What Effect does Tungsten Trioxide Raw Material Have on the Performance of Tungsten Powder?

(What Effect does Tungsten Trioxide Raw Material Have on the Performance of Tungsten Powder?)

What is tungsten oxide?

Tungsten oxide (Tungsten trioxide) is a powder metallurgical raw material for
cemented carbide and tungsten products. According to the national standard (GB/T
3457-1998), there are two types: tungsten trioxide (yellow tungsten for short),
with the molecular formula WO3, and blue tungsten oxide (blue tungsten for
short, which is a mixed tungsten oxide). W20O58. Yellow tungsten is a light
yellow crystalline powder, and blue tungsten is dark blue or blue-black
crystalline powder.

The influence of tungsten oxide raw materials on the properties of tungsten
powder

As we all know, many factors affect the performance of tungsten powder.
Still, the main factors are nothing more than the production process of W
powder, the properties and characteristics of raw materials used, and so on.
Generally, more research on the Effect of the reduction process on tungsten
powder's performance, including the reduction temperature, boat pushing speed,
boat loading and methods, and reducing atmosphere.

However, in production and research, researchers found that the properties of
different tungsten oxide raw materials also have a more significant impact on
tungsten powder's performance. Next, let's examine the influence of tungsten
trioxide raw materials (yellow tungsten trioxide WO3, blue tungsten oxide
WO2.98, purple tungsten oxide WO2.72 and tungsten dioxide WO2) on the properties
of W powder.

(1) The difference in the characteristics of different tungsten oxide raw
materials directly determines the sizes and composition of the tungsten powder,
the physical properties such as compatibility and formability, the content of
impurity elements the morphology and structure of the W powder. In actual
production, the raw materials should be selected according to tungsten powder
requirements when choosing raw materials, which helps to ensure products quality
and achieve good economic benefits.

(2) The oxygen content in the raw material of tungsten trioxide is positively
correlated with the Fsss of the tungsten powder. The purple WO3 with lower
oxygen content should be selected as the raw material for ultrafine tungsten
powder production. The yellow with high oxygen content should be chosen for the
production of coarser W powder. Tungsten trioxide and blue tungsten oxide are
used as raw materials.

(3) The tighter particle structure of the tungsten trioxide raw material, the
slower the reduction rate, the coarser the W powder produced, and the wider the
particle size distribution. To make tungsten powder with high concentration, it
is advisable to choose oxide raw materials with a single raw material phase
composition and a loose internal structure and uniform particles.

(4) To produce tungsten products and tungsten products with superior
performance requirements, it is better to choose specially treated tungsten
oxide or purple tungsten oxide as raw materials.

Pure tungsten powder can be made into processed materials such as wires,
rods, tubes, plates and products with specific shapes. Besides, W powder mixed
with other metal powder can also be made into various tungsten alloys, such as
tungsten-molybdenum alloy, tungsten rhenium alloy, tungsten copper alloy and
high-density tungsten alloy.

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(What Effect does Tungsten Trioxide Raw Material Have on the Performance of Tungsten Powder?)