Method for preparing graphene reinforced aluminum alloy based nano composite material by batch casting

Abstract

The invention discloses a method for preparing a graphene reinforced aluminum alloy based nano composite material by batch casting. The method comprises the following steps that aluminum alloy powderand graphene powder are evenly mixed to obtain composite powder; the composite powder is pressed into a preformed block; the preformed block is sintered to obtain a preformed settling block; the preformed settling block is divided into a plurality of settling block bodies with a certain mass; an aluminum ingot is heated and melted to obtain an aluminum alloy solution; the aluminum alloy solution is moved into a container, the settling block bodies are added into the aluminum alloy solution while stirring is carried out, and graphene in the settling block bodies is uniformly dispersed into thesemi-solid stirred alloy solution during the melting process; and the alloy solution is cast into a metal mold for cooling and solidification, and the grapheme reinforced aluminum alloy based nano composite material with the grapheme being uniformly dispersed is obtained. The method can solve the problem that the density of the graphene is small so that the graphene can be difficult to sink, improves the viscosity of a metal solution, reduces a chemical reaction generating between a base body and the graphene, and realizes batch production.

Description

technical field [0001] The invention relates to the technical field of new material preparation, in particular to a method for preparing graphene-reinforced aluminum alloy-based nanocomposites by batch melting and casting. Background technique [0002] With the rapid development of my country's aerospace and defense industries, the demand for aluminum-based materials with excellent comprehensive properties such as light weight, high strength, heat resistance, and corrosion resistance has become increasingly urgent. The development of aluminum matrix composites is one of the important solutions. [0003] Graphene-aluminum matrix composites have excellent comprehensive properties and are expected to become replacement materials for aerospace and weaponry. A lot of research has been carried out at home and abroad and great progress has been made. In order to meet the needs of my country's aerospace and defense industries for high-performance materials, research in this area i...

AI Technical Summary

Problems solved by technology

However, due to the difference in the type of graphene added and the substrate, it is inconvenient to make a horizontal comparison in terms of performance improvement

[0005] Generally speaking, the basic problems in the preparation of graphene-aluminum matrix composites are: the uniform dispersion of graphene in the matrix material and the interface reaction between graphene and aluminum matrix have not been well resolved, and they are unavoidable in this field. question

However, the disadvantages of the traditional casting method are: 1. The wettability of graphene and aluminum alloy melt is poor; 2. Graphene has a small specific gravity, and all of it floats to the surface of the aluminum alloy solution, and it cannot sink, and it is difficult to mix and evenly disperse; 3. At high temperature Graphene and aluminum alloy melt react chemically to form aluminum carbide

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