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Pretreatment method of silicon carbide particles and preparation method of aluminum-based composite material

An aluminum-based composite material, silicon carbide particle technology, applied in the direction of silicon carbide, carbide, etc., can solve the problems of the wettability of silicon carbide particles and aluminum powder, uneven particle distribution, and high production costs. Wettability and interfacial bonding strength, simple preparation method, and the effect of reducing interfacial detachment

Active Publication Date: 2021-10-15
湖南湘投轻材科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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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

The invention relates to a pretreatment method of silicon carbide particles and a preparation method of an aluminum-based composite material. Silicon dioxide layers are formed on the surfaces of the silicon carbide particles and then etched to manufacture surface holes, on one hand, the silicon dioxide layers can act with alloy elements in aluminum alloy raw material powder to form interface products, thereby improving the wettability and interface bonding strength between the silicon carbide particles and the aluminum alloy raw material powder; and on the other hand, the surface holes enable the connection performance between the aluminum alloy raw material powder and the silicon carbide particles to be further enhanced through a physical riveting effect, and the phenomenon of interface separation caused by the difference of expansion coefficients is reduced, so that the mass content of the silicon carbide particles in the aluminum-based composite material can reach 50-70%.

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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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 湖南湘投轻材科技股份有限公司