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 p

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

Examples

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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