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Tungsten carbide spray powder containing modified graphene for preparing self-lubricating wear-resistant coating

A wear-resistant coating and spraying powder technology, which is applied in the field of graphene/nano-tungsten carbide composite materials, can solve the problems of graphene with large specific surface area, high activity, and easy agglomeration, and achieve high coating bonding strength and low oxide content. The effect of low and high microhardness

Active Publication Date: 2020-06-16
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphene is a carbon material with nano-scale single-layer structure, and its weight is relatively light. Ceramic tungsten carbide spray powder has a large mass. If graphene is directly added to tungsten carbide spray powder, graphene will be sprayed by high-speed flame flow Blowing away and loss, it is difficult to retain the graphene component in the coating
In addition, graphene has a large specific surface area and high activity. It is easy to agglomerate when it is combined with tungsten carbide spray powder. It is difficult to ensure uniform mixing in the spray powder, so it is difficult to ensure that the prepared coating has self-lubricating and wear-resistant properties.

Method used

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  • Tungsten carbide spray powder containing modified graphene for preparing self-lubricating wear-resistant coating
  • Tungsten carbide spray powder containing modified graphene for preparing self-lubricating wear-resistant coating
  • Tungsten carbide spray powder containing modified graphene for preparing self-lubricating wear-resistant coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In the present invention, first carry out the preparation of modified graphene (graphene modified tungsten carbide self-lubricating wear-resistant additive) The preparation process is as follows:

[0029]Weigh 1g of graphene oxide, add 1000g of absolute ethanol, stir and mix evenly, add 50g of deionized water for mixing, in an ultrasonic disperser, select a 10mm amplitude rod, ultrasonic treatment time is 30min, and ultrasonic frequency is 10Hz to obtain graphite Graphene dispersion mixed solution, respectively weighed 99% of the mass percentage of ammonium metatungstate and 1% of tungsten carbonyl to mix into a tungsten-containing precursor mixture, weighed 1g of the tungsten-containing precursor mixture was added to the graphene dispersion solution, Stir for 30 minutes. During the stirring process, add absolute ethanol continuously, and the drop amount is 18g. Then filter the obtained precipitate with suction, heat in an oven at 70°C, and dry for 10 minutes. Put the ob...

Embodiment 2

[0041] On the basis of the above examples, further, in this example, the preparation process of modified graphene (that is, graphene modified tungsten carbide self-lubricating wear-resistant additive) is as follows:

[0042] Weigh 2g of graphene oxide, add 1000g of absolute ethanol, stir and mix evenly, add 60g of deionized water for mixing, in an ultrasonic disperser, select a 10mm amplitude rod, ultrasonic treatment time is 60min, and ultrasonic frequency is 12Hz to obtain graphite Graphene dispersion mixed solution, respectively weighed 99% of the mass percentage of ammonium metatungstate and 1% of tungsten carbonyl to mix into a tungsten-containing precursor mixture, weighed 1g of the tungsten-containing precursor mixture was added to the graphene dispersion solution, Stir for 40 minutes. During the stirring process, add absolute ethanol continuously. The dropping amount is 84g. Then filter the obtained precipitate with suction, heat in an oven at 80°C, and dry for 20 minut...

Embodiment 3

[0049] On the basis of the above examples, further, in this example, the preparation process of modified graphene (graphene modified tungsten carbide self-lubricating wear-resistant additive) is as follows:

[0050] Weigh 3g of graphene oxide, add 1000g of absolute ethanol, stir and mix evenly, add 700g of deionized water for mixing, in an ultrasonic disperser, select a 10mm amplitude rod, ultrasonic treatment time is 120min, and ultrasonic frequency is 12Hz to obtain graphite Graphene dispersion mixed solution, respectively weighed 99% of the mass percentage of ammonium metatungstate and 1% of tungsten carbonyl to mix into a tungsten-containing precursor mixture, weighed 1g of the tungsten-containing precursor mixture was added to the graphene dispersion solution, Stir for 50 minutes. During the stirring process, add absolute ethanol continuously, and the amount of dropping is 168g. Then filter the obtained precipitate with suction, heat in an oven at 80°C, and dry for 20 minu...

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Abstract

The invention provides a modified graphene-containing tungsten carbide spray powder for preparing a self-lubricating wear-resistant coating, which comprises the following steps: 1) weighing a certain amount of modified graphene / nano-tungsten carbide composite material. Mix with a certain amount of absolute ethanol, and obtain a mixed solution of graphene / nano-tungsten carbide composite material after ultrasonic dispersion. 2) Weigh a certain amount of tungsten carbide / cobalt spray powder and add it into the mixed solution of graphene nano-tungsten carbide composite material. 3) The tungsten carbide / cobalt spray powder compounded with modified graphene was obtained by vacuum freeze-drying. 4) A tungsten carbide / cobalt self-lubricating wear-resistant coating compounded with modified graphene was prepared on the surface of the cleaned and sandblasted parts by thermal spraying process. The invention not only retains the layered single-layer carbonaceous structural characteristics of graphene, but also increases the specific gravity of graphene by the grown nano-carbide particles. In addition, the freeze-drying method can avoid the loss of graphene caused by ball milling or other powder mixing processes. .

Description

technical field [0001] The invention belongs to the technical field of graphene / nano tungsten carbide composite materials, and in particular relates to a modified graphene-containing tungsten carbide spray powder for preparing self-lubricating and wear-resistant coatings. Background technique [0002] Thermal sprayed tungsten carbide coating has the advantages of high microhardness, good wear resistance, low oxide content, and high coating bonding strength. It is a commonly used wear-resistant coating and has been widely used in aviation, aerospace, and nuclear energy. Surface wear protection of key frictional motion pair parts of equipment in industrial fields such as machinery and machinery. However, in the actual working environment, due to the high hardness of the tungsten carbide coating, the friction coefficient of the friction system is relatively large, which will cause serious wear to the friction pair matched with it, and even affect the service life of the wear-re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/126C01B32/949C01B32/182B82Y30/00
CPCC23C4/06C23C4/126B22F2999/00B22F1/14B22F2201/20
Inventor 田浩亮崔永静郭孟秋汤智慧王长亮高俊国张欢欢周子民
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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