A high thermal stability iron-based amorphous coating and its preparation method

A high thermal stability, iron-based amorphous technology, applied in coating, metal material coating process, melt spraying and other directions, can solve the problem of losing the properties of amorphous metal materials, achieve thermal stability, wide application Foreground, high hardness effect

Inactive Publication Date: 2017-12-01
XIAN CHUANGYI ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, amorphous is a kind of unstable structural material, which can gradually transform into crystalline material through nucleation and growth under certain temperature conditions, thus losing the excellent properties of amorphous metal materials.

Method used

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  • A high thermal stability iron-based amorphous coating and its preparation method
  • A high thermal stability iron-based amorphous coating and its preparation method
  • A high thermal stability iron-based amorphous coating and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] According to the following proportions: Fe: 50.2%; Cr: 21.5%; Mo: 19.4%; B: 4.0%; C: 3.0%; Si: 1.5%; According to the filling rate of 35.6%, it is loaded into a FeCr alloy U-shaped groove with a width of 1 mm and a thickness of 0.3 mm, clad and rolled to finally form a powder core wire with a diameter of 2 mm. The cross-sectional microstructure of powder core wire is as follows: figure 1 shown. The different components in the powder core are mixed evenly and tightly combined with the skin.

[0037] Carry out sandblasting treatment on the TP91 substrate, keep the distance of sandblasting at about 300cm, and control the air pressure at about 0.5MPa. When sandblasting occurs, sparks appear and metallic luster appears, and sandblasting is completed. After sandblasting, use a wire brush to remove sand particles embedded in the surface.

[0038] Then arc spraying is used to prepare a NiAl primer layer on the sandblasted base material with commercial NiAl wire as the raw ma...

Embodiment 2

[0042] According to the following proportions: Fe: 50.2%; Cr: 22.5%; Mo: 17.2%; B: 5.0%; C: 4.0%; Si: 0.7%; According to the filling rate of 35.6%, it is loaded into a FeCr alloy U-shaped groove with a width of 1 mm and a thickness of 0.3 mm, clad and rolled to finally form a powder core wire with a diameter of 1.6 mm.

[0043] The 304 stainless steel substrate is sandblasted, the sandblasting distance is kept at about 300cm, the air pressure is controlled at about 0.5MPa, sparks appear during sandblasting and metallic luster appears, and the sandblasting is completed. After sandblasting, use a wire brush to remove sand particles embedded in the surface. Then arc spraying is used to prepare a NiAl primer layer on the sandblasted base material with commercial NiAl wire as the raw material. The coating thickness is about 100 μm. Spraying parameters: the distance between the spray gun and the substrate surface: 200mm; voltage: 30V, current : 220A, air pressure: 0.55MPa, spray gu...

Embodiment 3

[0046] According to the following proportions: Fe: 52.0%; Cr: 19.3%; Mo: 17.2%; B: 5.0%; C: 4.0%; Si: 2.0%; According to the filling rate of 35.6%, it is loaded into a FeCr alloy U-shaped groove with a width of 1 mm and a thickness of 0.3 mm, clad and rolled to finally form a powder core wire with a diameter of 2.0 mm.

[0047] For the 6063 aluminum alloy base material used in automobile engines, 24# stone sand is selected for sand blasting, the sand blasting distance is kept at about 300cm, and the air pressure is controlled at about 0.4MPa. After sandblasting, use a wire brush to remove sand particles embedded in the surface. The iron-based amorphous coating was prepared by arc spraying and the powder core wire prepared by our institute was used as raw material. Spraying parameters are as follows: distance between spray gun and substrate surface: 200mm; voltage: 30V, current: 220A, air pressure: 0.55MPa, spray gun moving speed: 600mm / s, coating thickness: 270μm.

[0048] A...

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Abstract

The invention discloses a high-thermal-stability iron-based amorphous coating and a manufacturing method thereof, and belongs to the technical field of material surface engineering. Firstly, raw material powder is obtained for manufacturing a powder core wire, wherein the raw material powder comprises, by mass, 19.3% to 22.5% of Cr, 17.2% to 20.3% of Mo, 3.1% to 5.3% of B, 3.0% to 5.2% of C and the balance Fe; secondly, a bottom coating is manufactured on a pretreated substrate material in a nickel broom-finish or Ni / Al electric arc spraying manner, and the high combination strength of the amorphous coating and the substrate material is guaranteed; and finally, the iron-based amorphous coating is deposited on the bottom coating in an electric arc spraying manner. The manufactured amorphous coating has the beneficial effects of being high in amorphous content, rigidity and thermal stability and wide in application prospect under the corrosion, abrasion and scouring resistant working conditions in the fields of chemical engineering, mining, thermal power and the like. Particularly due to the feature of the high thermal stability, the coating has the larger advantage compared with a conventional iron-based amorphous coating in the environments, like four pipes of a boiler, at certain temperatures under the corrosion, scouring and abrasion working conditions.

Description

technical field [0001] The invention belongs to the technical field of material surface engineering, and in particular relates to an iron-based amorphous coating with high thermal stability and a preparation method thereof. Background technique [0002] Unlike conventional crystalline metals, atoms in amorphous metals are arranged in a short-range order and long-range disorder arrangement. This special arrangement of atoms prevents preferential channels for corrosion and plastic deformation such as grain boundaries and dislocations in amorphous metals. Therefore, compared with crystalline metals, amorphous metals generally exhibit extremely high hardness and excellent corrosion resistance. [0003] In the traditional field of metallurgy, the acquisition of amorphous metal materials requires extremely high cooling rates to suppress the nucleation of crystal nuclei in molten liquid metal. In addition to the composition ratio of the material, the cooling rate is the most impo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C45/02C23C4/067C23C4/131
Inventor 邱质彬刘立言
Owner XIAN CHUANGYI ENERGY TECH CO LTD
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