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A kind of plasma preparation method of nickel-based alloy spherical powder

A nickel-based alloy and spherical powder technology, which is applied in the field of plasma preparation, can solve problems such as not being able to meet the requirements of high-end customers, and achieve the effects of fine grain size, shortened process flow, and high hardness

Inactive Publication Date: 2017-12-29
LONGYAN ZIJIN INNOVATION RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the limitation of technical conditions, there are few domestic companies that produce spherical nickel-based alloy powder, and most of them are low-end products, which cannot meet the requirements of high-end customers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] This embodiment provides a plasma preparation method of nickel-based alloy spherical powder, comprising the following steps:

[0023] In the first step, the nickel-based superalloy Inconel718 is selected as the raw material;

[0024] The second step is to use the vacuum induction melting method to put the mixed alloy into the quartz tube, heat it through the induction coil and introduce electromagnetic vibration to melt the alloy completely and evenly, and the added current is 15A;

[0025] In the third step, argon gas is introduced to generate air pressure, and the molten alloy is sprayed onto the high-speed rotating copper roller through the nozzle of the quartz tube at a speed of 1000r / min. Under the condition of rapid cooling, the cooling rate is 10 4 K / s, forming strips containing amorphous, the vacuum degree of the alloy in the melting environment is 1.0×10 -2 , add argon to -0.3MPa;

[0026] In the fourth step, the strip containing the amorphous existence enter...

Embodiment 2

[0032] This embodiment provides a plasma preparation method of nickel-based alloy spherical powder, comprising the following steps:

[0033] In the first step, Ni, Cr, Mo, Nb, Fe, Ti, Mn, Si, C, Cu, P and S are selected and configured in proportion, wherein Cr is 20-20.5, Mo is 8-10, and Nb is 3.15-4.15 , Fe≤5, Ti≤0.4, Mn≤0.5, Si≤0.5, C≤0.1, Cu≤0.5, P≤0.015, S≤0.015;

[0034] The second step is to use the vacuum induction melting method to put the mixed alloy into the quartz tube, heat it through the induction coil and introduce electromagnetic vibration to melt the alloy completely and uniformly, and the added current is 20A;

[0035] The third step is to introduce argon gas to generate air pressure, and spray the molten alloy through the nozzle of the quartz tube onto the high-speed rotating copper roller at a speed of 1200r / min. Under the condition of rapid cooling, strips containing amorphous are formed. Cooldown rate is 10 4 K / s, the vacuum degree of the alloy in the me...

Embodiment 3

[0042] This embodiment provides a plasma preparation method of nickel-based alloy spherical powder, comprising the following steps:

[0043] In the first step, the nickel-based alloy Inconel718 is selected as the basic material;

[0044] The second step is to use the vacuum induction melting method to put the mixed alloy into the quartz tube, heat it through the induction coil and introduce electromagnetic vibration to melt the alloy completely and evenly, and the added current is 25A;

[0045] In the third step, argon gas is introduced to generate air pressure, and the molten alloy is sprayed onto the high-speed rotating copper roller through the nozzle of the quartz tube at a speed of 1400r / min. Under the condition of rapid cooling, the cooling rate is 10 5 K / s, forming strips containing amorphous, the vacuum degree of the alloy in the melting environment is 1.0×10 -3 , add argon to -0.6MPa;

[0046] In the fourth step, the strip containing the amorphous existence enters a v...

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Abstract

The invention discloses a plasma preparation method for nickel-based alloy spherical powder. The plasma preparation method comprises the following steps: selecting a nickel-based alloy or preparing an alloy; adopting a vacuum induction melting method to melt the alloy; introducing argon gas for spraying a molten alloy liquid through a nozzle of a quartz tube, and quickly cooling the molten alloy liquid to form an amorphous stripe; introducing the stripe into a vacuum thermal treatment environment, and converting an amorphous phase into a crystalline phase; crushing the stripe into nickel-based alloy powder with an irregular shape; establishing a plasma torch with high energy density and great heating strength; taking the argon gas as a carrier gas, feeding raw materials into a core high-temperature zone of the plasma torch by a powder feeding probe for melting; and introducing the molten raw materials into a powder nodulizing chamber, cooling and curing the molten raw materials under extremely high temperature gradient, thereby forming spherical nickel-based alloy powder particles and collecting the spherical nickel-based alloy powder particles. According to the plasma preparation method, the raw material range is expanded, the transformation of crystals is effectively controlled, mechanical performances such as plasticity, strength and the like of the alloy are improved; and the prepared product is high in degree of sphericity, is good in mobility, is uniform in grain size distribution and is uniform in structure, and can be used for thermal spraying, the 3D printing technology and the like.

Description

technical field [0001] The invention relates to a plasma preparation method of nickel-based alloy spherical powder, belonging to the technical field of metal powder preparation. Background technique [0002] At present, the nickel-based alloys that can be applied to 3D printing are: Inconel 738, which has good high-temperature creep rupture strength, and its thermal corrosion resistance is a superalloy with a low chromium content. Hastelloy X has high strength and oxidation resistance at high temperatures, and also has good ductility in environments up to 1200 ° C. At present, it is mainly used in aerospace technology, such as gas turbine components and combustion zone components such as transition tubes, Burner pots, spray booms, exhaust pipes, afterburners, etc.; and because of its resistance to stress corrosion cracking, it is used in industrial furnaces, petrochemical and chemical process industries. Inconel 625 still has good load performance at a high temperature of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/02B22F9/06B22F9/04B22F9/10
CPCB22F9/02B22F9/04B22F9/06B22F9/10
Inventor 陈海霞刘志光刘少存吴鹏
Owner LONGYAN ZIJIN INNOVATION RES INST
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