| Home | E-Submission | Sitemap | Login | Contact Us |  
top_img
J. Korean Ceram. Soc. > Volume 59(3); 2022 > Article
Journal of the Korean Ceramic Society 2022;59(3): 383-392.
doi: https://doi.org/10.1007/s43207-021-00185-7
Processing and properties of nano‑hBN‑added glass/ceramic composites for low‑temperature co‑fired ceramic applications
Oğuzhan Bilaç, Gülsüm Meryem Dursun, Cihangir Duran
Metallurgical and Materials Engineering Department, Ankara Yıldırım Beyazıt University, Etlik, Ankara 06010, Turkey
Correspondence  Cihangir Duran ,Email: cduran@ybu.edu.tr
Received: September 24, 2021; Revised: December 13, 2021   Accepted: December 29, 2021.  Published online: May 31, 2022.
ABSTRACT
LTCC applications require densification at temperatures lower than 950 °C to allow co-firing with metal electrodes, lower dielectric constant to increase signal transmission speed, a thermal expansion coefficient matched to Si for reliability and higher thermal conductivity to dissipate heat. For this purpose, ( SiO2–Al2O3–CaO)-based glass (50–60 wt%)/ceramic ( Al2O3 or mullite) composites with nano-hBN (0–10 wt%) addition were investigated. Al2O3 was replaced by mullite to decrease dielectric constant and to match thermal expansion coefficient to Si, and hBN was incorporated to increase thermal conductivity and to decrease dielectric constant. Densification at temperatures ≤ 900 °C was easily achieved for all compositions due to viscous sintering of the glass matrix. hBN did not react chemically with crystalline and amorphous phases, which effectively decreased dielectric constant and increased thermal conductivity. Hence, both mullite and nano-hBN strongly improved dielectric and thermal properties required for the LTCC applications. Dense mullite/glass (55 wt%) base composite with 10 wt% hBN addition was successfully engineered and had comparable dielectric and thermal properties (i.e., 2.3 gcm−3 after sintering at 900 °C, dielectric constant (loss) = 5.13 (0.003) at 5 MHz, thermal conductivity = 1.91 Wm−1 K−1 at 25 °C, and thermal expansion coefficient for the base composite = 4.75 ppm°C-1) with respect to the commercial LTCC products.
Key words: Glass/ceramic composites · Hexagonal boron nitride · Low-temperature co-fired ceramics · Dielectric properties · Thermal properties
Editorial Office
Meorijae Bldg., Suite # 403, 76, Bangbae-ro, Seocho-gu, Seoul 06704, Korea
TEL: +82-2-584-0185   FAX: +82-2-586-4582   E-mail: ceramic@kcers.or.kr
About |  Browse Articles |  Current Issue |  For Authors and Reviewers
Copyright © The Korean Ceramic Society.                      Developed in M2PI