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首页> 外文期刊>Journal of the European Ceramic Society >Synthesis and characterization of nanocrystalline mullite powders at low annealing temperature using a new technique
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Synthesis and characterization of nanocrystalline mullite powders at low annealing temperature using a new technique

机译：低退火温度下纳米晶莫来石粉的合成与表征

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摘要

For the first time orthorhombic mullite nanoparticles (12 nm) have been synthesized via the co-precipitation technique using mixture of sodium aluminate and sodium silicate solutions as monophasic salts at low annealing temperature 1000 deg C. The AC and DC electrical properties of the sintered mullite ceramics were investigated. The results indicated the precursor directly transformed to 3:2 molar ratio orthorhombic mullite. Meanwhile, the surface area of the produced o-mulhte at 1000 °C was 15.1 m~2/g which increased to 37.3 m~2/g with addition of CTAB as a cationic surfactant. TEM images investigated that the microstructure was changed from rod-like shape to roughly spherical shape with addition of surfactant. The DC electrical resistivity of mullite sample sintered at 1600 °C was 16 times greater than that sintered at 1300 deg C. The minimum dielectric loss value of 0.014 was obtained at 1600 °C sintering temperature at 1.5 MHz.
机译：首次通过共沉淀技术使用铝酸钠和硅酸钠溶液的混合物作为单相盐在低退火温度1000摄氏度下合成了正交晶莫来石纳米颗粒（12 nm）。烧结莫来石的交流和直流电性能陶瓷进行了调查。结果表明该前体直接转化为摩尔比为3：2的正交晶莫来石。同时，在1000℃下，所生成的邻苯二甲酸酯的表面积为15.1m 2 / g，通过添加作为阳离子表面活性剂的CTAB，增加至37.3m 2 / g。 TEM图像研究表明，通过添加表面活性剂，微观结构从棒状变为大致球形。在1600°C下烧结的莫来石样品的直流电阻率是在1300℃下烧结的DC电阻率的16倍。在1600°C的烧结温度和1.5 MHz下获得的最小介电损耗值为0.014。

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