Method for preparing vanadium nitride and device
A technology for industrial microwave ovens and heating equipment, which is applied in lighting and heating equipment, electric heating fuel, nitrogen-metal/silicon/boron binary compounds, etc., and can solve problems such as the lack of precedents for industrial microwave ovens
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Embodiment 1
[0007] 900kg of 90% V with a purity of 98.56% has been ground into 120 mesh 2 o 5 Powder, 332kg of graphite powder and 125kg of 1% carboxymethylcellulose aqueous solution are mixed and pressed into pieces of φ80×30mm. Then put the block into the crucible 5, and automatically push it into the microwave oven by the control system. After the furnace door is closed and sealed, the vacuum system starts to start and pump air. When the vacuum reaches 40 Pa, start heating, pre-reduce at 650°C for 1 hour, and then carbonize at 1400°C for 2 hours. After the carbonization is finished, stop pumping, let in nitrogen, and nitriding at 1000°C for 2 hours. After the heating is over, the product is automatically released when it is naturally cooled to 180°C in the furnace, and the apparent density of 617kg is 3810g / cm 3 , containing V78.32%, N12.22%, C6.41%, O1.55% vanadium nitride.
Embodiment 2
[0009] 700kg of 90% V with a purity of 98.32% has been ground into 120 mesh 2 o 5 Powder, 250kg of graphite powder and 88kg of 1% carboxymethyl cellulose aqueous solution are mixed and pressed into pieces of φ80×30mm. Then put the block into the crucible 5, and automatically push it into the microwave oven by the control system. After the furnace door is closed and sealed, the vacuum system starts to start and pump air. When the vacuum reaches 100 Pa, start heating, pre-reduce at 600°C for 0.5 hours, and then carbonize at 1300°C for 1.5 hours. After the carbonization is completed, stop pumping, feed nitrogen, and nitriding at 1100°C for 2.5 hours. After heating, the product is automatically released when it is naturally cooled to 170°C in the furnace, and the apparent density of 486kg is 3570g / cm 3 , containing V77.89%, N9.05%, C8.15%, O3.25% vanadium nitride.
Embodiment 3
[0011] 1000kg of 80% V with a purity of 98.17% has been ground into 200 mesh 2 o 5 Powder, 333kg of graphite powder and 130kg of 1% carboxymethyl cellulose aqueous solution are mixed and pressed into pieces of φ80×30mm. Then put the block into the crucible 5, and automatically push it into the microwave oven by the control system. After the furnace door is closed and sealed, the vacuum system starts to start and pump air. When the vacuum reaches 30 Pa, start heating, pre-reduce at 680°C for 1 hour, and then carbonize at 1450°C for 2 hours. After the carbonization is completed, stop pumping, feed nitrogen, and nitriding at 1200°C for 3.5 hours. After the heating is over, the product is automatically released when it is naturally cooled to 150°C in the furnace, and the apparent density of 682kg is 4170g / cm 3 , containing V79.28%, N13.34%, C5.07%, O0.81% vanadium nitride.
[0012] The above-mentioned vanadium nitride product obtained by using the equipment of the present inv...
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