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CN-122007418-A - Aluminum alloy composite material of light new energy automobile radiator and preparation process thereof

CN122007418ACN 122007418 ACN122007418 ACN 122007418ACN-122007418-A

Abstract

The invention discloses an aluminum alloy composite material of a lightweight new energy automobile radiator and a preparation process thereof, and belongs to the technical field of aluminum alloy casting. The process comprises the steps of preparing a core layer blank by generating TiB 2 particles in situ in a core layer melt, atomizing a surface layer melt containing Sc and Zr, injecting hydrophobic modified iron particles, depositing the hydrophobic modified iron particles on the surface of the core layer to form a composite blank, realizing interface metallurgical bonding through variable-temperature hot rolling, and finally obtaining a finished product through cold rolling and annealing. The invention realizes the strong matching of the core layer and the anticorrosive layer through TiB 2 enhancement and microalloying, allows the material to be thinned greatly, eliminates interface thermal resistance by utilizing jet deposition, establishes a double anticorrosive mechanism by means of hydrophobic iron particles, and solves the problems of low strength, limited heat conduction and poor corrosion resistance of the aluminum alloy composite material for the traditional radiator.

Inventors

  • PU YULIANG
  • Deng Tonglin
  • REN JIALI
  • SU LEILEI
  • ZHANG YUANSHENG
  • Cao Shaodan

Assignees

  • 苏州昶智精密机械有限公司

Dates

Publication Date
20260512
Application Date
20260209

Claims (10)

  1. 1. The preparation process of the aluminum alloy composite material of the light new energy automobile radiator is characterized by comprising the following steps of: S1, preparing a core layer melt, wherein the core layer melt comprises aluminum, manganese, copper and zirconium; S2, introducing reaction salts into the core melt, generating TiB 2 nano reinforced particles through in-situ reaction, obtaining a core blank after casting and surface treatment, and preheating the core blank; S3, preparing a surface layer melt, wherein the surface layer melt comprises aluminum, zinc, magnesium, iron, silicon, scandium and zirconium; S4, atomizing the surface layer melt into a droplet stream, and injecting the surface hydrophobically modified iron particles into the droplet stream in an atomization area to enable the droplet stream loaded with the iron particles to be deposited on the surface of the core layer blank to form a composite blank; S5, heating and multi-pass hot rolling are carried out on the composite blank, and a metallurgical bonding interface is formed between the core layer blank and the deposition layer; s6, carrying out cold rolling deformation and finished product annealing on the hot rolled plate strip to obtain the aluminum alloy composite material.
  2. 2. The preparation process of the aluminum alloy composite material of the light-weight new energy automobile radiator is characterized in that the core layer melt comprises, by mass, 1.2% -1.8% of manganese, 0.5% -1.0% of copper, 0.1% -0.2% of zirconium, 0.05% -0.15% of titanium, 0.02% -0.06% of boron and the balance of aluminum and unavoidable impurities.
  3. 3. The preparation process of the aluminum alloy composite material of the light-weight new energy automobile radiator is characterized in that the surface layer melt comprises, by mass, 1.0% -3.5% of zinc, 0.2% -0.8% of magnesium, 0.15% -0.4% of iron, 0.1% -0.3% of silicon, 0.15% -0.35% of scandium, 0.1% -0.2% of zirconium and the balance of aluminum and unavoidable impurities.
  4. 4. The preparation process of the aluminum alloy composite material of the light-weight new energy automobile radiator, which is disclosed in claim 1, is characterized in that in the step S2, the specific method for generating TiB 2 nano reinforced particles by in-situ reaction is that the core layer melt is heated to 750-800 ℃, dried potassium fluotitanate and potassium fluoborate are added, and electromagnetic stirring is applied while the addition is carried out; The frequency of the electromagnetic stirring is 15Hz-35Hz, the power is 5kW-15kW, and the duration reaction time is 15-30min.
  5. 5. The process for preparing the aluminum alloy composite material of the light-weight new energy automobile radiator, which is characterized in that the preheating is to preheat the surface-treated core blank to 300-450 ℃.
  6. 6. The process for preparing aluminum alloy composite material for lightweight new energy automobile radiator according to claim 1, wherein in the step S4, the particle size of the surface hydrophobically modified iron particles is 1 μm-10 μm, and the composite material is composed of a pure iron core and an organosilane coupling agent thin layer coated on the surface of the pure iron core; The injection process is that the iron particles are sent into a central low-pressure area of an atomization cone through a powder feeding device, and the particles are captured by utilizing the surface tension of liquid drops.
  7. 7. The process for preparing the aluminum alloy composite material of the lightweight new energy automobile radiator according to claim 1, wherein in the step S4, the process parameters of atomizing and depositing the surface layer melt include: the atomizing medium adopts high-purity nitrogen, the atomizing pressure is 0.8MPa-1.5MPa, the dew point temperature of the nitrogen is controlled below-60 ℃, and the oxygen content is controlled below 5 ppm; the pressure of the deposition chamber is kept between-0.05 MPa and-0.1 MPa; the speed of the liquid drop flow loaded with the iron particles striking the surface of the core layer blank is more than or equal to 150m/s; controlling the deposition thickness of the surface layer melt to be 3% -5% of the total thickness of the composite blank.
  8. 8. The process for preparing the aluminum alloy composite material of the lightweight new energy automobile radiator according to claim 1, wherein in the step S5, the multi-pass hot rolling adopts a variable-temperature rolling process, and specifically comprises the following steps: heating the composite blank to 400-500 ℃ and preserving heat for 2-6 hours; the initial pass is carried out at 480-500 ℃, and the first pass reduction rate is 15-25%; the subsequent pass is carried out by cooling to 400-420 ℃; the total deformation of the hot rolling is more than or equal to 80 percent, and the plate strip is subjected to laminar cooling after the hot rolling is finished, wherein the cooling speed is 15 ℃ per second to 30 ℃ per second.
  9. 9. The process for preparing the aluminum alloy composite material of the light-weight new energy automobile radiator according to claim 1, wherein in the step S6, the total deformation amount of the cold rolling deformation is 75% -90%; The finished product annealing method comprises the steps of feeding the cold-rolled sheet strip into an annealing furnace, wherein the annealing temperature is 280-350 ℃, and the heat preservation time is 1-10min, and the heating rate of the annealing heating stage in the range of 200-280 ℃ is not lower than 50 ℃ per second.
  10. 10. An aluminum alloy composite material characterized in that the aluminum alloy composite material is prepared by adopting the preparation process of the aluminum alloy composite material of the light-weight new energy automobile radiator.

Description

Aluminum alloy composite material of light new energy automobile radiator and preparation process thereof Technical Field The invention relates to the technical field of aluminum alloy casting, in particular to an aluminum alloy composite material of a lightweight new energy automobile radiator and a preparation process thereof. Background The new energy automobile radiator is used as a core component of the thermal management system and is important to ensure safe and stable operation of the battery, the motor and the electric control system under the high-power working condition. Along with the continuous pursuit of the whole vehicle on light weight and energy efficiency, the radiator material needs to maintain or even improve the structural strength and the heat conducting property while reducing the weight. Aluminum alloys are widely used in heat sink manufacturing due to their good thermal conductivity, formability, and lower density. However, in the pursuit of extremely light weight, the prior art faces two outstanding technical challenges: Firstly, the reduction of the thickness of the material for weight reduction is generally accompanied by the reduction of the overall structural strength, which leads to the risk of deformation, cracking or early fatigue failure of the radiator under the high heat load generated by rapid charging and under the high-frequency vibration environment during the running of the vehicle; Secondly, a microscopic oxide film, an air gap or a non-complete metallurgical bonding area is often arranged between the core layer and the anticorrosive layer in the traditional multilayer composite structure (such as a rolled composite plate), and the interface defects can introduce obvious additional thermal resistance to weaken the efficient transfer of heat from a heat source to a cooling medium, so that the exertion of the high heat conducting property of the material is limited. Therefore, it is necessary to provide an aluminum alloy composite material for a lightweight new energy automobile radiator and a preparation process thereof, so as to solve the above problems. Disclosure of Invention The invention overcomes the defects of the prior art and provides an aluminum alloy composite material for a lightweight new energy automobile radiator and a preparation process thereof. In order to achieve the purpose, the technical scheme adopted by the invention is that the preparation process of the aluminum alloy composite material of the light-weight new energy automobile radiator comprises the following steps of: S1, preparing a core layer melt, wherein the core layer melt comprises aluminum, manganese, copper and zirconium; S2, introducing reaction salts into the core melt, generating TiB 2 nano reinforced particles through in-situ reaction, obtaining a core blank after casting and surface treatment, and preheating the core blank; S3, preparing a surface layer melt, wherein the surface layer melt comprises aluminum, zinc, magnesium, iron, silicon, scandium and zirconium; S4, atomizing the surface layer melt into a droplet stream, and injecting the surface hydrophobically modified iron particles into the droplet stream in an atomization area to enable the droplet stream loaded with the iron particles to be deposited on the surface of the core layer blank to form a composite blank; S5, heating and multi-pass hot rolling are carried out on the composite blank, and a metallurgical bonding interface is formed between the core layer blank and the deposition layer; s6, carrying out cold rolling deformation and finished product annealing on the hot rolled plate strip to obtain the aluminum alloy composite material. In a preferred embodiment of the invention, the core layer melt comprises, by mass, 1.2% -1.8% of manganese, 0.5% -1.0% of copper, 0.1% -0.2% of zirconium, 0.05% -0.15% of titanium, 0.02% -0.06% of boron, and the balance of aluminum and unavoidable impurities. In a preferred embodiment of the invention, the surface layer melt comprises, by mass, 1.0% -3.5% of zinc, 0.2% -0.8% of magnesium, 0.15% -0.4% of iron, 0.1% -0.3% of silicon, 0.15% -0.35% of scandium, 0.1% -0.2% of zirconium, and the balance of aluminum and unavoidable impurities. In a preferred embodiment of the present invention, in the step S2, the specific method for generating the TiB 2 nano-reinforced particles by in-situ reaction is that the core layer melt is heated to 750 ℃ to 800 ℃, and the dried potassium fluotitanate and potassium fluoborate are added, and electromagnetic stirring is applied while the addition is performed; The frequency of the electromagnetic stirring is 15Hz-35Hz, the power is 5kW-15kW, and the duration reaction time is 15-30min. In a preferred embodiment of the present invention, the preheating is to preheat the surface-treated core blank to 300-450 ℃. In a preferred embodiment of the present invention, in the step S4, the particle size of the surface hydrophobically modified iron particles is