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Preparation method for highly-dispersed ultrafine molybdenum powder with narrow particle size distribution

A technology of ultra-fine molybdenum powder with narrow particle size distribution, applied in the preparation of ultra-fine molybdenum powder with narrow particle size distribution, in the field of high dispersion, can solve the problems of high cost and serious agglomeration of molybdenum powder

Active Publication Date: 2016-04-06
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing ultra-fine molybdenum powder with high dispersion and narrow particle size distribution, which solves the problems of serious agglomeration and high cost of molybdenum powder prepared by the existing method

Method used

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  • Preparation method for highly-dispersed ultrafine molybdenum powder with narrow particle size distribution
  • Preparation method for highly-dispersed ultrafine molybdenum powder with narrow particle size distribution
  • Preparation method for highly-dispersed ultrafine molybdenum powder with narrow particle size distribution

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Experimental program
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Effect test

Embodiment 1

[0021] Put the molybdenum trioxide powder produced by the sublimation method into a molybdenum boat, and perform a one-stage reduction. The reduction temperature is 450°C, using dry hydrogen, the hydrogen dew point is -60°C, and the hydrogen flow rate is 2m 3 / h, add molybdenum trioxide 100g / boat to the material boat, and push the boat at a speed of 30min / boat to complete the first-stage reduction of molybdenum oxide. After the completion, put the material boat in the furnace to cool to room temperature, and then sieve it. The product of one-stage reduction is molybdenum dioxide with regular and uniform flakes. Then carry out the second-stage reduction, the process reduction temperature is 700°C, the boat loading capacity is 200g / boat, and the hydrogen flow rate is 2m 3 / h, hydrogen dew point -30°C, boat pushing speed 30min / boat to achieve two-stage reduction, after the completion of the material boat placed in the cooling zone nitrogen cooling, screening, testing, packaging. ...

Embodiment 2

[0023] Put the molybdenum trioxide powder produced by the sublimation method into a molybdenum boat, and perform a one-stage reduction. The first-stage reduction temperature is 500°C, using dry hydrogen, the hydrogen dew point is -60°C, and the hydrogen flow rate is 1.8m 3 / h, add molybdenum trioxide 120g / boat to the material boat, and push the boat at a speed of 35min / boat to complete the first-stage reduction of molybdenum oxide. After the completion, put the material boat in the furnace to cool to room temperature, and then sieve it. The product of one-stage reduction is molybdenum dioxide with regular and uniform flakes. Then carry out the second-stage reduction, the process reduction temperature is 750°C, the loading capacity of the boat is 150g / boat, and the hydrogen flow rate is 1.5m 3 / h, hydrogen dew point 0°C, boat pushing speed 30min / boat to achieve two-stage reduction, after the completion of the material boat placed in the cooling zone nitrogen cooling, screening,...

Embodiment 3

[0025] Put the molybdenum trioxide powder produced by the sublimation method into a molybdenum boat, and carry out one-stage reduction. The first-stage reduction temperature is 500°C, using dry hydrogen, the hydrogen dew point is -60°C, and the hydrogen flow rate is 1.5m 3 / h, add molybdenum trioxide 100g / boat to the material boat, and complete the one-stage reduction of molybdenum oxide at a speed of 25min / boat. After the completion, put the material boat in the furnace and cool it to room temperature. Molybdenum dioxide, sieve the molybdenum dioxide. Then carry out the second-stage reduction, the process reduction temperature is 800°C, the loading capacity of the boat is 180g / boat, and the hydrogen flow rate is 1.0m 3 / h, hydrogen dew point 8 ℃, boat pushing speed 25min / boat to achieve two-stage reduction, after the completion of the material boat placed in the cooling zone nitrogen cooling, screening, testing, packaging. The tested molybdenum powder Fisher particle size is...

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Abstract

The invention discloses a preparation method for highly-dispersed ultrafine molybdenum powder with narrow particle size distribution. The preparation method comprises the following steps: filling molybdenum trioxide powder produced by a sublimation method into a molybdenum boat, carrying out first-section reduction on the molybdenum trioxide powder, then, cooling the molybdenum trioxide powder to the room temperature in a furnace; then, carrying out second-section reduction on the molybdenum trioxide powder, charging nitrogen into a cooling zone to cool the molybdenum trioxide powder, and screening to obtain the highly-dispersed ultrafine molybdenum powder with narrow particle size distribution. According to the preparation method for the highly-dispersed ultrafine molybdenum powder with narrow particle size distribution, the sublimated molybdenum trioxide is used as a raw material, hydrogen gas is adopted for reducing, dry hydrogen is adopted at the first-section reduction, and flow of the hydrogen gas is relatively great, so that sheet-shaped molybdenum dioxide is realized, and the formation of regular ultrafine molybdenum powder is facilitated; wet hydrogen with a hydrogen dew point of (-)30 DEG C to 20 DEG C is adopted for the second-section reduction, and the reduction temperature and the flow of the hydrogen gas are regulated, so that production for single-particle and highly-dispersed ultrafine molybdenum powder with narrow particle size distribution can be realized.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a method for preparing ultrafine molybdenum powder with high dispersion and narrow particle size distribution. Background technique [0002] Ultrafine / micro-nanometer molybdenum powder, due to its small particle size, is widely used in magnetic materials, electronic materials, optical materials, sintering of high-density materials, catalysis, and sensing. The size of its particle scale is one of the keys to research. Although there are many methods for preparing ultra-fine and nano-molybdenum powders at home and abroad, most of them have not been mass-produced because of high equipment requirements, difficult process parameter control, and high production costs. [0003] There is also research on large-scale production of ultra-fine / nano molybdenum powder, the application number is 200810103883.3 (application date: 2005.04.11, publication date: 2008.08.2...

Claims

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Application Information

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IPC IPC(8): B22F9/22B22F1/00
CPCB22F1/0003B22F9/22B22F2999/00B22F2201/013
Inventor 杨秦莉庄飞卜春阳席莎
Owner JINDUICHENG MOLYBDENUM CO LTD
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