Preparation method of spherical tungsten-molybdenum alloy powder for 3D printing

A tungsten-molybdenum alloy, 3D printing technology, applied in metal processing equipment, transportation and packaging, additive processing, etc., can solve the problem that the performance cannot meet the performance requirements of 3D printing powder and formed products, and achieves lower production costs, The effect of uniform distribution of ingredients and improved overall performance

Inactive Publication Date: 2019-04-30
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the domestic existing technology generally prepares tungsten, molybdenum and its alloy powder by chemical method or ball milling mixing method, and its performance is far from meeting the performance requirements of 3D printing powder and formed products.

Method used

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  • Preparation method of spherical tungsten-molybdenum alloy powder for 3D printing
  • Preparation method of spherical tungsten-molybdenum alloy powder for 3D printing
  • Preparation method of spherical tungsten-molybdenum alloy powder for 3D printing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 1) Select tungsten and molybdenum primary powders with a particle size range of 0.5-10um, and the proportion of tungsten powder in the tungsten-molybdenum mixed powder is 65.19wt.%;

[0024] 2) Add binder and deionized water to the mixed powder first, the total solid content of tungsten and molybdenum is 70wt.%, of which the binder content is 1wt.%, and the mass added to the mixed powder is 10wt. % of the abrasive material, then ball milling is carried out at 230rpm at a rotating speed, and the ball milling time is 0.5h;

[0025] 3) Add a dispersant to the mixed powder after ball milling, the content of which is 0.5wt.%, and then put it into a ball mill for ball milling at 230rpm, and the ball milling time is 0.5h;

[0026] 4) Spray-dry the mixed powder with an air-flow spray granulator, wherein the feeding rate is 15mL / min, the spray pressure is 0.1MPa, and the drying temperature is 190°C to prepare the precursor powder;

[0027] 5) Use a sintering furnace to sinter t...

Embodiment 2

[0031] 1) Select tungsten and molybdenum primary powders with a particle size range of 0.5-10um, and the proportion of tungsten powder in the tungsten-molybdenum mixed powder is 65.19wt.%;

[0032] 2) Add binder and deionized water to the mixed powder first, the total solid content of tungsten and molybdenum is 80wt.%, of which the binder content is 1wt.%, and the mass added to the mixed powder is 20wt. % of the abrasive material, then ball milling is carried out at 250rpm at a rotating speed, and the ball milling time is 1h;

[0033] 3) Add a dispersant to the mixed powder after ball milling, the content of which is 1wt.%, and then put it into a ball mill for ball milling at 250rpm, and the ball milling time is 1h;

[0034] 4) Spray-dry the mixed powder with an air-flow spray granulator, wherein the feeding rate is 4mL / min, the spray pressure is 0.1MPa, and the drying temperature is 190°C to prepare the precursor powder;

[0035] 5) Use a sintering furnace to sinter the prec...

Embodiment 3

[0039] 1) Select tungsten and molybdenum primary powders with a particle size range of 0.5-10um, and the proportion of tungsten powder in the tungsten-molybdenum mixed powder is 65.19wt.%;

[0040] 2) Add binder and deionized water to the mixed powder first, the total solid content of tungsten and molybdenum is 80wt.%, of which the binder content is 1wt.%, and the mass added to the mixed powder is 10wt. % of the abrasive material, then ball milling is carried out at 230rpm at a rotating speed, and the ball milling time is 1h;

[0041] 3) Add a dispersant to the mixed powder after ball milling, the content of which is 1wt.%, and then put it into a ball mill for ball milling at 230rpm, and the ball milling time is 1h;

[0042] 4) Spray-dry the mixed powder with an air-flow spray granulator, wherein the feeding rate is 15mL / min, the spray pressure is 0.2MPa, and the drying temperature is 190°C to prepare the precursor powder;

[0043] 5) Use a sintering furnace to sinter the pre...

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Abstract

The invention provides a preparation method of spherical tungsten-molybdenum alloy powder for 3D printing and belongs to the field of refractory metal 3D printing. The preparation method comprises thefollowing steps of (1) mechanically mixign tungsten powder and molybdenum powder in proportion; (2) preparing the mechanically mixed powder into spherical precursor powder through the spray granulation technology; (3) conducting sintering on the precursor powder; and (4) conducting spheroidizing treatment on the sintered powder through the plasma spheroidization technology. The spherical tungsten-molybdenum alloy powder prepared through the method is excellent in sphericity degree and fluidity and narrow in particle size distribution and has excellent formability through 3D printing verification.

Description

technical field [0001] The invention belongs to the field of 3D printing of refractory metals, in particular to a method for preparing spherical tungsten-molybdenum alloy powder for 3D printing. Background technique [0002] Tungsten-molybdenum alloy not only has the high-strength properties of metal tungsten, excellent high-temperature resistance, but also inherits the super-strong corrosion resistance and ablation resistance of metal molybdenum, and has a low thermal expansion coefficient. It is widely used in aerospace, high-temperature nuclear reactors, etc. field. Due to the high melting point and high temperature strength of tungsten and molybdenum, smelting and processing are difficult, and the powder metallurgy forming technology usually adopted requires expensive tooling molds, and the process is complicated and it is difficult to form parts with complex three-dimensional structures, which limits its application range. expand. However, the forming of 3D printing t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/08B22F9/04B22F1/00C22C27/04B33Y70/00
CPCC22C27/04B22F9/04B22F9/082B33Y70/00B22F2009/043B22F1/065B22F1/14
Inventor 贺定勇周振鲁谈震吴旭周正郭星晔王国红王曾吉
Owner BEIJING UNIV OF TECH
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