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Preparation method of nanometer molybdenum powder containing homodisperse carbon nano tubes

A carbon nanotube and nanomolybdenum powder technology, which is applied in the field of nanocomposite powder preparation, can solve the problem of less research

Active Publication Date: 2013-08-21
XIAMEN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] There are few studies on the preparation of the composite powder of the second phase dopant and nano molybdenum powder

Method used

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  • Preparation method of nanometer molybdenum powder containing homodisperse carbon nano tubes
  • Preparation method of nanometer molybdenum powder containing homodisperse carbon nano tubes

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Embodiment 1

[0028] like figure 1 Shown, the preparation technological process of the preparation method of a kind of nano-molybdenum powder containing uniformly dispersed carbon nanotubes of the present invention is:

[0029] (1) Modification of carbon nanotubes: place carbon nanotubes in concentrated nitric acid (the content of carbon nanotubes relative to concentrated nitric acid is 5-15g / 100ml), ultrasonically disperse at a temperature of 60-80°C for 20-30min, and then in Reflux treatment at 70-90°C for 1-5h, after cooling to room temperature, dilute with deionized water and suction filter until neutral, then place the powder in a vacuum drying oven at 60-90°C for 2-5h to obtain modified carbon nanotubes. Through this step, the generation of agglomeration of carbon nanotubes can be reduced, and their dispersion and adsorption characteristics for nanometer molybdenum powder can be improved.

[0030](2) Preparation of sol: weigh a certain amount of carbon nanotubes and mix them with am...

Embodiment 2

[0036] A preparation process of nano-molybdenum powder containing uniformly dispersed carbon nanotubes is:

[0037] (1) Modification of carbon nanotubes: place carbon nanotubes in concentrated nitric acid (the content of carbon nanotubes relative to concentrated nitric acid is 5-15g / 100ml), ultrasonically disperse at a temperature of 60-80°C for 20-30min, and then in Reflux treatment at 70-90°C for 1-5h, after cooling to room temperature, dilute with deionized water and suction filter until neutral, then place the powder in a vacuum drying oven at 60-90°C for 2-5h to obtain modified carbon nanotubes.

[0038] (2) Preparation of sol: Weigh carbon nanotubes with a volume content of 12% (relative to the total content of carbon nanotubes plus ammonium paramolybdate solution) and mix them with ammonium paramolybdate solution, add citric acid monohydrate and polyethylene glycol reagent (The amount of both additions is 0.5-1.5% of the volume of the mixed solution). After fully stirr...

Embodiment 3

[0044] A preparation process of nano-molybdenum powder containing uniformly dispersed carbon nanotubes is:

[0045] (1) Modification of carbon nanotubes: place carbon nanotubes in concentrated nitric acid (the content of carbon nanotubes relative to concentrated nitric acid is 5-15g / 100ml), ultrasonically disperse at a temperature of 60-80°C for 20-30min, and then in Reflux treatment at 70-90°C for 1-5h, after cooling to room temperature, dilute with deionized water and suction filter until neutral, then place the powder in a vacuum drying oven at 60-90°C for 2-5h to obtain modified carbon nanotubes.

[0046] (2) Preparation of sol: Weigh carbon nanotubes with a volume content of 23% (relative to the total content of carbon nanotubes plus ammonium paramolybdate solution) and mix them with ammonium paramolybdate solution, add citric acid monohydrate and polyethylene glycol dropwise Reagents (the amount of both additions is 0.5-1.5% of the volume of the mixed solution). After f...

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Abstract

The invention discloses a preparation method of nanometer molybdenum powder containing homodisperse carbon nano tubes. The carbon nano tubes and ammonium paramolybdate are selected as raw materials, hydrogen is used as reduction carrier gas, adsorption characteristics of the carbon nano tubes on nanometer molybdenum particles are utilized, and then carbon nano tube / nanometer molybdenum powder composite powder is prepared by utilizing the adsorption characteristics of the carbon nano tubes on the nanometer molybdenum particles. The preparation technology process is modification of the carbon nano tubes-gel dissolving-gel coagulation-grinding-hydrogen gas reduction-carbon nano tube / nanometer molybdenum powder composite powder. According to the preparation method, the carbon nano tube / nanometer molybdenum powder composite powder is prepared by utilizing the adsorption characteristics of the carbon nano tubes on the nanometer molybdenum particles, through modification on the carbon nano tubes and mixing the carbon nano tubes and ammonium paramolybdate solution, and by adopting gel dissolving and gel coagulation and reduction process. The average grain diameter of the prepared molybdenum powder is 20-80nm, the carbon nano tubes can be dispersed evenly in the nanometer molybdenum powder, and industrial mass production can be achieved easily.

Description

technical field [0001] The invention relates to a preparation technology of nanocomposite powder, in particular to a preparation method of nanomolybdenum powder containing uniformly dispersed carbon nanotubes. Background technique [0002] Metal molybdenum is widely used in iron and steel industry, chemical industry, metallurgy and aerospace and other fields. Molybdenum powder is the main raw material for preparing molybdenum and molybdenum alloy products by powder metallurgy technology. The particle size of molybdenum powder has an important influence on the sintering performance of the product. The finer the molybdenum powder, the greater the sintering activity, the lower the sintering temperature, and the higher the density. Nanoscale molybdenum powder can significantly improve the sintering activity of molybdenum and its alloys, reduce the sintering temperature, and refine the structure, thereby improving the mechanical properties of molybdenum and molybdenum alloys. N...

Claims

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Application Information

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IPC IPC(8): B22F9/26
Inventor 张厚安古思勇吴和尖李荣文
Owner XIAMEN UNIV OF TECH
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