HELIUM RELEASE AND MICROSTRUCTURE OF NEUTRON-IRRADIATED SIC CERAMICS

被引：39

作者：

SASAKI, K

YANO, T

MARUYAMA, T

ISEKI, T

机构：

[1] Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152, O-okayama

来源：

JOURNAL OF NUCLEAR MATERIALS | 1991年 / 179卷

关键词：

D O I：

10.1016/0022-3115(91)90111-J

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

alpha-SiC ceramics containing B-10 were neutron-irradiated in the JMTR to a fluence of 6.0 x 10(24) n/m2 (E > 1 MeV) at 650-degrees-C. Helium release from SiC ceramics and powders was measured up to 2000-degrees-C. Microstructural observation by TEM was also carried out on SiC specimens annealed at temperatures in the range 1200-2000-degrees-C. The helium release rate of the powder specimen started to increase at about 800-degrees-C and two peaks were observed at 1100 and 1260-degrees-C. By contrast, the sintered specimen showed a low gas release rate up to 1800-degrees-C and exhibited a rapid increase above this temperature. The helium release mechanism from the sintered specimen was discussed in terms of the mobility of helium atoms and vacancies, and bubbles at grain boundaries.

引用

页码：407 / 410

页数：4

共 7 条

[1]

CAREY AM, 1981, J NUCL MATER, V103, P789

[2] MECHANICAL, THERMAL, AND MICROSTRUCTURAL PROPERTIES OF NEUTRON-IRRADIATED SIC [J].