Method for preparing metallic-matrix ceramic coating by using laser cladding assisted by heat, sound and magnetic complex energy field

Abstract

The invention provides a method for preparing a metallic-matrix ceramic coating by using laser cladding assisted by a heat, sound and magnetic complex energy field. The method is characterized in that the high-performance non-defective metallic-matrix ceramic coating is prepared by adopting a multi-energy-field-assisted laser cladding method which combines induction heating with an electromagnetic-ultrasonic complex energy field; a base material is preheated in real time by a high-frequency induction heating device, meanwhile, an electromagnetic-ultrasonic complex energy field device is started and used for acting on a melting pool, and the induction heating device is used for carrying out slow cooling treatment on the coating again after cladding is finished; the effects of refining crystal grains and removing cracks and pores are achieved while the laser cladding efficiency and the powder utilization rate are improved; the high-performance cladding layer which is uniform in ceramic particle reinforced phase distribution and has a refined microstructure is finally obtained. By introducing the electromagnetic-ultrasonic complex energy field for acting on the laser melting pool, the high-performance cladding layer which is uniform in ceramic particle reinforced phase distribution, has a refined and uniform microstructure and is free from crack and pore defects can be obtained in an efficient and rapid induction heating-assisted laser cladding process.

Description

technical field [0001] The invention relates to the field of laser preparation of coatings on material surfaces, in particular to a method for assisting laser cladding of metal-based ceramic coatings by thermal, acoustic and magnetic composite energy fields. Background technique [0002] Laser cladding technology has broad application prospects in the fields of machinery, automobiles, aerospace and petrochemicals due to its advantages of fast cooling speed, low coating dilution rate, small thermal deformation and easy automation control. [0003] The metal-based ceramic material successfully combines the strength and toughness of the metal phase with the excellent wear resistance and corrosion resistance of the ceramic material to form a new composite material, which not only meets the requirements for the special properties of the material surface, but also saves A large number of precious elements are widely used in the surface modification layer of materials. Laser cladd...

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Problems solved by technology

[0007] Aiming at the problems existing in the existing methods, the present invention starts from the preparation process and proposes a method for laser cladding of metal-based ceramic coatings assisted by thermal, acoustic, and magnetic composite energy fields, which uses the combination of induction heating and electromagnetic-ultrasonic composite energy field The multi-energy field assisted laser cladding method is used to prepare high-performance defect-free metal-based ceramic coatings. The substrate is preheated in real time by a high-frequency induction heating device. When the preheating temperature is reached, the electromagnetic-ultrasonic composite energy field device is turned on. During the cladding process, the molten pool acts, and after the cladding is completed, the induction heating device is used to slowly cool the coating, so as to improve the laser cladding efficiency and powder utilization rate while refining the grain and eliminating cracks The purpose of obtaining a high-performance cladding layer with uniform distribution of ceramic particle reinforcement phase and fine microstructure

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