| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 98 === Demands are high in recent years for the thin dielectric layer of multi-layer ceramic capacitor (MLCC) for development of miniaturization. To achieve high capacitance values, the thickness of the dielectric layer in MLCC should the decreased are the number of the MLCC intermediate layer need to increased.
In this investigation, influences of the high energy bead milling on physical properties of BaTiO3 powder are studied. The experiment instrument was a new type of bead miller. One of the experimental variables was the milling time, while two different commercial powders used were barium titanate powders (BaTiO3) with dielectric ceramic additive powders. In order to discuss the effects of beads milling time, physical, sintering and dialect properties of milled powders are investigated.
In the present study, bead milling time was selected as a process parameter to affect the powder properties. After milling for different times, the powders were characterized in terms of size distribution and c/a ratio and the microstructure and dielectric property of sintered samples, aiming at understanding the relationship between bead milling condition and the powder characterized.
The results show that barium titanate powder of particle size and the c / a ratio decrease and the powder size distribution is shifted and become narrow when the specific milling energy and time increase. After sintering, the results reveal the dielectric properties changes with the sample microstructure.
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