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Method for quickly sintering fine-grain barium titanate capacitor ceramic at low temperature under assistance of electric field
The invention discloses a method for quickly sintering fine-grain barium titanate capacitor ceramic at low temperature under the assistance of an electric field. The method is used for quickly sintering fine-grain barium titanate at lower temperature. The method comprises the following steps: mixing materials according to a certain ratio, and performing compression molding; putting a blank into a device, increasing the temperature at a constant heating rate, applying an auxiliary electric field, and setting a critical value for the current; and when the temperature reaches 900-950 DEG C, entering a stable stage, and keeping the current at a critical value for a period of time; and then closing the equipment for applying the electric field, and rapidly cooling the furnace until the room temperature is reached. Under the induction of the electric field, the mass transfer speed of particles in a sample is increased, and the sample is rapidly shrunk and densified at the moment; and meanwhile, a large amount of heat can be generated in a very short time, so that the sintering temperature is low and is far lower than the pressureless sintering temperature. According to the method, the furnace temperature required by sintering and cost can be greatly reduced, the sintering speed is increased, and the energy consumption is reduced. The invention provides a novel process method for producing capacitor ceramics with excellent dielectric properties.
本发明公开了一种电场辅助低温快速烧结细晶钛酸钡电容器陶瓷的方法，在较低的温度下，快速烧结出细晶钛酸钡。本发明配比混好料后，压制成型；把坯料放入装置中，温度以恒升温速率上升，施加辅助电场，电流设置一个临界值；在温度到达900～950℃时，进入稳定阶段，此时电流保持在临界值一段时间。然后关闭施加电场的设备，炉子开始快速降温，直至室温。本发明在电场的诱导下，样品中颗粒的传质速度加快，此时样品会快速收缩，致密化；同时由于在很短的时间内会产生大量的热量，烧结温度低，远远小于无压烧结的温度。本发明方法能大大降低烧结时所需的炉温及成本，烧结速度加快，能耗减少。它为生产介电性能优异的电容器陶瓷提供了新型的工艺方法。
Method for quickly sintering fine-grain barium titanate capacitor ceramic at low temperature under assistance of electric field
The invention discloses a method for quickly sintering fine-grain barium titanate capacitor ceramic at low temperature under the assistance of an electric field. The method is used for quickly sintering fine-grain barium titanate at lower temperature. The method comprises the following steps: mixing materials according to a certain ratio, and performing compression molding; putting a blank into a device, increasing the temperature at a constant heating rate, applying an auxiliary electric field, and setting a critical value for the current; and when the temperature reaches 900-950 DEG C, entering a stable stage, and keeping the current at a critical value for a period of time; and then closing the equipment for applying the electric field, and rapidly cooling the furnace until the room temperature is reached. Under the induction of the electric field, the mass transfer speed of particles in a sample is increased, and the sample is rapidly shrunk and densified at the moment; and meanwhile, a large amount of heat can be generated in a very short time, so that the sintering temperature is low and is far lower than the pressureless sintering temperature. According to the method, the furnace temperature required by sintering and cost can be greatly reduced, the sintering speed is increased, and the energy consumption is reduced. The invention provides a novel process method for producing capacitor ceramics with excellent dielectric properties.
本发明公开了一种电场辅助低温快速烧结细晶钛酸钡电容器陶瓷的方法，在较低的温度下，快速烧结出细晶钛酸钡。本发明配比混好料后，压制成型；把坯料放入装置中，温度以恒升温速率上升，施加辅助电场，电流设置一个临界值；在温度到达900～950℃时，进入稳定阶段，此时电流保持在临界值一段时间。然后关闭施加电场的设备，炉子开始快速降温，直至室温。本发明在电场的诱导下，样品中颗粒的传质速度加快，此时样品会快速收缩，致密化；同时由于在很短的时间内会产生大量的热量，烧结温度低，远远小于无压烧结的温度。本发明方法能大大降低烧结时所需的炉温及成本，烧结速度加快，能耗减少。它为生产介电性能优异的电容器陶瓷提供了新型的工艺方法。
Method for quickly sintering fine-grain barium titanate capacitor ceramic at low temperature under assistance of electric field
电场辅助低温快速烧结细晶钛酸钡电容器陶瓷制备方法
XING JUANJUAN (author) / CHEN LONG (author) / JIANG YING (author) / GU HUI (author) / JIANG ZUOJIAN (author) / FU QINGQIAO (author)
2021-06-08
Patent
Electronic Resource
Chinese
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