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Preparation method of iron-based amorphous coating

A technology of iron-based amorphous and iron-based amorphous alloys, which is applied in the direction of coating, metal material coating technology, fusion spraying, etc., can solve the problems of limited application range, high coating porosity, high spraying cost, etc., to achieve Large application prospects, reduced spraying costs, high hardness effect

Inactive Publication Date: 2013-01-23
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In recent years, although some people have used plasma spraying, arc spraying and other thermal spraying methods to prepare amorphous coatings, but due to the high cost of spraying and the high porosity of the prepared coatings, its application range is limited.

Method used

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  • Preparation method of iron-based amorphous coating
  • Preparation method of iron-based amorphous coating
  • Preparation method of iron-based amorphous coating

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] First, the master alloy is prepared by vacuum induction melting according to the required composition, and the alloy composition is Fe 49.7 Cr 18 mn 1.9 Mo 7.4 W 1.6 B 15.2 C 3.8 Si 2.4 (at.%), the master alloy is put into the atomization furnace, and the amorphous alloy powder is prepared by gas atomization technology. The shape of the powder particles is as figure 1 . It can be seen that most of the powders are spherical and have good fluidity, which is suitable for thermal spraying. X-ray diffraction patterns of powder and coating as figure 2 shown. It can be seen from the figure that both the powder (<45 μm) and the coating are partially amorphous, and the degree of amorphization of the coating is relatively high.

[0030] The iron-based amorphous coating was prepared by the active combustion high-velocity gas (AC-HVAF) spraying process, and the particle size of the sprayed powder was 15-45 μm. The specific spraying process parameters are: air pressure ...

Embodiment 2

[0035] First, the master alloy is prepared by vacuum induction melting according to the required composition, and the alloy composition is Fe 55 Cr 16.2 mn 2.8 Mo 4.5 W 2.6 B 13.5 C 4.3 Si 1.1 (at.%), the master alloy is put into the atomization furnace, and the amorphous alloy powder is prepared by gas atomization technology. The iron-based amorphous coating was prepared by active combustion high-velocity gas (AC-HVAF) spraying process. The specific spraying process parameters are: air pressure 0.4MPa, primary combustion chamber pressure 0.3MPa, secondary combustion chamber pressure 0.2MPa, spraying distance 100mm, powder feeding rate 1rpm.

Embodiment 3

[0037] First, the master alloy is prepared by vacuum induction melting according to the required composition, and the alloy composition is Fe 47.9 Cr 18.8 mn 1.2 Mo 8.7 W 1.3 B 16.6 C 2.1 Si 3.4 (at.%), the master alloy is put into the atomization furnace, and the amorphous alloy powder is prepared by gas atomization technology. The iron-based amorphous coating was prepared by active combustion high-velocity gas (AC-HVAF) spraying process. The specific spraying process parameters are: air pressure 0.8MPa, primary combustion chamber pressure 0.6MPa, secondary combustion chamber pressure 0.4MPa, spraying distance 300mm, powder feeding rate 8rpm.

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Abstract

The invention provides a preparation method of an iron-based amorphous coating. Iron-based amorphous alloy powder is used as a raw material, and flame spraying is adopted to prepare the amorphous coating by activity combustion high speed fuel gas. The amorphous alloy powder contains the following elements and inevitable impurities: 16.0-19.0 of Cr; 1.0-3.0 of Mn; 4.0-9.0 of Mo; 1.0-3.0 of W; 13.0-17.0 of B; 2.5-4.5 of C; 1.0-3.5 of Si; and the balance of Fe. In the invention, preparation cost of the amorphous coating is reduced, the prepared iron-based amorphous coating and a substrate are bonded tightly, the structure is compact, the porosity and the oxygen content are very low, the iron-based amorphous coating has high hardness, excellent corrosion resistance and unique non-magnetism, thus the iron-based amorphous coating has a great application prospect in the field of ship, hydraulic, oil field development establishment, and nonmagnetic vessel hull; and because the content of B ishigher, the iron-based amorphous coating has favorable neutron absorption capacity, and can be used for a nuclear waste storage tank.

Description

Technical field: [0001] The invention relates to the field of iron-based amorphous alloys, in particular to a method for preparing an iron-based amorphous alloy coating. Background technique: [0002] Since its discovery, iron-based amorphous alloys have attracted much attention due to their ultra-high strength, low material cost, excellent soft magnetic properties, and good wear and corrosion resistance. However, due to the poor room temperature plasticity of iron-based amorphous alloys and the difficulty in preparing large-scale iron-based amorphous alloys, their application as structural materials is limited. Therefore, the application of amorphous alloys as coatings has become a promising research direction. [0003] There are many ways to prepare coatings. Compared with other preparation methods, such as chemical vapor deposition (CVD), physical vapor deposition (PVD), electroplating, electroless plating, brush plating, laser cladding, etc., thermal spraying prepares c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C23C4/08C23C4/129
Inventor 柳林郭瑞强张诚谌祺李宁
Owner HUAZHONG UNIV OF SCI & TECH
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