Preparation method of graphene modified tungsten carbide self-lubrication antiwear additive

A graphene modification and wear-resistant additive technology, applied in the direction of graphene, carbide, tungsten/molybdenum carbide, etc., can solve the problem that it is difficult to ensure the self-lubricating and wear-resistant properties of the prepared coating, and it is difficult to uniformly mix the spray powder. Graphene has a large specific surface area and other problems, and achieves the effect of retaining the content and uniform distribution of components, reducing friction coefficient and large specific surface area.

Active Publication Date: 2017-11-03
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparation method of graphene modified tungsten carbide self-lubrication antiwear additive
  • Preparation method of graphene modified tungsten carbide self-lubrication antiwear additive

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Embodiment 1

[0026] The invention provides a graphene-modified tungsten carbide self-lubricating wear-resistant additive. The preparation process is as follows: a certain amount of graphite powder is added to a solution composed of concentrated H2SO4 (12mL), K2S2O8 (2.5g) and P2O5 (2.5g) , reacted at 80°C for 4.5 hours. After cooling to room temperature, 0.5 L of deionized water was added. and dry at room temperature. Add this pre-oxidized graphite powder to 150mL of concentrated H2SO4, keep the environment at 0°C with an ice-water bath, gradually add 15g KMnO4, and keep the temperature not exceeding 20°C, and stir at 35°C for 2 hours after the addition. Then 250 mL of deionized water was added and stirred for 2 hours. Then add 0.7 L of deionized water, then add 30 mL of 30% H2O2, dry at room temperature, and then dialyze in a dialysis bag for 1 week to remove heteroions. Finally, it was vacuum filtered and dried at room temperature to obtain graphene oxide.

[0027] Weigh 1g of graphe...

Embodiment 2

[0038] On the basis of the foregoing embodiments, the present embodiment provides a preparation process of a graphene-modified tungsten carbide self-lubricating wear-resistant additive as follows: a certain amount of graphite powder is added to concentrated H2SO4 (12mL), K2S2O8 (2.5g) and In a solution composed of P2O5 (2.5g), react at 80°C for 4.5 hours. After cooling to room temperature, 0.5 L of deionized water was added. and dry at room temperature. Add this pre-oxidized graphite powder to 150mL of concentrated H2SO4, keep the environment at 0°C with an ice-water bath, gradually add 15g KMnO4, and keep the temperature not exceeding 20°C, and stir at 35°C for 2 hours after the addition. Then 250 mL of deionized water was added and stirred for 2 hours. Then add 0.7 L of deionized water, then add 30 mL of 30% H2O2, dry at room temperature, and then dialyze in a dialysis bag for 1 week to remove heteroions. Finally, it was vacuum filtered and dried at room temperature to ob...

Embodiment 3

[0046] On the basis of the foregoing embodiments, the present embodiment provides a preparation process of a graphene-modified tungsten carbide self-lubricating wear-resistant additive as follows: a certain amount of graphite powder is added to concentrated H2SO4 (12mL), K2S2O8 (2.5g) and In a solution composed of P2O5 (2.5g), react at 80°C for 4.5 hours. After cooling to room temperature, 0.5 L of deionized water was added. and dry at room temperature. Add this pre-oxidized graphite powder to 150mL of concentrated H2SO4, keep the environment at 0°C with an ice-water bath, gradually add 15g KMnO4, and keep the temperature not exceeding 20°C, and stir at 35°C for 2 hours after the addition. Then 250 mL of deionized water was added and stirred for 2 hours. Then add 0.7 L of deionized water, then add 30 mL of 30% H2O2, dry at room temperature, and then dialyze in a dialysis bag for 1 week to remove heteroions. Finally, it was vacuum filtered and dried at room temperature to ob...

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Abstract

The invention discloses a preparation method of a graphene modified tungsten carbide self-lubrication antiwear additive, which comprises the following steps of: 1) weighing a certain amount of graphene and a tungstenic precursor compound, 2) performing wetting modification on the weighed graphene by a little absolute ethyl alcohol, dispersing in a certain amount of deionized water and performing ultrasonic dispersion, 3) dissolving the weighed tungstenic precursor compound in a graphene aqueous solution prepared in step 2) to form compound powder, and putting the compound powder in an oven to form dry mixed powder, and 4) putting the dry powder in an aluminum oxide crucible, performing vacuumizing, naturally cooling to room temperature in an atmosphere of H2, and obtaining the graphene modified tungsten carbide self-lubrication antiwear additive. The additive retains a layered single-layer carbon structure property of the graphene; growing nano carbide particles increase specific gravity of the graphene; and the self-lubrication antiwear additive is expected to be applied to thermal spraying of tungsten carbide spray powder, reduces a wear rate and exerts wear reduction and resistance effects.

Description

technical field [0001] The invention belongs to the field of graphene-modified tungsten carbide composite materials, and in particular relates to a preparation method of graphene-modified tungsten carbide self-lubricating and wear-resistant additives. Background technique [0002] After long-term research and analysis, it is found that graphene is a new carbonaceous material in which carbon atoms are tightly packed into a single-layer two-dimensional honeycomb lattice structure. It is the basic unit for building the most commonly used solid lubricant-graphite. Low friction coefficient, is a new type of self-lubricating anti-friction coating additive. However, graphene is a carbon material with a 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 It is difficult to retain the graphene com...

Claims

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Application Information

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IPC IPC(8): C01B32/949C01B32/182C09D1/00C09D7/12
CPCC01P2002/72C01P2004/03C08K3/04C09D1/00
Inventor 郭孟秋田浩亮汤智慧王长亮崔永静高俊国张欢欢周子民
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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