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Preparation process of high volume fraction silicon particle enhanced aluminum based composite material

A composite material and particle-reinforced technology, which is applied in the field of preparation of high-volume silicon particle-reinforced aluminum-based composite materials, can solve the problems of difficulty in controlling the particle size and morphology of composite material interfaces, poor mechanical properties and machinability of materials, and high Bulk Si/Al is not dense, etc., to achieve excellent comprehensive performance, improved fracture toughness, and strong controllability

Active Publication Date: 2011-07-06
有研金属复材技术有限公司
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AI Technical Summary

Problems solved by technology

[0004] High-volume silicon particle-reinforced composite materials are mainly prepared by liquid phase impregnation method (200410043855, 200510024032) and spray deposition method (200410039057). Although the liquid phase method can produce dense and uniform composite parts, due to the excessive particle size Large (50-150μm), resulting in poor mechanical properties and machining properties of the material; at the same time, because silicon can be solid-soluble in aluminum, it is difficult to control the particle size and morphology and the interface of the composite material in the liquid phase environment
However, the high-volume Si / Al prepared by spray deposition method is not dense, and large-size ingots cannot be produced

Method used

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  • Preparation process of high volume fraction silicon particle enhanced aluminum based composite material
  • Preparation process of high volume fraction silicon particle enhanced aluminum based composite material
  • Preparation process of high volume fraction silicon particle enhanced aluminum based composite material

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Embodiment 1

[0031] The composite material prepared in this embodiment is 70vol.% Si / Al (that is, the content of Si is 70vol.%; the content of 2024 alloy is 30vol.%); the preparation method adopts the following technical solutions: (1) The particle size is- The 325 mesh atomized aluminum alloy powder and the surface-treated silicon powder are uniformly mixed according to the mass ratio of 1:2.01. The aluminum alloy powder is 2024 alloy powder, and the aluminum powder is d 0.5 It is 23.647μm, that is, more than 50wt.% of the powder particle size is smaller than this size, the particle size of Si powder is 0.3-18μm, 0.5 It is 4.372μm. The surface treatment method of Si powder is to form a layer of SiO with a thickness of 10 nanometers to 50 nanometers on the surface of Si powder through high temperature oxidation. 2 Thin film, high temperature oxidation temperature is 750℃, average particle size of Si powder after treatment d 0.5 It is 4.397μm; (2) The mixed powder is put into a metal mold with ...

Embodiment 2

[0037] The composite material prepared in this embodiment is 50vol.% Si / Al (that is, the content of Si is 50vol.%; the content of 2024 alloy is 50vol.%). The preparation process flow chart is as figure 2 Shown; such as figure 2 As shown, the atomized aluminum alloy powder is mixed with the silicon powder after surface treatment. After the powder is uniformly mixed, the powder is packaged and cold isostatic pressing is performed, and then the high temperature degassing and hot isostatic pressing are densified to produce High-volume Si / Al particle reinforced composite material. The technical scheme is detailed as follows: (1) The prefabricated aluminum alloy powder and the surface-treated silicon powder are uniformly mixed in a mass ratio of 1:0.86. The aluminum alloy powder is 2024 alloy powder, which is atomized alloy aluminum with a particle size of -325 mesh. Powder, aluminum powder d 0.5 It is 23.647μm, that is, more than 50wt.% of the powder particle size is smaller than ...

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Abstract

The invention relates to a preparation process of a high volume fraction silicon particle enhanced aluminum based composite material, which is characterized by comprising the step of: preparing a completely-compacted Si / Al composite material large-size billet with Si granules of 50vol.percent to 80vol.percent and thin and uniform texture by using a flexible and practical powder metallurgy process. The prepared composite material has excellent combination property. The preparation process comprises the steps of: uniformly mixing prealloy aluminum powder with pure silicon powder in a mass ratio of 1:(0.86-2.1) to prepare composite powder; carrying out cold moulding on the composite powder, wherein a relative compactness of a cold moulding blank is 50-80 percent; compacting the cold moulding blank at a temperature slightly higher than the temperature of a matrix alloy solidus curve to prepare a completely-compacted billet; and processing a thermally-pressed billet into a stand column or billets with other shapes by adopting methods, such as turning, spark cutting and the like for preparing for transportation and performance tests or further machining.

Description

Technical field [0001] The invention relates to the technical field of particle-reinforced metal-based composite materials; in particular, it relates to a preparation process of a high volume fraction silicon particle-reinforced aluminum-based composite material. Background technique [0002] The particle-reinforced aluminum-based composite material has excellent comprehensive properties such as high specific strength, high specific stiffness, low expansion, high thermal conductivity, fatigue resistance, and isotropy, and the particle reinforcement has low cost, simple manufacturing process and low price. After 30 years of development, this type of material has been widely used in aerospace, automotive, and microelectronics fields, and is expected to become another new type of structural material after aluminum alloy and titanium alloy. The density of silicon (2.33g / cm 3 ) Is 14% lower than aluminum alloy, it has extremely low expansion coefficient, high thermal conductivity, hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/16B22F1/00
Inventor 刘彦强樊建中马自力左涛魏少华
Owner 有研金属复材技术有限公司
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