Six Kind Preparation Methods of Spherical Tungsten Powder

(Six Kind Preparation Methods of Spherical Tungsten Powder)

Spherical tungsten powder has a spherical appearance. Compared with ordinary
tungsten powder, it has the remarkable characteristics of good powder fluidity
and high tap density. Spherical tungsten powder is used as a raw material in
industries such as tungsten and tungsten alloy 3D printing, porous materials,
and high-density powder spraying, and its preparation methods have attracted
attention. So, what are the 6 preparation methods for spherical tungsten
powder?

The main methods for preparing spherical tungsten powder are as follows:

1. Using the technology of secondary oxidation and reduction of tungsten
powder, quasi-spherical tungsten powder can be obtained, and the manufacturing
cost is low, but the spheroidization is not sufficient.

2. Using the granulation and sintering method to produce spherical powder for
thermal spraying, spherical tungsten powder with a particle size of 40-750 μm
can be obtained. The density of the tungsten powder is not high, and the
particle diameter is relatively large, and the powder is relatively coarse.

3. Use tungsten hexafluoride as raw material to prepare fine-particle (3～5μm)
spherical tungsten powder. This method involves strong corrosive gas and the
production conditions are relatively harsh. In today's society, there is a high
environmental protection requirement. It still has a certain distance from
large-scale production.

4. The tungsten rod uses the rotating electrode DC arc plasma method to
prepare spherical tungsten powder. This method can only prepare coarser
particles (150-1700μm), and cannot prepare small fine spherical tungsten powder,
and the equipment cost is very expensive.

5. The large particle size (40～650μm) spherical tungsten powder is prepared
from tungsten hexafluoride by vapor deposition. Because the process involves
strong corrosive hydrofluoric acid, the production conditions are harsh and the
environmental protection requirements are high, so It is difficult to gain
widespread popularity in practical applications.

6. Using an inductively coupled plasma torch to spheroidize and air-cool Cr,
Ta, Mo, W, MgO and other powders, spherical tungsten powder can be obtained.
However, the preparation method requires a large cooling chamber, which must be
Using high-purity argon gas, the cost is very high, and the spheroidization rate
of the powder after one treatment can only reach 85%. If you want to get all
spherical powders, you need to perform multiple sorting and re-spheroidization
processes. This obviously greatly increases production costs.

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(Six Kind Preparation Methods of Spherical Tungsten Powder)