CAS 1314-35-8 Tungsten Oxide WO3 99.999% Powder For Tungsten Metal / Steel Production

Tungsten Oxide (WO₃): Tungsten Metal/steel Production, Ceramic Pigments, and Electrochromic Catalysts

Tungsten trioxide (WO₃, also called tungsten bloom) and blue tungsten oxide are currently the two most common tungsten oxides. Tungsten trioxide is a light yellow triclinic powder crystal. When heated above 740°C, it transforms into orange tetragonal crystals, reverting upon cooling. It is stable in air with melting point 1473°C, boiling point above 1750°C, and relative density 7.16.

WO₃ is the most stable tungsten oxide, insoluble in water and inorganic acids except hydrofluoric acid. It dissolves in hot concentrated sodium hydroxide and ammonia solutions to form soluble tungstates. It can be reduced by H₂ above 650°C and by carbon at 1000-1100°C to produce tungsten powder.

Applications

1. For manufacturing metallic tungsten and alloy steels
2. For ceramic coloring agents
3. For catalysts
4. For special optical crystals
5. For fireproof fabrics

Product Series

Health and Safety Information

Packaging Specifications

• Standard packaging: 50 kg/drum, 500 kg/pallet, ton bags
• Sample packaging: 500 g/bag, 1 kg/bottle

About Tungsten Oxide Production

The hydrogen reduction method for tungsten trioxide, also known as the yellow tungsten process, is commonly used in industrial production through continuous countercurrent hydrogen reduction. For producing medium or medium-fine tungsten powder with relatively uniform particle size, a two-stage reduction process is typically employed: the first stage reduces WO₃ to WO₂, and the second stage reduces WO₂ to W. For producing coarse tungsten powder, a single-stage reduction process is used, directly reducing WO₃ to W.

The process parameters for producing medium and fine tungsten powder are determined based on the following principles:

1. Using relatively low reduction temperatures;
2. Maintaining a stable temperature gradient along the furnace tube;
3. Implementing slower boat pushing speeds;
4. Using smaller boat loading capacities or thinner material layers;
5. Applying higher hydrogen flow rates with lower humidity levels;
6. Utilizing finer WO₃ raw material particles.

For coarse tungsten powder production using the single-stage direct reduction method, the process parameters follow these principles:

1. Using higher reduction temperatures;
2. Maintaining a steeper temperature gradient along the furnace tube;
3. Implementing faster boat pushing speeds;
4. Using larger boat loading capacities or thicker material layers;
5. Applying lower hydrogen flow rates with higher humidity levels.