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Nickel based alloy powder for laser sintering formation, and its prepn. method

A nickel-based alloy and laser sintering technology, which is applied in the field of nickel-based alloys, can solve problems such as difficult sintering of metal parts, spheroidizing sintering shrinkage, and affecting the performance of parts, etc., to achieve small component segregation, small pollution, and expand types and components. range effect

Inactive Publication Date: 2006-04-12
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the current commercially available nickel powder or nickel alloy powder has serious spheroidization and sintering shrinkage during laser rapid prototyping sintering, and the resulting thermal stress causes the parts to warp and affects the final performance of the part.
In addition, most alloy powders are processed by mechanical powder mixing. Due to the influence of powder density, shape and melting point differences, problems such as alloy composition segregation and uneven structure are prone to occur during laser sintering, and it is difficult to sinter into dense metal parts

Method used

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  • Nickel based alloy powder for laser sintering formation, and its prepn. method
  • Nickel based alloy powder for laser sintering formation, and its prepn. method
  • Nickel based alloy powder for laser sintering formation, and its prepn. method

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Experimental program
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Effect test

Embodiment 1

[0019] Put the commercially available 75-150 micron pure nickel powder, pure copper powder and pure tin powder into the intermediate frequency induction furnace according to the weight percentage of 84:14.4:1.6, and heat it to 1500 degrees Celsius under an argon atmosphere to completely melt and mix the powder uniform. The molten metal flow is injected into the leaky crucible of the water atomization equipment, and a water atomization nozzle is placed under the leaky crucible. When the molten metal flow passes through the nozzle and flows through the nozzle, the high-speed water flow ejected by the nozzle Break into small droplets, and then the alloy droplets fall into the water and solidify into powder. figure 2 It is the energy spectrum analysis result of the Ni-Cu-Sn powder. It can be seen from the figure that the content of Ni is the highest, which is 85.17% by weight, followed by Cu, which is 13.58% by weight, and Sn is 1.25% by weight. close to the theoretical value. ...

Embodiment 2

[0024] Put the commercially available 75-150 micron pure nickel powder, pure copper powder and pure tin powder into the medium frequency induction furnace according to the weight percentage of 90:9:1, and heat to 1550 degrees Celsius under an argon atmosphere to completely melt and mix the powders uniform. The molten metal flow is injected into the leaky crucible of the water atomization equipment, and the water atomization nozzle is placed at the lower part of the crucible. The high-speed water flow from the nozzle breaks the molten metal flow into small droplets, and then makes the alloy droplets It solidifies into powder when dropped in water. After the above treatment alloy powder, the degree of spheroidization is good, and the particle size of the powder is finer. After sieving, select 100-150 micron powder for sintering, such as Figure 5 shown. The powder has a good degree of spheroidization and uniform particle size distribution. Insulate in a hydrogenation furnace...

Embodiment 3

[0026] Put the commercially available 75-150 micron pure nickel powder, pure copper powder and pure tin powder into the medium frequency induction furnace according to the weight percentage of 80:18:2, and heat it to 1450 degrees Celsius under an argon atmosphere to completely melt and mix the powder uniform. The molten metal flow is injected into the leaky crucible, and the high-speed water flow from the nozzle breaks the molten metal flow into small droplets, and then the alloy droplets fall into the water and solidify into powder. After sieving, select 100-150 micron powder for sintering, such as Figure 5 shown. The powder particles are basically spherical, with uniform particle size distribution, and are suitable for laser rapid prototyping. Insulate in a hydrogenation furnace at 550 degrees Celsius for 2 hours to deoxidize. After testing, the oxygen content of the 100-150 micron powder after hydrogenation is reduced from 0.77% by weight before hydrogenation to 0.42% b...

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Abstract

A Ni-based alloy powder able to be quickly shaped by laser sintering is prepared from Ni (80-90 Wt%), Cu (10-18) and Sn (1-2) through proportional mixing, loading in MF induction furnace, heating to 1450-1550 deg.C in Ar atmosphere for smelting, pouring the molten metal in a leaking crucible with a water atomizing nozzle under it, and making the molten metal to flow from said crucible via the nozzle into water while being broken into small drips by the high-speed water stream sprayed from said nozzle, so obtaining the fine particles.

Description

technical field [0001] The invention belongs to the technical field of nickel-based alloys, in particular to a nickel-based alloy powder for laser sintering rapid prototyping and a preparation method thereof. The nickel-based alloy powder is suitable for laser sintering. Background technique [0002] In the field of aerospace, nickel and nickel-based alloys are playing an increasingly important role. Nickel-based alloys generally have high strength, high plasticity and high corrosion resistance, and are mainly used to process parts and equipment with high temperature load and corrosion resistance, and are currently receiving more and more attention. Laser rapid prototyping technology is a high-tech in the manufacturing industry, which provides a shortcut to realize the short cycle, multiple varieties and low cost of parts manufacturing. The idea of ​​this technology originates from the inverse process in which a three-dimensional entity is cut into a series of tiny units. B...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F1/00
Inventor 曹文斌赵靖谭永生张雁费群星段爱琴葛昌纯
Owner UNIV OF SCI & TECH BEIJING