Kinetics of thermal decomposition of niobium hydride

被引：18

作者：

Gabriel, S. B. ^{[1
,2
]}

Brum, M. C. ^{[1
]}

Candioto, K. C. G. ^{[2
]}

Sandim, H. R. Z. ^{[2
]}

Suzuki, P. A. ^{[2
]}

Nunes, C. A. ^{[2
]}

机构：

[1] Univ Fed Rio de Janeiro, Dept Met & Mat Engn, BR-21945970 Rio De Janeiro, Brazil

[2] Univ Sao Paulo, Dept Mat Engn, BR-12600970 Lorena, SP, Brazil

来源：

INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS | 2012年 / 30卷 / 01期

关键词：

Niobium; Dehydriding; Niobium hydride; X-ray diffractometry; HYDROGEN STORAGE; ABSORPTION; DESORPTION;

D O I：

10.1016/j.ijrmhm.2011.06.012

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-purity niobium powders can be obtained from the well-known hydride-dehydride (HDH) process. The aim of this work was the investigation of the structural phase transition of the niobium hydride to niobium metal as function of temperature, heating rate and time. The niobium powder used in this work was obtained by high-temperature hydriding of niobium machining chips followed by conventional ball milling and sieving. X-ray diffraction measurements were carried out in vacuum using a high-temperature chamber coupled to an X-ray diffractometer. During the dehydriding process, it is possible to follow the phase transition from niobium hydride to niobium metal starting at about 380 degrees C for a heating rate of 20 degrees C/min. The heating rate was found to be an important parameter, since complete dehydriding was obtained at 490 degrees C for a heating rate of 20 degrees C/min. The higher dehydriding rate was found at 500 degrees C. Results contribute to a better understanding of the kinetics of thermal decomposition of niobium hydride to niobium metal. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：38 / 41

页数：4

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