Abstract
Silicon carbide fiber-reinforced silicon carbide matrix composites (SiCf/SiC) are considered as one of the candidates for blanket materials in future fusion reactors. Generally, densification of SiC needs sintering additives due to the covalent nature of Si-C bonding, and sintering additives such as Al2O3, Y2O3, and YAG are frequently added to SiC. However, neutron irradiation effects of sintering additives on SiCf/SiC composite properties are still unclear. In this study, oxide sintering additives such as Al2O3, Y2O3, YAG and an Al2O3-Y2O3-CaO mixture (abbreviated as AYC), were irradiated up to the neutron fluency of 2.0∼2.5×1024 n/m2 (E>0.1MeV) at 333∼363K in the BR2 reactor. Macroscopic swelling and change in lattice parameter due to the irradiation were measured. Length changes of the Y2O3 and Al2O3 specimens were ∼0.2% but that of YAG specimen was very large, 3.86%. Macroscopic length swelling of the AYC was at the midpoint of both figures. Crystallinity of the YAG specimen was greatly reduced and many micro cracks were observed after the irradiation. Lattice parameter change of the YAG specimen was large (1.41%), however it was still smaller than the macroscopic length change. The relative correlation of macroscopic length increase and those of lattice parameters of the Y2O3 and Al2O3 specimens was high.
| Original language | English |
|---|---|
| Pages (from-to) | 306-312 |
| Number of pages | 7 |
| Journal | Unknown Journal |
| Volume | 71 |
| DOIs | |
| Publication status | Published - 1 May 2015 |
| Externally published | Yes |
Fingerprint
Keywords
- AlO
- Neutron irradiation effects
- SiC/SiC composites
- YO
- YAG
ASJC Scopus subject areas
- Energy(all)
Cite this
Neutron Irradiation Effects of Oxide Sintering Additives for SiCf/SiC Composites. / Konishi, Hiroshi; Idris, Mohd Idzat; Imai, Masamitsu; Yoshida, Katsumi; Yano, Toyohiko.
In: Unknown Journal, Vol. 71, 01.05.2015, p. 306-312.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Neutron Irradiation Effects of Oxide Sintering Additives for SiCf/SiC Composites
AU - Konishi, Hiroshi
AU - Idris, Mohd Idzat
AU - Imai, Masamitsu
AU - Yoshida, Katsumi
AU - Yano, Toyohiko
PY - 2015/5/1
Y1 - 2015/5/1
N2 - Silicon carbide fiber-reinforced silicon carbide matrix composites (SiCf/SiC) are considered as one of the candidates for blanket materials in future fusion reactors. Generally, densification of SiC needs sintering additives due to the covalent nature of Si-C bonding, and sintering additives such as Al2O3, Y2O3, and YAG are frequently added to SiC. However, neutron irradiation effects of sintering additives on SiCf/SiC composite properties are still unclear. In this study, oxide sintering additives such as Al2O3, Y2O3, YAG and an Al2O3-Y2O3-CaO mixture (abbreviated as AYC), were irradiated up to the neutron fluency of 2.0∼2.5×1024 n/m2 (E>0.1MeV) at 333∼363K in the BR2 reactor. Macroscopic swelling and change in lattice parameter due to the irradiation were measured. Length changes of the Y2O3 and Al2O3 specimens were ∼0.2% but that of YAG specimen was very large, 3.86%. Macroscopic length swelling of the AYC was at the midpoint of both figures. Crystallinity of the YAG specimen was greatly reduced and many micro cracks were observed after the irradiation. Lattice parameter change of the YAG specimen was large (1.41%), however it was still smaller than the macroscopic length change. The relative correlation of macroscopic length increase and those of lattice parameters of the Y2O3 and Al2O3 specimens was high.
AB - Silicon carbide fiber-reinforced silicon carbide matrix composites (SiCf/SiC) are considered as one of the candidates for blanket materials in future fusion reactors. Generally, densification of SiC needs sintering additives due to the covalent nature of Si-C bonding, and sintering additives such as Al2O3, Y2O3, and YAG are frequently added to SiC. However, neutron irradiation effects of sintering additives on SiCf/SiC composite properties are still unclear. In this study, oxide sintering additives such as Al2O3, Y2O3, YAG and an Al2O3-Y2O3-CaO mixture (abbreviated as AYC), were irradiated up to the neutron fluency of 2.0∼2.5×1024 n/m2 (E>0.1MeV) at 333∼363K in the BR2 reactor. Macroscopic swelling and change in lattice parameter due to the irradiation were measured. Length changes of the Y2O3 and Al2O3 specimens were ∼0.2% but that of YAG specimen was very large, 3.86%. Macroscopic length swelling of the AYC was at the midpoint of both figures. Crystallinity of the YAG specimen was greatly reduced and many micro cracks were observed after the irradiation. Lattice parameter change of the YAG specimen was large (1.41%), however it was still smaller than the macroscopic length change. The relative correlation of macroscopic length increase and those of lattice parameters of the Y2O3 and Al2O3 specimens was high.
KW - AlO
KW - Neutron irradiation effects
KW - SiC/SiC composites
KW - YO
KW - YAG
UR - http://www.scopus.com/inward/record.url?scp=84970974370&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84970974370&partnerID=8YFLogxK
U2 - 10.1016/j.egypro.2014.11.883
DO - 10.1016/j.egypro.2014.11.883
M3 - Article
AN - SCOPUS:84970974370
VL - 71
SP - 306
EP - 312
JO - Journal of Water Process Engineering
JF - Journal of Water Process Engineering
SN - 2214-7144
ER -