Iron-based amorphous nanocrystalline composite coating and preparation method thereof

Abstract

The invention discloses an iron-based amorphous nanocrystalline composite coating and a preparation method of preparing the iron-based amorphous nanocrystalline composite coating by adopting a plasma surfacing method. Alloy powder which is prepared according to the specified proportion is subjected to surfacing on the surface of a base material by adopting a plasma surfacing machine to form an alloy coating, wherein the technical parameters comprise: the welding voltage is 25-30 V, the welding current is 140-190 A, the welding speed is 35-40 mm/min, the shielding gas flow is 10-12 L/min, the powder feed speed is 15-25 g/min and the amplitude of swing is 20-30 mm. when the plasma surfacing ends, after the coating is naturally cooled to the room temperature, the preparation of the iron-based amorphous nanocrystalline composite coating is completed. The iron-based amorphous nanocrystalline composite coating which is prepared by the plasma surfacing method is high in rigidity and good in wear-resisting property and can be widely applied to manufacturing and repair of metallurgical machinery and petrochemical engineering apparatuses. In addition, the coating prepared by the plasma surfacing method has the advantages that the technology is simple; the operation is simple and easy; no preheating before welding and no slow cooling after welding are needed; after surfacing, the coating has no cracks and no peeling, and the forming of the coating is excellent.

Description

technical field [0001] The invention belongs to the technical field of coating materials, in particular to an iron-based amorphous nanocrystalline composite coating and a preparation method thereof. Background technique [0002] Fracture, corrosion and wear are the three main ways for metal materials to fail, and the most serious loss is the wear of materials, accounting for about 50% of the total consumption. Failures caused by various wear and corrosion often occur on the surface of materials and their components. In order to prevent some parts working under conditions of high speed, high temperature, high pressure, heavy load, and corrosive media, the entire part will be scrapped due to local damage on the surface. , in order to improve the reliability of parts and prolong their service life, researchers have developed a large number of practical, advanced and efficient surface engineering technologies to repair or strengthen the surface of parts, and prepare a thin layer...

AI Technical Summary

Problems solved by technology

However, the bonding strength between the amorphous coating and the substrate prepared by these methods is weak, and the thickness of the coating is too thin, which limits its development and application to a certain extent.

[0004] At present, the preparation methods of amorphous coatings reported in domestic and foreign patents are more thin coatings prepared by thermal spraying, laser cladding and other methods, while the surfacing method is relatively difficult to obtain amorphous coatings due to the low cooling rate in the process. Larger, making fewer patent reports in this area

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