Method for preparing nano tungsten-copper-rare earth composite powder
A technology of copper rare earth and composite powder is applied in the field of preparation of nanometer tungsten copper rare earth composite powder, which can solve the problems of complex steps of nanometer tungsten copper composite powder, reducing the electrical conductivity and thermal conductivity of materials, and long time of decomposition and reduction process, so as to avoid The effect of copper concentration gradient, compactness and comprehensive performance improvement of materials, inhibiting grain growth
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Embodiment 1
[0022] 1) Weigh 630g Cu(NO 3 ) 2 ·3H 2 O, 356g ammonium metatungstate dissolved in 1830g H 2 In O, a mixed solution with a concentration of about 30% is prepared;
[0023] 2) Add a nitric acid solution with a concentration of 50% to adjust the pH value of the above solution to 3;
[0024] 3) Add 2g of yttrium nitrate and stir evenly to obtain a higher saturation solution or near colloid;
[0025] 4) The solution or sol pressure spray dryer is spray-dried, the inlet air temperature of the spray drying is 200°C ~ 250°C, the outlet air temperature is 180°C ~ 200°C, and the feed flow rate is 300ml / min to obtain the precursor powder;
[0026] 5) The precursor powder is calcined in a high-temperature rapid decomposition furnace, which uses a fluidized bed to fluidize the precursor solid powder and transport it through a heat-resistant pipeline. A heating device is installed outside the pipeline to calcin the precursor powder Then enter a receiving device, the calcination temperature is 800 ...
Embodiment 2
[0029] 1) Weigh 236g Cu(NO 3 ) 2 ·3H 2 O, 356g ammonium metatungstate dissolved in 755g H 2 In O, prepare a mixed solution with a concentration of about 40%;
[0030] 2) Add a 50% hydrochloric acid solution to adjust the pH of the above solution to 4;
[0031] 3) Add 3g of cerium nitrate and stir evenly to obtain a higher saturation solution or near colloid;
[0032] 4) Spray drying the solution or sol. The inlet air temperature of the spray drying is 200°C ~ 250°C, the outlet air temperature is 180°C ~ 200°C, and the feed flow rate is 200ml / min to obtain the precursor powder;
[0033] 5) The precursor powder is calcined in a high-temperature rapid decomposition furnace, the calcining temperature is 1100°C, and the calcining time is 7 minutes to obtain nano-scale tungsten copper rare earth oxide composite powder;
[0034] 6) Reduce the tungsten-copper rare-earth oxide composite powder in a reduction device with "hydrogen + nitrogen" at 750°C for 50 minutes to obtain a copper-containing ...
Embodiment 3
[0036] 1) Weigh 630g Cu(NO 3 ) 2 ·3H 2 O, 60g ammonium metatungstate dissolved in 2055g H 2 In O, prepare a mixed solution with a concentration of about 20%;
[0037] 2) Adding a 50% concentration of nitric acid + hydrochloric acid mixed solution to adjust the pH value of the above solution to 5;
[0038] 3) Add 1g of gadolinium nitrate and stir evenly to obtain a solution or near colloid with higher saturation;
[0039] 4) Spray drying the solution or sol. The inlet air temperature of spray drying is 250℃~300℃, the outlet temperature is 180℃~200℃, and the feed flow rate is 400ml / min to obtain the precursor powder;
[0040] 5) Calcining the precursor powder in a high-temperature rapid decomposition furnace at a calcination temperature of 1200°C and a calcination time of 5 minutes to obtain nano-scale tungsten copper rare earth oxide composite powder;
[0041] 6) The tungsten copper rare earth oxide composite powder is reduced with pure hydrogen at 900° C. for 30 min in a reduction devic...
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