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Iron-based amorphous nanocrystalline composite coating and preparation method thereof

A nanocrystalline composite, iron-based amorphous technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problem of weak bonding strength between amorphous coating and substrate, difficulty in coating Thin layer thickness and other problems, to achieve the effect of easy operation, good coating formation and little splash

Active Publication Date: 2016-01-06
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Iron-based amorphous nanocrystalline composite coating and preparation method thereof
  • Iron-based amorphous nanocrystalline composite coating and preparation method thereof
  • Iron-based amorphous nanocrystalline composite coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] (1) Preparation of alloy powder for plasma surfacing:

[0030] The pure metal Fe, Cu, Si, Mn used in industry and Fe-Ni, Fe-Nb, Fe-B, Fe-C alloy used in industry are divided into Fe 70.89 Ni 1.37 Cu 1.34 Nb 3.1 B 18.77 C 2.75 Si 1.01 mn 0.77 , (atomic percentage, at%) for raw material configuration, after the prepared metal raw material is melted and refined in a vacuum induction furnace, the molten metal liquid is poured into an insulated crucible, and enters a draft tube and a nozzle, at this time the melt The stream is atomized by the high pressure gas stream. The atomized metal powder solidifies and settles in the atomizing tower, and falls into the powder collecting tank;

[0031] (2) 35CrMo steel is selected as the base material, and the oxide removal and surface cleaning are carried out on the surface of the base material in sequence before plasma surfacing. Among them, the oxide removal adopts the grinding method until the metallic luster is exposed; the...

Embodiment 2

[0036] Step (1), step (2) and step (4) are all identical with embodiment 1, only adjust the process parameter of plasma overlay welding in step (3) as follows: welding voltage 28V, welding current 150A, welding speed 35mm / min, The protective airflow speed is 12L / min, the powder feeding speed is 25g / min, and the swing range is 26mm.

[0037] Performance evaluation:

[0038] The following iron-based amorphous nanocrystalline composite coatings prepared in Example 1 and Example 2 are evaluated by microstructure test and observation, crack resistance test, hardness test and wear resistance test respectively:

[0039] (1) The iron-based amorphous nanocrystalline composite coatings prepared in Example 1 and Example 2 can be seen from the macroscopic appearance, the coating is well formed, and the coating has no cracks; and after the coloring penetrant inspection, it is found that the coating has no cracks , indicating that the coating has good crack resistance.

[0040](2) In orde...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C45/02C23C4/06C23C4/12
Inventor 李峰伟杜平王益山魏刚向东张会权檀惊涛贾军周文华左运峰
Owner BC P INC CHINA NAT PETROLEUM CORP
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