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Preparation method for quasi-nanostructure WC-Co (tungsten-cobalt) coating with high compactness and low decarburization

A dense, quasi-nano technology, used in coatings, metal material coating processes, melt spraying, etc., can solve problems such as increased fuel consumption, reduced powder deposition efficiency, and extended process routes, achieving low decarburization, improved Density, simple and easy-to-implement effect

Active Publication Date: 2014-06-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods can improve the performance of nanostructured coatings to a certain extent, but at the same time directly cause a great increase in fuel consumption, and lead to new insurmountable problems such as a significant decrease in powder deposition efficiency and a significant extension of the process route.

Method used

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  • Preparation method for quasi-nanostructure WC-Co (tungsten-cobalt) coating with high compactness and low decarburization
  • Preparation method for quasi-nanostructure WC-Co (tungsten-cobalt) coating with high compactness and low decarburization
  • Preparation method for quasi-nanostructure WC-Co (tungsten-cobalt) coating with high compactness and low decarburization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] WC-12Co composite powder with an average particle size of 80nm and Cr with a mass fraction of 0.60% 3 C 2 The powder and VC powder with a mass fraction of 0.40% were mixed for ball milling, using absolute ethanol as the ball milling medium, and the ball milling time was 15 hours. After ball milling, it was dried in a vacuum oven at a temperature of 80°C for 15 hours. Then, the mixed powder after ball milling was spray-dried, granulated and heat-treated. First, it was raised from room temperature to 300°C at a heating rate of 3°C / min, and kept at 300°C for 1 hour; then it was raised to 800°C at a heating rate of 5°C / min. min, hold at 800°C for 1 hour; then raise to 1240°C with a heating rate of 7°C / min, and hold at 1240°C for 3 hours; then cool down to 400°C, control the cooling rate at 5°C / min, and finally cool to room temperature with the furnace, Keep the argon atmosphere in the furnace; for the granulated powder after heat treatment (such as figure 1 a) Sieve and c...

Embodiment 2

[0021] WC-12Co composite powder with an average particle size of 150nm and Cr with a mass fraction of 0.80% 3 C 2 The powder and VC powder with a mass fraction of 0.56% were mixed for ball milling, using absolute ethanol as the ball milling medium, and the ball milling time was 12 hours. After ball milling, it was dried in a vacuum oven at a temperature of 90°C for 12 hours. Then, the mixed powder after ball milling was spray-dried, granulated and heat-treated. First, it was raised from room temperature to 300°C at a heating rate of 3°C / min, and kept at 300°C for 1 hour; then it was raised to 800°C at a heating rate of 5°C / min. min, hold at 800°C for 1 hour; then raise to 1260°C with a heating rate of 7°C / min, and hold at 1260°C for 2 hours; then cool down to 400°C, control the cooling rate at 5°C / min, and finally cool to room temperature with the furnace, Keep the argon atmosphere in the furnace; for the granulated powder after heat treatment (such as figure 1 b) Sieve and ...

Embodiment 3

[0023] WC-12Co composite powder with an average particle size of 200nm and Cr with a mass fraction of 1.20% 3 C 2 The powder was mixed with VC powder with a mass fraction of 0.9% for ball milling, using absolute ethanol as the ball milling medium, and the ball milling time was 10 hours. After ball milling, it was dried in a vacuum oven at 100°C for 10 hours. Then, the mixed powder after ball milling was spray-dried, granulated and heat-treated. First, it was raised from room temperature to 300°C at a heating rate of 3°C / min, and kept at 300°C for 1 hour; then it was raised to 800°C at a heating rate of 5°C / min. min, hold at 800°C for 1 hour; then raise to 1280°C with a heating rate of 7°C / min, and hold at 1280°C for 1 hour; then cool down to 400°C, control the cooling rate at 5°C / min, and finally cool to room temperature with the furnace, Keep the argon atmosphere in the furnace; for the granulated powder after heat treatment (such as figure 1 c) Sieve and classify, and comb...

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Abstract

The invention discloses a preparation method for a quasi-nanostructure WC-Co (tungsten-cobalt) coating with high compactness and low decarburization, and belongs to the technical field of preparation of WC-Co coatings. The preparation method comprises the steps as follows: firstly, preparing superfine and nanometer WC-Co compound powder with average particle size of 80-400 nm; secondly, mixing the WC-Co compound powder with Cr3C2 and VC powder according to a certain ratio, carrying out ball milling and drying to obtain mixed powder, granulating, and carrying out heat treatment; and thirdly, sieving for grading, combining into spraying powder with special particle size distribution, and spraying by adopting supersonic flame spraying equipment. The quasi-nanostructure WC-Co coating prepared by the method has the characteristics of high compactness and low decarburization.

Description

technical field [0001] The invention belongs to the technical field of preparation of WC-Co coatings, in particular to a preparation method of quasi-nanometer structure WC-Co coatings with high compactness and low decarburization. Background technique [0002] Compared with the micron-sized (>1μm) coarse powder WC-Co thermal spray coating widely used in domestic and foreign industrial fields, due to the special small size effect and surface effect of nano-powder, the melting point of powder particles is lowered, and the powder's The flatness is effectively improved, and the prepared quasi-nanometer structure (<200nm) cemented carbide coating should theoretically have higher density, hardness and wear resistance. However, at present, nanostructured WC-Co coatings have not been widely used in the industrial field, mainly due to the following reasons: First, the raw materials of nanoscale WC-Co powder required for the preparation of coatings are expensive, resulting in th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/10B22F1/00C23C4/06C23C4/129
Inventor 宋晓艳王海滨王瑶聂祚仁郭广生
Owner BEIJING UNIV OF TECH
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