THERMAL EROSION OF GRAPHITE BY PULSED ELECTRON-BEAM

被引：1
|
作者：
NISHIKAWA, S
SAWADA, M
MARUKAWA, Y
SON, P
MIYAKE, M
机构：
[1] Department of Nuclear Engineering, Faculty of Engineering, Osaka University, 565 Osaka, 2-1 Yamadaoka, Suita
来源：
JOURNAL OF NUCLEAR MATERIALS | 1991年 / 179卷
关键词：
D O I：
10.1016/0022-3115(91)90055-C
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Electron beam heating tests were performed for several kinds of isotropic graphite to evaluate the dependence of thermal erosion behavior on the graphite species and on the heat load. The specimens were irradiated by electron beams with power densities of 25 to 45 MW/m2 and a pulse length of 2.0 s. A crater caused by erosion was found to be the major damage and preferential erosion was observed at the grain boundaries. In some kinds of graphite, a large weight loss caused by thermal erosion, which exceeded the expected weight loss due to sublimation, was observed. In these cases, some of the ejected bulk graphite particles that had collected on a Mo sheet were observed with an optical microscope. These results suggest that some kinds of graphite will be eroded mainly by the "particle emission" mechanism under high heat loads.
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页码：176 / 179
页数：4
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