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A kind of preparation method of spherical tungsten powder

A tungsten powder and spherical technology, which is applied in the field of spherical tungsten powder preparation, can solve the problems of difficult control of parameters, high energy consumption, poor consistency, etc., and achieve the effect of simple processing method and process flow, high surface finish and easy control of parameters

Inactive Publication Date: 2016-08-17
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical methods mainly include the arc spray gun method and the plasma method. Among them, the equipment of the arc spray gun method is relatively simple, but the product quality is not stable enough, the consistency is poor, and it is not conducive to industrial production; the plasma method has high concentration of plasma energy and is convenient and flexible to use. High heat utilization rate, high purity, high sphericity, etc., but high energy consumption and complicated equipment
The chemical methods mainly include vapor phase deposition method, tungsten powder reoxidation-reduction method, ammonium paratungstate cyclic redox method and ammonium tungstate supergene stirring-drying-reduction method, but the common problem is that the process route is long and the parameters are not easy to control. Waste liquid pollution, not suitable for industrial production

Method used

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  • A kind of preparation method of spherical tungsten powder
  • A kind of preparation method of spherical tungsten powder
  • A kind of preparation method of spherical tungsten powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Weigh 1 kg of tungsten powder particles and oxidize them in a sintering furnace at 550°C for 60 minutes;

[0023] 2) Move the powder particles in step 1 into the spheroidizing equipment, and perform spheroidizing and shaping treatment on the local tungsten oxide powder under the conditions of a rotating speed of 5000r / min and a processing time of 60min;

[0024] 3) Sieve the tungsten powder particles after the spheroidization treatment in step 2 to obtain spherical tungsten powder with uniform particle size;

[0025] 4) Put the nearly spherical tungsten powder in step 3 into the reduction furnace for reduction, the reduction temperature is 650°C, and the reduction time is 40 minutes. Thereby making spherical tungsten powder particles (see figure 2 ).

Embodiment 2

[0027] 1) Weigh 2 kg of tungsten powder particles and oxidize them in a sintering furnace at 550°C for 30 minutes;

[0028] 2) Move the powder particles in step 1 into the spheroidizing equipment, and carry out spheroidizing and shaping treatment on the tungsten powder under the conditions of a rotating speed of 3000r / min and a processing time of 60min;

[0029] 3) Sieve the tungsten oxide powder particles after the spheroidization treatment in step 2 to obtain spherical tungsten powder with uniform particle size;

[0030] 4) Put the nearly spherical tungsten powder particles in step 3 into a reduction furnace for reduction, the reduction temperature is 650°C, and the reduction time is 20 minutes. Thereby making spherical tungsten powder particles (see image 3 ).

Embodiment 3

[0032] 1) Weigh 1.5kg tungsten powder particles and oxidize them in a sintering furnace at 350°C for 60min;

[0033] 2) Move the powder particles in step 1 into the spheroidizing equipment, and carry out spheroidizing and shaping treatment on the tungsten powder under the conditions of a rotating speed of 5000r / min and a processing time of 30min;

[0034] 3) Sieve the tungsten powder particles after the spheroidization treatment in step 2 to obtain spherical tungsten powder with uniform particle size;

[0035] 4) Put the spherical tungsten powder in step 3 into the reduction furnace for reduction, the reduction temperature is 650°C, and the reduction time is 20 minutes. Spherical tungsten powder particles with uniform particle size distribution are obtained.

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Abstract

The invention discloses a preparation method of spherical tungsten powder, which belongs to the field of powder preparation. First select the reduced tungsten powder particles and oxidize them at 350~550°C for 30 min~2 h, then put the oxidized powder into the spheroidization device, under the condition of the rotating speed of 3000~5000r / min and the time of 5~120min The granular tungsten powder is shaped and sieved to obtain nearly spherical tungsten powder particles. Because the protruding edges and corners of tungsten powder have large specific surface area, high chemical activity, and low activation energy, the oxidation rate during the oxidation process is higher than that of other parts of the tungsten powder surface. The tungsten oxide is hard and brittle, and it is easier to fall off during plastic surgery, and tungsten has a certain degree of metal ductility, so you can get spherical tungsten powder particles with a higher surface finish than the original tungsten powder particles. The invention greatly simplifies the production technology of spherical tungsten powder, the preparation technology is simple, the parameter control is convenient, the energy consumption is low, and no secondary pollution will be generated, and no acidic or alkaline solution is used in the treatment process, so the treatment is more environmentally friendly and cost-effective. Low.

Description

technical field [0001] The invention discloses a preparation method of spherical tungsten powder, which belongs to the field of powder preparation. Background technique [0002] Due to its good corrosion resistance, high melting point, small expansion coefficient and high elastic modulus, tungsten and its alloys are also widely used in the preparation of thermal spraying, porous materials and injection molding powder metallurgy. Armor-piercing projectile cores, sweating materials and other aerospace, weapon manufacturing and other fields. The tungsten powder commonly used in the industry is obtained by reducing tungsten oxide with hydrogen. The tungsten powder obtained by reduction has irregular particle shape, poor powder fluidity and low bulk density. With the development of science and technology, new requirements are put forward for the raw material tungsten powder. Spherical tungsten powder has attracted extensive attention due to its excellent performance. The porous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/22B22F1/00
Inventor 贾成厂王聪聪盖国胜杨玉芬崔照雯
Owner UNIV OF SCI & TECH BEIJING