CAJ | 학술논문

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～1 μm.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.
용응효예탄화처리공예적용효-응효법제비료정립립경소차분산성능교호적개송필태(Ca0.4Sr0.6Bi4Ti4O15)납미정분체.차조차열-열중분석의、X사선연사의화소묘전경등분별학정응효적예탄화처리온도,연구료예탄화처리공예대분체적물상결구、분체적미관형모이급분산성능적영향,병분석토론료예탄화궤리.결과표명:재300℃대전구체응효진행예탄화처리증강료분체적분산성,강저분체적립도,제고분체적균균성.응효예탄화처리공예병미대분체적물상결구조성영향.경과예탄화처리제비적분체적과립척촌집중재100nm좌우;미경예탄화처리적분체적과립척촌위100nm～1 μm.응효예탄화처리후,고흡부활성적유궤탄포복재전구체적표면시유효감소분체단취적원인.
Calcium strontium bismuth titanium(Ca0.4Sr0.6BirTi4O15)nanocrystalline powder with small particle size and good dispersion was prepared via the gel pre-carbonization sol-gel method.The temperature for gel pre-carbonization was determined by differential scanning calorimetry-thermal gravimetric analysis.The effects of pre-carbonization of gel on the properties such as the phase structure,microstructure and dispersion of the Ca0.4Sr0.6BirTi4O15 nanocrystalline powder were studied by X-ray diffraction and scanning electron microscope,respectively,and the pre-carbonization mechanism was also analyzed.Experimental results show that,after gel pre-carbonization at 300℃,the dispersion of the Ca0.4Sr0.6Bi4Ti4O15 nanocrystalline powder improved,the particle size decreased,and the homogeneity of the powder improved.The phase structure was not influenced.The particle size with gel pre-carbonization was about 100nm;however,the particle size without gel pre-earbonization was inthe range of 100nm-1 μm.The mechanism is that,after the pre-carbonizing treatment,the precursor powder is modified and coated with carbon powder,which reduces grain agglomeration effectively.