Cored wire for electric arc spraying of amorphous and nano-crystalline anti-cavitation coating layer

A technology of amorphous nanocrystalline and powder core wire, which is applied in coating, metal material coating process, fusion spraying, etc.

Inactive Publication Date: 2011-09-14
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at problems such as cavitation wear of key flow-passing parts of hydraulic machinery, the invention provides a powder core wire material for arc spraying amorphous nanocrystalline anti-cavitation coating, and the coating is prepared by high-speed arc spraying the wire material Compact structure, porosity 0.1 , has excellent anti-cavitation wear performance, and low cost

Method used

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  • Cored wire for electric arc spraying of amorphous and nano-crystalline anti-cavitation coating layer
  • Cored wire for electric arc spraying of amorphous and nano-crystalline anti-cavitation coating layer
  • Cored wire for electric arc spraying of amorphous and nano-crystalline anti-cavitation coating layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A low-carbon steel strip of 14×0.3mm (width 14mm, thickness 0.3mm) is selected. Tie it into a U shape first. Take four kinds of metal alloy powders according to mass percentage: 4% boron, 5% silicon, 5% phosphorus, 3% nickel, balance Fe, carry out weighing batching. Put the taken powder into the powder mixer and mix for 30 minutes, then put the mixed powder into the U-shaped low-carbon steel belt groove, and the filling rate is 38%. Then the U-shaped groove is closed, so that the powder is coated in it, and then the diameter is gradually reduced to Φ2mm through the wire drawing die. The finished wire is wound into a disc shape required by the factory, and after being measured and packaged, it becomes a product that can be shipped. The arc spray coating was prepared on the steel substrate roughened by sandblasting, the spraying voltage was 36V, the spraying current was 120A, the spraying distance was 200mm, and the spraying air pressure was 0.7MPa.

[0019] The X-ray ...

Embodiment 2

[0024] A low-carbon steel strip of 14×0.3mm (width 14mm, thickness 0.3mm) is selected. Tie it into a U shape first. Take four kinds of metal alloy powders according to mass percentage: 6% boron, 7% silicon, 7% phosphorus, 5% nickel, balance Fe, carry out weighing batching. Put the taken powder into the powder mixer and mix for 30 minutes, then put the mixed powder into the U-shaped low-carbon steel belt groove, and the filling rate is 40%. Then close the U-shaped groove so that the powder is coated in it, and then gradually reduce the diameter to Φ2mm finished wire through the wire drawing die. The finished wire is wound into a disc shape required by the factory, and after being measured and packaged, it becomes a product that can be shipped. The arc spray coating was prepared on the steel substrate roughened by sandblasting, the spraying voltage was 36V, the spraying current was 110A, the spraying distance was 200mm, and the spraying air pressure was 0.6MPa. The amorphous ...

Embodiment 3

[0026] A low-carbon steel strip of 14×0.3mm (width 14mm, thickness 0.3mm) is selected. Tie it into a U shape first. Take four kinds of metal alloy powders according to mass percentage: 2% boron, 3% silicon, 2% phosphorus, 2% nickel, balance Fe, carry out weighing batching. Put the taken powder into the powder mixer and mix for 30 minutes, then put the mixed powder into the U-shaped low-carbon steel belt groove, and the filling rate is 32%. Then close the U-shaped groove so that the powder is coated in it, and then gradually reduce the diameter to Φ2mm finished wire through the wire drawing die. The finished wire is wound into a disc shape required by the factory, and after being measured and packaged, it becomes a product that can be shipped. The arc spray coating was prepared on the steel substrate roughened by sandblasting, the spraying voltage was 34V, the spraying current was 120A, the spraying distance was 200mm, and the spraying air pressure was 0.7MPa. The amorphous ...

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Abstract

The invention discloses a cored wire for electric arc spraying of an amorphous and nano-crystalline anti-cavitation coating layer. The cored wire is prepared from a low-carbon steel casing coated cored wire, and the powdered core is obtained by mixing four types of metal alloy powder. The cored wire is characterized in that the powdered core comprises the following chemical components in percentage by mass: 2 to 6 percent of boron, 3 to 7 percent of silicon, 2 to 7 percent of phosphorus, 2 to 5 percent of nickel, and the balance of Fe. The preparation method of the cored wire comprises the following steps of: rolling a low-carbon steel strip into a U shape, and adding alloy powder which accounts for 30 to 40 percent of the total weight of cored wire into a U-shaped groove; healing up the U-shaped groove to enwrap the powder in the groove; gradually drawing and reducing the diameter through a wire-drawing die to ensure that the final diameter of the cored wire is 2.0 mm; and forming an amorphous and nano-crystalline coating layer on a cooled steel substrate by adopting a high-speed electric arc spraying technique, wherein the coating layer is compact in organization structure and high in thermal stability, the porosity is less than 3 percent, the amorphous content is more than or equal to 70 percent, the bonding strength of the coating layer is more than or equal to 45 MPa, and the average hardness is more than or equal to 1,000 HV0.1, so the cored wire can significantly improve the anti-cavitation performance of key flow passage components of hydraulic machinery.

Description

technical field [0001] The invention relates to a powder core wire material used for arc spraying an amorphous nanocrystal anti-cavitation coating, and belongs to the field of professional thermal spraying of material processing engineering. It is mainly used as an arc spraying material for the preparation of high-performance amorphous and nanocrystalline coatings, and is applied to the anti-cavitation performance of key flow-through parts of hydraulic machinery. Background technique [0002] my country has abundant hydropower resources, and hydropower is a kind of green energy. The development of hydropower is of great significance to our country. However, the rivers in our country have a large amount of sediment, and most of the turbines are designed according to the conditions of clean water in foreign countries. Under the condition of muddy water with sediment, the wear of the blades of the turbine is 20-50 times that of the clean water. In such an environment, on the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/06C23C4/131
Inventor 王泽华程江波周泽华江少群王刚林尽染
Owner HOHAI UNIV
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