High-Temperature Differential Scanning Calorimetry

该奖项由密苏里大学罗拉分校（UMR）材料研究部授予，旨在研究高温差示扫描量热计（HTDSC）在1500摄氏度或更高温度下测量过渡材料热容量和焓的有效性和可靠性。调查将使用标准校准程序测量“未知”金和氧化钛的热容，并将其与先前确定的值进行比较。在为每个实验条件重新校准后，将评估样品加热速率、样品质量、覆盖气体的选择和样品支架材料对准确性和不确定度的影响。实验计划的第二阶段将检验HTDSC测量转变焓的能力，重点是金的熔化焓和氧化钕（Nd2O3）中的α - β转变焓。确定与这些转变相关的温度和焓变可以准确再现的条件将进一步提高HTDSC的实用性。UMR HTDSC能力的可用性将促进与其他研究机构的合作，测量高温吉布斯能或新陶瓷或金属相的形成焓。本研究将建立适用于高温差示扫描量热计（HTDSC）材料研究的实验程序。此外，该奖项的研究将提高美国在高温研究方面的能力，并制定一项研究协议，可供本科生和高中生以及研究生助理使用。这项研究将允许HTDSC整合到密苏里大学罗拉分校（UMR）现有的本科生研究和高中生互动项目中。

This award by the Division of Materials Research to University of Missouri Rolla (UMR) is to investigate the usefulness and reliability of a high-temperature differential scanning calorimeter (HTDSC) to measure heat capacities and enthalpies of transition materials at temperatures of 1500 degrees C or higher. The investigation will measure the heat capacities of "unknowns" gold and ti-tanium oxide, using standard calibration procedures, comparing them against previously deter-mined values. The impact of sample heating rate, sample mass, choice of cover gas, and sample holder material on the accuracy and uncertainty level will be assessed, after recalibrating for each experimental condition. A second phase of the experimental program will examine the ability of HTDSC to measure enthalpies of transition, focusing on the enthalpy of melting of gold and that of the alpha-beta transition in neodymium oxide (Nd2O3). Determining the conditions un-der which the temperature and enthalpy change associated with these transitions can be accu-rately reproduced will improve the usefulness of HTDSC still further. The availability of HTDSC capability at UMR will facilitate cooperation with other research facilities measuring high-temperature Gibbs energies or enthalpies of formation of new ceramic or metallic phases.This investigation will establish appropriate experimental procedures for high-temperature dif-ferential scanning calorimeter (HTDSC) study of materials. In addition, research studies by this award will enhance U.S. capabilities in high-temperature research, and create a research protocol that can be used by undergraduates and high-school students as well as graduate assistants. This research will allow integration of HTDSC into existing programs at the University of Missouri - Rolla (UMR) for undergraduate research and interaction with high-school students.