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SiC particle reinforced aluminum-based composite bar with size gradient and preparation method of SiC particle reinforced aluminum-based composite bar

A particle-reinforced aluminum and composite rod technology, which is used in manufacturing tools, heat treatment equipment, casting and molding equipment, etc., can solve the problems of reduced plasticity of the second layer material, inability to make large products, and poor secondary processing formability. The effect of improving wear resistance, not easy to agglomerate and improve strength

Pending Publication Date: 2022-04-12
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, this preparation method has the following disadvantages: the B prepared by powder metallurgy 4 C particle reinforced aluminum matrix composite material, the process is complex, the cost of raw materials and equipment is high, with the B 4 As the content of C particles increases, the plasticity of the second layer material will decrease and lead to poor secondary processing formability
During preparation B 4 C The particle size is quite different from the matrix particle size, which may easily cause uneven distribution of particles in the matrix
In addition, the shape and size of materials prepared by powder metallurgy will be limited to a certain extent, and large-scale products cannot be made.

Method used

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  • SiC particle reinforced aluminum-based composite bar with size gradient and preparation method of SiC particle reinforced aluminum-based composite bar

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preparation example Construction

[0032] The above-mentioned method for preparing the SiC particle-reinforced aluminum-based composite rod with a size gradient specifically includes the following steps:

[0033] (1): Firstly, industrial pure aluminum powder (99.7wt%), industrial pure silicon powder (99.9wt%) and graphite powder are configured into raw materials according to a certain ratio, which are fully mixed and put into a planetary ball mill for ball milling, The ball milling time is 1h±10min, and the speed is 350~400r / min. After ball milling, sinter in an argon protective atmosphere furnace, the sintering temperature is 600-800°C, and the time is 2h±30min. The sintered sample is hot-extruded into a rod with a diameter of 5-20 mm at a temperature of 300-400 ° C, and the protection of an inert gas is required during the process.

[0034] (2): Grinding the prepared bar to remove the oxide layer on the outer surface and then putting it into a mold groove with a cylindrical cavity.

[0035] (3): Industrial pu...

Embodiment 1

[0040] (1): Firstly, industrial pure aluminum powder, industrial pure silicon powder, and graphite powder are configured as raw materials according to a certain ratio, and they are fully mixed and ball milled for 1 hour at a speed of 350r / min. After the ball milling, it was sintered in an argon protective atmosphere furnace at a sintering temperature of 650°C for 2 hours. The sintered sample was hot-extruded into a rod with a diameter of 15 mm at a temperature of 300 ° C, and the extrusion ratio was 6;

[0041] (2): Grinding the prepared bar to remove the oxide layer on the outer surface and then putting it into the cylindrical groove at the bottom of the mold, the inner diameter of the mold is 60mm, the depth is 300mm, the groove diameter is 15mm, and the depth is 10mm;

[0042] (3): Melt industrial pure aluminum ingots at a temperature of 680°C to form molten aluminum, and add preheated micron-sized SiC particles into the aluminum solution for mechanical stirring. The stirr...

Embodiment 2

[0048] (1): Firstly, industrial pure aluminum powder, industrial pure silicon powder, and graphite powder are configured as raw materials according to a certain ratio, and they are fully mixed and ball milled for 1 hour at a speed of 350r / min. After ball milling, sinter in an argon protective atmosphere furnace at a sintering temperature of 600°C for 2 hours. The sintered sample was hot-extruded into a rod with a diameter of 8 mm at a temperature of 350 ° C, and the extrusion ratio was 6;

[0049] (2): Grinding the prepared bar to remove the oxide layer on the outer surface and then putting it into the cylindrical groove at the bottom of the mold. The inner diameter of the mold is 25mm, the depth is 280mm, the groove diameter is 8mm, and the depth is 10mm;

[0050] (3): Industrial pure aluminum ingots are melted at a temperature of 690° C. into molten aluminum, and preheated micron-sized SiC particles are added to the molten aluminum for mechanical stirring. The stirring temp...

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Abstract

The invention belongs to the field of high-temperature high-strength wear-resistant metal materials, and particularly relates to a SiC particle reinforced aluminum-based composite bar with size gradient and a preparation method of the SiC particle reinforced aluminum-based composite bar. Comprising the following steps: (1) preparing a submicron SiC particle reinforced aluminum-based composite material by adopting an in-situ synthesis method, carrying out hot extrusion on the submicron SiC particle reinforced aluminum-based composite material to form a bar with a required diameter, and putting the bar into a mold groove with a cylindrical cavity; (2) preheated SiC particles with the size of 2-3 microns are added into the molten aluminum to be mechanically stirred; (3) after stirring is completed, the mixture is poured into a mold, a cavity is filled with the mixture, a composite sample is obtained after air cooling to the room temperature, and then the composite sample is subjected to hot extrusion again to form a bar with the specified diameter; and (4) carrying out homogenizing annealing on the obtained sample. The SiC particle reinforced aluminum-based composite material with the size gradient structure is realized, the high-strength performance of the bar core part can be realized, the heat resistance and wear resistance of the bar surface layer can be realized, and meanwhile, certain plasticity and toughness are ensured, so that the comprehensive performance of the material is integrally optimized.

Description

technical field [0001] The invention belongs to the field of high-temperature, high-strength and wear-resistant metal materials, and in particular relates to a SiC particle-reinforced aluminum-based composite rod with a size gradient and a preparation method thereof. Background technique [0002] With the advancement of science and technology and the continuous development of industrial production, metal matrix composites have gradually replaced traditional metal materials, showing great potential in aerospace, military defense, mechanical transportation and other fields. Metal matrix composites are compounded by using metal as the matrix and one or more materials as reinforcements through various technological means, combining the performance advantages of the matrix and reinforcements. Aluminum has the characteristics of light weight, low density, and good plasticity. Therefore, aluminum matrix composites have become the most common metal matrix composites and are widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C1/02C22C21/00C22C32/00C22F1/04B22C9/22C21D9/00B21C23/02
CPCY02E30/30
Inventor 聂金凤江孟琦刘伟陈玉瑶赵永好李玉胜周浩
Owner NANJING UNIV OF SCI & TECH
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