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Preparation method of composite powder, dynamic friction sealing coating and preparation method

A technology of composite powder and sealing coating, which is applied in coatings, chemical instruments and methods, metal material coating technology, etc., can solve problems such as cracking, high stress, and reduce wear rate, so as to improve toughness and reduce the risk of cracking , good fluidity and the effect of spraying performance

Pending Publication Date: 2021-12-10
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to overcome above-mentioned defect, a kind of preparation method of chromium oxide / graphene composite powder is provided, and Cr 2 o 3 Granulated separately from graphene, and designed Cr 2 o 3 With the ratio of graphene spherical powder, obtain a kind of chromium oxide / graphene composite powder that is used for dynamic friction sealing coating; Provide a kind of preparation method of chromium oxide / graphene dynamic friction sealing coating, utilize above-mentioned composite powder to pass through plasma A new type of chromium oxide / graphene dynamic friction sealing coating was obtained by spraying. The coating has a dual-phase chemical composition, and the structure is dense / loose. , at the same time, the self-lubricating effect of the coating reduces the wear rate, which can meet the needs of dynamic sealing on the surface of the high-speed friction moving ring

Method used

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  • Preparation method of composite powder, dynamic friction sealing coating and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The preparation process of a kind of chromium oxide / graphene dynamic friction sealing coating of the present embodiment is as follows:

[0050] 1) Clean the surface of the substrate and perform sandblasting;

[0051] 2) Spray composite coating: use atmospheric plasma spraying method to spray chromium oxide / graphene composite powder on the surface of stainless steel substrate to prepare chromium oxide / graphene composite coating. The spraying parameters are: spraying distance 100mm, spraying current 650A, spraying Voltage 60V, H 2 The flow rate is 15L / min, the powder feeding rate is 20g / min, and the coating thickness is 0.3mm;

[0052] 3) Fine grinding: Use a fine grinder to grind and finish the surface of the composite coating, so that the surface roughness Ra reaches 0.05-0.2 μm, and the coating thickness after grinding is about 0.2 mm.

[0053] Described step 2) in, the preparation method of chromium oxide / graphene composite powder is as follows:

[0054] 21) Prepar...

Embodiment 2

[0060] The preparation process of a kind of chromium oxide / graphene dynamic friction sealing coating of the present embodiment is as follows:

[0061] 1) Clean the surface of the substrate and perform sandblasting;

[0062] 2) Spray composite coating: use atmospheric plasma spraying method to spray chromium oxide / graphene composite powder on the surface of stainless steel substrate to prepare chromium oxide / graphene composite coating. The spraying parameters are: spraying distance 95mm, spraying current 630A, spraying Voltage 55V, H 2 The flow rate is 10L / min, the powder feeding rate is 15g / min, and the coating thickness is 0.45mm.

[0063] 3) Fine grinding: Use a fine grinder to grind and finish the surface of the composite coating, so that the surface roughness Ra reaches 0.05-0.2 μm, and the coating thickness after grinding is about 0.32 mm.

[0064] Described step 2) in, the preparation method of chromium oxide / graphene composite powder is as follows:

[0065] 21) Prepa...

Embodiment 3

[0071] The preparation process of a kind of chromium oxide / graphene dynamic friction sealing coating of the present embodiment is as follows:

[0072] 1) Clean the surface of the substrate and perform sandblasting;

[0073]2) Spray composite coating: use atmospheric plasma spraying method to spray chromium oxide / graphene composite powder on the surface of stainless steel substrate to prepare chromium oxide / graphene composite coating. The spraying parameters are: spraying distance 95mm, spraying current 630A, spraying Voltage 55V, H 2 The flow rate is 10L / min, the powder feeding rate is 15g / min, and the coating thickness is 0.6mm.

[0074] 3) Fine grinding: Use a fine grinder to grind and finish the surface of the composite coating, so that the surface roughness Ra reaches 0.05-0.2 μm, and the coating thickness after grinding is about 0.45 mm.

[0075] Described step 2) in, the preparation method of chromium oxide / graphene composite powder is as follows:

[0076] 21) Prepara...

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Abstract

The invention provides a preparation method of chromium oxide / graphene composite powder. Cr2O3 and graphene are respectively granulated, the proportion of Cr2O3 to graphene spherical powder is designed, so that the Cr2O3 and the graphene in the composite powder are spherical, the particle size distribution is 40-120 microns, compared with graphene powder directly added into Cr2O3 thermal spraying powder, the chromium oxide / graphene composite powder has better flowability and spraying performance, the chromium oxide / graphene composite powder for the dynamic friction sealing coating is obtained, according to the preparation method, the novel chromium oxide / graphene dynamic friction sealing coating is obtained by utilizing the composite powder through plasma spraying, and the coating has a dual-phase chemical composition, and is compact / loose in structure and multi-element coordinated in structure. The problem of cracking caused by overlarge stress in the preparation process of an existing chromium oxide coating is solved, meanwhile, the abrasion rate is reduced through the self-lubricating effect of the coating, and the requirement for dynamic sealing of the surface of a high-speed friction moving ring can be met.

Description

technical field [0001] The invention relates to a composite powder for a dynamic friction sealing coating, a dynamic friction sealing coating and a preparation method, and belongs to the field of thermal spraying. Background technique [0002] As the flight speed of the new generation of aerospace equipment increases, the requirements for the dynamic seal of the engine turbo pump end face are higher. Working in environments such as corrosion and corrosion requires good ductility and wear resistance. Cemented carbide materials usually have good strength and toughness, but the rate of friction loss is fast, so wear-resistant coatings are usually required, which not only improves the sealing effect of the surface, but also reduces the dynamic friction coefficient of the coating and reduces energy loss. [0003] At present, the materials used for the moving ring mainly include WC, TiN, Al 2 o 3 and Cr 2 o 3 etc. The preparation techniques include supersonic flame spraying (...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04C23C4/134C01G37/033C01B32/194
CPCC23C4/04C23C4/134C01G37/033C01B32/194C01P2004/03
Inventor 李春文波倪立勇杨震晓马康智曲栋贺晨
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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