A method of vacuum sintering method for laser cladding preparation coating process

Abstract

The vacuum sintering method of the present invention is used for the method of laser cladding preparation coating technology, take the high-speed cutting tool surface composite gradient coating example, the bottom layer is NiCrAlMo nickel-based self-fusing metal powder, and the transition layer is 60%NiCrAlMo+20%SiC+20 %C ceramic-based composite metal powder, the surface layer is 40%SiC+60%C (diamond) ceramic-based composite powder; the powder to be clad in paste or paste is printed on the surface of the substrate to be clad by screen printing and then sintered to form a preset layer. The ultrasonic vibrator and laser are aimed at the preset layer and melted at the same time to form a molten pool to form a coating, that is, a composite coating, and then annealing heat treatment for the composite coating. The invention can significantly prepare high-quality composite coatings, and is suitable for laboratory research of laser cladding composite coatings and the field of laser cladding composite coatings on the surface of metal parts 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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