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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing >Low-temperature sintering of BaTiO_3 powders prepared by a hydrothermal process with ball milling system
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Low-temperature sintering of BaTiO_3 powders prepared by a hydrothermal process with ball milling system

机译：球磨系统水热法制备BaTiO_3粉体的低温烧结

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摘要

In this work, a hydrothermal process with ball milling system was developed to produce nanosized BaTiO_3 powders with low-temperature sintering capability. By using this apparatus, it was possible to synthesize nanosized BaTiO_3 powders from Ba(OH)_2 and titanium alkoxides at 100 ℃ after 2 h. The primary particle size was determined to be about 20 nm. Moreover, nanosized BaTiO_3 particles were uniformly agglomerated to about 150 nm. The green bodies prepared from these powders were densified above 95% at 900 ℃, which is fairly lower than the ordinary sintering temperature. The densification was about 60% at 900 ℃ in the green bodies fabricated from powders synthesized by the hydrothermal reaction without ball milling system. The sinterability was found higher for the BaTiO_3 powders synthesized by ball milling-assisted hydrothermal process. The characterization of the synthesized powders and the sintered compacts was carried out by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. For the electrical properties, room temperature dielectric constants as high as 4000 were measured.
机译：在这项工作中，开发了一种球磨系统的水热工艺，以生产具有低温烧结能力的纳米BaTiO_3粉末。通过使用该装置，可以在2 h后于100℃从Ba（OH）_2和钛的醇盐合成纳米尺寸的BaTiO_3粉末。测定的初级粒径为约20nm。而且，纳米级BaTiO_3颗粒均匀地团聚至约150nm。由这些粉末制得的生坯在900℃时被致密化至95％以上，这远低于普通的烧结温度。在没有球磨系统的情况下，由水热反应合成的粉末制成的生坯在900℃下的致密化率为60％左右。球磨辅助水热法合成的BaTiO_3粉体的烧结性较高。通过X射线衍射，扫描电子显微镜和透射电子显微镜对合成粉末和烧结体进行表征。对于电性能，测量的室温介电常数高达4000。

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