Refractory metal powder spheroidizing process

A refractory metal and process technology, applied in metal processing equipment, nanotechnology, nanotechnology for materials and surface science, etc. The effect of ensuring sphericity, ensuring dispersion and avoiding agglomeration

Active Publication Date: 2022-03-18
河北京东管业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the rapid high-temperature melting of metal powder particles, the particle size of the prepared spheroidized metal is relatively high, generally at the micron level, and it is often difficult to prepare nano-scale spheroidized metal powder using plasma technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A refractory metal powder spheroidization process, the specific steps are as follows

[0025] (1) Put vanadium pentoxide with an average particle size of 20nm in ethanol, add hydrogen peroxide accounting for 2% of the mass of vanadium pentoxide, and ethylene glycol accounting for 5% of the mass of vanadium pentoxide, mix and perform ball milling ;

[0026] (2) Filter the ball-milled slurry, spray dry it at a drying temperature of 120°C, and mechanically grind it for 100 minutes;

[0027] (3) The powder treated in step (2) is subjected to plasma spheroidization treatment to obtain a refractory metal spherical particle with an average diameter of 75nm; the flow rate of hydrogen gas during the plasma spheroidization process is 45 scfh, and the flow rate of argon gas is 5 scfh, The power is 80kw.

Embodiment 2-6

[0029] According to the method of Example 1, the vanadium pentoxide in Example 1 was replaced by niobium pentoxide, tantalum pentoxide, chromium trioxide, tungsten trioxide, and molybdenum trioxide, and the rest of the processes were unchanged. The details are shown in Table 1.

[0030] Table 1

[0031] Refractory Metal Oxide Average diameter of spherical particles of refractory metals Example 1 Vanadium pentoxide 75nm Example 2 Niobium pentoxide 70nm Example 3 Tantalum pentoxide 72nm Example 4 Chromium trioxide 63nm Example 5 Tungsten trioxide 65nm Example 6 Molybdenum trioxide 60nm

Embodiment 7-10

[0033] According to the method of Example 1, the average particle size of the vanadium pentoxide in Example 1 was adjusted to particle sizes of 10nm, 50nm, 80nm, and 100nm, and the rest of the processes were unchanged. The details are shown in Table 2.

[0034] Table 2

[0035] Average particle size of refractory metal oxides Average diameter of spherical particles of refractory metals Example 7 10nm 50nm Example 1 20nm 75nm Example 8 50nm 130nm Example 9 80nm 210nm Example 10 100nm 300nm

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Abstract

The invention discloses a spheroidizing process for refractory metal powder, and relates to the technical field of metal processing. According to the method, hydrogen peroxide and polyhydric alcohol are used for pretreating the nanoscale refractory metal oxide, and then the pretreated refractory metal oxide is subjected to reduction and spheroidizing treatment through a plasma spheroidizing device, so that the nanoscale refractory metal spherical particles are obtained. According to the treatment process, refractory metal spherical particles with the diameter of 50-350 nm can be obtained, the sphericity degree is high, and the dispersity among the particles is high.

Description

technical field [0001] The invention belongs to the technical field of metal processing, and in particular relates to a refractory metal powder spheroidization process. Background technique [0002] Refractory metals refer to titanium, zirconium, and hafnium in the IV subgroup of the periodic table, vanadium, niobium, and tantalum in the V subgroup, chromium, tungsten, and molybdenum in the VI subgroup, and rhenium in the VII subgroup. element. As a group with a melting point higher than 1650°C, refractory metals have variable valences and play an important role in the national economy with their outstanding physical, chemical, mechanical and nuclear properties, especially in cutting-edge scientific fields. important. [0003] Spherical metal powder materials have excellent physical and chemical properties, mainly in good powder fluidity, low porosity of powder particles, increased density, effective improvement in surface finish and brittleness, and thus are more and more...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22B22F1/14B22F1/054B82Y30/00B82Y40/00
CPCB22F9/22B82Y30/00B82Y40/00
Inventor 张海涛王松伟许志平庞军和蔡芝东
Owner 河北京东管业有限公司
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