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Tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating and preparation method thereof

A technology of tungsten carbide cobalt: copper, tungsten carbide cobalt, which is applied in the field of tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating and its preparation field, to achieve the effect of improving friction and wear performance

Inactive Publication Date: 2011-09-21
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] So far, tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coatings and the preparation of such composite coatings by atmospheric plasma spraying technology have not been reported.

Method used

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  • Tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating and preparation method thereof
  • Tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating and preparation method thereof
  • Tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0041] The powder for atmospheric plasma spraying is 70wt.%WC-Co-18wt.%Cu-12wt.%MoS 2 Powder, spraying base material is A3 low carbon steel plate. Before atmospheric plasma spraying, SiC sand particles are used to pre-process the surface of the sprayed substrate. After pretreatment, the atmospheric plasma spraying system is used for spraying within two hours. With argon as the main gas, hydrogen as the auxiliary gas, the gas flow rates of argon and hydrogen are 50 slpm and 3 slpm respectively; when argon is used as the powder feeding gas, the powder feeding gas flow is 5 slpm, and the powder feeding rate is 14 rpm; used in the spraying process The current is 400A, the voltage is 55V, the spraying distance is 100mm, and the spraying is 25 times. The thickness of the prepared coating is about 250 μm.

[0042] 70wt.%WC-Co-18wt.%Cu-12wt.%MoS 2 The friction coefficient of the coating is about 0.05, and the wear rate is about (6.7±0.4)×10 -5 mm 3 N -1 m -1 , While the friction coeffic...

Embodiment 2

[0044] The gas flow rates of the main gas and auxiliary gas of the atmospheric plasma spraying in Example 1 were changed to 75 slpm and 3 slpm, respectively, and the other experimental conditions were the same. The resulting 70wt.%WC-Co-18wt.%Cu-12wt.%MoS 2 The friction coefficient of the coating is about 0.07, and the wear rate is about (7.3±0.5)×10 -5 mm 3 N -1 m -1 , While the friction coefficient of the traditional WC-Co coating is about 0.42, and the wear rate is about (25.7±2.8)×10 -5 mm 3 N -1 m -1 . The friction coefficient and wear rate of the composite coating have been significantly improved.

Embodiment 3

[0046] The current of atmospheric plasma spraying in Example 1 was changed to 450A, and the other experimental conditions were the same. The resulting 70wt.%WC-Co-18wt.%Cu-12wt.%MoS 2 The friction coefficient of the coating is about 0.08, and the wear rate is about (6.4±0.3)×10 -5 mm 3 N -1 m -1 , While the friction coefficient of the traditional WC-Co coating is about 0.42, and the wear rate is about (25.7±2.8)×10 -5 mm 3 N -1 m -1 . The friction coefficient and wear rate of the composite coating have been significantly improved.

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Abstract

The invention discloses a tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating and a preparation method thereof. The preparation method is characterized by comprising the following steps of: preparing tungsten carbide cobalt-copper-molybdenum disulfide composite powder by taking tungsten carbide cobalt, copper and molybdenum disulfide as raw materials and by a sintering crushing method; and obtaining a tungsten carbide cobalt-copper-molybdenum disulfide composite coating by an atmospheric plasma spraying method. In the composite coating, the ratio of tungsten carbide cobalt to copper to molybdenum disulfide is equal to (70-90):(6-18):balance; and the thickness is 200 to 400mu m. Compared with the traditional tungsten carbide cobalt coating, the tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating has the advantages that: the friction coefficient and the wear rate of the tungsten carbide cobalt-copper-molybdenum disulfide composite coating are remarkably reduced; and the tungsten carbide cobalt-copper-molybdenum disulfide composite coating is an excellent self-lubricating wear-resistant coating.

Description

Technical field [0001] The invention relates to a tungsten carbide cobalt-copper-molybdenum disulfide self-lubricating wear-resistant coating and a preparation method thereof. It belongs to the technical field of protective materials. Background technique [0002] The development of mechanical manufacturing and cutting-edge technology is closely related to the maximum limit of material performance, but with the continuous increase of the working stress and working temperature of the material, the material often fails due to wear before reaching the service limit. In the United States, the damage caused by wear and tear in 1985 was estimated at 20 billion U.S. dollars. [Budinski K.G., Surface Engineering for Wear Resistance.PrenticeHall.N.J.USA.1988.] If the losses caused by wear and corrosion are added together, it is estimated to reach 200 billion US dollars. [Bernecki T.F..Ceramic Industry.1989, 10:39.] In Germany, experts estimate that the annual loss due to wear and corrosi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/04C23C4/12C23C4/134
Inventor 袁建辉祝迎春季珩郑学斌杨涛
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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