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Coupled coating with high strength and high toughness and preparation method thereof

A high-toughness, high-strength technology, applied in the direction of coating, metal material coating process, fusion spraying, etc., to achieve the effect of simple equipment and process, improved strength and toughness, and improved bonding state

Inactive Publication Date: 2017-05-31
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

The existing research results prove that the preparation of nanoparticle-reinforced metal matrix composite nanocoatings by traditional thermal spraying process is a simple and effective method to improve the wear resistance of coatings. However, the work in this area is still mainly focused on Nano-reinforced particles are added inside a single spray powder particle, and there are few studies on the use of nanoparticles for strengthening from the interface of flat particles

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  • Coupled coating with high strength and high toughness and preparation method thereof
  • Coupled coating with high strength and high toughness and preparation method thereof
  • Coupled coating with high strength and high toughness and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] In this example, the commercially available WC-Co powder (with a particle size of about 30 μm) is used for the micron powder, and the commercially available WC powder (with a particle size of about 80 nm) is used for the nano-powder. The proportion of the nano-powder in the micro / nano coupling powder is 5wt%, the thickness of the coating is about 200 μm, and the specific preparation method of the coating is as follows:

[0040] 1. Use deionized water as a solvent, add 2wt% PVP as a binder, and add 5wt% coupling powder to configure a slurry. Add balls according to the ball-to-material ratio of 20:1. The ball milling speed is 150r / min, and the ball milling time is 4h, spray granulation within 1 hour after the completion of ball milling, the atomization gas is compressed air during granulation, the pressure is 0.3MPa, the slurry delivery rate is 15ml / min, the drying temperature is 200°C, take 150-500 mesh sieve The powder between the nets is the raw material for thermal sp...

Embodiment 2

[0047] In this example, the specific preparation method of the micro / nano coupling coating is basically the same as that in Example 1, except that the proportion of nano powder in the coupling powder is 3wt%.

[0048] The micro / nano-coupling coating prepared above was subjected to the following performance tests:

[0049] 1. Microhardness of the coating: The average hardness of the coating measured by the coating microhardness test method is 1275.4HV (74.7HRC).

[0050] 2. Coating wear rate: using the coating friction and wear test method, the measured coating wear rate is 5.52×10 -7 mm 3 / N·m, the results show that the wear resistance of the coating is better than that of the conventional coating.

Embodiment 3

[0052] In this example, the specific preparation method of the coupling coating is basically the same as that in Example 1, the difference is that the powders used are micron Al 2 o 3 (particle size about 50μm) and nano-Al 2 o 3 (particle size about 30nm) powder.

[0053] The micro / nano-coupling coating prepared above was subjected to the following performance tests:

[0054] 1. Microhardness of the coating: The average hardness of the coating measured by the coating microhardness test method is 1075.4HV (70.7HRC).

[0055] 2. Coating wear rate: using the coating friction and wear test method, the measured coating wear rate is 6.52×10 -7 mm 3 / N·m, the results show that the wear resistance of the coating is better than that of the conventional coating.

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Abstract

The invention discloses a coupled coating with high strength and high toughness and a preparation method of the coupled coating. The method comprises the steps that micron powder and nano powder are used as raw materials, a wet milling method and a spray granulation method are adopted for preparing micron / nano coupled powder, and a hot spraying method is adopted for preparing the micron / nano coupled coating with nano particles evenly distributed at the flat particle interface. According to the prepared coating, the problems that nano powder is difficult to convey, prone to ablation and the like in a heat spraying process are solved, the combining state at the flat particle interface in the heat spraying coating is improved (the combining rate is improved), the stress state at the interface is optimized, the strength and toughness of the coating are remarkably improved, the purpose of improving the abrasion resistance of the coating is achieved, the method process is simple, and the coating materials are wide in selection range, excellent in performance, applicable to preparing a novel component surface coating and also capable of being used for repairing waste components.

Description

technical field [0001] The invention relates to the technical field of surface treatment of parts, in particular to a micro / nano coupling coating with high strength and high toughness and a preparation method thereof. Background technique [0002] According to statistics, 1 / 3 to 1 / 2 of energy is consumed by friction and wear, and about 80% of machine parts in my country fail due to wear, and the annual loss due to friction loss is more than 100 billion yuan. . Thermal spray coatings are widely used in the fields of surface strengthening of key parts of mechanical equipment and repair of size and precision. Affected by the characteristics of the thermal spraying process itself, the shortcomings of the coating, such as many internal cracks, weak bonding, and low density, seriously affect the performance of the coating. Therefore, how to further improve the wear resistance of the thermal spraying coating is still the most important issue at present. One of the challenges of co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/04C23C4/129C23C4/06C23C4/10
CPCC23C4/04C23C4/06C23C4/12
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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