TY - JOUR
T1 - Effects of gas phase impurities on the topochemical-kinetic behaviour of uranium hydride development
AU - Bloch, J.
AU - Brami, D.
AU - Kremner, A.
AU - Mintz, M. H.
N1 - Funding Information:
This researchw as partially supported by a joint grant from the Israel Council for Higher Education and the Israel Atomic Energy Commission.
PY - 1988/1/1
Y1 - 1988/1/1
N2 - The hydriding kinetics of bulk uranium and U-0.1wt.%Cr, in the presence of oxidizing gaseous impurities (oxygen and CO), were studied by combined rate measurements and metallographic examinations of partially reacted samples. The effect of the gaseous impurity (type and concentration) was examined metallographically, and the kinetic data were discussed in relation to these examinations. Below about 100 °C the reaction of uranium with pure hydrogen consists of the following sequence of steps: 1. (i) surface nucleation; 2. (ii) homogeneous growth (pitting); 3. (iii) relatively fast lateral growth leading to the formation of a reaction front which penetrates into the sample at a constant rate. The effects of oxygen and CO on the hydriding kinetics were related to their abilities to block hydrogen penetration into the uranium. Thus, it was found that oxygen affects only the penetration through the oxide layer, whereas CO affects the penetration through both the oxide and hydride layers.
AB - The hydriding kinetics of bulk uranium and U-0.1wt.%Cr, in the presence of oxidizing gaseous impurities (oxygen and CO), were studied by combined rate measurements and metallographic examinations of partially reacted samples. The effect of the gaseous impurity (type and concentration) was examined metallographically, and the kinetic data were discussed in relation to these examinations. Below about 100 °C the reaction of uranium with pure hydrogen consists of the following sequence of steps: 1. (i) surface nucleation; 2. (ii) homogeneous growth (pitting); 3. (iii) relatively fast lateral growth leading to the formation of a reaction front which penetrates into the sample at a constant rate. The effects of oxygen and CO on the hydriding kinetics were related to their abilities to block hydrogen penetration into the uranium. Thus, it was found that oxygen affects only the penetration through the oxide layer, whereas CO affects the penetration through both the oxide and hydride layers.
UR - http://www.scopus.com/inward/record.url?scp=0024016854&partnerID=8YFLogxK
U2 - 10.1016/0022-5088(88)90019-7
DO - 10.1016/0022-5088(88)90019-7
M3 - Article
AN - SCOPUS:0024016854
SN - 0022-5088
VL - 139
SP - 371
EP - 383
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
IS - 2
ER -