热电偶
微观结构
扫描电子显微镜
微晶
电动势
材料科学
制作
单晶
热电效应
复合材料
光学
结晶学
化学
冶金
电气工程
替代医学
病理
工程类
物理
热力学
医学
作者
Rikito Murakami,Kei Kamada,Yasuhiro Shoji,Yuui Yokota,Masao Yoshino,Shunsuke Kurosawa,Yuji Ohashi,Akihiro Yamaji,Akira Yoshikawa
标识
DOI:10.1016/j.jcrysgro.2018.01.018
摘要
The fabrication and thermal electromotive force characteristics of Ir/Ir-Rh thermocouples capable of repeated bending deformation are described. Ir and Ir-Rh wires with a diameter of 0.5 mm were fabricated using the alloy-micro-pulling-down method. Scanning electron microscopy and electron backscattering diffraction of the radial cross section of the grown wires were performed to investigate the microstructure and orientation of the crystal grains. At the start of growth, the microstructure was polycrystalline with diameters of several hundred micrometers, while at the 8-m growth point it was found to be monocrystalline. The observed single crystals of pure Ir and Ir-Rh alloy were oriented in the 〈1 1 3〉 and 〈1 1 2〉 directions, respectively, whereas the polycrystalline Ir-Rh samples showed preferential growth in the 〈1 0 0〉 direction. The thermal electromotive force of the fabricated Ir/Ir-Rh thermocouple was measured by the comparison technique and the fixed-point technique, and the thermoelectric power was estimated to be 5.9 μV/°C in the range from 600°C to 1100°C.
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