论文部分内容阅读
用凝胶预碳化处理工艺的溶胶-凝胶法制备了晶粒粒径小且分散性能较好的钙锶铋钛(Ca0.4Sr0.6Bi4Ti4O15)纳米晶粉体。借助差热-热重分析仪、X射线衍射仪和扫描电镜等分别确定凝胶的预碳化处理温度,研究了预碳化处理工艺对粉体的物相结构、粉体的微观形貌以及分散性能的影响,并分析讨论了预碳化机理。结果表明:在300℃对前驱体凝胶进行预碳化处理增强了粉体的分散性,降低粉体的粒度,提高粉体的均匀性。凝胶预碳化处理工艺并未对粉体的物相结构造成影响。经过预碳化处理制备的粉体的颗粒尺寸集中在100nm左右;未经预碳化处理的粉体的颗粒尺寸为100nm～1μm。凝胶预碳化处理后,高吸附活性的有机碳包覆在前驱体的表面是有效减少粉体团聚的原因。
The nano-crystalline CaCrSbO4 (Ca0.4Sr0.6Bi4Ti4O15) nanocrystalline powders with small grain size and good dispersion properties were prepared by sol-gel method with gel pre-carbonization process. The pre-carbonization temperature of the gel was determined by means of DTA-TGA, X-ray diffraction and scanning electron microscopy. The effects of pre-carbonization process on the phase structure, powder morphology and dispersibility The influence of pre-carbonization was analyzed and discussed. The results show that pre-carbonization of the precursor gel at 300 ℃ enhances the dispersibility of the powder, reduces the particle size and improves the uniformity of the powder. Gel pre-carbonization process did not affect the phase structure of the powder. The particle size of the powder prepared by pre-carbonization treatment is about 100 nm. The particle size of the powder without pre-carbonization is 100 nm-1 μm. Gel pre-carbonization, the high adsorption activity of organic carbon coated on the surface of the precursor is effectively reduce the powder agglomeration reasons.