Generation IV_GFR Materials Program FY-2006 Summary Report: Proton Irradiation Study of GFR Candidate Ceramics
Generation IV_GFR Materials Program FY-2006 Summary Report: Proton Irradiation Study of GFR Candidate Ceramics
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发表时间：
2006
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通讯作者：
T. Allen
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作者：
T. Allen
这是一个为期一年的计划，旨在研究由于质子辐照而导致的GFR候选陶瓷的微结构变化。它延续了之前使用重离子辐照的同一套陶瓷的工作。根据材料的不同，有5种陶瓷(ZRC、ZrN、TiC、TiN和6H-碳化硅)在800℃的温度下以2.6 MeV的质子辐照，每个陶瓷的剂量范围为1.5至3.0 dpa。辐照后检查揭示了质子辐照引起的微观结构变化。用Holz图样估算的6H-SiC样品在1.5dpa以下没有观察到晶格常数的变化，而对于ZrC和ZrN样品则在3.0dpa以下没有观察到辐照后晶格常数的变化。与800℃~10 dpa的Kr离子辐照相比，3.0 dpa的质子辐照对陶瓷晶格结构的损伤较小，表现为Holz线型和菊池花样的可见性。辐照后的样品出现了Kr离子辐照样品中未观察到的缺陷环。辐照后的氮化锆膜的微观结构变化最小。经3.0dpa辐照后的6H-SiC微结构由高密度的黑点状缺陷组成。
This is a 1-year program to investigate the microstructural changes in GFR candidate ceramics due to proton irradiation. It continues the previous work on the same set of ceramics which used heavy ion irradiation. There are 5 ceramics (ZrC, ZrN, TiC, TiN and 6H-SiC) irradiated with 2.6 MeV protons at a temperature of 800oC to a single dose for each ceramic in the range of 1.5 to 3.0 dpa depending on the material. Post-irradiation examination reveals the microstructural changes due to proton irradiation. The change of lattice constant evaluated using HOLZ patterns is not observed for the irradiated samples up to 1.5 dpa for 6H-SiC and up to 3.0 dpa for ZrC and ZrN. In contrast to Kr ion irradiation at 800oC to 10 dpa, the proton-irradiated ceramics at 3.0 dpa show less irradiation damage to the lattice structure evidenced by the visibility of the HOLZ line pattern and Kikuchi pattern. The irradiated ZrC exhibits faulted loops which are not observed in the Kr ion irradiated sample. The irradiated ZrN shows the least microstructural change from proton irradiation. The microstructure of 6H-SiC irradiated to 3.0 dpa consists of black dot type of defects at high density.