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Preparation method of molybdenum powder

A molybdenum powder and powder technology, which is applied in the field of rare metal powder metallurgy, can solve the problems of poor material consistency, short service life, and low strength of molybdenum-copper alloy compacts, and achieve good material consistency, long service life and high yield Effect

Inactive Publication Date: 2012-07-25
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the flexural strength of molybdenum materials for industrial use is only 1.0MPa to 4.0MPa, and the molybdenum-copper alloy compacts produced have low strength, poor material consistency, and short service life, so they cannot be used as brake heat dissipation materials.

Method used

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

Examples

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Embodiment 1

[0027] The preparation method of the present embodiment comprises the following steps:

[0028] Step 1, passing molybdenum trioxide with a mass purity of 99.95% through a 40-mesh sieve to obtain molybdenum trioxide powder; the average Fischer particle size of the molybdenum trioxide is 4.0 μm, and the average bulk density is 1.0 g / cm 3 ;

[0029] Step 2, the molybdenum trioxide powder described in step 1 is loaded into the material boat with the loading capacity of 2.0kg / boat, and the molybdenum trioxide powder in the material boat is carried out a hydrogen reduction in the reduction four temperature zones of the primary reduction furnace, Push the boat once every 30min, after the primary hydrogen reduction finishes, the material boat is cooled to room temperature in the cooling zone of the primary reduction furnace, and the primary redox product molybdenum dioxide is obtained in the material boat; the initial temperature of the primary hydrogen reduction is 340°C, the final ...

Embodiment 2

[0037] The preparation method of the present embodiment comprises the following steps:

[0038] Step 1, passing molybdenum trioxide with a mass purity of 99.97% through a 40-mesh sieve to obtain molybdenum trioxide powder; the average Fischer particle size of the molybdenum trioxide is 6.0 μm, and the average bulk density is 1.2 g / cm 3 ;

[0039] Step 2, the molybdenum trioxide powder described in step 1 is loaded into the material boat with the loading capacity of 3.0kg / boat, and the molybdenum trioxide powder in the material boat is carried out a hydrogen reduction in the reduction five-temperature zone of the primary reduction furnace, Push the boat once every 30min, after the primary hydrogen reduction finishes, the material boat is cooled to room temperature in the cooling zone of the primary reduction furnace, and the primary redox product molybdenum dioxide is obtained in the material boat; the initial temperature of the primary hydrogen reduction is 340°C, the final t...

Embodiment 3

[0046] The preparation method of the present embodiment comprises the following steps:

[0047] Step 1, passing molybdenum trioxide with a mass purity of 99.98% through a 40-mesh sieve to obtain molybdenum trioxide powder; the average Fischer particle size of the molybdenum trioxide is 9.0 μm, and the average bulk density is 1.4 g / cm 3 ;

[0048] Step 2, the molybdenum trioxide powder described in the step 1 is loaded into the material boat with the loading capacity of 4.0kg / boat, and the molybdenum trioxide powder in the material boat is carried out a hydrogen reduction in the reduction five temperature zones of the primary reduction furnace, Push the boat once every 30min, after the primary hydrogen reduction finishes, the material boat is cooled to room temperature in the cooling zone of the primary reduction furnace, and the primary redox product molybdenum dioxide is obtained in the material boat; the initial temperature of the primary hydrogen reduction is 600°C, the fi...

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Abstract

The invention discloses a preparation method of molybdenum powder, comprising the following steps of: firstly, sieving the raw material of molybdenum trioxide to obtain molybdenum trioxide powder; secondly, carrying out primary reductive reaction on the molybdenum trioxide powder and hydrogen gas in a primary reduction furnace to generate molybdenum dioxide; thirdly, carrying out secondary reductive reaction on molybdenum dioxide and hydrogen gas in a secondary reduction furnace to generate rough molybdenum powder; and fourthly, sieving the rough molybdenum powder and mixing to obtain the finished molybdenum powder. The preparation method provided by the invention is easy to control, simple and convenient to operate, safe and reliable and suitable for industrial mass production. A molybdenum block pressed by using the molybdenum powder prepared by using the preparation method provided by the invention is high in flexural strength, and the prepared molybdenum and copper alloy is high in yield, good in material consistency, long in service life and capable of being used as a braking / heat radiating material.

Description

technical field [0001] The invention belongs to the technical field of rare metal powder metallurgy, and in particular relates to a method for preparing molybdenum powder. Background technique [0002] Molybdenum powder and molybdenum alloys have good high-temperature strength, high-temperature hardness, and excellent electrical conductivity, thermal conductivity, and corrosion resistance, and are widely used in various fields such as food, papermaking, textiles, metallurgy, medicine, and aerospace. [0003] At present, industrial production generally adopts hydrogen reduction method to prepare molybdenum powder, which involves complicated physical and chemical changes, such as the selection of raw materials, the time and temperature of reduction reaction, the loading capacity of the boat and the speed of pushing the boat, and the process of screening and mixing materials. Parameters and many other factors will significantly affect the quality of molybdenum powder, and then ...

Claims

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Application Information

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IPC IPC(8): B22F9/28
Inventor 韩强张增祥赵新瑞左翀党永平
Owner JINDUICHENG MOLYBDENUM CO LTD
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