Method for laser cladding coating preparing process by using vacuum sintering method

Abstract

The invention relates to a method for a laser cladding coating preparing process by using a vacuum sintering method. Taking a high-speed cutting cutter surface composite gradient coating as an example, a bottom layer is NiCrAlMo nickel-based self-fusing metal powder; a transition layer is 60% of NiCrAlMo + 20% of SiC +20% of C ceramic-based composite metal powder; a surface layer is 40% of SiC +60% of C (diamond) ceramic-based composite powder; paste-like to-be-clad powder is printed on the surface of a to-be-clad base material through a silk screen and is then sintered to form a preset layer;and an ultrasonic vibrator and a laser are simultaneously aligned with the preset layer for melting to generate a molten pool and form a coating, namely, a composite coating is formed, and then the composite coating is subjected to annealing heat treatment. By means of the method, the high-quality composite coating can be prepared. The method is suitable for laboratory research of a laser cladding composite coating and the field of metal part surface laser cladding composite coatings with complex shapes and high technical requirements.

Description

Technical field: [0001] The invention relates to a method for preparing a coating by laser cladding with a vacuum sintering method. Background technique: [0002] Laser cladding is an important laser surface modification technology. Its feeding methods include preset powder layer and synchronous powder supply. Preset powder supply includes direct preset, cold press preset, bonding preset, spraying preset Synchronous powder feeding includes coaxial powder feeding and lateral powder feeding. Generally, gas flow is used as the carrier of powder feeding. For mixed powder, especially when the particle density and size differ greatly, the mixing uniformity is poor. . Although the high degree of automation makes synchronous powder feeding widely used in industrial mass production, it also has disadvantages such as fluidity is restricted by powder fluidity, powder pollutes the powder feeder, and mixed powder is difficult to mix uniformly. Therefore, in the scientific research of l...

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Problems solved by technology

[0003] In addition, similar patent applications were retrieved, such as application number: CN201721503538; patent name: a platform leveling structure for laser powder sintering technology; application number: CN201910100334; patent name: a method and device for additive manufacturing of metal parts And application number: CN201811631548; patent name: a selective laser sintering rapid prototyping device; application number: CN200910186673; patent name: laser induction composite cladding gradient functional thermal barrier coating method; application number: CN201210097330.8; patent name : A method for obtaining a composite coating by presetting powder by extrusion method for laser cladding; CN201510918486; Patent name: A method for preparing a modified composite Hf-Ta metal coating by laser cladding; it is known from the above patent application that laser cladding The application of technology aims to improve the wear resistance and corrosion resistance, high temperature oxidation resistance and biocompatibility of the substrate surface, that is, it is mainly used for the preparation of surface coatings, and most of the surface coatings are composite coatings and other multi-layer coatings. The preparation of phase coating is the main method, which requires a high-precision synchronous powder feeder capable of transporting two or more powders. However, due to the defects of the powder feeding mechanism itself, the existing synchronous powder (or two or more) powders or smaller particle size powders are difficult to meet the technical requirements, and there are serious powder waste and low coating quality in the cladding process, so it is rare in the field of laser cladding to prepare composite coatings. As we all know, because the preset method is basically not limited by the type of powder and the size of the powder particle size, it can flexibly and conveniently add the required powder to the molten pool, so it is widely used in the research field of laser cladding to prepare composite coatings.

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