ，KBF 4 ，Na 2 B 4 O 7 ，ZrO 2 ，B 2 O 3 And Al 2 (SO 4 ) 3 Two or more of them.
- 3. The high-toughness high-heat-conductivity easy-welding aluminum-based composite material for the 5G base station as claimed in claim 1, wherein the rare earth microalloying is to add Sc, er and Y rare earth elements into the composite material in a compounding way to form dispersed nano Al with Al and Zr elements in matrix grains 3 Er、Al 3 Sc、Al 3 （Er+Zr）、Al 3 （Sc+Zr）、Al 3 The Y rare earth precipitates, so that the strength and the work hardening capacity of the composite material are remarkably improved, and good ductility is obtained; meanwhile, the addition of the rare earth elements can purify the melt, eliminate air hole impurities, improve the wettability of the in-situ nano ceramic particles, promote the spheroidization of the in-situ nano ceramic particles and realize the in-situ nano ceramic particlesThe synergistic coupling of the grains and the rare earth elements strengthens and toughens the grains.
- 4. The preparation method of the high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum-based composite material for the 5G base station as claimed in claim 1, wherein the composite material is prepared by adopting an electromagnetic ultrasonic control double-roll continuous casting device, and the preparation method comprises the following specific steps:(1) In-situ reaction powder is uniformly blown into the aluminum melt in a suspending way through an air flow channel of a degassing system;(2) In-situ synthesizing nano ceramic particles under the non-contact stirring action of a spiral magnetic field;(3) Then adding rare earth intermediate alloy for uniform compounding to obtain a composite material melt, and improving the uniform distribution of in-situ nano ceramic particles and rare earth elements in the melt by means of high-energy ultrasound;(4) And finally, obtaining the composite material strip through casting and rolling.
- 5. The preparation method of the high-strength high-toughness high-heat-conductivity easy-welding aluminum-based composite material for the 5G base station, as claimed in claim 4, is characterized in that the electromagnetic ultrasonic control double-roll continuous casting device comprises a spiral magnetic field, a degassing system, a filtering system, a liquid level control launder, a high-energy ultrasonic device, a casting nozzle, a casting machine and a strip coiling machine, wherein the spiral magnetic field is arranged around a molten pool of the degassing system and used for spiral electromagnetic stirring of a non-contact melt; the degassing system consists of a molten pool and a hollow suspension blowing rotor and is used for degassing the melt and blowing in-situ reaction powder into the melt, the degassing system is communicated with a filtering system, the filtering system is communicated with a liquid level control launder, and a high-energy ultrasonic device is arranged in the liquid level control launder at the front end of the casting nozzle and is used for promoting the uniform dispersion of in-situ nano reinforcement and the homogenization of melt components; the casting and rolling machine and the strip coiling machine are sequentially arranged at the rear end of the casting nozzle.
- 6. The preparation method of the high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum matrix composite material for the 5G base station as claimed in claim 5, wherein a ceramic filter screen is arranged in the filter system; the rear end of the casting and rolling machine is provided with a shearing machine, and one side of the casting and rolling machine is provided with a spraying system.
- 7. The preparation method of the high-strength, high-toughness, high-heat-conductivity and easy-welding aluminum matrix composite material for the 5G base station as claimed in claim 4, wherein in the step (1), ar gas with the purity of 99.99% is adopted for degassing, and the rotating speed of a suspension blowing rotor is 300-400r/min; in the step (2), the in-situ reaction temperature is 850-900 ℃, the reaction time is 20-30min, the frequency of the spiral magnetic field is 15-30Hz, and the intensity is 0.3-0.5T; in the step (3), adding rare earth intermediate alloy in the form of Al-20Er, al-5Sc and Al-10Y; high-energy ultrasound, wherein the ultrasound power is 5-10kW, and the ultrasound mode is continuous ultrasound.
- 8. The method for preparing the high-strength high-toughness high-heat-conductivity easy-welding aluminum-based composite material for the 5G base station as claimed in claim 4, wherein in the step (4), the melt temperature in the casting and rolling nozzle is kept at 700-720 ℃.
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| PCT/CN2021/098104 WO2022246888A1 (en) | 2021-05-28 | 2021-06-03 | High-strength and toughness, high-thermal-conductivity, and easy-to-weld aluminum-based composite material for 5g base station and preparation method therefor |
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| CN101391290B (en) * | 2008-11-05 | 2010-12-08 | 江苏大学 | Method for synthesizing metal matrix composition using metal reaction under the coupling action of magnetic field and ultrasonic field |
| CN103103405B (en) * | 2013-01-28 | 2015-04-08 | 华峰铝业股份有限公司 | Multi-element micro-alloyed high-strength aluminum-manganese alloy and preparation method thereof |
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