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

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...

Examples

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...

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...

Examples

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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