Method for preparing fully-stabilized tetragonal-phase zirconia crystal fibers
A technology of crystalline fiber and phase zirconia, applied in the field of refractory materials and heat preservation, can solve the problems of low fiber strength, low zirconia content, and difficult densification of zirconia fibers, and achieves the effect of simple process and short production cycle.
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Embodiment 1
[0020] Pour 30g of zirconium hydroxide powder into 90g of water and stir to form a suspension. Then mix 5.7g of yttrium nitrate and 48g of 50% nitric acid solution, stir well to make it evenly mixed, and then slowly add this mixture into the zirconium hydroxide aqueous solution under the stirring condition of 25°C, and keep stirring for 2.5h after the addition is completed , concentrated at 78°C until the viscosity reached 20 Pa.s, and finally aged to 80 Pa.s at 10°C to obtain a spinnable precursor sol. The spinnable precursor sol is passed through high-speed centrifugal spinning equipment to obtain zirconium-containing gel fibers. The zirconium-containing gel fibers are heated in a shuttle high-temperature kiln, and the temperature is raised to 500°C at a rate of 1.5°C / min. After 1 hour, the temperature was raised to 1100°C at a rate of 5°C / min, and then kept at a constant temperature for 1 hour, then rapidly cooled to room temperature to obtain zirconia crystal fibers. The ...
Embodiment 2
[0022] Pour 30g of zirconium hydroxide powder into 90g of water and stir to form a suspension. Then mix 7.8g of yttrium nitrate and 48g of 50% concentration nitric acid solution, stir fully to make it evenly mixed, then slowly add this mixed solution into the zirconium hydroxide aqueous solution at 26°C under stirring conditions, and continue stirring for 2.2h after the slow addition , concentrated at 75°C until the viscosity reached 21Pa.s, and finally aged to 85Pa.s at 10°C to obtain a spinnable precursor sol. The spinnable precursor sol is passed through high-speed centrifugal spinning equipment to obtain zirconium-containing gel fibers. The zirconium-containing gel fibers are heated in a shuttle high-temperature kiln, and the temperature is raised to 500°C at a rate of 1.6°C / min. 1h, then the temperature was raised to 1100°C at a rate of 6°C / min, kept at a constant temperature for 1h, and rapidly cooled to room temperature to obtain zirconia crystal fibers. The crystal fo...
Embodiment 3
[0024] Pour 30g of zirconium hydroxide powder into 90g of water and stir to form a suspension. Mix 5.7g of yttrium nitrate and 96g of 50% nitric acid solution, stir well to make it evenly mixed, then slowly add the mixed solution into the zirconium hydroxide aqueous solution at 27°C under stirring conditions, and continue stirring for 2.4h after the slow addition is completed. Concentrate at 76°C until the viscosity reaches 22 Pa.s, and finally age at 10°C to 90 Pa.s to obtain a spinnable precursor sol. The spinnable precursor sol is passed through high-speed centrifugal spinning equipment to obtain zirconium-containing gel fibers. The zirconium-containing gel fibers are heated in a shuttle high-temperature kiln, and the temperature is raised to 500°C at a rate of 1.7°C / min. After 1 hour, the temperature was raised to 1100°C at a rate of 7°C / min, and then kept at a constant temperature for 1 hour, and then rapidly cooled to room temperature to obtain zirconia crystal fibers. ...
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