Amorphous composite coating and preparation method thereof

A technology of composite coating and iron-based amorphous alloy, which is applied in the direction of coating, metal material coating process, fusion spraying, etc., can solve the problem of low graphene density, difficulty in uniform dispersion of metal powder, and high requirements for graphene coating. problems, to achieve the effect of increased corrosion potential and reduced wear

Inactive Publication Date: 2019-05-21
SHANGHAI OCEAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for preparing an amorphous composite coating, which mainly solves the problem that graphene and amorphous powder are difficult to uniformly deposit on the surface of a substrate at the same time due to the small density of graphene and the large density of amorphous powder, and the direct preparation Graphene coating requires high requirements and low efficiency
[0006] (1) Use spray granulation technology to compound nickel powder and graphene oxide powder, and then reduce graphene oxide to graphene through thermal reduction, and use nickel metal as the carrier of graphene to solve the problem that graphene has a low density and is difficult to spray directly. And the problem that it is difficult to disperse evenly with metal powder

Method used

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  • Amorphous composite coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0040] (1) Weigh single-layer graphene oxide powder with a thickness of 0.1-10 μm and a sheet diameter of 5-100 μm and metal nickel powder with a particle size of 0.5-50 μm, and mix them at a mass ratio of 1:49 to form a composite powder, Added to the mixed solution composed of binder, dispersant and deionized water accounting for 38%, 1.3% and 180% of the total mass of the composite powder respectively, after ultrasonic oscillation for 0.5h and mechanical stirring for 0.5h, the mixed slurry.

[0041] (2) carry out spray granulation to above-mentioned mixed slurry in spray drying tower, its inlet temperature is 150 ℃, and outlet temperature is 100 ℃, and pressure is 0.5MPa, and the rotating speed of atomizing disc in spray drying tower is 15000r / min, Under the action of surface tension, the mixed slurry shrinks into a composite feeding ball with a particle size of 20-40 μm.

[0042] (3) Thermally reduce the above composite feeding balls in a vacuum heat treatment furnace, the...

Embodiment 2

[0045] (1) Weigh multilayer graphene oxide powder with a thickness of 0.1-10 μm and a sheet diameter of 5-100 μm and nickel alloy powder with a particle size of 0.5-50 μm, and mix them at a mass ratio of 1:9 to form a composite powder, Add it to the mixed solution consisting of binder, dispersant and deionized water accounting for 30%, 0.5% and 100% of the total mass of the composite powder, and after ultrasonic oscillation for 0.2h and mechanical stirring for 3h, the mixed slurry is obtained material.

[0046] (2) The above-mentioned mixed slurry is sprayed and granulated in the spray drying tower. The inlet temperature is 300°C, the outlet temperature is 140°C, and the pressure is 1MPa. The rotating speed of the atomizing disc in the spray drying tower is 30000r / min. Under the action of surface tension, the mixed slurry shrinks into a composite feeding ball with a particle size of 40-70 μm.

[0047] (3) Thermally reduce the above composite feeding balls in a vacuum heat tre...

Embodiment 3

[0049] (1) Weigh single-layer graphene oxide powder with a thickness of 0.1-10 μm and a sheet diameter of 5-100 μm and nickel alloy powder with a particle size of 0.5-50 μm, and mix them at a mass ratio of 1:99 to form a composite powder, Add it to the mixed solution composed of binder, dispersant and deionized water accounting for 70%, 3% and 300% of the total mass of the composite powder, and after ultrasonic oscillation for 0.3h and mechanical stirring for 1h, the mixed slurry was prepared material.

[0050] (2) The above-mentioned mixed slurry is sprayed and granulated in the spray drying tower, the inlet temperature is 200°C, the outlet temperature is 120°C, the pressure is 0.8MPa, and the rotating speed of the atomizing disc in the spray drying tower is 20000r / min, Under the action of surface tension, the mixed slurry shrinks into a composite feeding ball with a particle size of 40-70 μm.

[0051] (3) Thermally reduce the above compound feeding balls in a vacuum heat tr...

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Abstract

The invention discloses an amorphous composite coating and a preparation method thereof. The amorphous composite coating comprises the following steps that composite powder consisting of graphene oxide powder and metal powder are added into a mixed solution consisting of a binder, a dispersant and deionized water, ultrasonic oscillation and mechanical stirring are carried out to obtain mixed slurry, the mixed slurry is subjected to spray granulation and thermal reduction to obtain graphene-metal composite powder; the surface of a substrate is pre-treated and uniformly sprayed with a nickel-coated aluminum bonding bottom layer; and graphene-metal composite powder and iron-based amorphous alloy powder are used as feed powder, and thermal spraying is carried out on the surface of the substrate through multi-channel powder feeding to obtain a graphene-metal-iron-based amorphous composite coating with high wear resistance and corrosion resistance. Compared with a single amorphous coating, the wearing capacity of the graphene-metal-iron-based amorphous composite coating is lowered by 73% and the corrosion potential is increased substantially.

Description

technical field [0001] The invention belongs to the technical field of surface coatings, and in particular relates to an amorphous composite coating and a preparation method thereof. Background technique [0002] Amorphous alloy is a long-range disordered structure obtained by ultra-rapid solidification. There are no grains and grain boundaries of crystalline alloys. The special structure of amorphous alloys determines that it has unique magnetic properties, mechanical properties, electrical properties, and corrosion resistance. etc. Using amorphous alloys as coating materials in the field of material surface technology can play a very good protective role. Among them, the typical feature of iron-based amorphous alloys is that they contain a large amount of metalloids (such as B, P, and C), which can promote the formation of amorphous, and form a passivation film to a certain extent, and enhance the corrosion resistance of amorphous alloys. Chu Zhenhua et al. (Surface and C...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/134C23C4/06C22C45/02
Inventor 褚振华郑兴伟王世明高丽许竞翔周玉云
Owner SHANGHAI OCEAN UNIV
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