Iron-based amorphous nanocrystalline laser cladding composite coating, preparation method and test method

Abstract

The invention provides an iron-based amorphous nanocrystalline laser cladding composite coating, a preparation method and a test method. The cladding composite coating meets a molecular formula: FeaCobNicBdSiyNbe, wherein a, b, c, d, y and e represent the corresponding alloy element atomic percent: a is larger than or equal to 32 and less than or equal to 44, b is larger than or equal to 10 and less than or equal to 15, c is larger than or equal to 10 and less than or equal to 15, d is larger than or equal to 18 and less than or equal to 20, y is larger than or equal to 4 and less than or equal to 23, e is larger than or equal to 4 and less than or equal to 5, and a+b+c+d+y+e is equal to 100. The preparation method comprises the preparation steps of weighing the raw materials, mixing the raw materials to obtain alloy powder, pretreating a base plate, flatly spreading the alloy powder to the surface of the base plate, and using a laser beam to perpendicularly laser-clad the alloy powder. The composite coating has a certain amorphous content, high microhardness, excellent abrasive resistance and outstanding breaking strength; and the preparation process is simple, and the raw materials do not contain rare earth or volatile elements, so that the iron-based amorphous nanocrystalline laser cladding composite coating has broad application prospects.

Description

technical field [0001] The invention relates to an iron-based amorphous nanocrystalline laser cladding composite coating and a preparation and testing method, belonging to the technical field of new laser cladding composite materials. Background technique [0002] As a new surface modification technology, laser cladding can improve surface hardness, corrosion resistance and wear resistance by obtaining a layer of amorphous cladding coating on the surface of traditional materials. Its cost is low, so it has great potential application value. The use of laser cladding can enhance the surface strength and hardness of the device without affecting the strength and toughness of the base material, thereby greatly improving the overall comprehensive performance and service life of the material. In the field of heavy industry, laser cladding technology is an important means of repairing and strengthening parts, and has obvious economic benefits. [0003] Laser cladding coatings have...

AI Technical Summary

Problems solved by technology

In the process of laser cladding, under the action of high temperature, easily oxidized elemental elements such as Si and B will be burned. Since it is difficult to achieve vacuum conditions in industrial applications, the remaining metal elements will be oxidized to reduce the amorphous volume content of the cladding coating. and performance

In addition, most researchers prepare metal powders for cladding coatings by melting alloys and atomizing them, which increases the process flow and production costs.

[0004] Chinese patent CN106868496A discloses a preparation method of Fe-based amorphous coating, the alloy composition is: Cr: 17.3-19.4%; Mn: 1.8-2.2%; Mo: 12.9-15.8%; W: 5.0-6.2%; B : 2.8~4.1%; C: 0.7~1.1%; Si: 1.0~1.5%; the rest is Fe, and its hardness is 980~1180HV. The iron-based amorphous alloy is prepared into powder raw materials, which increases the difficulty of preparation and limits the scope of application

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