International Journal of Bio-Science and Bio-Technology
| Volume 9, No. 6, 2017, pp 7-12 | ||
| Abstract |
Study on the Phase formation and Thermal property of ZrO2-CaO-MgO-SiO2 Glass-ceramics System
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Abstract
Diopside is known as a ceramic material with excellent physical and chemical properties. However, it has a disadvantage that when it is applied as an LED packaging material, the heat dissipation of the LED element is not sufficient and the chip and the PCB are easily damaged due to relatively low thermal conductivity of diopside. In this study, the glass-ceramics of ZrO2-CaO-MgO-SiO2 system were prepared by heat-treating the glass which was made of zircon composition (ZrO2-SiO2) powders and diopside composition (CaO-MgO-2SiO2) powders. The suitability of the glass-ceramics of ZrO2-CaO-MgO-SiO2 system as a packaging material for LED was investigated by analyzing changes in the properties such as thermal conductivity, density and shrinkage according to the amount of ZrO2-SiO2 powder added. Within the range of 0 ~ 0.38 mol of amount of ZrO2-SiO2 added, the density and shrinkage fo specimen decreased slightly with increasing the amount of ZrO2-SiO2 added, and then increased again. The thermal conductivity of the specimen was concluded to be closely related to the density. The maximum thermal conductivity of the specimen obtained in this study was 1.728 W/mK, which was about 20% higher than that of pure diopside