Nano violet tungsten oxide powder may be applied in thermal insulating glass in the form of heat insulation film. Nano grain size violet tungsten oxide can also be used as one of the raw materials for preparing nano WC-Co composite powder by violet tungsten oxide spray drying-direct carbonization method. Other raw materials used are cobalt acetate, organic carbon (carbon content≥40%, soluble in water) and ultrapure carbon black.
Preparation of Nano WC-Co Composite Powder by Violet Tungsten Oxide Spray Drying-Direct Carbonization Method
1. Use WC-6%Co as the basic component, calculate the amount of the raw materials, including violet tungsten oxide, cobalt acetate, organic carbon and ultra-pure carbon black. Weigh and add appropriate amount of raw materials into the tilting rolling ball mill with pure water, wet grinding for 12h to form composite salt slurry, and then mix well.
2. Spray drying in a spray drying tower with an inlet air temperature of 230°C, an outlet air temperature of 125°C, a feed rate of 60mL/min, and a centrifuge speed of 12,000r/min.
3. The spray-dried powder was loaded into a boat (200g), pushed into a high temperature molybdenum wire furnace, hydrogen gas was introduced, calcination temperature was 950°C, calcination time was 30min, and WC-Co composite powder was prepared.
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