Cavity Swelling Behavior in SiC/SiC Under Charged Particle Irradiation

Journal Article · Sun May 15 04:00:00 EDT 2005 · Fusion Science and Technology

OSTI ID:20854018

Ozawa, Kazumi; Kondo, Sosuke; Hinoki, Tatsuya; Jimbo, Kouichi; Kohyama, Akira ^[1]

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1. Kyoto University (Japan)

The microstructural evolution of SiC/SiC composites after Si{sup 2+} with/without He{sup +} ion irradiation was studied using transmission electron microscopy. The temperature, displacement damage level, and He/dpa ratio were 1273/1673K, 10/100dpa and 0/60appmHe/dpa, respectively. In 10dpa single-ion irradiation, no cavity was detected at 1273 and 1673K. But cavities were observed locally at 1673K, 100dpa. In dual-ion irradiation, cavities were observed at 1673K, 100dpa. Helium bubbles (d<5nm) were formed densely on {l_brace}111{r_brace} faulted planes in the fiber and matrix. And lens-shaped cavities (major axis 2a=20-50nm) were formed on grain boundaries in the matrix. The swelling by cavities in CVI matrix is about 0.5% at 80dpa and 0.7% at 130dpa. Loss of PyC layer beneath the irradiated surface was observed (single-ion: about 500nm, dual-ion: about 1 {mu}m). And the thickness of the PyC layer expands after single/dual-ion irradiation (single-ion: 12%, dual-ion: 29% increase). But Tyranno-SA/PyC/CVI composites shows showed better microstructural stability than expected at 1673K.

• OSTI ID: 20854018
• Journal Information: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 4 Vol. 47; ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ATOMIC DISPLACEMENTS
FIBERS
GRAIN BOUNDARIES
HELIUM
HELIUM IONS
IRRADIATION
LAYERS
PHASE STABILITY
SILICON IONS
SURFACES
SWELLING
THERMONUCLEAR REACTOR MATERIALS
THICKNESS
TRANSMISSION ELECTRON MICROSCOPY