Preparation method of molybdenum powder

A molybdenum powder and preparation process technology, applied in the field of molybdenum powder preparation, can solve the problems of uneven size, agglomeration, and poor dispersion of molybdenum powder, and achieve the effect of uniform size, simple operation, and good dispersion

Active Publication Date: 2010-02-10
JINDUICHENG MOLYBDENUM CO LTD
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a molybdenum powder preparation with uniform particle size, good dispersibility and no agglomeration for the existing molybdenum powder production process and the problems of uneven size, poor dispersion, agglomeration and sintered state of molybdenum powder. method

Method used

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  • Preparation method of molybdenum powder
  • Preparation method of molybdenum powder
  • Preparation method of molybdenum powder

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preparation example Construction

[0018] A method for preparing molybdenum powder, which uses ammonium molybdate or molybdenum dioxide obtained by one-stage reduction of high-purity molybdenum trioxide as a raw material, and the Fischer particle size of the molybdenum dioxide is required to be 2.5-4.0 μm. The above-mentioned molybdenum dioxide is screened through 100-mesh and 160-mesh screens to obtain molybdenum dioxide with three mesh grades of +100 mesh, -100 mesh to +160 mesh and -160 mesh.

[0019] Molybdenum powder is obtained by reducing the molybdenum dioxide of the above three mesh levels in a single-tube or multi-tube hydrogen reduction furnace. During the reduction process, two temperature zones are used. The trend of reduction temperature is high temperature first and then low temperature. The high temperature ranges from 930°C to 1000°C, and the holding time is 2 to 4 hours; the low temperature ranges from 800°C to 850°C, and the holding time is 2 to 4 hours. 4 hours. Material layer thickness is ...

Embodiment 1

[0022] Using molybdenum dioxide with a Fibonacci particle size of 2.5 μm as the raw material, it is screened successively through 100 mesh and 160 mesh screens, and the -160 mesh molybdenum dioxide is taken in a single-tube reduction furnace using a method of high temperature first and then low temperature Carry out hydrogen reduction, the thickness of the material layer is 2cm, the high temperature is 930°C, and the holding time is 2 hours; The performance index meets the requirements of Q / JDC013-2002 enterprise standard. figure 1 It is the photo of conventional molybdenum powder morphology, figure 2 It is the SEM photo of the molybdenum powder of this embodiment.

Embodiment 2

[0024] Using molybdenum dioxide with a Fibonacci particle size of 3.5 μm as the raw material, after sieving through 100 mesh and 160 mesh screens, take -100 ~ +160 mesh molybdenum dioxide and use the method of high temperature and then low temperature on the single-tube reduction furnace Carry out hydrogen reduction, the thickness of the material layer is 4cm, the high temperature is 950°C, and the holding time is 3 hours; The performance index meets the requirements of Q / JDC013-2002 enterprise standard. image 3 It is the SEM photo of the molybdenum powder of this embodiment.

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Abstract

The invention relates to a preparation method of molybdenum powder, in particular to a process method of the molybdenum powder with even particle size, good dispersibility and no aggregates. The method is characterized by comprising the following steps: taking molybdenum dioxide as a raw material, and firstly sieving and grading the molybdenum dioxide power; respectively reducing the sieved and graded molybdenum dioxide with two temperature regions to obtain the molybdenum powder by a high temperature-first and low temperature-last hydrogen reduction process; and then sieving the prepared molybdenum powder to obtain the molybdenum powder with even particle size, good dispersibility and no aggregates. The method has simple, safe and reliable operation, and is applicable to batch productionof the molybdenum powder; and compared with the conventional molybdenum powder, the molybdenum powder prepared by the method has even particle size, good dispersibility and no aggregates and agglomeration, and is mostly present in a single particle form. Fisher particle size of the finished molybdenum powder is 2.5-4.5 mu m, and yield rate thereof is more than 90% after being sieved with a 500-mesh sieve.

Description

technical field [0001] A preparation method of molybdenum powder relates to a process method of molybdenum powder with uniform particle size, good dispersibility and no agglomeration. Background technique [0002] The relatively mature process of producing molybdenum metal products at home and abroad is the powder metallurgy method. Molybdenum powder is the raw material for preparing molybdenum deep-processed products. Its physical and chemical properties and organizational structure determine the characteristics and quality characteristics of subsequent processed products to a large extent. [0003] The relatively mature molybdenum powder production process in China is made by reducing ammonium molybdate or high-purity molybdenum trioxide through two or three stages of hydrogen reduction. Most of the domestic reduction furnaces have 5 temperature zones, and the temperature zone setting is low temperature Then high temperature and then low temperature. The molybdenum powder...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
Inventor 安耿刘仁智李晶付静波卜春阳
Owner JINDUICHENG MOLYBDENUM CO LTD
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