Ammonium Paratungstate Used for Preparing Tungsten Carbide Wear-Resistant Coating

Wear-resistant coating is a kind of new functional coating with special function, such as good abrasion resistance. Tungsten carbide (WC), the kind of important hard alloy material, is a black six square crystal with metallic luster, which the hardness is similar to diamond. Because the properties tungsten has, it is increasingly becoming an important strategic significance material. A method for preparing tungsten carbide wear-resistant coating from ammonium paratungstate (APT) is presented in this paper.

Specific steps:
1. Calcining ammonium paratungstate to prepare tungsten oxide powder, control the temperature at 650~750℃;
2. Place the tungsten oxide powder in the reaction vessel, and adding one of alcohol, acetic acid and acetone, or the mixture of them, filter and get the light yellow tungsten oxide sol;
3. Heated and stirred to evaporate, and then the tungsten oxide gel was prepared;
4. Soaking hard alloy in he tungsten oxide gel, filming by dip-coating method, keeping the speed at 50~200mm/min;
5. Hard alloy coated with tungsten oxide nano film was prepared by drying and cooling;
6. Carbonization the hard alloy plated with tungsten oxide nano film in the reduction furnace full of reducing gas, which is carbide mixture gas of H₂ and C₂H₂, temperature controlled at 950~1200℃ for 3~5 hours, then  get the hard alloy plated with tungsten carbide wear-resistant coating.

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