Tungsten powder is kind of powder of metal Tungsten, is the important raw material of the preparation of Tungsten processing materials, Tungsten alloy and Tungsten products and so on.
The preparation method of Tungsten powder:
By the methods of hydrogen reduction is of Tungsten oxide and ammonium paratungstate preparation. In the first round of 500 to 700℃ temperatures, Tungsten trioxide can be into Tungsten dioxide. The second stage at 700 to 900℃ temperatures, Tungsten dioxide can be into Tungsten powder. Reduction is in pipe - type electric furnace or in the Rotary furnace. Restore the performance of Tungsten powder ( such as purity, such as particle size, particle size composition ) depends largely on the restore process. When you restore the Tungsten powder in tube furnace, restore the main parameters affecting the reduction rate is temperature, Tungsten oxide load in the boat, boat moving speed, the hydrogen in the hydrogen flow rate and moisture content. With higher reduction temperature, Tungsten powder granularity becomes bold.
In addition to hydrogen reduction of production of Tungsten powder and early use of Tungsten oxide is of carbon reduction, reduction temperature higher than 1050℃. Lower purity Tungsten powder can be obtained in this way. In addition, aluminum, calcium, zinc and other metals study on reduction of Tungsten oxide is also a work in progress. For special applications requiring high purity Tungsten powder, ultra-fine-grain, then developed a method of Tungsten, hydrogen chloride, are Tungsten powder and particle size may be less than 0.05 μg/m.
The performance and standard of Tungsten powder:
1. Tungsten powder in addition to have certain requirements on the impurity content, oxygen content should be controlled in a certain range.
2. Commonly used Tungsten powder size general average particle size of 2 to 10 μ M.
3. Tungsten powder is for polygonal particle shape.
4. In addition, Tungsten powder specific surface area, bulk density, tap density also varies in a certain range.
Properties of Tungsten powder on production of Tungsten materials and quality has a direct effect of Tungsten powder metallurgy products, in particular the purity and particle size effect more visible.
The preparation method of Tungsten powder:
By the methods of hydrogen reduction is of Tungsten oxide and ammonium paratungstate preparation. In the first round of 500 to 700℃ temperatures, Tungsten trioxide can be into Tungsten dioxide. The second stage at 700 to 900℃ temperatures, Tungsten dioxide can be into Tungsten powder. Reduction is in pipe - type electric furnace or in the Rotary furnace. Restore the performance of Tungsten powder ( such as purity, such as particle size, particle size composition ) depends largely on the restore process. When you restore the Tungsten powder in tube furnace, restore the main parameters affecting the reduction rate is temperature, Tungsten oxide load in the boat, boat moving speed, the hydrogen in the hydrogen flow rate and moisture content. With higher reduction temperature, Tungsten powder granularity becomes bold.
In addition to hydrogen reduction of production of Tungsten powder and early use of Tungsten oxide is of carbon reduction, reduction temperature higher than 1050℃. Lower purity Tungsten powder can be obtained in this way. In addition, aluminum, calcium, zinc and other metals study on reduction of Tungsten oxide is also a work in progress. For special applications requiring high purity Tungsten powder, ultra-fine-grain, then developed a method of Tungsten, hydrogen chloride, are Tungsten powder and particle size may be less than 0.05 μg/m.
The performance and standard of Tungsten powder:
1. Tungsten powder in addition to have certain requirements on the impurity content, oxygen content should be controlled in a certain range.
2. Commonly used Tungsten powder size general average particle size of 2 to 10 μ M.
3. Tungsten powder is for polygonal particle shape.
4. In addition, Tungsten powder specific surface area, bulk density, tap density also varies in a certain range.
Properties of Tungsten powder on production of Tungsten materials and quality has a direct effect of Tungsten powder metallurgy products, in particular the purity and particle size effect more visible.