Nanocrystalline barium titanate dielectric ceramic, preparation method thereof and ceramic capacitor: Fid-Bau Portal

Nanocrystalline barium titanate dielectric ceramic, preparation method thereof and ceramic capacitor

LI LINGXIA / HUANG KEWEN / DU MINGKUN / XUE KEYING

The invention provides nanocrystalline barium titanate dielectric ceramic, a preparation method thereof and a ceramic capacitor, and belongs to the technical field of ceramic materials. The preparation method of the nanocrystalline barium titanate dielectric ceramic comprises the following steps: adding barium titanate into a first solvent, and carrying out ultrasonic atomization to obtain barium titanate slurry; adding holmium nitrate, yttrium nitrate, dysprosium nitrate, calcium nitrate, magnesium nitrate, manganese acetate and zinc acetate into an inorganic solvent to obtain an inorganic doped solution, and adding tetraethoxysilane into a second solvent to obtain an organic doped solution; uniformly mixing the barium titanate slurry, the inorganic doping solution and the organic doping solution to obtain mixed slurry; adjusting the pH value of the mixed slurry to be alkaline, standing and precipitating, drying, sieving for the first time, and pre-sintering to obtain powder; sieving the powder for the second time, uniformly mixing the powder with a binder, sieving for the third time, granulating, and carrying out compression molding to obtain a green body; and degumming and sintering the green body to obtain the nanocrystalline barium titanate dielectric ceramic.

本发明提供了一种纳米晶钛酸钡介质陶瓷及其制备方法和陶瓷电容器，属于陶瓷材料技术领域。该纳米晶钛酸钡介质陶瓷的制备方法包括：将钛酸钡加入至第一溶剂中经超声雾化，得到钛酸钡浆料；将硝酸钬、硝酸钇、硝酸镝、硝酸钙、硝酸镁、乙酸锰、乙酸锌加入至无机溶剂中，得到无机掺杂溶液，将四乙氧基硅加入至第二溶剂中，得到有机掺杂溶液；将钛酸钡浆料、无机掺杂溶液和有机掺杂溶液混合均匀，得到混合浆料；将混合浆料的pH调节至碱性并静置沉淀，烘干后经第一次过筛、预烧，得到粉料；粉料经第二次过筛后，再与粘结剂混合均匀，经第三次过筛后进行造粒，压制成型得到生胚；生胚经排胶、烧结后，得到纳米晶钛酸钡介质陶瓷。

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