Method for carrying out nano ceramic coating laser cladding on surface of metal under assistance of ultrasonic fixed-point focusing

Abstract

The invention relates to a method for carrying out nano ceramic coating laser cladding on the surface of metal under assistance of ultrasonic fixed-point focusing. In a laser cladding process, fixed-point ultrasonic focusing is introduced to act on a bonding surface of a metal matrix and a nano ceramic powder layer, mutual diffusion of elements between the metal matrix and the nano ceramic powderlayer is promoted, so that good metallurgical bonding is formed between the metal matrix and the nano ceramic powder layer; meanwhile, the heat effect, the cavitation effect and the sound flow effectgenerated by ultrasonic focal points can promote formation of crystal nucleus and the fluidity of liquid meta, structure components are more uniform, the structure is more compact, and the strength,the wear resistance and other performances of a cladding layer are improved. The utrasonic fixed-point focusing is adopted, so that the defects that a traditional ultrasonic wave can only act on all molten pools and matrix, so that a cladding layer is thinned and diffuse to the periphery are overcome, the size of the bonding surface of the cladding layer and the matrix as well as the thickness ofthe cladding layer can be accurately controlled, in addition, the flexibility degree is high, and the method is suitable for various complex laser cladding processing environments.

Description

technical field [0001] The invention relates to a method for laser cladding a nano-ceramic coating on a metal surface assisted by ultrasonic fixed-point focusing, and belongs to the technical field of coating and surface modification. Background technique [0002] Nano-ceramic is a composite material manufactured by introducing nano-scale ceramic particles, whiskers, fibers, etc. into the ceramic matrix to improve the performance of the ceramic. Machining and superplasticity. Nano-ceramic materials have the advantages of high melting point, small thermal conductivity, high thermal expansion coefficient, and good thermal stability. They are one of the most widely used thermal barrier coating materials and are widely used in extreme environments in aerospace, marine chemical and other fields. [0003] Laser cladding technology is a branch of laser surface modification technology. It is a feasible surface modification technology that emerged with the development of high-power ...

AI Technical Summary

Problems solved by technology

Although it can reduce the generation of some cracks and improve the quality of the cladding layer, the material processing process is cumbersome and the cost of nanometer is high, which is not conducive to large-scale production and application.

[0006] The patent publication number is CN103114286A Chinese invention patent "A Method for Ultrasonic Assisted Laser Repairing Titanium Alloy". When using the method of this invention patent, the horn is directly applied to the substrate, and the ultrasonic vibration of the substrate drives the vibration of the titanium alloy. , a large amount of energy is lost, and the effect cannot be precisely controlled, and the effect of suppressing defects such as cracks and pores in the cladding layer on the titanium alloy surface is not obvious

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