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A kind of high-density, controllable composition of high-silicon aluminum alloy material and preparation method

A high-silicon aluminum alloy and dense technology, applied in the field of alloy processing, can solve the problems of reducing strength, plasticity and wear resistance, deteriorating cutting performance, and difficult to form metallurgical bonding, etc., to improve strength and elastic modulus, improve The final density and the effect of increasing the bulk density

Active Publication Date: 2022-08-02
HARBIN INST OF TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Several commonly used processes for preparing high-silicon aluminum alloy materials have the following problems: (1) The preparation of high-silicon aluminum alloy materials by smelting and casting will cause coarse plate-like primary silicon and needle-like eutectics in the structure Silicon, severely split the matrix, and stress concentration will occur at the tip, which reduces the strength, plasticity and wear resistance, and deteriorates the cutting performance; (2) the silicon phase in the material structure prepared by the spray deposition method is refined, but the alloy A large number of holes appear in the Si preform, and the density is low; (3) Although the pressure infiltration method can improve the density of the material, it is difficult to prepare the Si preform, and cracks are prone to appear under high pressure.
However, in the traditional single-solid-phase hot-pressing sintering process, the high-content Si phase hinders the diffusion of the AlMgSi10 matrix material, making it difficult to form a metallurgical bond; in the single-liquid-phase sintering process, the low-melting point liquid phase is easy to extrude during the pressurization process, making it difficult to accurately control the composition.

Method used

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  • A kind of high-density, controllable composition of high-silicon aluminum alloy material and preparation method
  • A kind of high-density, controllable composition of high-silicon aluminum alloy material and preparation method

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preparation example Construction

[0023] A preparation method of a high-density, controllable high-silicon aluminum alloy material, comprising the following steps: comprising the following steps: 10 AlMgSi was prepared by multi-stage hot pressing sintering after mixing alloy powder and silicon powder X Alloys where X is greater than 10.

[0024] In some embodiments of the present invention, a method for preparing a high-density, composition-controllable high-silicon aluminum alloy material includes the following steps:

[0025] AlMgSi 10 Alloy powder and silicon powder are mixed in proportion to obtain mixed powder;

[0026] The mixed powder is subjected to multi-stage hot-pressing sintering: the parameters of the multi-stage hot-pressing sintering are: the first stage: sintering at 350° C. and 0 MPa for 30 minutes; the second stage: sintering at 580° C. and 25 MPa for 30 minutes; The third stage: sintering at 10°C higher than the liquidus temperature and 0MPa for no more than 30min; the fourth stage: sinte...

Embodiment 1

[0039] AlMgSi10 alloy powder is used as the matrix, and Si powder is added. The mixed powder is uniformly mixed by planetary ball milling. The mass fraction of Si in the designed alloy is 20wt.%, and a multi-stage hot pressing sintering process is adopted; the parameters of the multi-stage hot pressing sintering are: The first stage: sintering at 350℃ and 0MPa for 30min; the second stage: sintering at 580℃ and 25MPa for 30min; the third stage: sintering at 10℃ above the liquidus temperature and 0MPa for no more than 30min; the fourth stage : Sintering at 580℃ and 25MPa for 30min. AlMgSi20 alloy was obtained, the density of the alloy was as high as 99.86%, the compressive strength was 270.9MPa, the elastic modulus was 88.33GPa, and the thermal expansion coefficient was 17.2×10 -6 K -1 , the thermal conductivity is 186.4W / (m×K).

[0040] figure 2 It is the corresponding scan image of Example 1. It can be observed from the figure that the primary crystal silicon grains are s...

Embodiment 2

[0042] combined with figure 1 , using AlMgSi10 alloy powder as the matrix, plus Si powder, the mixed powder is mixed evenly by planetary ball milling, the mass fraction of Si in the design alloy is 30wt. figure 1 shown); to obtain AlMgSi30 alloy, the density of the alloy is 98.06%, the compressive strength is 227.8MPa, the elastic modulus is 95.83GPa, and the thermal expansion coefficient is 14.9×10 -6 K -1 , the thermal conductivity is 152.3W / (m×K).

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Abstract

The invention belongs to the technical field of alloy processing and discloses a high-silicon aluminum alloy material with high density and controllable composition and a preparation method. Wherein, the preparation method includes the following steps: 10 AlMgSi was prepared by multi-stage hot pressing sintering after mixing alloy powder and silicon powder X Alloys where X is greater than 10. The high silicon aluminum alloy material of the present invention has higher strength, elastic modulus and density.

Description

technical field [0001] The invention relates to the technical field of alloy processing, in particular to a high-density, controllable high-silicon aluminum alloy material and a preparation method. Background technique [0002] High-silicon aluminum alloy materials have many outstanding advantages such as low thermal expansion coefficient, good thermal conductivity, high hardness, high specific strength, good wear resistance, and small specific gravity. They are widely used in automobile, electronics, aviation, aerospace and other fields, especially in It has wide application potential in fields such as electronic packaging materials and automotive engine piston materials. At present, several commonly used processes for preparing high-silicon aluminum alloy materials have the following problems: (1) The preparation of high-silicon aluminum alloy materials by smelting and casting will produce coarse plate-like primary silicon and needle-like eutectic in the structure. Silico...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/04C22C21/02B22F3/14C22C28/00
Inventor 黄陆军张财伟安琦陈润王存玉胡昌宇王帅耿林张宏伟
Owner HARBIN INST OF TECH
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