Molybdenum superfine powder and preparation method thereof

A technology of ultra-fine powder and powder, which is applied in the direction of nanotechnology, nanotechnology for materials and surface science, nanotechnology, etc., can solve the limitation of industrial production of molybdenum ultrafine powder and uneven particle size distribution of powder , ultra-fine molybdenum powder equipment requirements and other issues, to achieve the effect of reducing product agglomeration, enhanced fluidity, and low equipment requirements

Inactive Publication Date: 2014-12-10
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The preparation of ultra-fine molybdenum powder by microwave plasma method and electric pulse discharge method requires high equipment, high cost and high energy consumption, and is not suitable for mass production
[0004] Therefore, the shortcomings of the current preparation technology of molybdenum ultrafine powder are: high cost, high energy consumption, complicated process, difficult to control, low output rate, low product purity, uneven particle size distribution and easy agglomeration of the powder, etc. Limits the industrial production of molybdenum ultrafine powder

Method used

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  • Molybdenum superfine powder and preparation method thereof
  • Molybdenum superfine powder and preparation method thereof
  • Molybdenum superfine powder and preparation method thereof

Examples

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Embodiment 1

[0028] A molybdenum ultrafine powder and a preparation method thereof. Mix 25.2-38.7wt% of sodium molybdate powder, 7.5-11.3wt% of metal aluminum powder and 50-67.3wt% of halide powder to prepare mixed powder; place the mixed powder Put it into a box-type electric furnace, raise the temperature to 600-700°C under the condition of argon atmosphere and a heating rate of 5-8°C / min, and keep it warm for 2-4 hours to obtain a pretreatment powder; then the pretreatment powder Put the body into a nitric acid solution with a concentration of 2-4mol / L and soak for 3-5 hours, filter to obtain the filtered mixture, wash the filtered mixture repeatedly with deionized water until the cleaning solution is neutral, and then heat it at 110°C Drying under conditions for 6 to 12 hours can obtain molybdenum superfine powder.

[0029] The halide powder described in this embodiment is a mixture of sodium chloride, potassium chloride and sodium fluoride; wherein: sodium chloride is 20 to 40 wt%, p...

Embodiment 2

[0032] A molybdenum ultrafine powder and a preparation method thereof. Mix 19.4-25.2wt% of sodium molybdate powder, 5.6-7.5wt% of metal aluminum powder and 67.3-75wt% of halide powder to prepare mixed powder; put the mixed powder into In a box-type electric furnace, the temperature is raised to 700-850°C under the condition of an argon atmosphere and a heating rate of 5-8°C / min, and the temperature is kept for 2-4 hours to obtain a pretreated powder; then the pretreated powder is Soak in a nitric acid solution with a concentration of 2-4mol / L for 3-5 hours, filter to obtain a filtered mixture, wash the filtered mixture repeatedly with deionized water until the cleaning solution is neutral, and then heat it at 110°C Drying under high temperature for 6-12 hours, the molybdenum superfine powder can be obtained.

[0033] The halide powder described in this embodiment is sodium chloride.

[0034] The XRD spectrum of a kind of molybdenum ultrafine powder prepared in the present em...

Embodiment 3

[0036] A molybdenum ultrafine powder and a preparation method thereof. Mix 25.2-39.6wt% of sodium molybdate powder, 7.5-10.4wt% of metal aluminum powder and 50-67.3wt% of halide powder to prepare mixed powder; place the mixed powder Put it into a box-type electric furnace, raise the temperature to 800-850°C in an argon atmosphere and a heating rate of 2-5°C / min, and keep it warm for 3-5 hours to obtain a pretreated powder; then the pretreated powder Put the body into a nitric acid solution with a concentration of 2-4mol / L and soak for 5-8 hours, filter to obtain the filtered mixture, wash the filtered mixture repeatedly with deionized water until the cleaning solution is neutral, and then heat it at 110°C Drying under conditions for 6 to 12 hours can obtain molybdenum superfine powder.

[0037] The halide powder described in this embodiment is sodium fluoride.

[0038] The ultrafine molybdenum powder prepared in this example has a high purity and a particle size of 0.5-0.9 μ...

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Abstract

The invention relates to a molybdenum superfine powder and a preparation method thereof. The preparation method comprises the following steps: 19.4-40wt % of a sodium molybdate powder, 5-11.3wt % of a metal aluminum powder and 50-75wt % of a halide powder are uniformly mixed; the mixture of the sodium molybdate powder, the metal aluminum powder and the halide powder is placed into a box type electric furnace; under the condition of argon gas atmosphere and the temperature increment rate of 2-8 DEG C/min, the mixture of the sodium molybdate powder, the metal aluminum powder and the halide powder is heated to 600-850 DEG C; the heat preservation is kept for 2-5 hours, so as to prepare A pretreatment powder; the pretreatment powder is placed into a nitric acid solution with the concentration of 2-4 mol/L for 3-8 hours of soaking; after filtration, a filtered compound is prepared; deionized water is adopted to repeatedly clean and filter the filtered compound until a cleaning solution becomes neutral; then, drying is conducted for 6-12 hours at 110 DEG C; the molybdenum superfine powder is obtained. The preparation method of the molybdenum superfine powder has the characteristics of simple and easily controlled synthesis process, low reaction temperature, high productivity, low cost, broad industrialization prospect and small environmental pollution. The molybdenum superfine powder prepared by the method has high activity, small particle aggregation and high purity.

Description

technical field [0001] The invention belongs to the technical field of heavy metal ultrafine powder. Specifically relates to a molybdenum ultrafine powder and a preparation method thereof. Background technique [0002] Metal molybdenum and its alloys have excellent characteristics such as high melting and boiling point, small thermal expansion coefficient, good thermal and electrical conductivity, high strength, high hardness and good corrosion resistance, so they are widely used in thermal engineering, metallurgy, chemical industry, aerospace and other fields. [0003] At present, the preparation methods of molybdenum ultrafine powder mainly include: mechanical ball milling method, reduction method, hydroxyl thermal decomposition method, molybdenum chloride steam method, molybdenum chloride decomposition method, microwave plasma method and electric pulse discharge method, etc. Although these methods have their own advantages, there are some shortcomings. The mechanical ba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F1/00B82Y30/00B82Y40/00
Inventor 张海军邓先功张少伟李发亮鲁礼林
Owner WUHAN UNIV OF SCI & TECH
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