Synthesis and thermal properties of dense Si─Al─C─N-based polymer-derived ceramics
Abstract
In the present study, aluminum‐modified preceramic silicon polymers were synthesized via chemical modification of a commercially available organopolysilazane using an aluminum amido complex. The incorporation of aluminum into the polymer structure and its effect on ceramization behavior and processability as well as the thermal and mechanical properties of the obtained Si─Al─C─N ceramic materials were systematically investigated. The microstructure and chemical composition of the dense, predominantly amorphous monolithic Si─Al─C─N were characterized using solid‐state nuclear magnetic resonance, scanning electron microscopy, and transmission electron microscopy. Aluminum incorporation led to enhanced densification of Si─C─N, resulting in monoliths with a porosity fraction as low as 2 vol% achieved for the composition with the highest aluminum content. Al incorporation was shown to also result in a significant reduction in thermal conductivity, thus, Si─Al─C─N formulations exhibited values as low as 0.6 W m −1 K −1 . The hardness and Young's modulus remained nearly unchanged upon aluminum incorporation, with values of ca. 14.5 and 156 GPa, respectively, for the high‐aluminum‐content sample. To the best of our knowledge, the present study reports for the first time on the thermal and mechanical properties of dense, mainly amorphous Si─Al─C─N ceramics, highlighting the suitability of Si─Al─C─N as excellent material for possible thermal insulation at temperatures beyond 1000°C.
Related
- Effect of pyrolysis temperature on the microstructure and thermal conductivity of polymer-derived monolithic and porous SiC ceramics
- Synthesis and characterization of luminescent properties of ceramics derived from polysilylcarbodiimides
- Synthesis of polymer-derived graphene/silicon nitride-based nanocomposites with tunable dielectric properties
- Polymer‐Derived Ceramics: A Materials Platform for Advanced Energy and Environmental Applications
- Modeling Phase Separation in Polymer-Derived Silicon Carbonitride Ceramics through Extended Machine Learning Molecular Dynamics
BibTeX
@article{boroojerdi2026synthesis,
title = {{Synthesis and thermal properties of dense Si─Al─C─N-based polymer-derived ceramics}},
author = {Minoo Boroojerdi and Daniela Camacho and Hergen Breitzke and Ingrit Nurak and Marc Widenmeyer and Wenjie Xie and Astrid Pundt and Gerd Buntkowsky and Ralf Riedel and Emanuel Ionescu},
journal = {International Journal of Applied Ceramic Technology},
year = {2026},
month = oct,
doi = {10.1111/ijac.70119},
url = {https://hal.science/hal-05789810v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Synthesis and thermal properties of dense Si─Al─C─N-based polymer-derived ceramics
AU - Minoo Boroojerdi
AU - Daniela Camacho
AU - Hergen Breitzke
AU - Ingrit Nurak
AU - Marc Widenmeyer
AU - Wenjie Xie
AU - Astrid Pundt
AU - Gerd Buntkowsky
AU - Ralf Riedel
AU - Emanuel Ionescu
PY - 2026
DA - 2026/10/09
JO - International Journal of Applied Ceramic Technology
DO - 10.1111/ijac.70119
UR - https://hal.science/hal-05789810v1
AB - In the present study, aluminum‐modified preceramic silicon polymers were synthesized via chemical modification of a commercially available organopolysilazane using an aluminum amido complex. The incorporation of aluminum into the polymer structure and its effect on ceramization behavior and processability as well as the thermal and mechanical properties of the obtained Si─Al─C─N ceramic materials were systematically investigated. The microstructure and chemical composition of the dense, predominantly amorphous monolithic Si─Al─C─N were characterized using solid‐state nuclear magnetic resonance, scanning electron microscopy, and transmission electron microscopy. Aluminum incorporation led to enhanced densification of Si─C─N, resulting in monoliths with a porosity fraction as low as 2 vol% achieved for the composition with the highest aluminum content. Al incorporation was shown to also result in a significant reduction in thermal conductivity, thus, Si─Al─C─N formulations exhibited values as low as 0.6 W m −1 K −1 . The hardness and Young's modulus remained nearly unchanged upon aluminum incorporation, with values of ca. 14.5 and 156 GPa, respectively, for the high‐aluminum‐content sample. To the best of our knowledge, the present study reports for the first time on the thermal and mechanical properties of dense, mainly amorphous Si─Al─C─N ceramics, highlighting the suitability of Si─Al─C─N as excellent material for possible thermal insulation at temperatures beyond 1000°C.
SN - 1546-542X
SN - 1744-7402
ER -