Graphene aluminum-based composite powder used for laser deposition manufacturing, and preparation method and application thereof

Abstract

Graphene aluminum-based composite powder used for laser deposition manufacturing, and a preparation method and application thereof belong to the field of metal-based composite materials. In the graphene aluminum-based composite powder used for laser deposition manufacturing, the mass ratio of a few layers of graphene nanosheets prepared by a thermal expansion-ultrasonic combined method to aluminummatrix powder equals to 1: (666-1999), and the sphericity is 0.85-0.9. The few layers of graphene nanosheets are prepared by the thermal expansion ultrasonic combined method, and wet ball-milling isadopted, so that the few layers of graphene nanosheets are uniformly dispersed on the surface of aluminum powder particles under a scanning electron microscope. The laser deposition process is adoptedfor forming, and a graphene aluminum-based composite workpiece has good interface bonding, strong compactness, no pore defects, and improved strength and toughness.

Description

technical field [0001] The invention relates to the field of metal-based composite materials, in particular to a graphene-aluminum-based composite powder used for laser deposition and its preparation method and application. Background technique [0002] Additive manufacturing, commonly known as 3D printing, can quickly produce various forms of structural organization. Additive manufacturing technology can manufacture any complex structure as long as there is a model, and it also eliminates the need for mechanical processing after forming, which significantly shortens the The product development cycle, which has the advantages of low manufacturing cost and short cycle, has become one of the most concerned technologies in the manufacturing industry. In addition to software, devices, etc., there are materials that affect the development of additive manufacturing technology. Materials are an important material basis for the development of additive manufacturing technology, and ...

AI Technical Summary

Problems solved by technology

However, there are still two problems to be solved as an additive manufacturing material: First, aluminum alloy is used as a structural material. Improving the strength of aluminum alloy is a hot issue in the research field, and the methods of regulating the main component, adjusting the heat treatment and process have not been broken. sexual progress

Second: For the relatively mature laser deposition manufacturing (Laser Deposition Manufacturing, LDM) technology in the additive manufacturing process, if the material is aluminum alloy, because the aluminum alloy has a low absorption rate of laser light, most of the laser light is reflected, so it is difficult to process very difficult

[0004] In the existing process, patent 201611033221.4 discloses a graphene-aluminum matrix composite material and its preparation method. The graphene-aluminum matrix composite material prepared by this method is used in traditional subtractive or equal-material manufacturing methods. This type of manufacturing method has Limitations, the complex structure is difficult to form, the forming quality is unstable, and the composite material prepared by it has many defects such as pores and cracks, so the compactness is poor, and the bonding between layers is poor, which directly leads to low performance parameters

The patent 201710496369.X discloses a method for preparing graphene-aluminum-based composite powder for selective laser melting forming. The prepared graphene-aluminum-based composite powder is used for selective laser melting in additive manufacturing technology. , Selective laser melting molding is the laser melting and molding at the required position of the model after powder coating on each layer, so each layer needs to waste some powder materials. However, for composite materials, the process of preparing composite powder is more complicated and the cost is higher. Therefore, the cost of selective laser melting molding is high, and the preparation cycle of the composite powder used for molding is long.

In addition, selective laser melting molding takes a long time to print a test piece. Compared with a test piece of the same size, the time is 3-5 times that of LDM.

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