Brown tungsten oxide is tungsten dioxide. Because of its brown appearance, it is called brown tungsten, also known as brown tungsten oxide. Like yellow tungsten, blue tungsten, and violet tungsten, brown tungsten oxide is a common industry name given to it based on its color appearance. Brown tungsten (tungsten dioxide WO2) is a kind of chocolate-like powder. At 575~600℃, hydrogen will reduce tungsten trioxide to produce tungsten dioxide. Brown tungsten oxide (tungsten dioxide WO2) is insoluble in water, alkaline solution, hydrochloric acid and dilute sulfuric acid. Nitric acid can convert brown tungsten oxide into high-valent oxide. Brown tungsten oxide (tungsten dioxide WO2) is quickly oxidized to tungsten trioxide in air, and turns into blue oxide when heated to 500°C in nitrogen oxide. At 1020°C, brown tungsten oxide (tungsten dioxide WO2) can be reduced to metal tungsten powder by carbon.
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