Mechanical, thermal, and dielectric properties of glass mullite composites for low-temperature cofired ceramic and radome applications
International Journal of Applied Ceramic Technology, cilt.20, sa.5, ss.3287-3296, 2023 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 20 Sayı: 5
- Basım Tarihi: 2023
- Doi Numarası: 10.1111/ijac.14437
- Dergi Adı: International Journal of Applied Ceramic Technology
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Applied Science & Technology Source, Chemical Abstracts Core, Communication Abstracts, Compendex, INSPEC, Metadex, Civil Engineering Abstracts
- Sayfa Sayıları: ss.3287-3296
- Anahtar Kelimeler: dielectric properties, glass-ceramic composites, low-temperature cofired ceramics, mechanical properties, radome, thermal properties
- Ankara Yıldırım Beyazıt Üniversitesi Adresli: Evet
Özet
SiO2-Al2O3-CaO-based glass (10–60 wt%)/mullite composites were investigated for the LTCC and radome applications. The optimum densification temperatures decreased from 1550°C (10 wt% glass) to 1400°C (30 wt% glass) by means of liquid-phase sintering, and to 850°C–825°C (50–60 wt% glass) by means of viscous phase sintering. XRD analysis showed that mullite was the main phase as well as in situ crystallized anorthite after 825°C. The composite with 20 wt% glass was a suitable candidate for the radome applications (bulk density = 2.86 g/cm3 after sintering at 1450°C, dielectric constant (loss) = 7.12 (0.0025) at 5 MHz, thermal expansion coefficient = 4.27 ppm/°C between 25°C and 800°C, thermal shock resistance parameter = 162°C), and the composite with 50 wt% glass was a suitable candidate for the low-temperature cofired ceramic applications (bulk density = 2.64 g/cm3 after sintering at 850°C, dielectric constant (loss) = 6.79 (0.0043) at 5 MHz, thermal conductivity = 2.11 W/m⋅K at 25°C, and thermal expansion coefficient = 3.93 ppm/°C between 25°C and 300°C).