Thermal decomposition of titanium hydride and its application to low pressure hydrogen control
作者:
Yoshihiko Hirooka,
期刊:
Journal of Vacuum Science&Technology A: Vacuum, Surfaces, and Films
(AIP Available online 1984)
卷期:
Volume 2,
issue 1
页码: 16-21
ISSN:0734-2101
年代: 1984
DOI:10.1116/1.572617
出版商: American Vacuum Society
关键词: titanium hydrides;decomposition;high temperature;hydrogen;enthalpy;phase transformations;vapor pressure;pressure control;high vacuum;medium vacuum;vacuum systems;TiH2
数据来源: AIP
摘要:
Thermal decomposition behavior of titanium hydride (TiH2) powder at temperatures between 250 and 330 °C (523 and 603 K) has been studied from both thermodynamic and kinetic viewpoints. Equilibrium hydrogen pressure measured in a closed system was found to vary from the order of 10−3to 10−2Torr (10−1to 1 Pa) and the enthalpy of formation of titanium hydride in the two phase (α+γ) region was evaluated to be 31 kcal/mol (130 kJ/mol). It has been found that steady state decomposition can be realized also in an open (continuously pumped) system as long as the two phases coexist. Hydrogen pressure at the steady state was in the order from 10−4to 10−3Torr (10−2to 10−1Pa) and the activation energy for the decomposition was determined to be 29 kcal/mol (122 kJ/mol). In addition, it has been demonstrated that hot titanium hydride can simply be applied to low pressure hydrogen control in vacuum systems.
点击下载:
PDF
(420KB)
返 回