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Pretreatment method of silicon carbide particles and preparation method of aluminum matrix composite material

A technology of aluminum-based composite materials and silicon carbide particles, which is applied in the direction of silicon carbide and carbide, can solve the problems of wettability between silicon carbide particles and aluminum powder, high production cost, agglomeration, etc., and achieve improved wetting Sex and interface bonding strength, reducing interface detachment, and enhancing the effect of connection performance

Active Publication Date: 2022-04-26
HUNAN JINTIAN ALUMINUM HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method is only suitable for aluminum matrix composites with a silicon carbide particle content of less than 30%. With the increase of silicon carbide particle content in aluminum matrix composites, agglomeration and uneven particle distribution are still prone to occur.
Surface coating is to coat Ni or Cu and other metal layers on the surface of silicon carbide particles by physical or chemical methods to achieve the purpose of improving the wettability between silicon carbide particles and aluminum liquid, but this method has high production costs and is difficult to obtain large-scale industrial application of
Pickling, alkaline cleaning, ultrasonic cleaning and other methods can only remove impurities, organic matter and moisture adsorbed on the surface of silicon carbide particles to obtain relatively pure silicon carbide particles, but cannot solve the wettability problem between silicon carbide particles and aluminum powder

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0029] A method for preparing an aluminum-based composite material in an embodiment includes the following steps S110-S170:

[0030] S110, providing silicon carbide particles.

[0031] It should be noted that the above-mentioned silicon carbide particles are commonly used silicon carbide particles on the market.

[0032] Further, the particle size of the silicon carbide particles is 10 μm˜20 μm.

[0033] By selecting silicon carbide particles with a particle size of 10 μm to 20 μm, it is beneficial to its uniform dispersion in the subsequent aluminum alloy raw material powder, and can reduce the difficulty of deformation during press molding.

[0034] S120, removing impurities from the surface of the silicon carbide particles to obtain silicon carbide particles after removal of impurities.

[0035] In this embodiment, the step of removing impurities on the surface of the above-mentioned silicon carbide particles is specifically: after the above-mentioned silicon carbide part...

Embodiment 1

[0062] (1) Adopt SiC particles commonly used in the market, the size of the particles is 10 μm to 20 μm, use 1mol / L NaOH aqueous solution to wash for 30 minutes, then use 20wt% hydrochloric acid solution to wash for 30 minutes, and finally use pure water to wash, and then Bake in an oven at 180° C. for 60 minutes to obtain silicon carbide particles after impurity removal.

[0063] (2) Calcinate the removed SiC particles at 1500°C for 60 minutes to obtain a certain thickness of oxide layer on the surface of SiC particles, and then immerse them in 3mol / L NH 4 Soak in F aqueous solution for 120 minutes, then wash with clean water, and bake in an oven at 180°C for 60 minutes to obtain pretreated silicon carbide particles.

[0064] (3) 5g aluminum-magnesium master alloy powder (50wt% mass fraction), 4g aluminum-copper master alloy powder (50wt% mass fraction), 1g aluminum-zirconium master alloy powder (50wt% mass fraction), 1g aluminum-yttrium master alloy powder ( 50wt% mass frac...

Embodiment 2

[0069] Embodiment 2 is basically the same as Embodiment 1, the difference is that Step (1) is omitted in Embodiment 2.

[0070] After testing, the tensile strength of the aluminum-based composite material prepared in Example 2 is 201 MPa, and the coefficient of linear expansion at 25° C. to 300° C. is 10.

[0071] Through the comparison of Example 1 and Example 2, it can be seen that the SiC particles of the aluminum-based composite material obtained by the preparation method of the present application are uniformly dispersed and the interface is well bonded, but the tensile strength of the aluminum-based composite material is slightly lower due to the presence of impurities on the surface of the SiC particles. There is a reduction.

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Abstract

This application relates to the pretreatment method of silicon carbide particles and the preparation method of aluminum-based composite materials. A silicon dioxide layer is formed on the surface of silicon carbide particles, and then etched to make surface holes. On the one hand, the silicon dioxide layer can be combined with The alloying elements in the aluminum alloy raw material powder act to form interface products, which improve the wettability and interface bonding strength between silicon carbide particles and aluminum alloy raw material powder. On the other hand, the surface holes make the gap between the aluminum alloy raw material powder and silicon carbide particles Physical riveting can also be used to further enhance the connection performance and reduce the phenomenon of interface detachment due to differences in expansion coefficients. Therefore, the mass content of silicon carbide particles in the aluminum-based composite material can reach 50% to 70%.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a pretreatment method of silicon carbide particles and a preparation method of aluminum-based composite materials. Background technique [0002] Silicon carbide particles have excellent properties such as high modulus, high wear resistance, high strength, low density and high temperature resistance, while aluminum-based materials (here mainly refers to aluminum or aluminum alloy) have the advantages of light weight and good thermal conductivity. Combining silicon carbide particles with aluminum-based materials can greatly improve the comprehensive performance of aluminum-based materials, and the higher the content, the more significant the strengthening effect will be. However, as the content of silicon carbide particles increases, the relationship between silicon carbide particles and aluminum powder will inevitably Poor interwettability, uneven distribution of SiC p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C1/05C22C29/06C01B32/956
CPCC22C1/051C22C29/065C22C29/067C01B32/956
Inventor 刘春轩高平平蒋兆汝曹柳絮张扬戴青松罗任苏新吴云蒋小汉
Owner HUNAN JINTIAN ALUMINUM HI TECH CO LTD