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Method for preparing spherical molybdenum-based powder

A spherical, molybdenum-based technology, applied in the field of preparation of ultra-fine spherical molybdenum-based powder, can solve the problems of irregularly shaped powder, etc., and achieve the effects of small particle size, simple process and high sphericity

Active Publication Date: 2019-07-16
UNIV OF SCI & TECH BEIJING +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the current methods for preparing oxide dispersion strengthened molybdenum-based powders are irregular powders

Method used

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  • Method for preparing spherical molybdenum-based powder
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  • Method for preparing spherical molybdenum-based powder

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[0025] Such as figure 1 Shown, a kind of preparation method of ultrafine spherical molybdenum base powder of the present invention, described method comprises the following steps,

[0026] Configuration of S1 precursor solution: the metal molybdenum source is ammonium paramolybdate, mixed with nano oxides, dissolved in the solvent, and after continuous stirring, a transparent precursor solution is obtained;

[0027] Preparation of S2 ultra-fine spherical molybdenum-based powder: The transparent precursor solution obtained in S1 is prepared by radio frequency plasma spheroidization technology to obtain ultra-fine spherical molybdenum-based powder, and the average particle size of the oxide dispersed phase in the ultra-fine spherical molybdenum-based powder is Diameter ≤ 15nm.

[0028] According to an embodiment of the present disclosure, the solvent in S1 is deionized water.

[0029] According to an embodiment of the present disclosure, the nano-oxide in S1 is Al(NO 3 ) 3 9...

Embodiment 1

[0035]Embodiment 1: Mo-1wt%Al 2 o 3 Preparation of Ultrafine Spherical Molybdenum-Based Powder

[0036] Ammonium paramolybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O) and aluminum nitrate (Al(NO 3 ) 3 9H 2 O) Dissolve in deionized water at a molar ratio of 7.514:1, and stir evenly in a container to obtain a precursor mixed solution. During the radio frequency plasma spheroidization process, the negative pressure is 6500Pa; the middle gas is argon, and the flow rate of the middle gas is 30L / min; the shell gas is argon, and the flow rate of the shell gas is 70L / min; the hydrogen gas with a flow rate of 8L / min is used as the carrier gas The precursor solution is fed at a rate of 0.4L / min through the feeding system and the feeding gun, and sprayed into the plasma arc through the atomizing nozzle. The mixed solution absorbs heat and decomposes, reduces, melts and then spheroidizes in the plasma arc instantly. Finally, it enters the cooling room and condenses rapidly. Obtain Mo-1wt....

Embodiment 2

[0037] Embodiment 2: Mo-2wt%Al 2 o 3 Preparation of Ultrafine Spherical Molybdenum-Based Powder

[0038] Ammonium paramolybdate ((NH 4 ) 6 Mo 7 o 24 4H 2 O) and aluminum nitrate (Al(NO 3 ) 3 9H 2 O) Dissolve in deionized water at a molar ratio of 3.719:1, and stir evenly in a container to obtain a precursor mixed solution. During the radio frequency plasma spheroidization process, the negative pressure is 7200Pa; the middle gas is argon, and the flow rate of the middle gas is 33L / min; the shell gas is argon, and the flow rate of the shell gas is 75L / min; the hydrogen gas with a flow rate of 12L / min is used as the carrier gas The precursor solution is fed at a rate of 0.3L / min through the feeding system and the feeding gun, and sprayed into the plasma arc through the atomizing nozzle. The mixed solution absorbs heat and decomposes, reduces, melts and then spheroidizes in the plasma arc instantly. Finally, it enters the cooling room and condenses rapidly. Obtain W-2wt...

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Abstract

The invention belongs to the field of preparation and research for a spherical metal-based powder, and provides a method for preparing a superfine spherical molybdenum-based powder. The method comprises the following steps: S1, preparation for a precursor solution: a metal molybdenum source and a nanometer oxide in raw materials are dissolved in an appropriate amount of solvent and then stirred toobtain the transparent precursor solution; and S2, preparation for a superfine spherical powder product: radiofrequency plasma spheroidization is carried out on the obtained precursor solution, the precursor solution is conveyed to an atomizing nozzle by carrier gas and atomized, and then arrives at a high-temperature area for radiofrequency plasma heating, a solute in the precursor solution is decomposed to obtain the nano-composite powder of WO3 and the corresponding oxide, then the nano-composite powder reacts with H2 to obtain oxide-dispersion-strengthened molybdenum powder, then the composite powder is melted and becomes spherical under the effect of surface tension, and is cooled to obtain the product. The method provides a new thought for preparing the superfine spherical oxide-dispersion-strengthened molybdenum powder, and has the advantages of being short in production period, low in cost, convenient to operate, and the like.

Description

technical field [0001] The invention belongs to the research field of preparation of spherical metal-based powders, and in particular provides a preparation method of ultrafine spherical molybdenum-based powders. Background technique [0002] Molybdenum is a metal material with a wide application background. It has the advantages of high melting point, good electrical and thermal conductivity, small thermal expansion coefficient, and strong thermal shock resistance, especially at higher operating temperatures. It also has higher strength, hardness and creep resistance. Compared with tungsten and rhenium, which are also refractory metals, the density of molybdenum is 10.2g / cm 3 , only tungsten (19.3 g / cm 3 ), rhenium (21.0 g / cm 3 ), which makes it popular as a very important high-temperature structural material in cutting-edge fields such as aerospace, national defense and military industry, and nuclear industry. [0003] The development of today's science and technology ...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00B22F3/22B33Y70/00C22C32/00C22C27/04
CPCB22F9/22B22F3/225B33Y70/00C22C32/0031C22C27/04B22F2999/00B22F1/065B22F2202/13
Inventor 曲选辉章林陈晓玮刘烨陈旭秦明礼
Owner UNIV OF SCI & TECH BEIJING
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