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Process for spraying composite coating on metal surface

A metal surface and composite coating technology, which is applied in the direction of metal material coating process, coating, fusion spraying, etc., can solve the problems of the decrease of fatigue performance of the base material, the adverse effect of the bonding strength of the coating and the substrate, etc., and achieve the reduction of inclusions The effect of avoiding the significant decline in the fatigue performance of the base material

Inactive Publication Date: 2015-07-22
上海市机械制造工艺研究所有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the sandblasting process, sand particles may be embedded in the surface of the workpiece substrate, which will adversely affect the bonding strength between the coating and the substrate
In addition, grit blasting roughening may cause sharp nicks on the surface leading to a significant decrease in the fatigue properties of the substrate

Method used

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  • Process for spraying composite coating on metal surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) After cleaning the surface of the 45# steel sample to be sprayed with acetone, the laser ablation treatment was performed on the surface of the 45# steel sample by short pulse Nd:YAG. The laser wavelength is 1064nm, the power is 80W, the frequency is 10HZ, and the number of laser pulses is 10-250.

[0027] (2) After the 45# steel sample was preheated, the WC-12% Co coating was prepared by detonation spraying on the surface of the sample. Explosive spraying process parameters are: the average particle size of the spraying material is 30-60 microns WC-12%Co mechanically mixed powder, oxygen flow: 42L / min, acetylene gas flow: 38L / min, nitrogen flow: 30L / min, oxygen acetylene The gas ratio is 1.1, the explosion frequency is 5 times / s, the spraying distance is 150mm, and the coating thickness is 0.05-0.3mm.

[0028] (3) The WC-12%Co coating on the surface of 45# steel sample prepared by detonation spraying process was remelted by semiconductor laser. Laser remelting pr...

Embodiment 2

[0031] (1) After cleaning the surface of the 316 stainless steel sample to be sprayed with acetone, the laser ablation treatment was performed on the surface of the 316 stainless steel with short pulse Nd:YAG. The laser wavelength is 1064nm, the power is 80W, the frequency is 10Hz, and the number of laser pulses is 10-250.

[0032] (2) After preheating the 316 stainless steel sample, detonation spraying was carried out on the surface of the sample to prepare Cr 3 C 2 -NiCr coating. Explosive spraying process parameters are: the spraying material is Cr with an average particle size of 30-60 microns 3 C 2 Mechanically mixed powder with NiCr, Cr 3 C 2 Powder accounts for 75%, NiCr powder accounts for 25%, oxygen flow rate: 42L / min, acetylene gas flow rate: 38L / min, nitrogen gas flow rate: 30L / min, oxygen acetylene gas ratio is 1.1, explosion frequency: 5 times / s, spraying distance : 150mm, the coating thickness is 0.05~0.3mm.

[0033] (3) The surface of 45# steel sample wa...

Embodiment 3

[0036] (1) After cleaning the surface of the 45# steel sample to be sprayed with acetone, the laser ablation treatment was performed on the surface of the 45# steel sample by short pulse Nd:YAG. The laser wavelength is 1064nm, the power is 80W, the frequency is 10HZ, and the number of laser pulses is 10-250.

[0037] (2) After preheating the 45# steel sample, detonation spraying was carried out on the surface of the sample to prepare Al 2 o 3 -Ni60 coating. The parameters of the detonation spraying process are: the spraying material is Al with an average particle size of about 40-80 microns 2 o 3 powder and 80-100 micron Ni60 powder mechanically mixed powder, where Al 2 o3 Powder accounts for 75%, Ni60 powder accounts for 25%, oxygen flow rate: 42L / min, acetylene gas flow rate: 38L / min, nitrogen gas flow rate: 30L / min, oxygen acetylene gas ratio is 1.1, explosion frequency: 5 times / s, spraying distance : 150mm, the coating thickness is 0.05~0.3mm.

[0038] (3) The surfac...

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Abstract

The invention discloses a process for spraying a composite coating on a metal surface. The process comprises the following steps: carrying out purification treatment on the metal surface; carrying out laser burning treatment on the metal surface; carrying out explosion spray treatment on the metal surface, and preparing the composite coating; carrying out laser re-melting treatment on the composite coating prepared by an explosion spray process, on the metal surface. According to the combined process for spraying the composite coating on the metal surface, the explosion spray process is compounded with two laser heat treatment processes, so that the binding force of the coating and a matrix can be effectively improved, and the performances of corrosion resistance, wear corrosion and the like of the coating can be further improved.

Description

technical field [0001] The invention relates to a metal material heat treatment process, in particular to a metal material surface strengthening treatment process. Background technique [0002] Explosive spraying technology was born in the 1950s. It was invented by researchers from Praxair Surface Technologies (formerly Union Carbide Linde Branch), and it is called D-GUN for short. Explosive spraying technology is one of the thermal spraying technologies. Before the invention of explosive spraying technology, due to the low bonding strength and high porosity of coatings prepared by traditional thermal spraying technology, aero-engine manufacturers did not use thermal spraying technology to prepare related coatings. It is precisely because of the emergence of explosive spraying technology that it has greatly promoted the application of other thermal spraying processes, including plasma spraying, in aerospace and nuclear industries. The explosive spraying process includes wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/12C23C4/18C23C4/10C23C4/06C23C4/126
Inventor 王超蔡红马佳明姜卓
Owner 上海市机械制造工艺研究所有限公司
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