A Oxide Reduction Method of Tungsten

Tungsten oxide behavior at high temperatures

Tungsten oxide, can be stable in four: (1) tungsten oxide yellow; (2) blue tungsten oxide; (3) purple tungsten oxide; (4) of tungsten oxide Brown

Hydrogen Reduction of Tungsten Oxide Thermodynamic Analysis

WO3 +3 H2 = W +3 H2O The overall reaction is endothermic reaction, the temperature increases the equilibrium constant Kp = PH2O/PH2, is advantageous to the reaction. Temperature, the equilibrium concentration of water vapor in the gas phase increases, the reaction proceeds more completely.

Tungsten Oxide Hydrogen Reduction Kinetics Analysis

Thermodynamics of the reaction can be determined, but the actual process far from equilibrium conditions, WO3 hydrogen reduction process does not strictly follow the step by step to restore order. α-W and β-W is W two allotropic crystal. α-W is a cubic crystal, lattice constant of 0. 316nm; pW cubic crystal lattice constant of 0.5036nmoβ-W is the temperature below 823K from the WO2 reduction with hydrogen, which is characterized by a large chemical activity, spontaneous combustion . β-W converted to α-W transition temperature was 798K, does not occur α-W converted to β-W in the reverse transformation. β-W is tungsten atoms of the crystal, but due to the presence of impurities and lattice distortion.

Tungsten Powder Particle Size and Purity Influence Factors

Tungsten particles into a particle and the second particle. The primary particles is a single particle, is first generated and separated from each other and independent of the presence of the particles; secondary particles of two or more of primary particles with particle accumulation easily separated.

Tungsten powder particle size and purity influence of many factors, the following factors will be analyzed as follows: raw materials, water, impurity elements, hydrogen


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