段維新臺灣大學:材料科學與工程學系暨研究所呂承翰Lu, Cheng-HanCheng-HanLu2010-07-142018-06-282010-07-142018-06-282008U0001-1706200813332000http://ntur.lib.ntu.edu.tw//handle/246246/189004The co-firing behaviour of Ni-Cu-Zn ferrite, LTCC, and Ag has been investigated in the present study. Various amounts of ferrite, LTCC, and Ag powders are mixed and sintered at different temperatures. The interactions between these materials are observed. Laminated specimens composing of ferrite, LTCC, and Ag layers are also prepared by sintering in air or N2. The magnetic properties of the samples are measured by superconducting quantum interference device magnetometer (SQUID) and impedance analyzer. X-ray diffraction is used for the phase identification. The material distribution is investigated by electron probe X-Ray micro-analyzer (EPMA). The addition of bismuth oxide enhances the densification and the grain growth of ferrite. An addition of 0.4 wt% bismuth oxide in ferrite leads to a high permeability. The change of Fe2+ to Fe3+ in ferrite is intrigued by the presence of LTCC and further promoted by the addition of silver. Such oxidation is also enhanced with the increase of the sintering temperature. The oxidation of ferrite and the presence of the α-Fe2O3 seriously degrade the saturation magnetization. A new glass phase is formed during the cofiring of ferrite, LTCC, and silver in air. This glassy phase flows at elevated temperature and affects the diffusion of the material in the samples. When the samples are sintered in N2, copper and silver form a solid solution, which also becomes a liquid phase at high temperature. The Ag-Cu liquid flows toward the ferrite layer and results in the dispersion of silver particles within ferrite in the laminated specimens.Chapter 1 Introduction 1hapter 2 Literature Survey 3-1 Ferrimagnetism 3-2 Spinel Structure and Cation Distribution in Ferrite 8-3 Low Temperature Co-fired Ceramics (LTCC) 19-4 Previous researches about co-firing of ferrite and LTCC 23hapter 3 Experimental Procedures 27-1 Sintering of Ferrite 27-1-1 Materials and the Sintering Conditions 27-1-2 Density and Microstructure Analysis 27-1-2-1 Density Measurement 27-1-2-2 Phase Identification and Grain Size Distribution 28-1-3 Magnetic Properties Measurement 29-2 Co-firing of Ferrite and Silver 29-2-1 Materials and the sintering condition 29-2-2 Density and Microstructure Analysis 30-2-3 Magnetic Properties Measurement 30-3 Co-firing of Ferrite, LTCC, and Silver 30-3-1 Materials and Sintering Conditions 30-3-2 Density and Microstructure Analysis 31-3-2-1 Density Measurement 31-3-2-2 Microstructure and Phase Analysis 31-3-3 Magnetic Properties Measurement 32-4 Co-firing of Ferrite/LTCC/Silver Laminates 32-4-1 Materials and Sintering Conditions 32-4-2 Microstructure Analysis 33hapter 4 Results 39-1 Sintering of Ferrite 39-1-1 Microstructure 39-1-2 Density and Grain Size Distribution 39-1-3 Phase Identification 41-1-4 Magnetic Properties 41-2 Co-firing of Ferrite and Silver 53-2-1 Microstructure 53-2-2 Density and Grain Size Distribution 54-2-3 Phase Identification 55-2-4 Magnetic Properties 55-3 Co-firing of Ferrite, LTCC, and Silver 61-3-1 Density and Microstructure 61-3-2 Phase Identification 62-3-3 Magnetic Properties 66-4 Co-firing of Ferrite/LTCC/Silver Laminates 76-4-1 Samples Sintered in Air 76-4-1-1 Microstructure 76-4-1-2 Material Distribution 78-4-2 Samples Sintered in N2 94-4-2-1 Microstructure 94-4-2-2 Material Distribution 95hapter 5 Discussions 109-1 Effect of Additives 109-2 Effect of LTCC 112-3 Material Diffusion 113-3-1 Silver Diffusion 113-3-2 Diffusion of other materials 117-4 Sintering Atmosphere 122hapter 6 Conclusions 127eferences 12925309722 bytesapplication/pdfen-USNi-Cu-Zn ferrite低溫共燒陶瓷磁導率飽和磁化量銀擴散LTCCcofiringsilverdiffusionpermeabilitysaturation magnetizationthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/189004/1/ntu-97-R95527001-1.pdf