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Self-lubricating abrasion-resistant coating and preparation method thereof

A wear-resistant coating and self-lubricating technology, which is applied in coating, metal material coating process, fusion spraying, etc., to achieve the effect of improving friction and wear performance, uniform coating structure, and reducing crack and pore content

Inactive Publication Date: 2015-05-20
郴州市泰益表面涂层技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] So far, tungsten carbide cobalt-copper-fluoride 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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  • Self-lubricating abrasion-resistant coating and preparation method thereof
  • Self-lubricating abrasion-resistant coating and preparation method thereof
  • Self-lubricating abrasion-resistant coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The powder for atmospheric plasma spraying is 80% WC-Co-10% Cu-10% BaF by weight 2 / CaF 2 Powder, spraying base material is A3 low carbon steel plate. Before atmospheric plasma spraying, use SiC sand particles to carry out sandblasting pretreatment on the surface of the sprayed substrate, and after pretreatment, use atmospheric plasma spraying system for spraying. Argon is the main gas, hydrogen is the auxiliary gas, the gas flow rates of argon and hydrogen are 50 slpm and 3 slpm respectively; argon is used as the powder feeding gas, the powder feeding gas flow rate is 5 slpm, and the powder feeding rate is 14 rpm; The current used in the spraying process is 400A, the voltage is 55V, the spraying distance is 100 mm, and the spraying is done 25 times. The thickness of the prepared coating is about 300 μm.

[0034] 80% WC-Co-10% Cu-10% BaF 2 / CaF 2 The friction coefficient of the coating is about 0.02, and the wear rate is about (1.3±0.03)×10 -5 mm 3 N -1 m -1 , ...

Embodiment 2

[0036] The gas flow rates of the main gas and auxiliary gas for atmospheric plasma spraying in Example 1 were changed to 75 slpm and 3 slpm respectively, and other experimental conditions were the same. The resulting 80% WC-Co-10% Cu-10% BaF 2 / CaF 2 The friction coefficient of the coating is about 0.07, and the wear rate is about (2.4±0.05)×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 are significantly improved.

Embodiment 3

[0038] The current of atmospheric plasma spraying in Example 1 was changed to 450A, and other experimental conditions were the same. The resulting 80% WC-Co-10% Cu-10% BaF 2 / CaF 2 The friction coefficient of the coating is about 0.09, and the wear rate is about (3.1±0.08)×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 are significantly improved.

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Abstract

The invention discloses a self-lubricating abrasion-resistant coating. The coating comprises the following components in percentage by weight: 60-80% of tungsten cobalt carbide, 10-30% of copper and the balance of fluoride; the thickness of the coating is 100-500mu m. The preparation method of the self-lubricating abrasion-resistant coating comprises the following steps: a, ball milling and mixing tungsten cobalt carbide powder, copper powder and fluoride powder in an anhydrous ethanol medium, wherein the ball milling rotating speed is controlled at 100-150r / min and the mixing time is 24-48 hours; b, drying the mixed powder at 40-80 DEG C, carrying out vacuum sintering on the dried powder at a sintering temperature of 1000-1200 DEG C and carrying out heat preservation for 1-3 hours; c, crushing a block formed after sintering into powder of which the particle size is not more than 75mu m; and d, preparing the coating by using the powder obtained in the step c as a raw material by virtue of an atmospheric plasma spraying method.

Description

technical field [0001] The invention relates to a composite coating with self-lubricating and wear-resistant functions and a preparation method thereof, belonging 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 the material's performance. However, with the continuous increase of the working stress and working temperature of the material, the material often fails due to wear before reaching the limit of use. In the United States, losses due to wear and tear were estimated at $20 billion in 1985. [Budinski K. G., Surface Engineering for Wear Resistance. Prentice Hall. N. J. USA. 1988.] Costs from wear and corrosion are estimated at $200 billion. [Bernecki T. F.. Ceramic Industry. 1989, 10: 39.] In Germany, experts estimate that the annual loss due to wear and corrosion accounts for about 5% of the gross social product. [Lugscheider ...

Claims

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Application Information

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IPC IPC(8): C23C4/12C23C4/06C23C4/134
Inventor 袁建辉单张飞
Owner 郴州市泰益表面涂层技术有限公司
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