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A preparation method of special molybdenum powder for making molybdenum electrode

A kind of molybdenum powder, welding rod technology

Active Publication Date: 2017-12-26
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 special molybdenum powder for making molybdenum electrode, which solves the problems of uneven weld bead and bubbles in the actual welding process of the electrode made of molybdenum powder obtained by the existing method

Method used

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  • A preparation method of special molybdenum powder for making molybdenum electrode

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1, mix high-purity molybdenum trioxide and industrial molybdenum dioxide in a double-cone mixer for 4 hours at a mass ratio of 1:1.86 to obtain MoO 2 -MoO 3 Mixed powder; the average Fischer particle size of industrial molybdenum dioxide is 6.8μm, and the bulk density is 1.0g / cm 3 ;

[0028] Step 2, the MoO obtained in step 1 2 -MoO 3 The mixed powder is loaded into boats with a boat thickness of 3.5cm, and hydrogen gas with a dew point of -45°C flows through MoO in reverse. 2 -MoO 3 Mix the powder, and adopt a stepwise heating method in the high-temperature reduction stage. The first zone is kept for 2 hours, and the reduction temperature is 900°C; the second zone is kept for 2 hours, and the reduction temperature is 920°C; the third zone is kept for 2.5 hours, and the reduction temperature is 950°C; The fourth zone was kept warm for 2.5 hours, and the reduction temperature was 1000°C to obtain molybdenum powder;

[0029] Step 3, vibrating and breaking up th...

Embodiment 2

[0031] Step 1, mix high-purity molybdenum trioxide and industrial molybdenum dioxide in a double-cone mixer for 5 hours at a mass ratio of 1:1.5 to obtain MoO 2 -MoO 3 Mixed powder; the average Fischer particle size of industrial molybdenum dioxide is 3.5μm, and the bulk density is 1.20g / cm 3 ;

[0032] Step 2, the MoO obtained in step 1 2 -MoO 3 The mixed powder is loaded into the boat according to the boat thickness of 4.5cm, and the dew point is -30°C and the hydrogen gas is flowed through the MoO in reverse. 2 -MoO 3 Mix the powder, and adopt a stepwise heating method in the high-temperature reduction stage. The first zone is kept for 2.5 hours, and the reduction temperature is 800°C; the second zone is kept for 2 hours, and the reduction temperature is 940°C; the third zone is kept for 2 hours, and the reduction temperature is 980°C; The fourth zone was kept warm for 3 hours, and the reduction temperature was 1080°C to obtain molybdenum powder;

[0033] Step 3, vibr...

Embodiment 3

[0035] Step 1, mix high-purity molybdenum trioxide and industrial molybdenum dioxide in a double-cone mixer for 4.5 hours at a mass ratio of 1:1.67 to obtain MoO 2 -MoO 3 Mixed powder; the average Fischer particle size of industrial molybdenum dioxide is 10.2μm, and the bulk density is 1.50g / cm 3 ;

[0036] Step 2, the MoO obtained in step 1 2 -MoO 3 The mixed powder is loaded into the boat according to the thickness of the boat of 3.0cm, and the dew point is -20°C and the hydrogen gas is flowed through the MoO in reverse. 2 -MoO 3 Mix the powder, and adopt a stepwise heating method in the high-temperature reduction stage. According to the first zone for 2.2 hours, the reduction temperature is 950°C; the second zone for 2 hours, the reduction temperature is 960°C; the third zone for 2.3 hours, the reduction temperature is 995°C ; The fourth zone was kept warm for 2.8 hours, and the reduction temperature was 1020°C to obtain molybdenum powder;

[0037] Step 3, vibrating and...

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Abstract

The invention discloses a special molybdenum powder preparation method for making molybdenum electrodes. The industrial molybdenum dioxide and molybdenum trioxide are uniformly mixed by solid-solid doping to obtain MoO2-MoO3 mixed powder; then the MoO2-MoO3 mixed powder is passed through High temperature reduction generates molybdenum powder. After vibrating and dispersing the molybdenum powder, first sieve with 200 meshes, and then sieve the material on the 200-mesh sieve with 80 meshes. The molybdenum powder prepared by the preparation method of the invention removes the particles with fine particle size and most of the particles, the produced molybdenum powder particles are relatively uniform, the consistency and fluidity are stable and good, and the technical requirements of powder for welding rod are met, and the yield is high. , up to 70%.

Description

technical field [0001] The invention belongs to the technical field of molybdenum powder preparation, and in particular relates to a method for preparing special molybdenum powder for making molybdenum welding rods. Background technique [0002] Molybdenum is a refractory metal with high high-temperature strength, good electrical and thermal conductivity, and a thermal expansion coefficient similar to that of glass. It is widely used in the manufacture of core wires, leads, hooks, and wire cutting wires for spiral filaments. It is also used in electronic tubes. As a gate and anode support material, molybdenum is used as a metal oxide semiconductor gate, various electrodes, and targets in VLSI, but molybdenum and molybdenum alloys have high melting points and difficult welding of workpieces. [0003] At present, conventional molybdenum powder production enterprises use ammonium molybdate or high-purity molybdenum trioxide as raw materials for two-stage or three-stage hydrogen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 赵新瑞付绍军张增祥左翀程进陈宇娟王沛丽
Owner JINDUICHENG MOLYBDENUM CO LTD