Helium release behavior from He-ion implanted SiC/SiC, monolithic beta-SiC, and SiC fiber (Hi-Nicalon) was studied using the thermal desorption method with annealing temperatures between 500?C and 1600?C in 100?C increments. Helium release from SiC/SiC composites began below 500?C, while from monolithic b-SiC, helium release was observed above 1000?C. The magnitude of the helium released from b-SiC was 1/10 to 1/50 of the helium released from the composites. Helium release from the fiber became apparent above 1300?C. Helium release from composites at low temperature might be attributed to helium release from the carbon interphase. Behavior of transmuted helium in the SiC/SiC composites under fusion reactor conditions is discussed.
Revised: March 28, 2003 |
Published: December 1, 2000
Citation
Hasegawa A., B.M. Oliver, S. Nogami, K. Abe, and R.H. Jones. 2000.Study of Helium Effects in SiC/SiC Composites under Fusion Reactor Environment.Journal of Nuclear Materials 283-287, no. Part 2:811-815.PNNL-SA-31665.