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Tungsten-cobalt alloy powder and preparation method thereof

A tungsten-cobalt alloy and powder technology is applied in the field of small-sized spherical tungsten-cobalt alloy powder and its preparation, which can solve the problems of low density and bulk density, low spheroidization rate and sphericity, and high cost, and achieve uniform and small size. , high spheroidization rate, good sphericity effect

Inactive Publication Date: 2020-04-21
上大新材料(泰州)研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the metal powder prepared by water / gas atomization method and high-energy ball milling method is prone to more satellite spheres, resulting in relatively low spheroidization rate and sphericity, low apparent density and bulk density, and easy to entrain gas. Hollow sphere; powder prepared by electrolytic method presents a dendritic appearance, large internal stress exists in the powder particles, poor fluidity, and high cost; powder prepared by atomization granulation method is generally loose and porous, with low density and bulk density ; The size of the powder prepared by the rotating electrode method is generally larger than 100 μm, and the cost is high

Method used

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  • Tungsten-cobalt alloy powder and preparation method thereof
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  • Tungsten-cobalt alloy powder and preparation method thereof

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Embodiment 1

[0033] A method for manufacturing spherical tungsten-cobalt alloy powder, comprising the following steps:

[0034] 1) Cobalt tungstate (CoWO) with a mass ratio of 97% and a size of 15-25 μm 4 ) The particle size of solid particles and 2% by mass is 5-8 μmY 2 o 3 well mixed;

[0035] 2) During the above mixing process, add polyvinyl alcohol pyrrolidone (PVP, K17) with a mass ratio of 1%, then wash with water and absolute ethanol for 5 times, and fully dry at 80°C for 12 hours;

[0036] 3) Transfer the dried precursor powder into the hopper, feed the powder with argon as the carrier gas, and the intake speed is 30L / min;

[0037] 4) Adjust the hydrogen flow rate to 12L / min, raise the temperature of the plasma sintering furnace to 600°C for 5 minutes, and restore the composite powder at a heating rate of 5°C / min; then adjust the pressure of the vacuum hot press to 40MPa, and heat up to 1400°C for heat preservation 10min, the heating rate is 85℃ / min;

[0038] 5) Cool the alloy...

Embodiment 2

[0041] A method for manufacturing spherical tungsten-cobalt alloy powder, comprising the following steps:

[0042]1) Cobalt tungstate (CoWO) with a mass ratio of 97% and a particle size of 30-45 μm 4 ) particles and mass accounted for 1% particle size is 5-8μmY 2 o 3 well mixed;

[0043] 2) Add polyvinyl alcohol pyrrolidone (PVP, K17) with a mass ratio of 1% during the above mixing process, then wash with water and absolute ethanol for 5 times, and fully dry at 80°C for 12 hours;

[0044] 3) Transfer the dried precursor powder into the hopper, feed the powder with argon as the carrier gas, and the air intake speed is 35L / min;

[0045] 4) Control the hydrogen flow rate to 14L / min, raise the temperature of the plasma sintering furnace to 600°C for 8 minutes, and the heating rate is 8°C / min, increase the pressure of the vacuum hot press to 40MPa, and then raise the temperature to 1200°C for 12 minutes, and the heating rate is 90℃ / min;

[0046] 5) Cool the alloy powder to roo...

Embodiment 3

[0049] A method for manufacturing spherical tungsten-cobalt alloy powder, comprising the following steps:

[0050] 1) Cobalt tungstate (CoWO) with a mass ratio of 92% and a size of 30-45 μm 4 ) solid particles and 7% by mass of Al with a particle size of 6 μm 2 o 3 well mixed;

[0051] 2) Add polyvinyl alcohol pyrrolidone (PVP, K17) with a mass ratio of 1% during the above mixing process, then wash with water and absolute ethanol for 5 times, and fully dry at 80°C for 12 hours;

[0052] 3) Transfer the dried precursor powder into the hopper, feed the powder with argon as the carrier gas, and the air intake speed is 45L / min;

[0053] 4) Control the hydrogen flow rate to 18L / min, raise the temperature of the plasma sintering furnace to 700°C and keep it for 8 minutes, and the heating rate is 10°C / min, increase the pressure of the vacuum hot press to 50MPa, then raise the temperature to 1300°C and keep it for 12 minutes, and the heating rate is 80℃ / min;

[0054] 5) Cool the ...

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Abstract

The invention discloses a preparation method for tungsten-cobalt alloy powder. According to the preparation method, the small-size tungsten-cobalt alloy powder is prepared by adopting doping and plasma reduction methods; through doping, different elements and oxides thereof can be uniformly dispersed inside grains and at the grain boundary, so that the size of the grains is reduced, moreover, thecompactness is improved, and the hardness of a material can be enhanced; then a powder precursor is sintered through a two-step discharge plasma sintering method; and due to the fact that the plasma has the characteristics that the temperature is high, the size of a plasma torch is large, the energy density is high, the heat transfer and cooling speed is high, the powder rapidly absorbs heat and melts when passing through the plasma, then is condensed into a spherical shape under the action of surface tension, and is cooled and solidified in a quite short time to form the metal alloy powder with the high sphericity, the excellent fluidity and the high purity.

Description

technical field [0001] The invention relates to the field of powder materials, in particular to a small-sized spherical tungsten-cobalt alloy powder and a preparation method thereof. Background technique [0002] In recent years, metal 3D printing technology has gradually received widespread attention and application due to its unlimited design space, and the quality requirements for 3D printing metal powders are also getting higher and higher. Compared with other foil materials and bulk materials, small-sized metal spherical powders have the advantages of easy preparation, high material utilization rate, and wide range of categories, and are widely used in the field of metal 3D printing. [0003] Tungsten-cobalt alloy is an alloy composed of tungsten as the main body and cobalt and other elements. Tungsten is the metal with the highest melting point. It has good thermal conductivity, electrical conductivity, creep resistance, high temperature resistance, and high specifici...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/00
CPCB22F9/22B22F1/065
Inventor 李文献朱世俊张羽琦徐惠东朱明原李瑛
Owner 上大新材料(泰州)研究院有限公司