Preparation method of tungsten powder used for high-density alloy

A high-density, tungsten powder technology, which is applied in the field of preparation of tungsten powder for high-density alloys, can solve problems such as equipment and environmental adverse effects, and achieve the effects of low cost, complete development, and extended cooling time

Active Publication Date: 2019-01-25
ZIGONG CEMENTED CARBIDE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this invention is that the tungsten powder needs to be re-oxidized, and at the same time, it needs to use an alkaline solution, which will have adverse effects on equipment and the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A preparation method of tungsten powder for high-density alloys, comprising the steps of:

[0037] Step 1 Preparation of Tungsten Oxide with High Specific Surface Area

[0038] The raw material is calcined into tungsten oxide in a rotary furnace, the raw material is ammonium paratungstate after drying and dehydration; the rotary furnace is a single-tube furnace, which can meet the high temperature and sealing requirements; the calcining process is: the calcining temperature is 700-800 °C, Calcination atmosphere is N 2 +H 2 mixture, the concentration ratio is N 2 Gas 60~90%, the balance is H 2 gas. Mixed gas flow rate is 0.4~1.0Nm 3 / h.

[0039] The characteristics of the tungsten oxide: specific surface area ≥ 10m 2 / g, the ratio of oxygen to tungsten atoms in tungsten oxide is 2.94~3.0:1.0, the color is blue or light blue, and the Fischer particle size of tungsten oxide is 10.0~20.0μm

[0040] Step 2 Load the boat

[0041] Put the tungsten oxide raw material i...

Embodiment 2

[0050] A kind of preparation method of tungsten powder for high-density alloy, it is different from embodiment 1 in the following steps:

[0051] Step 1 Preparation of Tungsten Oxide with High Specific Surface Area

[0052] Raw material calcination process: calcination temperature is 600-800℃, calcination atmosphere is N 2 +H 2 mixture, the concentration ratio is N 2 Gas 60~90%, the balance is H 2 gas. Mixed gas flow rate is 1.8~2.0Nm 3 / h.

[0053] The prepared tungsten oxide has a large specific surface area, and compared with Example 1, the yield is increased by 10-15%.

Embodiment 3

[0055] A preparation method of tungsten powder for high-density alloys, its steps 1-4 are the same as in embodiment 1, and further includes step 5, combining batches, grouping different batches of sieved tungsten powder into batches, and grouping The tungsten powder is mixed in a mixer to obtain the finished tungsten powder, and the mixing time is controlled within 10 to 60 minutes.

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Abstract

The invention belongs to the technical field of powder metallurgy, and specifically relates to a preparation method of tungsten powder used for high-density alloy. The method specifically includes thefollowing steps that high-specific-surface-area tungsten oxide preparation, boat loading, reduction, cooling and sieving. The high-specific-surface-area tungsten oxide is prepared through ammonium paratungstate, hydrogen serves as a reducing agent, the high-specific-surface-area tungsten oxide can be reduced tungsten powder at high temperature more than 800 DEG C, the reduced tungsten powder is cooled in multi-stage mode, and finally, the tungsten powder is subjected to ultrasonic sieving to obtain near-spherical tungsten powder, wherein grain growth is complete, the tungsten powder is full,the activity is low, the dispersion property is good and the tungsten powder has particle morphology.

Description

technical field [0001] The invention belongs to the field of powder metallurgy powder preparation and provides a method for preparing tungsten powder for high-density alloys. Background technique [0002] High-density alloy is an alloy based on tungsten (the mass fraction of tungsten is 90% to 98%), with iron group elements and a small amount of other elements as the binder phase, usually using powder metallurgy method, after powder making, mixing , Pressing, sintering and post-processing processes. High-density alloys have excellent properties such as high density, high strength and hardness, small thermal expansion coefficient, good electrical and thermal conductivity, good corrosion and oxidation resistance, good machinability and weldability, and are widely used in the defense industry and civilian industry. has been widely used. For example, it is used as gyro rotor and inertial rotating element in the aviation industry, as a kinetic energy armor-piercing projectile c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/22
CPCB22F9/22
Inventor 张华民
Owner ZIGONG CEMENTED CARBIDE CORP
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