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Preparation method of low-oxygen-content molybdenum powder

A low oxygen content, molybdenum powder technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of limiting the performance of molybdenum alloy products, achieve large-scale production and environmental protection, obvious oxygen content, and unlimited production capacity Effect

Active Publication Date: 2019-12-17
FUJIAN ACETRON NEW MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Molybdenum powder with small particle size, especially molybdenum powder with an average particle size below 10-20 microns, can easily absorb oxygen in the air environment, causing the oxygen content of molybdenum powder to easily reach more than 500ppm, which seriously limits its application and molybdenum alloy products. performance

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preparation example Construction

[0031] A method for preparing molybdenum powder with low oxygen content, comprising the following steps: using 2-10 micron molybdenum powder as a raw material, forming it through a cold isostatic press at 150-300 MPa, and then crushing it to 100-200 mesh with a disc grinder and passing through 100 mesh Sieve, hydrogenate the powder at 1000-1500°C, keep it warm for 1-5h, cool the powder to room temperature, crush it in a nitrogen atmosphere, and pass through a 100-mesh sieve to obtain molybdenum powder with an average particle size of 100 mesh and an oxygen content of 50-150ppm. Such as figure 1 shown.

[0032] The molybdenum powder used in the present invention is molybdenum oxide, ammonium molybdate and other molybdenum powder obtained after hydrogen reduction at a high temperature of 500-1200 ° C. The raw material of this molybdenum powder generally has a particle size of 2-10 microns. The use of products is also because the preparation process determines that the particle ...

Embodiment 1

[0037] The molybdenum powder raw material is selected as molybdenum powder with D50=4.5 microns, and the oxygen content is 680ppm.

[0038] Weigh 15kg of molybdenum powder into the rubber sheath, and vibrate it with a vibration platform. After sealing, mold it in a cold isostatic press at 285MPa, and the pressure holding time is 2 minutes. After the pressing is completed, the density of the molybdenum block is tested as 67%.

[0039] Continue to put the molybdenum block into the rubber sheath and hit it with a hammer to break the molybdenum block into small pieces, then transfer the molybdenum block to a zirconia grinding machine for further crushing, and the crushed particles pass through a 100-mesh sieve network.

[0040] Place the crushed and sieved molybdenum powder on a molybdenum boat tray with a size of 300*500mm to prevent uniformity, and then calcinate and keep it warm for 3 hours in a hydrogen environment at 1350°C.

[0041] After the calcination is completed, lowe...

Embodiment 2

[0044] The molybdenum powder raw material is selected as molybdenum powder with D50=4.5 microns, and the oxygen content is 680ppm.

[0045] 1. Weigh 15kg of molybdenum powder into the rubber sheath, and vibrate it with a vibration platform. After sealing, mold it in a cold isostatic press at 150MPa. The holding time is 2 minutes. After pressing, test the molybdenum block. The density is 53%.

[0046] 2. Continue to put the molybdenum block into the rubber sheath, hit it with a hammer to break the molybdenum block into small pieces, and then transfer the molybdenum block to a zirconia grinding machine for further crushing. The crushed particles are over 100 mesh screen.

[0047] 3. Place the crushed and sieved molybdenum powder on a molybdenum boat tray with a size of 300*500mm to prevent uniformity, and then calcinate and keep it warm for 2 hours in a hydrogen environment at 1150°C.

[0048] 4. After the calcination is completed, lower it to room temperature, crush the bonde...

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Abstract

The invention relates to a preparation method of low-oxygen-content molybdenum powder. The method comprises the following steps that 2-10-micrometer molybdenum powder is adopted as a raw material andmolded by a cold isostatic press under the pressure of 150-300 MPa, then, a millstone machine is adopted for breaking the powder into 100-200 meshes, the powder is screened through a 100-mesh screen,the powder is subjected to hydrogenation treatment under the temperature of 1,000-1,500 DEG C, heat preservation is performed for 1-5 h, the powder is cooled to the room temperature and smashed through nitrogen atmosphere airflow and screened by a 100-mesh screen, and the molybdenum powder with the uniform granularity being 100 meshes and the oxygen content being 50-150 ppm is obtained. The technology is simple, the technology is extended directly on the traditional preparation technology, only a small amount of investment is needed, and the capacity is not limited; more importantly, the oxygen content is quite low, and the oxygen content of the molybdenum powder which is ordinarily 500-700 ppm is lowered to 50-150 ppm. The preparation method has the beneficial effect that the remarkable competitive advantages and profit space are shown in the aspects of the manufacturing cost, the product performance, large-scale production, environmental friendliness and the like.

Description

technical field [0001] The invention relates to the technical field of preparation of functional inorganic materials, in particular to a method for preparing molybdenum powder with low oxygen content. Background technique [0002] In the powder metallurgy preparation process of molybdenum products, the raw material performance of molybdenum powder greatly affects the quality of subsequent processed products. In the production process from raw material ammonium molybdate to molybdenum deep-processed products, the preparation of molybdenum powder is relatively important link. [0003] According to the use of molybdenum powder, the main preparation methods of molybdenum powder are divided into three categories: molybdenum powder for pressing, spherical molybdenum powder for thermal spraying and ultra-fine molybdenum powder for special conditions. In order to meet the needs of different types of molybdenum powders, it is necessary to study the process of preparing various molyb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/04B22F9/04B22F1/00
CPCB22F3/04B22F9/04B22F2009/045B22F2009/044B22F2998/10B22F2999/00B22F1/145B22F2201/013
Inventor 侯庆龙陈钦忠张科吴荣祯蔡小勇张梦兰
Owner FUJIAN ACETRON NEW MATERIALS CO LTD
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