TY - JOUR
T1 - Effect of composition on the dielectric properties and thermal conductivity of α-SiAlON ceramics
AU - Guo, Jia
AU - Xu, Jie
AU - Yang, Runwu
AU - Chen, Kan
AU - Yan, Haixue
AU - Gao, Feng
N1 - Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2022/10
Y1 - 2022/10
N2 - In this study, a series of dense Ym/3Si12-(m+n)Alm+nOnN16-n (m = 1.1–1.5, n = 1.0) ceramics were prepared by hot-pressing at 1900 °C for 1 h. The effects of composition on the thermal conductivity, dielectric, and wave-transparent properties of Y-α-SiAlON ceramics were investigated. The X-ray diffraction (XRD) results showed that all ceramic samples exhibited a pure α-SiAlON phase. The dielectric properties of Y-α-SiAlON at 1 kHz–120 MHz and 8.2–12.4 GHz were investigated. The results indicate that a smaller m value leads to weaker ion and interfacial polarisations, resulting in a lower dielectric constant. The three-dimensional relationship between microwave transmittance, frequency, and sample thickness was calculated by simulation, and the results showed that Y0.40Si9.8Al2.2O1.0N15.0 had the best wave-transparent properties. The thermal conductivity of the Y-α-SiAlON ceramics showed a decreasing trend with increasing m value and temperature. The single-phase dense Y0.50Si9.5Al2.5O1.0N15.0 exhibited the minimum thermal conductivity, which was 9.75–5.21 W/m·K (20–1000 °C). Therefore, Y-α-SiAlON ceramics are expected to be promising high-temperature window materials owing to their excellent thermal insulation and wave-transparent properties.
AB - In this study, a series of dense Ym/3Si12-(m+n)Alm+nOnN16-n (m = 1.1–1.5, n = 1.0) ceramics were prepared by hot-pressing at 1900 °C for 1 h. The effects of composition on the thermal conductivity, dielectric, and wave-transparent properties of Y-α-SiAlON ceramics were investigated. The X-ray diffraction (XRD) results showed that all ceramic samples exhibited a pure α-SiAlON phase. The dielectric properties of Y-α-SiAlON at 1 kHz–120 MHz and 8.2–12.4 GHz were investigated. The results indicate that a smaller m value leads to weaker ion and interfacial polarisations, resulting in a lower dielectric constant. The three-dimensional relationship between microwave transmittance, frequency, and sample thickness was calculated by simulation, and the results showed that Y0.40Si9.8Al2.2O1.0N15.0 had the best wave-transparent properties. The thermal conductivity of the Y-α-SiAlON ceramics showed a decreasing trend with increasing m value and temperature. The single-phase dense Y0.50Si9.5Al2.5O1.0N15.0 exhibited the minimum thermal conductivity, which was 9.75–5.21 W/m·K (20–1000 °C). Therefore, Y-α-SiAlON ceramics are expected to be promising high-temperature window materials owing to their excellent thermal insulation and wave-transparent properties.
UR - http://www.scopus.com/inward/record.url?scp=85138111524&partnerID=8YFLogxK
U2 - 10.1007/s10854-022-09026-7
DO - 10.1007/s10854-022-09026-7
M3 - 文章
AN - SCOPUS:85138111524
SN - 0957-4522
VL - 33
SP - 22480
EP - 22491
JO - Journal of Materials Science: Materials in Electronics
JF - Journal of Materials Science: Materials in Electronics
IS - 28
ER -