Masai Hirokazu, Kimura Hiromi, Kitamura Naoyuki, Ikemoto Yuka, Kohara Shinji, Masuno Atsunobu, Fujii Yasuhiro, Miyazaki Takamichi, Yanagida Takayuki
Department of Materials and Chemistry, National Institute of Advanced Industrial Science and Technology, 1-8-31 Midorigaoka, Ikeda, Osaka, 563-8577, Japan.
Graduate School of Materials Science, Nara Institute of Science and Technology, 8916-5, Takayama-cho, Ikoma, Nara, 630-0192, Japan.
Sci Rep. 2022 Aug 30;12(1):14761. doi: 10.1038/s41598-022-18892-4.
Recently, spark plasma sintering (SPS) has become an attractive method for the preparation of solid-state ceramics. As SPS is a pressure-assisted low-temperature process, it is important to examine the effects of temperature and pressure on the structural properties of the prepared samples. In the present study, we examined the correlation between the preparation conditions and the physical and structural properties of SiO glasses prepared by SPS. Compared with the conventional SiO glass, the SPS-SiO glasses exhibit a higher density and elastic modulus, but a lower-height first sharp diffraction peak of the X-ray total structure factor. Micro-Raman and micro-IR spectra suggest the formation of heterogeneous regions at the interface between the SiO powders and graphite die. Considering the defect formation observed in optical absorption spectra, reduction reaction mainly affects the densification of SPS-SiO glass. Hence, the reaction at the interface is important for tailoring the structure and physical properties of solid-state materials prepared by the SPS technique.
最近，放电等离子体烧结（SPS）已成为制备固态陶瓷的一种有吸引力的方法。由于SPS是一种压力辅助低温工艺，研究温度和压力对所制备样品结构性能的影响很重要。在本研究中，我们研究了SPS制备的SiO玻璃的制备条件与物理和结构性能之间的相关性。与传统SiO玻璃相比，SPS-SiO玻璃具有更高的密度和弹性模量，但X射线总结构因子的第一尖锐衍射峰高度较低。显微拉曼光谱和显微红外光谱表明在SiO粉末与石墨模具的界面处形成了异质区域。考虑到在光吸收光谱中观察到的缺陷形成，还原反应主要影响SPS-SiO玻璃的致密化。因此，界面处的反应对于调整通过SPS技术制备的固态材料的结构和物理性能很重要。
