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Metal coating with high bonding strength and high cohesion strength, as well as thermal spraying method and application of metal coating

A technology of bonding strength and cohesive strength, applied in metal material coating process, metal processing equipment, coating and other directions, can solve the problems of inability to achieve particle temperature self-bonding effect and weak bonding, and achieve overall structural stability and thermal stability. Enthalpy increase, the effect of increasing the heating rate

Active Publication Date: 2016-05-25
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the weak bonding between the cladding layer and the cladding layer, the phenomenon of separation between the cladding layer and the internal cladding alloy occurs during the heating process. On the one hand, the deposition of the cladding layer with a high melting point cannot be fully developed. The effect of increasing the temperature of the particles, so simple coating cannot achieve a significant increase in the temperature of the particles to obtain a sufficient self-bonding effect

Method used

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  • Metal coating with high bonding strength and high cohesion strength, as well as thermal spraying method and application of metal coating
  • Metal coating with high bonding strength and high cohesion strength, as well as thermal spraying method and application of metal coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Mo-coated Ni20Cr shell-core composite structure powder particle cross-section such as figure 1 shown. as figure 1 The shown Mo coated spherical Ni20Cr powder with a particle size between 75-100 μm is used as a plasma spray powder. , Prepared after 30min protective atmosphere heat treatment. Then deposit a coating on the surface of the stainless steel substrate under the plasma arc power of 30-38kW, and the cross-sectional structure of the coating is as follows figure 2 As shown in (c), figure 2 (a) For comparison, the cross-section structure of the pure Ni-20Cr alloy coating prepared under the same plasma spraying conditions, figure 2 (b) As a comparison, the cross-sectional structure of Mo simple mechanical coating NiCr alloy coating prepared under the same conditions. and figure 2 (a) with figure 2 The conventional plasma spraying Ni20Cr coating shown in (b) is compared with the coating prepared by Mo mechanically coating NiCr powder, the density of the Ni...

Embodiment 2

[0033] Mo coated Ni60 powder with a particle size of 75-150 μm was used, and after being treated at 700 ° C for 6 hours, a composite structure powder was obtained; the composite structure powder was deposited on the surface of a low-carbon steel substrate at a plasma arc power of 35 kW, and the coating thickness of about 400 μm was obtained. The tensile strength of the coating was tested according to the ASTMC633 standard. The results showed that all the samples were broken at the adhesive layer, and the average strength was 72MPa, indicating that the bonding strength and cohesive strength of the coating were both greater than 72MPa.

Embodiment 3

[0035] Use Ni-coated Zn powder with a particle size of 45-110 μm and a mass ratio of 15 / 85, and treat it at 900 ° C for 4 hours to obtain a composite structure powder; the composite structure powder is flame sprayed on the surface of the Mg alloy substrate to prepare a thickness of ~ 250 μm The Ni-Zn alloy coating was tested according to the ASTMC633 standard to test the tensile strength of the coating. The results showed that all samples were broken at the adhesive layer, and the average strength was 68MPa, indicating that the bonding strength and cohesive strength of the coating were both greater than 68MPa.

[0036] In summary, the method of the present invention aims at the problem that it is difficult or impossible to realize the metallurgical self-bonding reaction in the collision deposition process of molten particles and obtain a sufficiently dense coating with good inter-particle bonding by using the existing sprayed metal alloy powder materials. A method of coating po...

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Abstract

The invention discloses a metal coating with high bonding strength and high cohesion strength, as well as a thermal spraying method and application of the metal coating, and belongs to the technical field of material processing. The thermal spraying method comprises the following steps of forming compound structural powder by coating low-melting-point metal particles with high-melting-point metal; depositing a coating on the matrix surface by using the compound structural powder as thermal spraying powder by plasma or flame thermal spraying method to prepare the metal coating with high bonding strength and high cohesion strength. The metal coating with high bonding strength and high cohesion strength prepared by the method has high carrying capability due to the remarkably enhanced interface bonding, and the excellent abrasion resistance of the coating material can be achieved; since run-through pore does not exist, corrosive medium can be completely isolated and is prevented from reaching the coating and matrix interface from the coating surface, and the excellent corrosion resistance of the coating material can be achieved. The metal coating can be used as an alloy coating, and can also be used as a bonding layer or foundation layer of other coating materials.

Description

technical field [0001] The invention belongs to the technical field of material processing, and relates to a metal coating with high bonding strength and cohesive strength and a thermal spraying preparation method and application thereof. Background technique [0002] Plasma spraying and flame spraying are important methods for preparing metal alloy coatings and improving the service performance of metal materials. Coatings are usually prepared using powdered material as an initial feed. When preparing the coating, the powder is sent into a heat source such as a plasma jet, heated to a molten or nearly molten state, and then collides and accumulates on the surface of the substrate to form a coating. Therefore, the coating is formed by the accumulation of disc-shaped particles formed by the deformation of the particles in the molten or semi-molten state, and has a layered structure. The interface bonding state between the particle layers in the coating significantly affects ...

Claims

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Application Information

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IPC IPC(8): C23C4/134C23C4/129C23C4/08B22F1/02
CPCC23C4/08B22F1/17
Inventor 李长久田佳佳李成新雒晓涛杨冠军
Owner XI AN JIAOTONG UNIV
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