Application and production method of tungsten powder
Tungsten powder is a kind of powder metal tungsten. It is the main raw material of powder metallurgy tungsten products and tungsten alloy processing. Let's take a look at the use of tungsten powder and production methods.
Tungsten powder used
Tungsten powder is widely used in industry and daily life. Here are 5 common uses for tungsten powder.
1. It is the raw material for making tungsten carbide powder. This is one of the important uses of tungsten powder. In recent years, the emergence of ultra-fine grained cemented carbides is a good tool for cutting new and difficult materials such as titanium alloys, heat-resistant steels, nickel-based alloys and drill-based alloys, especially for turning tools, milling tools, drill bits and dies.
2. Pure tungsten powder can be made into suitable processing materials such as wire, rod, tube, plate and other products with a certain shape.
3. Tungsten powder mixed with other metal powder, after a certain molding process, can be made into a variety of tungsten alloy, such as tungsten-molybdenum alloy, tungsten-rhenium alloy, tungsten-copper alloy, high-density tungsten alloy, etc.
4. In the thermal spraying welding process, tungsten powder can also be used as thermal spraying tungsten powder. The principle is that, although it is difficult to melt the tungsten metal powder directly with a gaseous flame, the fused alloy can bond the tungsten powder firmly to the blank after the flame is melted.
5. Tungsten powder can be sintered into a variety of porous filters.
The production method of tungsten powder
1. Hydrogen reduction
The method is to obtain tungsten powder by reducing tungsten trioxide or ammonium para tungstate with hydrogen. The process of preparing tungsten powder by hydrogen reduction method is generally divided into two stages:
In the first stage, tungsten trioxide is reduced to tungsten dioxide at temperatures of 500-700 ° C. In the second stage, tungsten dioxide is reduced to tungsten powder at a temperature of 700-900℃. Reduction reactions are usually carried out in tubular or rotary furnaces.
2. Tungsten oxide carbon reduction method
In addition to the hydrogen reduction method, the carbon reduction method of tungsten oxide was also used to prepare tungsten powder. The reduction temperature was higher than 1050℃. The tungsten powder obtained by this method is of low purity.
Tungsten supplier
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