Preparation method of graphene surface cobalt plating reinforced cobalt-based alloy composite powder for selective laser melting forming

Abstract

The invention relates to the technical field of metal-based composite materials, and particularly discloses a preparation method of graphene surface cobalt plating reinforced cobalt-based alloy composite powder for selective laser melting forming. According to the method, cobalt metal is uniformly loaded on the surface of graphene and the interlayer surface through an efficient, simple and convenient hydrothermal reduction method so as to improve the interface bonding condition with a matrix; the dispersity and wettability of the graphene are improved; the obtained cobalt-plated graphene serves as a reinforcing component and is mechanically ball-milled with a cobalt-based alloy; the cobalt-plated graphene and the cobalt-based alloy powder are mixed uniformly; a sample of the cobalt-plated graphene / cobalt-based composite material is printed through selective laser melting forming; then, the surface of a sample is subjected to grinding, polishing and erosion treatment and then cleaned up; and the outer surface of the erosion position is observed through a metallographic microscope. According to the method, the interface bonding strength of the graphene and the matrix can be improved, the dispersity and wettability of the graphene are improved, and the graphene reinforced cobalt-based alloy composite material with excellent performance is obtained.

Description

Technical field [0001] The present invention relates to the field of metal matrix composites, and in particular, to a preparation method of graphene-plated cobalt-plated cobalt-based alloy composite powder for selection laser melting formation. Background technique [0002] In recent years, cobalt chrome alloys have been widely used in surgical implants, dental materials, joint prosthesis, and the like for surgical implants, dental materials, joint prosthesis, etc. in medical field due to their excellent wear resistance, corrosion resistance and good biocompatibility. Performance Single cobalt chromium alloy materials have not met the requirements of higher performance materials, so the preparation and application of higher comprehensive performance of cobalt-based composites is particularly important. [0003] Graphite has excellent conductivity and mechanical properties, due to its unique two-dimensional layer structure, there is a large specific surface area, and can be better...

AI Technical Summary

Problems solved by technology

Adding graphene to cobalt alloy as a reinforcement can effectively improve the overall performance of cobalt alloy and obtain a material with dual properties of cobalt alloy and graphene, but graphene has poor wettability with the substrate, is easy to agglomerate, and has a large specific surface area. It has poor dispersion in the cobalt alloy matrix and is not tightly combined with the matrix. How to improve the interfacial bonding strength between graphene and the matrix, improve the dispersion and wettability of graphene, and become a graphene-reinforced composite material with excellent performance. key scientific questions

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