Journal
ADVANCED ENGINEERING MATERIALS
Volume 22, Issue 5, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adem.201901486
Keywords
low-temperature cofired ceramics; nanorod crystals; thermal conductivities
Categories
Funding
- National Key R&D Program of China [2017YFB0406200]
- National Natural Science Foundation of China [21875257]
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With the rapid development of microelectronic information technology, high-power electronic devices require high heat dissipation. Herein, the preparation of low-temperature cofired ceramic (LTCC) applications with excellent thermal conductivity and dielectric properties is focused. B2O3-Bi2O3-SiO2-ZnO (BBSZ) glass/Al2O3/BN green sheets are prepared by tape casting and sintered at 850 degrees C. The crystal phase composition, microstructure, thermal conductivity, thermal expansion coefficient, and dielectric properties of LTCC are investigated. It is shown that nanoscale rod crystals ZnAl2O4 and Bi are formed in the composite. The generated nanoscale rod crystals build a 3D heat conduction channel in the composite. The thermal conductivity of the sintered sheet with 20 wt% BN is 5.165 W m(-1) K-1. The sintered sheet containing 20 wt% BN has a low coefficient of thermal expansion (2.92 ppm degrees C-1) matched well with silicon and excellent dielectric properties (epsilon(r) = 3.9672, tan delta = 1.49 x 10(-3)) at 20 GHz. This material has great potential applications in electronic devices.
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