Method for compounding WC-based nano composite powder by precursor method
A composite powder and nanocomposite technology, applied in the direction of nanotechnology, can solve problems such as particle agglomeration and complex process routes, and achieve the effects of reducing reaction temperature, simple process, and simplified production process
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Embodiment 1
[0025] Dissolve 32.0% ammonium paratungstate, 11.7% cobalt nitrate, 56.0% glucose and water-soluble vanadium / chromium mixed salt (0.1% ammonium metavanadate and 0.2% ammonium dichromate) in deionized In water, prepare a mixed solution. The mixed solution was stirred evenly with a glass rod, heated and dried in a drying oven (200°C, 2h) to obtain a precursor composite powder containing a tungsten source, a cobalt source, a chromium source, a vanadium source and a carbon source. Finally, the precursor composite powder was microwave sintered under the protection of argon atmosphere. At different reaction temperatures (900-1200 °C) and holding times (1-2.5 h), the average particle size was less than 100 nm and the particle size distribution was uniform. WC-based composite powder.
Embodiment 2
[0027] Dissolve 35.0% ammonium metatungstate, 12.5% cobalt nitrate, 52.0% sucrose and water-soluble vanadium / chromium mixed salt (0.2% ammonium metavanadate and 0.3% ammonium dichromate) Ionized water to prepare a mixed solution. The mixed solution was stirred evenly with a glass rod, heated and dried in a drying oven (200°C, 2h) to obtain a precursor composite powder containing a tungsten source, a cobalt source, a chromium source, a vanadium source and a carbon source. Finally, the precursor composite powder was microwave sintered under vacuum conditions, and under different reaction temperatures (900-1200 °C) and holding times (1-2.5 h), WC-based composites with an average particle size of less than 100 nm and a uniform particle size distribution were prepared. Compound powder.
Embodiment 3
[0029] Dissolve 45.0% ammonium paratungstate by mass, 10.0% cobalt nitrate, 44.6% starch and water-soluble vanadium / chromium mixed salt (0.2% ammonium metavanadate and 0.2% ammonium dichromate) in deionized water, Prepared as a mixed solution. The mixed solution was stirred evenly with a glass rod, heated and dried in a drying oven (200°C, 2h) to obtain a precursor composite powder containing a tungsten source, a cobalt source, a chromium source, a vanadium source and a carbon source. Finally, the precursor composite powder was placed in a tube furnace and sintered under the protection of an argon atmosphere. The average particle size was obtained at different reaction temperatures (900~1200°C) and holding times (1~2.5h). Less than 200nm, WC-based composite powder with uniform particle size distribution.
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