Effect of sintering parameters on microstructure and properties of transparent AlON ceramics via tape casting
- 1Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education, Engineering Research Center of Spin Quantum Sensor Chips, School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi Province, P. R. China
Abstract
Transparent aluminum oxynitride (AlON) ceramics are promising materials for optical windows and substrates for laser transmission, optical storage, photodetection, and wave-transparent electronic applications because of their high transparency, mechanical robustness, thermal stability, and stable dielectric response. Nevertheless, scalable fabrication of transparent AlON sheets remains challenging because it requires the formation of defect-free green bodies and the elimination of residual pores during sintering. In this work, high-purity AlON powder prepared by carbothermal reduction and nitridation was processed into green tapes through a nonaqueous tape-casting route, followed by hot-press lamination and pressureless sintering. The effects of slurry formulation, lamination parameters, and especially the sintering holding time at [Formula: see text]C on microstructure and properties were systematically examined. Prolonging the holding time promoted densification, grain development, pore elimination, and a corresponding increase in in-line transmittance, residual pores are mainly light-scattering centers in transparent ceramics, rather than intrinsic absorption sites. At the optimized holding time, 2 mm-thick AlON ceramics showed a maximum in-line transmittance of 80.2% over the 200–1400[Formula: see text]nm range, a bending strength of 343 MPa, and a Vickers hardness of 18.5 GPa. The relative density increased to approximately 99.8% of the theoretical value, and the dielectric constant approached the intrinsic value expected of dense AlON. The results provide a practical processing basis for preparing transparent AlON ceramic sheets, while further optimization is still required for reliable fabrication of larger-area substrates.
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BibTeX
@article{kong2026effect,
title = {{Effect of sintering parameters on microstructure and properties of transparent AlON ceramics via tape casting}},
author = {Zhenzhu Kong and Lin Han and Yuanlin Li and Xiangzhao Meng and Bin Peng and Yanan Zhao},
journal = {Journal of Advanced Dielectrics},
year = {2026},
month = oct,
doi = {10.1142/s2010135x26400084},
url = {https://doi.org/10.1142/s2010135x26400084},
note = {CC BY},
}
RIS
TY - JOUR
TI - Effect of sintering parameters on microstructure and properties of transparent AlON ceramics via tape casting
AU - Zhenzhu Kong
AU - Lin Han
AU - Yuanlin Li
AU - Xiangzhao Meng
AU - Bin Peng
AU - Yanan Zhao
PY - 2026
DA - 2026/10/26
JO - Journal of Advanced Dielectrics
DO - 10.1142/s2010135x26400084
UR - https://doi.org/10.1142/s2010135x26400084
AB - Transparent aluminum oxynitride (AlON) ceramics are promising materials for optical windows and substrates for laser transmission, optical storage, photodetection, and wave-transparent electronic applications because of their high transparency, mechanical robustness, thermal stability, and stable dielectric response. Nevertheless, scalable fabrication of transparent AlON sheets remains challenging because it requires the formation of defect-free green bodies and the elimination of residual pores during sintering. In this work, high-purity AlON powder prepared by carbothermal reduction and nitridation was processed into green tapes through a nonaqueous tape-casting route, followed by hot-press lamination and pressureless sintering. The effects of slurry formulation, lamination parameters, and especially the sintering holding time at [Formula: see text]C on microstructure and properties were systematically examined. Prolonging the holding time promoted densification, grain development, pore elimination, and a corresponding increase in in-line transmittance, residual pores are mainly light-scattering centers in transparent ceramics, rather than intrinsic absorption sites. At the optimized holding time, 2 mm-thick AlON ceramics showed a maximum in-line transmittance of 80.2% over the 200–1400[Formula: see text]nm range, a bending strength of 343 MPa, and a Vickers hardness of 18.5 GPa. The relative density increased to approximately 99.8% of the theoretical value, and the dielectric constant approached the intrinsic value expected of dense AlON. The results provide a practical processing basis for preparing transparent AlON ceramic sheets, while further optimization is still required for reliable fabrication of larger-area substrates.
SN - 2010-1368
SN - 2010-135X
ER -