Method for preparing directionally-arranged SIC nanowire reinforced aluminum matrix composite material based on semi-solid extrusion

A technology of semi-solid extrusion and reinforcement of aluminum matrix, which is applied in the field of preparing oriented SiC nanowire reinforced aluminum matrix composite material based on semi-solid extrusion, can solve problems such as damage of SiC nanowire, and achieve excellent performance of composite material and process method. Simple, high-performance results

Active Publication Date: 2017-08-18
HARBIN INST OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of serious damage to SiC nanowires in the process of aligning SiC nanowires with conventional hot extrusion, and proposes a semi-solid extrusion-based preparation of aligned SiC nanowire-reinforced aluminum matrix composites Methods

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  • Method for preparing directionally-arranged SIC nanowire reinforced aluminum matrix composite material based on semi-solid extrusion

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specific Embodiment approach 1

[0022] Specific implementation mode 1: A method for preparing aligned SiC nanowire-reinforced aluminum-based composite materials based on semi-solid extrusion in this embodiment is carried out according to the following steps:

[0023] 1. Preparation of non-oriented SiC nanowire-reinforced aluminum matrix composites:

[0024] The non-oriented SiC nanowire-reinforced aluminum-based composite material is prepared by a solid-state method or a liquid-state method; the volume fraction of SiC nanowires in the non-oriented SiC nanowire-reinforced aluminum-based composite material is 5.0% to 35%, and the non-oriented SiC nanowire-reinforced aluminum matrix composite material is 5.0% to 35%. The volume fraction of aluminum-containing metal in the wire-reinforced aluminum matrix composite material is 65% to 95%; wherein the aluminum-containing metal is pure aluminum or aluminum alloy;

[0025] 2. Preheating of non-oriented SiC nanowire reinforced aluminum matrix composites and hot extru...

specific Embodiment approach 2

[0030] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the SiC nanowires in step 1 have a purity greater than 85%, an average diameter of 5 nm to 250 nm, and a length of 5 μm to 100 μm; the SiC nanowires are Any combination of one or more of 3C, 2H, 4H and 6H. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0031] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the aluminum alloy described in Step 1 is Al-Si alloy, Al-Cu alloy, Al-Mg alloy, Al-Si-Cu alloy , Al-Si-Mg alloy, Al-Cu-Mg alloy, Al-Zn-Cu alloy, Al-Zn-Mg-Cu alloy, Al-Be alloy, Al-Li alloy and Al-Si-Cu-Mg alloy One or any combination of several of them. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a method for preparing a directionally-arranged SIC nanowire reinforced aluminum matrix composite material based on semi-solid extrusion. The problem that by adopting conventional hot extrusion treatment, damage to SIC nanowires is serious in the directional arrangement process of the SIC nanowires is solved. The method comprises the steps that firstly, a non-directional SIC nanowire reinforced aluminum matrix composite material is prepared; secondly, the non-directional SIC nanowire reinforced aluminum matrix composite material and a hot extrusion die are preheated; and thirdly, the directionally-arranged SIC nanowire reinforced aluminum matrix composite material is prepared through semi-solid extrusion. According to the method, the SIC nanowire reinforced aluminum matrix composite material is subjected to hot extrusion treatment above a solid phase line and below a liquid phase line; the grain boundary of an aluminum matrix is melted, the aluminum matrix is located in the solid-liquid mixing state, constraining force to the SIC nanowires is small, and the SIC nanowires can achieve low-damage directional arrangement.

Description

technical field [0001] The invention relates to a method for preparing aligned SiC nanowire-reinforced aluminum-based composite materials based on semi-solid extrusion. Background technique [0002] In recent years, nano-phase reinforced metal matrix composites have become a research hotspot of metal matrix composites due to their excellent strengthening efficiency. At present, the main reinforcement of nanocomposites is zero-dimensional nanomaterials (such as Al 2 o 3 Nanoparticles), one-dimensional nanomaterials (such as carbon nanotubes, SiC nanowires), two-dimensional nanomaterials (such as graphene). At present, the preparation methods of nano-aluminum matrix composites mainly focus on solid-state methods (hot pressing sintering, spark plasma sintering, friction stir welding) and liquid methods (squeeze casting, stirring casting, air pressure infiltration, pressureless infiltration and spray deposition, etc.). In the past, the research on carbon nanotubes reinforced...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C49/06C22C49/14C22C47/00C22F1/04C22C101/14
CPCC22C47/00C22C49/06C22C49/14C22F1/04
Inventor 杨文澍武高辉姜龙涛张强修子扬陈国钦乔菁康鹏超芶华松
Owner HARBIN INST OF TECH
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