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Si3N4 foam ceramic reinforced aluminum-based composite material and preparation method and application thereof

A technology of foam ceramics and reinforced aluminum base, which is applied in the field of composite materials, can solve the problems of high brittleness of ceramic materials, wear of composite materials, and affecting normal use, etc., and achieve the effect of improving bonding force, improving toughness, integrity and consistency

Active Publication Date: 2018-10-26
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, related studies have shown that under the continuous erosion and wear of the slurry, the reinforcement particles or fibers in the composite matrix will be continuously exposed due to the wear of the surrounding matrix, and will be separated from the matrix under the impact of the particles in the slurry. Debonding, eventually causing severe wear of the composite
Although the method of adding ceramic bushings inside the pipeline can greatly improve the erosion and wear resistance of the pipeline, due to the high brittleness of the ceramic material, it is prone to cracking or even catastrophic damage when it is impacted by the particles in the slurry , thus affecting its normal use

Method used

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  • Si3N4 foam ceramic reinforced aluminum-based composite material and preparation method and application thereof
  • Si3N4 foam ceramic reinforced aluminum-based composite material and preparation method and application thereof
  • Si3N4 foam ceramic reinforced aluminum-based composite material and preparation method and application thereof

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Effect test

Embodiment 1

[0041] A kind of Si of the present invention 3 N 4 Ceramic foam reinforced aluminum matrix composites, including aluminum matrix and Si 3 N 4 ceramic foam, the Si 3 N 4 Foamed ceramics include Si 3 N 4 Foam ceramic framework and in situ growth on Si 3 N 4 Columnar β-Si on the framework pore wall of ceramic foam 3 N 4 Grain, aluminum matrix uniformly filled in Si 3 N 4 In the pores of the ceramic foam framework, columnar β-Si 3 N 4 The grains are surrounded by an aluminum matrix.

[0042] In this example, the aluminum matrix is ​​in the Si 3 N 4 The volume percentage in the ceramic foam reinforced aluminum matrix composite material is 73.0%.

[0043] In this example, columnar β-Si 3 N 4 The column length of crystal grains is 1-3 μm, and the column diameter is 100-300 nm.

[0044] In this example, Si 3 N 4 The open porosity of the foamed ceramic skeleton is 73.0%, and the pore diameter is 100-300nm.

[0045] A kind of Si of above-mentioned present embodimen...

Embodiment 2

[0066] A kind of Si of the present invention 3 N 4 Ceramic foam reinforced aluminum matrix composites, including aluminum matrix and Si 3 N 4 ceramic foam, the Si 3 N 4 Foamed ceramics include Si 3 N 4 Foam ceramic framework and in situ growth on Si 3 N 4 Columnar β-Si on the framework pore wall of ceramic foam 3 N 4 Grain, aluminum matrix uniformly filled in Si 3 N 4 In the pores of the ceramic foam framework, columnar β-Si 3 N 4 The grains are surrounded by an aluminum matrix.

[0067] In this example, the aluminum matrix is ​​in the Si 3 N 4 The volume percentage in the foam ceramic reinforced aluminum matrix composite material is 62.0%.

[0068] In this example, columnar β-Si 3 N 4 The column length of crystal grains is 1-5 μm, and the column diameter is 100-300 nm.

[0069] In this example, Si 3 N 4 The open porosity of the foamed ceramic skeleton is 62.0%, and the pore diameter is 100-250 μm.

[0070] A kind of Si of above-mentioned present embodime...

Embodiment 3

[0090] A kind of Si of the present invention 3 N 4 Ceramic foam reinforced aluminum matrix composites, including aluminum matrix and Si 3 N 4 ceramic foam, the Si 3 N 4 Foamed ceramics include Si 3 N 4 Foam ceramic framework and in situ growth on Si 3 N 4 Columnar β-Si on the framework pore wall of ceramic foam 3 N 4 Grain, aluminum matrix uniformly filled in Si 3 N 4 In the pores of the ceramic foam framework, columnar β-Si 3 N 4 The grains are surrounded by an aluminum matrix.

[0091] In this example, the aluminum matrix is ​​in the Si 3 N 4 The volume percentage in the foamed ceramic reinforced aluminum matrix composite is 49.7%.

[0092] In this example, columnar β-Si 3 N 4 The column length of the crystal grains is 1-3 μm, and the column diameter is 50-400 nm.

[0093] In this example, Si 3 N 4 The open porosity of the foamed ceramic skeleton is 49.7%, and the pore diameter is 50-250 μm.

[0094] A kind of Si of above-mentioned present embodiment 3...

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Abstract

The invention discloses a Si3N4 foam ceramic reinforced aluminum-based composite material and a preparation method and an application thereof. The composite material comprises an aluminum matrix and Si3N4 foam ceramic; and the Si3N4 foam ceramic comprises a Si3N4 foam ceramic skeleton and columnar beta Si3N4 crystal grains which grow on the hole wall of the Si3N4 foam ceramic skeleton in situ, thealuminum matrix uniformly fills pores of the Si3N4 foam ceramic skeleton, and the columnar beta Si3N4 crystal grains are coated with the aluminum matrix. The preparation method of the composite material comprises the following steps that liquid metal aluminum is pressed into the pores of the Si3N4 foam ceramic skeleton by adopting a vacuum air pressure infiltration process so as to obtain the Si3N4 foam ceramic reinforced aluminum-based composite material. The Si3N4 foam ceramic reinforced aluminum-based composite material has the advantages of being good in toughness and erosion resistance,good in mechanical processing performance and the like. The preparation method is simple in process and suitable for batch production.

Description

technical field [0001] The invention belongs to the technical field of composite materials, in particular to a Si 3 N 4 Foam ceramic reinforced aluminum matrix composite material and its preparation method and application. Background technique [0002] Erosion wear is a form of dynamic wear, which is caused by the movement of fluid rich in hard particles relative to the solid surface, so that the solid surface is continuously subjected to the collision and impact of hard particles. This form of wear exists in various slurry conveying pipelines, such as concrete conveying pipelines in the construction industry, coal conveying pipelines in the coal mining industry, and sand pumping pipelines working underwater. In addition, the external components of aircraft and high-speed trains working in windy and sandy environments also show similar wear mechanisms due to the impact of tiny sand particles. In order to improve the erosion and wear resistance of pipelines, the common tec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/10C22C21/00C04B38/10C04B35/584C04B35/626C04B35/622
CPCC22C1/1015C22C1/1036C22C21/00C04B35/584C04B35/622C04B35/62615C04B35/6264C04B38/10C22C1/1021C22C1/1073
Inventor 周新贵殷刘彦王洪磊余金山李明远黎畅
Owner NAT UNIV OF DEFENSE TECH
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