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A high thermal conductivity high strength aluminum matrix composite material for die casting and its preparation method

An aluminum-based composite material and high-strength technology, which is applied in the field of metal-based composite materials, can solve problems such as poor thermal conductivity and difficulty in satisfying rapid heat dissipation of components, so as to improve thermal conductivity and strength, expand industrialization, and have a wide range of sources Effect

Active Publication Date: 2022-03-29
ZHUHAI RUNXINGTAI ELECTRICAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the thermal conductivity of these alloys is poor, and the thermal conductivity is usually lower than 145W / (m K). Among them, the thermal conductivity of the A356 alloy is only about 120W / (m K), and the thermal conductivity of the ADC12 alloy is only about 90W / (m ·K)
[0003] With the advent of the 5G era, related communication products are developing towards miniaturization, miniaturization, thin-walled and integrated, and the operating power density and calorific value of equipment are getting higher and higher. How to effectively dissipate heat in a limited space has become a relevant The key issue of product design, the traditional Al-Si cast aluminum alloy is difficult to meet the functional requirements of rapid heat dissipation of components

Method used

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  • A high thermal conductivity high strength aluminum matrix composite material for die casting and its preparation method
  • A high thermal conductivity high strength aluminum matrix composite material for die casting and its preparation method
  • A high thermal conductivity high strength aluminum matrix composite material for die casting and its preparation method

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preparation example Construction

[0049] The preparation method of the high thermal conductivity and high strength aluminum matrix composite material for die casting of the present invention specifically comprises the following steps:

[0050] S1) Weighing and drying raw materials: Weighing the aluminum alloy matrix and reinforcing particles according to the composition content, and placing the reinforcing particle mixture in a drying oven to dry;

[0051] S2) Melting: putting the preheated aluminum alloy substrate into a melting furnace for heating and melting to obtain a melting melt;

[0052] S3) Refining: After the smelting melt is completely melted, adding a refining agent and / or an inert gas to the smelting melt for refining to obtain a refining melt;

[0053] S4) Preparation of aluminum-based composite material melt: adding the dried reinforcing particles into the refining melt obtained in step S3) and stirring, removing surface slag inclusions to obtain an aluminum-based composite material melt;

[00...

Embodiment 1

[0061] The specific composition and mass fraction of the aluminum alloy matrix are: Si 4.0%, Fe 0.30%, Mg 0.10%, Cu0.10%, Sr 0.02%, La 0.10%, and the rest are Al and unavoidable impurities, among which unavoidable impurities The total mass fraction of elements is 0.05%; the reinforcing particles are SiC particles with an average particle size of 5 μm and a purity of 99.5% and AlB with an average particle size of 1 μm and a purity of 99%. 2 particles, among which SiC particles and AlB 2 The volume fractions of particles are 1% and 0.1%, respectively;

[0062] The preparation method of the aluminum matrix composite material with high thermal conductivity and high strength for die casting, the method specifically includes the following steps:

[0063] S1) Weigh and dry the raw materials: Weigh the pure Al and Al-12Si ingots, Al-10Fe and Al-5Sr master alloys, SiC particles and AlB required for the above-mentioned aluminum matrix composite materials according to the composition co...

Embodiment 2

[0070] The specific composition and mass fraction of the aluminum alloy matrix are: Si 10.0%, Fe 0.80%, Mg 0.80%, Cu 0.50%, Sr 0.12%, Ce 0.40%, and the rest are Al and unavoidable impurities. Among them, unavoidable impurities The total mass fraction of elements is 0.20%; the reinforcing particles are SiC particles with an average particle size of 25 μm and a purity of 99.5% and AlB particles with an average particle size of 20 μm and a purity of 99%. 2 particles, among which SiC particles and AlB 2 The volume fractions of particles are 5% and 0.5%, respectively;

[0071] The preparation method of the aluminum matrix composite material with high thermal conductivity and high strength for die casting, the method specifically includes the following steps:

[0072] S1) Weigh and dry raw materials: Weigh the pure Al and Al-12Si ingots, Al-10Fe and Al-5Sr master alloys, SiC particles and AlB2 particles required for the above-mentioned aluminum-based composite materials according t...

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Abstract

The invention relates to the technical field of metal matrix composite materials, in particular to an aluminum matrix composite material with high thermal conductivity and high strength for die casting and a preparation method thereof. The aluminum-based composite material is formed by adding reinforcing particles to the aluminum alloy matrix, and the content of each component in the aluminum alloy matrix is ​​expressed in weight percentage as follows: Si 2-12%, Fe 0.1-1.5%, Mg≤1.2%, Cu≤0.6%, Sr≤0.2%, RE≤0.8%, the rest is Al and unavoidable impurities, the reinforcing particles are SiC and AlB 2 mixture. The present invention introduces SiC and AlB into the Al-Si alloy 2 Mixed particles, using the high thermal conductivity of SiC particles and AlB 2 The purification effect of particles and the synergistic effect of mixed particles can reduce the solid solution of unavoidable impurity elements and the degree of lattice distortion on the basis of strengthening the strength and thermal conductivity of the aluminum alloy matrix, thereby improving the thermal conductivity, strength and plasticity of the alloy at the same time.

Description

technical field [0001] The invention relates to the technical field of metal matrix composite materials, in particular to an aluminum matrix composite material with high thermal conductivity and high strength for die casting and a preparation method thereof. Background technique [0002] The crystallization temperature interval of Al-Si series alloy is small, and its Si phase has large solidification latent heat and specific heat capacity. The alloy's wire shrinkage coefficient, thermal cracking and shrinkage tendency are small, which makes the casting performance of this alloy better than other aluminum alloys. In addition, Al-Si alloys have the advantages of low density, good strength and toughness, and corrosion resistance. These advantages make this alloy the most widely used casting alloy at present, and are widely used in communications, home appliances, machinery, electronics, automobiles, etc. field. At present, the most commonly used casting Al-Si alloys mainly inc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/04C22C32/00C22C1/10C22C1/02C22F1/043B22D17/00C22C1/06
CPCC22C21/04C22C32/0047C22C1/1036C22F1/043B22D17/007C22C1/06C22C1/1047
Inventor 任怀德祁明凡王继成康永林张莹邓蒨瑜
Owner ZHUHAI RUNXINGTAI ELECTRICAL
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