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Nickel-base amorphous alloy powder as well as nickel-base amorphous composite coating and preparation method thereof

A technology of amorphous alloy and amorphous powder, which is applied in the field of surface coating, can solve the problems of low amorphous content of coating, reduction of amorphous content of coating, burning loss, etc., and achieve high amorphous volume content and microhardness , strong amorphous forming ability, and wide application range

Inactive Publication Date: 2013-04-24
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the use of CO 2 When the laser is prepared, because the laser heat distribution is Gaussian distribution, it will inevitably cause a large amount of melting of the base material to increase the dilution rate of the cladding layer and change its nominal composition, which will eventually lead to a low amorphous content of the coating; at the same time, due to The powder used is a mixture of simple elements, which will easily lead to the burning of easily oxidized simple elements such as Si, B and Nb during laser cladding, and will also lead to a decrease in the amorphous content of the coating.

Method used

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  • Nickel-base amorphous alloy powder as well as nickel-base amorphous composite coating and preparation method thereof
  • Nickel-base amorphous alloy powder as well as nickel-base amorphous composite coating and preparation method thereof
  • Nickel-base amorphous alloy powder as well as nickel-base amorphous composite coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1, the selected powder composition is (by weight percentage): 32.4%Fe, 4.4%B, 6.3%Si, 8.2%Nb, and the balance is Ni. The macroscopic appearance and X-ray diffraction of the powder obtained after atomization Spectrum such as figure 1 and figure 2 shown by figure 1 It can be seen that the particle size of the obtained powder is relatively uniform, and most of them are spherical, which can ensure the fluidity of the laser cladding powder feeding, and the strength of the powder is 100 mesh to 350 mesh. The XRD pattern of the powder ( figure 2 ) is mainly manifested as a diffuse scattering peak, so it is considered that the powder is mainly composed of amorphous phase, with only a small amount of crystalline phase, and the calculated amount of crystalline phase is about 5%. On the one hand, this shows that the alloy system given in this study has a high ability to form amorphous; on the other hand, it shows that the composition of the powder is very close to the...

Embodiment 2

[0034] Example 2, the selected powder components are (by weight percentage): 30.4% Fe, 3.6% B, 5.2% Si, 7% Nb, and the balance is Ni. The particle size of the obtained powder after atomization is 100~350 mesh. First, semiconductor laser cladding is used to prepare nickel-based alloy laser cladding coating on the surface of low carbon steel, and then laser rapid remelting is performed on the coating surface. Laser cladding parameters are: laser power 700W, laser scanning speed 0.36m / min, powder feeding volume 12g / min, protective gas flow 15L / min. The parameters during laser remelting are: laser power is 3500W, laser scanning speed is 8m / min during remelting, and protective gas flow rate is 15L / min.

[0035] Figure 5 This is the scanning electron micrograph of the microstructure of the obtained laser remelted layer, which shows the microscopic appearance of many white granular phases distributed on the matrix without obvious grain boundaries. The matrix is ​​a typical feature...

Embodiment 3

[0036] Example 3, the selected powder components are (by weight percentage): 32.4% Fe, 4.4% B, 6.3% Si, 8.2% Nb, and the balance is Ni. The particle size of the obtained powder after atomization is 100~350 mesh. First, semiconductor laser cladding is used to prepare nickel-based alloy laser cladding coating on the surface of low carbon steel, and then laser rapid remelting is performed on the coating surface. Laser cladding parameters are: laser power 700W, laser scanning speed 0.36m / min, powder feeding volume 12g / min, protective gas flow 15L / min. The parameters during laser remelting are: laser power is 3500W, laser scanning speed is 7m / min during remelting, and protective gas flow rate is 15L / min.

[0037] Figure 7 The scanning electron micrograph of the microstructure of the obtained laser remelting layer shows that the obtained coating is very dense and has no defects such as cracks and pores. The microstructure shows that there are many white granular phases distribut...

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Abstract

The invention discloses nickel-base amorphous alloy powder capable of obtaining an amorphous composite coating as well as a laser preparation method of the amorphous composite coating. The nickel-base amorphous alloy powder mainly consists of five elements, such as Fi, Fe, B, Si and Nb and has stronger amorphous forming ability; and meanwhile, the nickel-base amorphous alloy powder is prepared into a laser cladding coating on a low-carbon steel surface in a way of coaxially feeding powder, and then the amorphous composite coating is prepared through a high-speed laser re-melting way. The nickel-base amorphous composite coating provided by the invention is good in compactness, high in amorphous volume content and high in hardness number. The coating has good application foregrounds in the field of abrasion performance, corrosion resistance, radiation protection and the like.

Description

technical field [0001] The invention relates to a material and a method in the technical field of surface coating, in particular to a nickel-based amorphous alloy powder with strong amorphous forming ability and a laser preparation method of a nickel-based amorphous composite coating. Background technique [0002] Amorphous alloys, also known as metallic glasses, have metastable structural characteristics of long-range disorder and short-range order. Compared with traditional crystalline alloys, amorphous alloys have many excellent properties, such as high strength, high hardness, wear resistance and corrosion resistance, etc., thus arousing great interest. At present, amorphous alloy materials have not been widely used, mainly because the preparation process is difficult to control, and it is difficult to prepare bulk amorphous materials in practice, and its application is mainly limited to low-dimensional materials such as thin strips, filaments, and powders. In terms of ...

Claims

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Application Information

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IPC IPC(8): C22C45/04C23C24/10B22F1/00B22F9/08
Inventor 李瑞峰李铸国朱彦彦黄坚
Owner SHANGHAI JIAO TONG UNIV
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