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Preparation method of wear-resistant anti-friction coating with highly dispersed and distributed lubricating phase

A technology of dispersion distribution and anti-friction coating, applied in the direction of coating, metal material coating process, melt spraying, etc. Affect the friction and wear resistance of the coating, and achieve the effect of optimization of wear and friction reduction performance, excellent bonding strength, and improved bonding strength

Active Publication Date: 2019-03-12
XI AN JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the particle jet density of these traditional thermal spraying technologies is low, resulting in low strength and bonding strength of the prepared coating, high porosity, and general performance of the coating.
Although the late supersonic flame spraying (HVOF) technology has improved the performance of the anti-friction and wear-resistant coating, there are still a few unmelted particles in the coating, which affects the anti-friction and wear resistance of the coating to a certain extent. , can not well meet the requirements of the use of turbomachinery

Method used

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  • Preparation method of wear-resistant anti-friction coating with highly dispersed and distributed lubricating phase
  • Preparation method of wear-resistant anti-friction coating with highly dispersed and distributed lubricating phase
  • Preparation method of wear-resistant anti-friction coating with highly dispersed and distributed lubricating phase

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preparation example Construction

[0031] The preparation method of the wear-resistant and anti-friction coating with a highly dispersed lubricating phase of the present invention comprises the following steps:

[0032] 1) Pre-treat the surface of the substrate before spraying.

[0033] 2) Preheating the substrate after pretreatment.

[0034] 3) The raw material is sprayed on the surface of the preheated substrate by using the internal powder feeding high-energy plasma spraying method to prepare the anti-friction and wear-resistant coating.

[0035] 4) Machining and polishing the surface of the metal part after spraying.

[0036] The specific process of the pretreatment in the step 1) is: firstly carry out degreasing and decontamination and grinding and derusting, then use acetone to ultrasonically clean, after cleaning, put it into a drying box for drying, and finally use white corundum (#24) to carry out Sandblasting.

[0037] In the step 2), the spray gun is preheated, and the temperature is controlled at...

Embodiment 1

[0041] In this embodiment, Q235 carbon structural steel is used as the matrix, the size is 45×20×5mm, and the mass percentages are: ≤0.22% of C, ≤1.0% of Si, ≤1.4% of Mn, ≤0.044% of P, ≤0.35% % Si, ≤0.05% S and the balance being Fe.

[0042] The coating is a high wear-resistant coating with a thickness of 1.6mm on the surface of the substrate, and the coating material is nickel-coated graphite powder.

[0043] The particle size range of the Ni-C powder (nickel-coated graphite powder) is 30-150 μm; by weight percentage, the Ni content is 75 wt%, and the C content is 25 wt%.

[0044] The specific implementation steps for preparing a wear-resistant and anti-friction coating with a highly dispersed lubricating phase are:

[0045] 1) Substrate surface pretreatment

[0046]The surface of the Q235 carbon structural steel used as the base material is first degreased, decontaminated, polished and derusted, then ultrasonically cleaned with acetone, dried in a drying oven after cleanin...

Embodiment 2

[0052] In this embodiment, Q235 carbon structural steel is used as the matrix, the size is 45×20×5mm, and the mass percentages are: ≤0.22% of C, ≤1.0% of Si, ≤1.4% of Mn, ≤0.044% of P, ≤0.35% % Si, ≤0.05% S and the balance being Fe.

[0053] The coating is a high wear-resistant coating with a thickness of 1.8mm on the surface of the substrate, and the coating material is composite powder of AlSi and polyphenylene resin.

[0054] The particle size of the AlSi and polyphenylene resin composite powder (AlSi-polyphenylene resin powder) ranges from 20 to 100 μm; the AlSi content is 60 wt%, and the polyphenylene resin content is 40 wt%.

[0055] The specific implementation steps for preparing a wear-resistant and anti-friction coating with a highly dispersed lubricating phase are:

[0056] 1) Substrate surface pretreatment

[0057] The surface of the Q235 carbon structural steel sheet used as the base material is first degreased, decontaminated, polished and derusted, then ultraso...

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Abstract

The invention relates to a preparation method of a wear-resistant anti-friction coating with a highly dispersed and distributed lubricating phase. According to the preparation method, powder such as Ni-C, AlSi-polyphenyl ester and NiCr-BN-MoS2 which have the self-lubricating property is used as a raw material, and an internal powder feeding high-energy plasma spraying method is adopted for formingthe wear-resistant anti-friction coating on a metal substrate. According to the preparation method, through reasonable thermal spraying process parameters, the spraying technological process is strictly controlled, the porosity of the coating is reduced, the hardness and the bonding force are improved, the comprehensive mechanical properties are greatly improved, the wear-resisting anti-frictionperformance is obviously optimized, and the work service life of turbomachinery is effectively prolonged.

Description

technical field [0001] The invention belongs to the field of metal surface modification, and in particular relates to a method for preparing a wear-resistant and anti-friction coating with highly dispersed lubricating phases. Background technique [0002] Turbomachinery is a kind of dynamic fluid machinery that realizes energy conversion through the high-speed rotation of the blades to generate force interaction between the fluid and the blades. It is widely used in the manufacture of steam turbines, engines and other equipment. However, due to factors such as assembly tolerances, thermal expansion, centrifugal strain, and vibration displacement during the production and service of turbomachinery, there are large or small gaps between the blades and the casing, resulting in reduced equipment efficiency and long service life. greatly shortened. In recent years, the preparation of spraying technology has been widely used in the turbomachinery industry due to its advantages of...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/06
CPCC23C4/06C23C4/134
Inventor 白宇丁飞郭文勇韩增福柳琪
Owner XI AN JIAOTONG UNIV
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