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Corrosion behavior of refractory metals in liquid lead at 1000 °C for 1000 h
Zunqi Xiao,Jing Liu,Zhizhong Jiang,Lin Luo 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
Lead-based fast reactor (LFR) has become one of the most promising reactors for Generation IV nuclearsystems. A developing trend of LFR is high efficiency, along with operation temperatures up to 800 C oreven higher. One of key issues in the high-efficiency LFR is corrosion of cladding materials with lead athigh temperatures. In this study, corrosion behavior of some refractory metals (Nb, Nb521, and Mo-0.5La)was investigated in static lead at 1000 C for 1000 h. The results showed that Nb and Nb521 exhibited anintense dissolution corrosion with obvious lead penetration after corrosion, and lead penetrationextended along the grain boundaries of the specimens. Furthermore, Nb521 showed a better corrosionresistance than that of Nb as a result of the elements of W and Mo included in Nb521. Mo-0.5La showedmuch better corrosion resistance than that of Nb and Nb521, and no lead penetration could be observed. However, an etched morphology appeared on the surface of Mo-0.5La, indicating the occurrence ofcorrosion to a certain degree. The results indicate that Mo-0.5La is compatible with lead up to 1000 C. While Nb and
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Zunqi Xiao,Jing Liu,Zhizhong Jiang,Lin Luo,Qunying Huang 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.6
The liquid lead-lithium (Pbe17Li) blanket has many applications in fusion reactors due to its good tritiumbreeding performance, high heat transfer efficiency and safety. The compatibility of liquid Pbe17Li alloywith the structural material of blanket under magnetic field is one of the concerns. In this study,corrosion experiments China low activation martensitic (CLAM) steel and 316L steel were carried out in aforced convection Pbe17Li loop under 1.0 T magnetic field at 480 C for 1000 h. The corrosion results on316L steel showed the characteristic with a superficial porous layer resulted from selective leaching ofhigh-soluble alloy elements and subsequent phase transformation from austenitic matrix to ferriticphase. Then the porous layers were eroded by high-velocity jet fluid. The main corrosion mechanism ofCLAM steel was selective dissolution-base corrosion attack on the microstructure boundary regions andexclusively on high residual stress areas. CLAM steel performed a better corrosion resistance than that of316L steel. The high Ni dissolution rate and the erosion of corroded layers are the main causes for thesevere corrosion of 316L steel.
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Design and properties analysis of total internal reflection gratings for pulse compressor at 1053 nm
Qunyu Bi,Jiangjun Zheng,Ailin Guo,Meizhi Sun,Jianpeng Wang,Fuling Zhang,Qingwei Yang,Xinglong Xie,Zunqi Lin 한국물리학회 2011 Current Applied Physics Vol.11 No.1
High-efficiency compression gratings based on total internal reflection (TIR) are promising alternatives of compressor gratings because of their high diffraction efficiency, potential high damage resistant ability,and compact structure. Dependence of the 1 order diffraction efficiencies on grating parameters is analyzed for TE- and TM-polarized incident light of 1053 nm at Littrow angle, which is calculated by using the rigorous coupled-wave analysis. A more intuitional view on the relation is offered through three-dimensional slicing figures instead of two-dimensional ones. The performances of high-efficiency gratings are compared and regarded as criteria for further choices, including spectral bandwidth, angle bandwidth, dispersion, and intensity distribution. For TE- and TM-irradiations, similar spectral bandwidth and angle bandwidth can be achieved by different grating parameters. However, the computer simulation result on the intensity distributions of the two polarized waves shows that such design should be used under the illumination of TE-polarized wave for lower intensity enhancement ratio,which is an important factor related to the gratings’ damage threshold.
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