STEAM OXIDATION KINETICS AND OXYGEN DIFFUSION IN UO2 AT HIGH TEMPERATURES

被引:29
作者
BITTEL, JT
SJODAHL, LH
WHITE, JF
机构
[1] Missile and Space Division, General Electric Company, Cincinnati, Ohio
关键词
D O I
10.1111/j.1151-2916.1969.tb11976.x
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Results of steam oxidation measurements of UO2 cylinders from 885° to 1835°C may be expressed by the equations: (Formula Presented.) for the parabolic rate of oxidation and (Formula Presented.) for the chemical oxygen diffusion coefficient. Kp and Dc, obtained from thermobalance measurements to 1500° C and from pre‐ and post‐test weights for the higher temperatures, were independent of sample weight from 10 to 149 g and of surfaceto‐volume ratios from 2.34 to 18.74 cm‐1. Dc varied as the 0.65 power of the final average excess oxygen (x in UO2+x). The oxidation was accompanied by considerable grain growth. A bulk diffusion mechanism was verified by analyses of partially oxidized samples using both X‐ray diffraction and analytical chemistry; an oxygen gradient was demonstrated by each technique. Copyright © 1969, Wiley Blackwell. All rights reserved
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页码:446 / &
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