Improvement of ultrahigh-temperature calorimeter and precise measurements for heat capacity

超高温量热仪的改进和热容的精确测量

• 批准号: 17560596
• 负责人: ARITA Yuji
• 金额: $ 2.11万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17560596/
• 关键词: Specific Heat Capacity; Ceramics; High Temperature Property; Phase Transition; 熱容量; 高温; 熱量計; 導電率

Improvements of direct heating pulse calorimeter (DHPC) have done. Details is shown below as :(1) maximum measurement temperature up to 2000 K(2) improve the precision(3) expansion of measuring objectsTo heat up to 2000 K, the material of main heater was changed from tantalum to carbon composite (C/C). To avoid the reaction between thermocouple and sample at high temperatures, a pyrometer was considered a good for the contactless temperature sensor. We studied the performance of a multi wave pyrometer to decide an absolute temperature exactly. However the time resolution of the multi wave pyrometer was not fast enough. Therefore the high-speed single wave pyrometer was used at the same time with the multi wave pyrometer.It had been difficult to measure heat capacities of the high resistant sample and/or small samples with DHPC. In this study a sample of Sr(Zr,Y)O_3 which had a electrical conductivity about 11.3×10^<-6>Sm^<-1> was tried to measure heat capacity and indicated successful result. Meanwhile, the heat capacity for a small sample of HfHx (1mm×1mm×15mm) could be measured.

直热式脉冲量热仪（DHPC）的改进如下：（1）最高测量温度达到2000K（2）提高测量精度（3）测量对象的扩展将材料加热至2000K。主加热器从钽改为碳复合材料（C/C） 为了避免热电偶和样品在高温下发生反应，高温计被认为是非接触式温度传感器的良好选择。然而，多波高温计的时间分辨率不够快，因此高速单波高温计与多波高温计同时使用，测量热容非常困难。在本研究中，Sr(Zr,Y)O_3 样品的电导率约为 11.3×10^<-6>Sm^<-1>。尝试测量热容并取得了成功，同时可以测量HfHx小样品（1mm×1mm×15mm）的热容。

项目成果

Development of high temperature calorimeter : heat capacity measurement by direct heating pulse calorimetry

高温量热仪的开发：直接加热脉冲量热法测量热容量

• 发表时间: 2005
• 期刊: J.Physics, Chemistry of Solids 66
• 作者: Y.Arita;K.Suzuki;T.Matsui
• 通讯作者: T.Matsui