A preparation method of argon arc welding graphene reinforced titanium-based composite coating

Abstract

The invention discloses a preparation method of an argon arc deposited graphene reinforced Ti-based composite coating, belonging to the technical field of material surface thermal treatment. The preparation method comprises the following steps: firstly, preparing mixed powder, precoating the mixed powder on the surface of titanium alloy, carrying out deposition treatment on the mixed powder and atitanium alloy matrix by utilizing a non-consumable electrode argon arc heat source, under the action of electric arc heat, enabling the mixed powder and the surface of the titanium alloy matrix to berapidly molten and forming a molten bath, and adjusting argon arc technological parameters, so that graphene and titanium powder react in situ in the titanium alloy matrix to synthesize a titanium carbide particle reinforced Ti-based composite coating, the composite coating and the matrix are metallurgically bonded, and reinforced phase particles are micron-nano sized and are uniformly distributed. Compared with the conventional titanium alloy surface reinforcement technologies such as laser deposition, plasma deposition and electric spark shock, argon arc graphene deposition has the characteristics of simple technology, low equipment price, simplicity of operation (manual operation or semimechanical operation), production cost reduction and the like.

Description

technical field [0001] The invention belongs to the technical field of metal surface heat treatment. In particular, it relates to a preparation method of argon arc welding graphene-reinforced titanium-based composite coating. Background technique [0002] Due to its high specific strength, high specific modulus, excellent corrosion resistance, good low temperature and high temperature performance, and good biocompatibility, titanium alloys are widely used in the fields of aviation, aerospace, marine, petroleum, chemical and biomedical engineering. Widely used. With the great progress of industrial technology, the application fields of titanium alloys are becoming wider and wider, and the dosage is increasing, while the working conditions of service are becoming more and more harsh. Therefore, the performance requirements for titanium alloys are also improved; however, titanium alloys have fatal shortcomings such as large friction coefficient, low microhardness, and poor we...

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Problems solved by technology

Therefore, the performance requirements for titanium alloys are also improved; however, titanium alloys have fatal shortcomings such as large friction coefficient, low microhardness, and poor wear resistance, which restrict their development. As the performance requirements for titanium and titanium alloys are getting higher and higher , how to effectively improve the surface properties of titanium and titanium alloys has become a current research hotspot; Graphene is made of carbon atoms with sp 2 Hybrid orbitals form a hexagonal planar film with a honeycomb lattice, a two-dimensional material with a thickness of only one carbon atom, which is the basic unit for constructing carbonaceous materials in other dimensions, and is the basic unit for constituting carbonaceous materials in other dimensions; while graphene The special structure determines its excellent performance, its physical and mechanical properties are much higher than other materials, and its specific surface area is as high as 2630m 2 / g, the strength reaches 130GPa, the bandgap width is almost zero, its thermal conductivity is also as high as 5000W / (m·K), and the graphene carrier mobility is as high as 2×105cm 2 / (V s), the elastic modulus (1100GPa) and tensile strength (125GPa) of graphene are both very large, which are comparable to nanotubes. Through research, it is found that graphene-enhanced metal matrix composites have higher specific strength and Good wear resistance, therefore, it is currently applied to graphene-reinforced aluminum-based and copper-based composite materials to improve the performance of the material; methods to improve the surface performance and service life of titanium alloy parts usually include laser cladding, electric Spark impact, nitriding, carburizing, etc., but these methods are high in cost, complicated in operation and process, high in cost, and limited in popularization and application; in recent years, argon arc cladding technology has become an emerging surface strengthening technology, It has the advantages of simple operation, small dilution rate, and low equipment price, and is suitable for surface strengthening of complex parts; using argon arc deposition technology, it is a titanium alloy surface to deposit graphene on the surface of titanium alloy to obtain a composite coating. A new way of strengthening, in addition, the study of argon arc welding graphene reinforced titanium-based composite coating has not been reported

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