Thermal spraying powder

A technology of thermal spraying powder and graphene powder, which is applied in coating, fusion spraying, metal material coating process, etc., can solve the problems of poor self-lubricating performance of graphene-ceramic coating, and achieve easy industrial operation and high hardness The effect of improving and good self-lubricating effect

Inactive Publication Date: 2019-07-02
LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to solve the problem of poor self-lubricating performance of the graphene-ceramic coating caused by the oxidation of graphene at high temperature in the existing spraying process, and to provide a thermal spraying powder

Method used

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Examples

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Effect test

preparation example Construction

[0035] 1. Preparation of thermal spray powder:

[0036] 1. Preparation of alumina-coated graphene powder:

[0037] Weigh 0.4g graphene (Nanjing Xianfeng Nano Material Technology Co., Ltd.) at room temperature, add it to 200mL ethanol, and sonicate for 2h. Another 14.49g (0.06mol) AlCl was weighed 3 ·6H 2 O, dissolved in 200mL deionized water, and then the two solutions were mixed and continued to stir in an ultrasonic bath for 30min. Add ammonia water dropwise to the above mixture until pH = 9 to generate Al(OH) 3 gel. The gel was centrifuged and washed three times with 50% ethanol aqueous solution, dried at 80°C for 12h and crushed, then burned at 1200°C under the protection of inert gas for 4h, ground and passed through a 0.075mm sieve to obtain alumina-coated graphene powder (ACG) , the theoretical mass fraction of graphene is 11.6%.

[0038] see figure 1 ,from figure 1 It can be seen that the coating of alumina on graphene is relatively uniform and complete, and th...

Embodiment 1

[0044] Mix 8.7g ACG, 1.3g TCG (containing 1g graphene in total) with 90g AT-13 spray powder, add 500mL of absolute ethanol, stir in an ultrasonic bath for 2h, and dry at 80°C for 12h to obtain a graphene containing 1% mass fraction. Mixed powder, namely AT-13+ACG, TCG mixed powder, recorded as ATG-1.

[0045] Use plasma spraying equipment to spray the coating on the 304 stainless steel substrate. When spraying, the flame gun is 15cm away from the substrate, and the spraying time is 30s. Repeat 4 times. The size of the substrate is 25×25×5mm. Before spraying the ceramic coating, it is sandblasted and sprayed with a transition layer. The sandblasting pressure is 0.6-0.7MPa. 24 mesh white corundum sand is used. The transition layer is NiAl alloy, and the mass ratio of Ni and Al is It is 2:8.

Embodiment 2

[0047] Mix 15.2 g ACG, 2.2 g TCG (containing 2 g graphene in total) with 82.6 g AT-13 spraying powder, add 500 mL of absolute ethanol, stir in an ultrasonic bath for 2 h, and dry at 80 ° C for 12 h to obtain graphite with a mass fraction of 2%. The mixed powder of alkene is recorded as ATG-2.

[0048] Use plasma spraying equipment to spray the coating on the 304 stainless steel substrate. When spraying, the flame gun is 15cm away from the substrate, and the spraying time is 30s. Repeat 4 times. The size of the substrate is 25×25×5mm. Before spraying the ceramic coating, it is sandblasted and sprayed with a transition layer. The sandblasting pressure is 0.6-0.7MPa. 24 mesh white corundum sand is used. The transition layer is NiAl alloy, and the mass ratio of Ni and Al is It is 2:8.

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Abstract

The invention discloses thermal spraying powder. Aluminum oxide or titanium dioxide is used, graphene is coated to make particles, thus the graphene is protected from being oxidized by a high temperature in the thermal spraying process, and the graphene in a thermal spraying coating to maximum extent. Ceramic powder is coated on the surface of the graphene to form graphene particles coated by theceramic powder, in the process of thermal spraying, the graphene is isolated from the high temperature through the ceramic powder, thus the graphene is not prone to being gasified and lost, a large amount of grahene remains in the coating after spraying, thus the prepared coating has the good self-lubricating effect, wear-resisting performance of the coating is improved, and application of the coating is broadened. The preparation method of the thermal spraying powder is simple, high in success rate and convenient to industrial operation.

Description

technical field [0001] The invention relates to the field of thermal spraying, in particular to a thermal spraying powder. Background technique [0002] With the advancement of science and technology, industrial production is also developing towards high automation and high speed, which also makes many parts (such as bearings, knives, etc.) work under harsh environmental conditions such as heavy load, high speed, high temperature, and strong corrosion. These use environments exceed the use limit of lubricating grease. Even if the parts are coated with ceramic coatings, it is still difficult to meet the long-term normal operation of the parts in these environments, and the service life of the parts is low. Therefore, people are working on the development of ceramic coatings with self-lubricating properties. By coating a layer of ceramic coatings on the surface of parts, the parts can be endowed with high temperature corrosion resistance, low thermal conductivity, good thermal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/10C23C4/129C23C4/134C01B32/182C01F7/34C01G23/053
CPCC01F7/34C01G23/053C01P2002/72C01P2004/03C23C4/10C23C4/129C23C4/134C01B32/182
Inventor 冯彦寒方建华吴江刘坪王鑫姜自超丁建华江泽琦林旺
Owner LOGISTICAL ENGINEERING UNIVERSITY OF PLA
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