Preparation method of laser sintered porous graphene-reinforced titanium-based nanocomposites

Abstract

Provided is a method based on a laser sintering technique for preparing a porous graphene-reinforced titanium-based nanocomposite material, comprising the following steps: (1) powder mixing: jointly placing titanium hydride, titanium powder, and graphene powder according to a certain ratio into a ball milling tank for argon protection and intermittent ball milling and material mixing, and mixing evenly to produce a composite powder; and (2) laser dot-matrix or linear-array sintering: sintering the composite powder in step (1) by using a laser dot-matrix or linear-array multi-layer sintering technique, thus allowing the titanium hydride to be dehydrogenated and sintered into one with titanium and graphene, where the hydrogen dissolved from the titanium hydride powder provides a pore-forming effect during a laser sintering rapid melting / condensing process, and the laser forms macroscopic pores of the sintered material in either a dot matrix or a linear array, thus preparing blocks of the porous graphene-reinforced titanium-based nanocomposite material. The method prevents a reaction between titanium and graphene and ensures that the nanocomposite material so prepared has great performance.

Description

technical field [0001] The invention relates to the technical field of preparation of new materials, in particular to a method for preparing a laser-sintered porous graphene-reinforced titanium-based nanocomposite material. Background technique [0002] Porous titanium is widely used in biomedicine, food, chemical industry and other fields. [0003] Graphene is a two-dimensional material formed by a single layer of carbon atoms arranged in a honeycomb structure. It has excellent mechanical properties, and also has excellent electrical and thermophysical properties such as low thermal expansion coefficient, high electrical conductivity, and high thermal conductivity. Therefore, graphene is a potential reinforcing phase of metal matrix nanocomposites. It can be expected that porous materials prepared with graphene-enhanced titanium nanocomposites will have better comprehensive properties. [0004] At present, there is no good method to prepare porous graphene-reinforced tita...

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Problems solved by technology

[0004] At present, there is no better method to prepare porous graphene-reinforced titanium-based nanocomposites, mainly because titanium is a relatively active metal, which is easy to react with elements such as carbon, oxygen, nitrogen, etc., making it difficult to prepare nanocomposites with excellent performance. Thus restricting the development of corresponding porous materials

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