Dielectric Properties of BaTiO3／Epoxy Composites Prepared Using the Agglomerated BaTiO3 Particles

다국어 초록 (Multilingual Abstract)

BaTiO3/epoxy composites are the major candidate for the dielectric materials applicable to the embedded capacitors in printed circuit boards (PCBs). The dielectric properties of BaTiO3/epoxy composites prepared using the agglomerated BaTiO3 particles are investigated in the resent study. The dielectric constants as well as the polarizations of BaTiO3/epoxy composites prepared using the agglomerated BaTiO3 particles were much higher than those of the composites with the well-dispersed particles. Using the agglomerated BaTiO3 powders heat-treated at 1000oC for 1 hr, BaTiO3/epoxy composite films (~20 m) having dielectric constants μ as high as 66 were obtained in ceramic loading as low as 40 vol%. The enhancement of the
dielectric constants of BaTiO3/epoxy composites prepared using the agglomerated BaTiO3 particles might be attributed to the enhanced parallel arrangement of BaTiO3 particles in epoxy matrix.

목차 (Table of Contents)

• Abstract ---------------------------------------------- ⅰ
• List of Figures ----------------------------------------- ⅳ
• 1. Introduction ------------------------------------------ 1
• 2. Literature Survey ------------------------------------- 3
• 2-1. Embedded passive components ------------------ 3
• 2-2. Properties calculations for two-phase systems ---- 5
• 2-2-1. Region of a single continuous phase --------- 7
• 2-2-2. Region of both continuous phases ----------- 14
• 2-3. Ceramic/polymer composites ------------------- 17
• 3. Experimental --------------------------------------- 27
• 3-1. Materials --------------------------------------- 27
• 3-2. Sample preparation ----------------------------- 28
• 3-3. Characterization -------------------------------- 30
• 3-3-1. Physical properties ------------------------- 30
• 3-3-2. Dielectric properties ------------------------ 30
• 3-3-3. Electrical properties ------------------------ 31
• 3-3-4. Adhesion properties ------------------------ 31
• 4. Results and Discussion ----------------------------- 33
• 4-1. Properties of BaTiO3 powders ------------------- 33
• 4-2. Properties of BaTiO3/epoxy composites --------- 37
• 4-2-1. Microstructures ---------------------------- 37
• 4-2-2. Dielectric properties ------------------------ 42
• 4-2-3. Electrical properties ------------------------ 45
• 4-2-4. Polarization properties ---------------------- 49
• 4-2-5. Peel strength ------------------------------- 53
• 4-2-6. Fitting to predictions ------------------------ 53
• 5. Conclusion ----------------------------------------- 56
• Reference -------------------------------------------- 58