Cordierite/ZnO Composites Using ZnO Filler of Various Size for High Thermal Conduction Packages Application
Cordierite (2MgO · 2Al2O3 · 5SiO2) is very good candidate for low temperature co-fired ceramic (LTCC) material but its relatively low thermal conductivity must be enhanced if it is to be applied to light emitting diode (LED). The present study employed glass-ceramic processing for fabrication of cordierite/ZnO composite containing ZnO particles of various sizes to increase the thermal conductivity of cordierite. Thus, the crystallization behavior, physical properties, and nanometer-scale microstructure of cordierite/ZnO composite were investigated as a function of size and amount of ZnO filler. The three types of ZnO filler used were denoted respectively as a fine (330 ± 10 nm), a medium (90~180 μm), and a large (180~300 μm) particles. A pellet-shaped green body was prepared under isostatic pressure and sintered at 962 °C for 3 h to manufacture the cordierite/ZnO composites. The addition of ZnO filler strikingly suppressed the formation of μ-cordierite and promoted the generation of α-cordierite which has better thermal conductivity than that of μ-cordierite. Adding only 5 wt% ZnO filler had 53~73% higher thermal conductivity (κ) than that of pure cordierite. For the composite with fine ZnO filler, a spherical crystal of secondary phase, Zn2SiO4, of 100~200 nm was generated, resulting in decreased thermal conductivity. Meanwhile, many pores formed induced the porous microstructure in the specimen with large-sized ZnO filler. It was thus concluded that the addition of medium-sized ZnO filler to cordierite is a highly effective means of increasing its thermal conductivity by promoting formation of the star-shaped α-cordierite crystals of 300~500 nm, and on this basis the glass-ceramic cordierite/ZnO composites are an excellent candidate for LED packaging materials.
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Document Type: Research Article
Affiliations: Department of Advanced Materials Engineering, Kyonggi University, Suwon 16227, Kyonggi-Do, Republic of Korea
Publication date: June 1, 2017
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