Effects of the crystal phase and microstructure of pottery bodies on the transmission characteristics of terahertz waves
Effects of the crystal phase and microstructure of pottery bodies on the transmission characteristics of terahertz waves
复制标题
DOI：
10.1080/21870764.2021.1889454
复制
发表时间：
2021-03
影响因子：
2.3
通讯作者：
Seiji Niijima;Hiroaki Taniguchi;Hideki Matsuda;N. Hashimoto;K. Murate;K. Kawase
中科院分区：
文献类型：
--
作者：
Seiji Niijima;Hiroaki Taniguchi;Hideki Matsuda;N. Hashimoto;K. Murate;K. Kawase
摘要 我们最近报道了陶体的太赫兹（THz）波特性随烧成温度的变化而显着变化。这表明通过太赫兹波分析对陶瓷的可烧结性和制造过程管理进行无损检测的可行性。然而，目前尚不清楚为什么陶瓷的太赫兹波特性会随着烧成温度而变化。在这项研究中，我们利用太赫兹时域光谱评估了在不同温度下烧成的低温烧结瓷体的太赫兹波传输特性，并研究了晶相与微观结构之间的关系。我们发现太赫兹波透过率随着高岭石的脱水而增加，并随着体内莫来石和玻璃相的形成而降低。此外，随着烧成温度的升高，这些物体的太赫兹波透射率会因孔隙的形成而受到散射的影响。此外，太赫兹范围内的折射率与体积密度表现出良好的相关性。我们确定太赫兹范围内折射率的烧成温度依赖性与晶相和微观结构有关。
ABSTRACT We recently reported that the terahertz (THz)-wave characteristics of pottery bodies varied significantly with firing temperature. This suggested the feasibility of conducting nondestructive inspection of the sinterability and manufacturing-process management of ceramics by THz-wave analysis. However, it is not clear why the THz-wave characteristics of ceramics change with firing temperature. In this study, we evaluated the THz-wave transmission properties of low-temperature-sintered porcelain bodies fired at various temperatures using THz time-domain spectroscopy and investigated the relationship between the crystal phase and microstructure. We found that the THz-wave transmittance increased with the dehydration of kaolinite and decreased with the formation of mullite and glass phases in the body. Also, as the firing temperature increased, the THz-wave transmittance of these bodies was affected by scattering due to the formation of pores. Additionally, the refractive index in the THz range showed a good correlation with the bulk density. We established that the firing-temperature dependence of the refractive index in the THz range was related to the crystal phase and microstructure.