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High-energy auxiliary spraying method and spraying system

A high-energy, thermal spraying technology, applied in the direction of coating, fusion spraying, metal material coating process, etc., can solve the problems of increased time cost, expensive maintenance costs, optical fiber burning, etc., to achieve improved bonding strength and simple disassembly Effect

Pending Publication Date: 2021-04-16
JIHUA LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, although thermal spraying technology can be used to prepare various metal and alloy coatings, ceramic coatings, etc., there are obvious pores inside the coating, so it has an adverse effect on the performance of the coating. Although cold spraying technology can prepare A denser coating is produced, but since the coating relies on plastic deformation for deposition, when spraying a powder with poor plastic deformation ability, more obvious pores will appear inside the coating
This limits the further wide application of coating technology, so there is an urgent need for a method that can improve the coating density.
[0005] At present, laser remelting technology can be used to remelt the coating due to the high porosity of the coating. Insufficient cooling speed leads to fiber burnout, which leads to expensive maintenance costs; plasma arc is relatively low cost, and can assist thermal spraying technology to prepare ceramic-metal-based coatings, but the current application range is narrow, and the plasma arc has no effect on the post-spraying process. The coating has been remelted, and no real-time processing plan has been proposed, which reduces production efficiency and increases time costs

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Effect test

Embodiment approach 1

[0082] First, prepare SS316L powder with a particle size range of 10-50 μm. The substrate for spraying is SS316L. First, a coating with a thickness of about 600 μm is prepared on the substrate by cold spraying technology. The spraying process parameters are: pressure 4 MPa, temperature 650 ° C, spraying distance 20mm, the spray gun moving speed is 1000mm / min. After the coating is prepared, a fiber laser with a power of 5KW is used to remelt the coating to obtain a dense coating.

Embodiment approach 2

[0084] First, prepare In625 powder with a particle size of -300 mesh, and the spraying substrate is In718, and fix the plasma arc spray gun and the cold spray gun on the mechanical arm together. First adjust the parameters of the plasma arc spray gun to preheat the substrate, and then spray, so that the particles are deposited on the preheated substrate. The cold spray process parameters are: pressure 4.5MPa, temperature 750°C, spray distance 20mm, The moving speed of the spray gun is 1000mm / min; after the coating is deposited on the substrate, the spraying is continued so that it gradually grows into a bulk material.

[0085] The high-energy heat source assisted spraying device and method proposed in the above embodiments can reduce the pores inside the coating by remelting, improve the bonding strength of the coating, so that it can reach the level of metallurgical bonding, and improve the wear resistance of the coating , anti-corrosion and other properties, especially suita...

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Abstract

According to the high-energy auxiliary spraying method and spraying system, a matrix is pretreated; the surface of the matrix is provided with a coating by adopting a spraying way; the coating is remolten; or the surface of the matrix is provided with a coating by adopting a spraying way, and the coating is remolten in real time during spraying. According to the the high-energy auxiliary spraying method and spraying system provided by the invention, a deposited coating is subjected to remelting treatment by energy generated by a high-energy heat source, or the matrix or the deposited coating is subjected to real-time remelting treatment during spraying, so that the porosity (lower than 0.1%) of the coating or the deposited body is reduced, and the bonding strength is significantly improved (higher than 70 MPa); the heat source can be replaced according to different types of spraying materials; and the disassembly is simple.

Description

technical field [0001] The invention relates to the technical field of surface engineering, in particular to a high-energy auxiliary spraying method and a related spraying operating system. Background technique [0002] The preparation of a functional coating of a certain shape and size (such as corrosion resistance, wear resistance, heat insulation, etc.) on the surface of the substrate can protect the surface of the substrate. At present, the technologies for preparing coatings mainly include thermal spraying technology, cold spraying technology, vapor deposition and other processes. For vapor deposition technology, although the consumables are less and the film formation is dense and uniform, the film formation speed is slow and the thickness is very limited, generally not exceeding 100 μm. Thermal spraying technology includes plasma spraying, supersonic flame spraying, arc spraying and explosive spraying, etc. During the spraying process, the powder or wire is heated to...

Claims

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Application Information

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IPC IPC(8): C23C4/18C23C4/12C23C24/04
Inventor 卢静孙澄川吴应东解路但幸东汤烈明李挺
Owner JIHUA LAB