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Method for preparing high-tetragonality barium titanate powder
The invention relates to the field of dielectric materials of MLCC (multilayer ceramic capacitor), and in particular, relates to a preparation method of high-tetragonality barium titanate powder with a 'core-shell' structure. A two-step method is adopted for preparation; the method comprises the steps: step 1, adopting a hydrothermal method for preparation, serving a titanium source as a seed of the whole hydrothermal reaction in the hydrothermal process and stirring and mixing with a first barium source, and to obtain powder of the 'core-shell' structure with the titanium source as a core and cubic phase barium titanate as a shell layer; and step 2, preparing by adopting a solid phase method, drying the powder prepared by adopting the hydrothermal method, uniformly mixing with a second barium source by ball milling, drying the product after ball milling and mixing, and calcining to obtain the barium titanate powder. The barium titanate powder prepared by the method combines the advantages of low calcination temperature and small particle size of barium titanate powder prepared by a normal-pressure hydrothermal method and the advantage of high tetragonality of barium titanate powder synthesized by a solid-phase method, integrates the advantages and disadvantages of the hydrothermal method and the solid-phase method, has no pollution in the whole preparation process, and can achieve the purpose of controllable particle size by selecting different particle sizes of raw materials.
本发明涉及MLCC陶瓷电容器电介质材料领域，具体涉及高四方性“芯‑壳”结构的钛酸钡粉体的制备方法。采用二步法制备；第一步采用水热法制备，将钛源在水热过程中作为整个水热反应的种子与第一钡源搅拌混合，得到了以钛源为核，以立方相钛酸钡为壳层的“芯‑壳”结构的粉体；第二步采用固相法制备，将采用水热法制备得到的粉体干燥后与第二钡源球磨混合均匀，将球磨混合后的产物干燥然后进行煅烧得到钛酸钡粉体。本发明制备的钛酸钡粉体结合了常压水热法制备钛酸钡粉体的低煅烧温度，小粒径的优点与固相法合成高四方性的优点，综合了水热法与固相法的优缺点，整个制备过程无污染，且通过选择原料不同的粒径尺寸，可达到粒径可控的目的。
Method for preparing high-tetragonality barium titanate powder
The invention relates to the field of dielectric materials of MLCC (multilayer ceramic capacitor), and in particular, relates to a preparation method of high-tetragonality barium titanate powder with a 'core-shell' structure. A two-step method is adopted for preparation; the method comprises the steps: step 1, adopting a hydrothermal method for preparation, serving a titanium source as a seed of the whole hydrothermal reaction in the hydrothermal process and stirring and mixing with a first barium source, and to obtain powder of the 'core-shell' structure with the titanium source as a core and cubic phase barium titanate as a shell layer; and step 2, preparing by adopting a solid phase method, drying the powder prepared by adopting the hydrothermal method, uniformly mixing with a second barium source by ball milling, drying the product after ball milling and mixing, and calcining to obtain the barium titanate powder. The barium titanate powder prepared by the method combines the advantages of low calcination temperature and small particle size of barium titanate powder prepared by a normal-pressure hydrothermal method and the advantage of high tetragonality of barium titanate powder synthesized by a solid-phase method, integrates the advantages and disadvantages of the hydrothermal method and the solid-phase method, has no pollution in the whole preparation process, and can achieve the purpose of controllable particle size by selecting different particle sizes of raw materials.
本发明涉及MLCC陶瓷电容器电介质材料领域，具体涉及高四方性“芯‑壳”结构的钛酸钡粉体的制备方法。采用二步法制备；第一步采用水热法制备，将钛源在水热过程中作为整个水热反应的种子与第一钡源搅拌混合，得到了以钛源为核，以立方相钛酸钡为壳层的“芯‑壳”结构的粉体；第二步采用固相法制备，将采用水热法制备得到的粉体干燥后与第二钡源球磨混合均匀，将球磨混合后的产物干燥然后进行煅烧得到钛酸钡粉体。本发明制备的钛酸钡粉体结合了常压水热法制备钛酸钡粉体的低煅烧温度，小粒径的优点与固相法合成高四方性的优点，综合了水热法与固相法的优缺点，整个制备过程无污染，且通过选择原料不同的粒径尺寸，可达到粒径可控的目的。
Method for preparing high-tetragonality barium titanate powder
一种制备高四方性钛酸钡粉体的方法
ZHANG LEI (author) / HE YANMEI (author) / YU SHUHUI (author) / SUN RONG (author) / CAO XIUHUA (author) / FU ZHENXIAO (author) / REN HAIDONG (author)
2021-08-24
Patent
Electronic Resource
Chinese
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