Graphene/titanium carbide composite coating and preparation method thereof

A composite coating and graphene technology, applied in the coating, metal material coating process, etc., can solve the problems of poor wear resistance, high brittleness, insufficient bonding force with the substrate, etc., achieve excellent mechanical properties and improve anti-wear properties , Improve the effect of intrinsic brittleness

Active Publication Date: 2017-01-11
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the problem of poor wear resistance of TiC coatings in the prior art due to high brittleness and insufficient bonding force with the substrate under high-speed and heavy-load conditions, and to provide a new type of TiC-based composite coating. layer and its simple and efficient preparation method

Method used

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  • Graphene/titanium carbide composite coating and preparation method thereof
  • Graphene/titanium carbide composite coating and preparation method thereof
  • Graphene/titanium carbide composite coating and preparation method thereof

Examples

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Embodiment 1

[0032] The preparation of embodiment 1 tool electrode

[0033] Titanium carbide with a particle size of 0.2-2 μm and zinc stearate (mass ratio 99:1) are uniformly mixed by ball milling, and the resulting mixture is pressed into a stainless steel mold with a molding pressure of 15 MPa. Under the protection of the atmosphere, sinter at 700°C for 1 hour, and then obtain a titanium carbide semi-sintered body used as a tool electrode after cooling in the furnace.

Embodiment 2

[0035] The difference from Example 1 lies in that the molding pressure is 5 MPa, the sintering temperature is 1000° C., and the sintering time is 3 hours.

Embodiment 3

[0036] The preparation of embodiment 3 graphene / kerosene solid-liquid mixed processing fluid

[0037] The graphene / kerosene solid-liquid mixed processing fluid is composed of graphene 600 and kerosene 700 solid-liquid two-phase. Graphene is modified by alkyl functionalization before mixing with kerosene. In this example, an alkyl functional group with a carbon chain length of C12-C18 is grafted on the surface of graphene through the two-step method of acylation activation and amide reaction.

[0038] The steps of graphene alkyl functional modification are as follows: take 1 g of graphene containing -COOH functional groups on the surface and disperse it in 1 L of a mixture of dimethylformamide and thionyl chloride (volume ratio 1:1), and react at 70°C After 24 hours, it was filtered and vacuum-dried at 100°C to obtain acylated activated graphene. The acylated activated graphene was dispersed in 1L dodecylamine liquid, reacted at 120°C for 4 days, filtered and dried in vacuum a...

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Abstract

The invention discloses a graphene / titanium carbide (TiC) composite coating and a preparation method thereof. According to the coating, TiC is used as a main phase, graphene, Fe and Fe3C are used as a second phase, the content of TiC accounts for 70wt%-90wt% of the coating, and the content of the graphene ranges from 0.1wt% to 1wt%. A TiC semi-sintered tool electrode and a workpiece are immersed in a solid-liquid mixed processing fluid prepared from alkyl functional modified graphene and kerosene, the tool electrode and the workpiece are adjusted and controlled to have the proper clearance, then impulsive discharge is performed, the TiC tool electrode is melted under the effect of energy produced by discharge and is transferred to a workpiece surface micro-melting bath, a micro-melting bath material is subjected to codeposition with the graphene dispersed in the working fluid on the surface of the workpiece in the process of re-solidification, and the graphene / TiC composite coating is formed on the surface of the workpiece finally. The composite coating is metallurgically bonded to the workpiece and has the advantages of high hardness, good toughness, friction reduction, abrasion resistance and the like, and the service life of a tool and the service life of a mold can be effectively prolonged.

Description

technical field [0001] The invention belongs to the technical field of workpiece surface treatment methods, and more specifically relates to a graphene / titanium carbide composite coating and a preparation method thereof. Background technique [0002] Due to the advantages of high hardness and good chemical stability, TiC coating can be used for wear-resistant coatings on machining and cutting tools, drill bits and various molding molds, and is also suitable for manufacturing wear-resistant parts, such as nozzles, etc. surface protective coating. However, TiC is inherently brittle, and due to the current mainstream technologies, such as physical vapor deposition (PVD) and chemical vapor deposition (CVD), there are reasons such as the low bonding force between the prepared TiC coating and the workpiece. The transverse fracture strength and compressive strength of the coating, especially the impact strength and fatigue strength, need to be improved, so that under the condition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/10
CPCC23C24/10
Inventor 麦永津揭晓华张留艳
Owner GUANGDONG UNIV OF TECH
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