Effects of Al2O3、TiO2 and ZrO2 additions on microstructures and properties in a low temperature co-fired CaO-Al2O3-B2O3-SiO2 glass
| Autor: | Wong,Pei-Ying, 翁沛穎 |
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| Rok vydání: | 2016 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 104 Al2O3, TiO2 and ZrO2 ceramics added in a CaO-Al2O3-B2O3-SiO2 glass system are explored as microwave dielectric materials for the development of low temperature co-fired ceramics (LTCC). A glass frit was synthetized by mixing oxides of the CaO, Al2O3, B2O3, and SiO2 melted at 900°C and then quenched. The grinded glass frits are mixed with 0~30 wt% of Al2O3, TiO2 and ZrO2 ceramic powders. The mixed powders pressed into disks and then sintered at 900°C for 0.5 hr. The microstructural features, microwave dielectric properties, bending strength, density, and coefficient of thermal conductivity are studied. Experimental results show the coexistence of amorphous glasses and crystallization ceramic-fillers. There are no extra second phases in the matrix. The 8-12 wt% additions of Al2O3, TiO2 and ZrO2 display higher densification and lower porosity, which attributed to superior wettability of interface between glass and ceramic-filler due to liquid phase sintering of glass. Moreover, these compositions also exhibit higher bending strength and coefficient of thermal conductivity. The glass added different contents of Al2O3, TiO2 and ZrO2 fillers display a linear increase of dielectric permittivity at a 2.45GHz frequency of measurement. The CaO-Al2O3-B2O3-SiO2 glass with 8-12 wt% additions of Al2O3, TiO2 and ZrO2 can be suggested as a low temperature co-fired microwave dielectric material. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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