Blue Tungsten Oxide’s Oxygen Index and Colors

Oxygen index have certain impact on the performance and morphology of blue tungsten oxide, researcher determination of oxygen index of blue tungsten oxide by weight method. After experimental data analysis found that the baking temperature has great impact on oxygen content and the color of blue tungsten oxide. When baking temperature at 350 ~ 500 ℃, the oxygen index between 2.96-2.90. Changing the baking temperature, the color and oxygen content of blue tungsten oxide also will change and surface gloss index has varying degrees of change.

At 350 ℃, blue tungsten oxide’s color is yellow-blue and has high oxygen index, matte. As the temperature increases, blue tungsten oxide gradually be reduced, when the baking temperature reaches at 450 ℃blue tungsten oxide’s color translated into blue-black and surface of it has metal light, oxygen index of 2.94. When baking temperature reached 500 ℃, oxygen index of 2.90, blue tungsten oxide color is blue-black. As the temperature continues to rise in parts of blue tungsten oxide restore into WO2.72 , then the blue color of blue tungsten oxide become more deepen and oxygen index further reducing. When baking temperature reaches 550 ℃, it began to appear purple WO2.72, but most retain the blue color which to form a heterogeneous mixture.