Pb-Bi eutectic alloy has been receiving increasing attention as a heavy liquid metal coolant in accelerator driven systems and Generation IV fission reactors. Compatibility of structural materials with liquid PbBi eut...Pb-Bi eutectic alloy has been receiving increasing attention as a heavy liquid metal coolant in accelerator driven systems and Generation IV fission reactors. Compatibility of structural materials with liquid PbBi eutectic alloy at high temperature is one of the issues concerned. In the present study, corrosion tests of T91 steel in stagnant Pb-Bi eutectic alloy in saturated oxygen condition at 450 oC were carried out. After experiments, the thickness and compositional profile of the oxide layer on the specimen were analyzed using SEM and EDX. Analysis results show that the thickness of the oxide layer increases as the exposure time increases from 500 h to 1,000 h. The thickness of the oxide layer remains almost unchanged at 15 to 16 mm from 1,000 to 1,500 h. Formation of a thick and protective oxide layer at 450 oC prevents the penetration of liquid Pb-Bi eutectic alloy into the matrix of the T91 steel.展开更多
As one of candidates for the fuel cladding or structure material used in fourth generation fission and fusiondemonstrate reactor, MAX phase has the properties of both ceramic and metal, such as high melting point, hig...As one of candidates for the fuel cladding or structure material used in fourth generation fission and fusiondemonstrate reactor, MAX phase has the properties of both ceramic and metal, such as high melting point, hightemperaturestability, good erosion resistance and radiation-damage tolerance[1;2]. Max phase is a series of ceramicsof nanolamellar and hexagonal structure. M represents transition element. A represents the third or fourth maingroup element. X represent N and C. In the design of lead-cooled fast reactor, it is required that the materialshould endure the corrosion of liquid Pb-Bi alloy. Therefore, understanding of the oxide layers and their growthmechanisms in LBE is fundamentally important for the development of candidate materials.展开更多
In the Bi-Sr-Ca-Cu-O superconductor system, two superconducting phases (85K and 105K) were found by Maeda et al. By substituting Pb, enhanced superconducting properties and structure stabilization in these compounds h...In the Bi-Sr-Ca-Cu-O superconductor system, two superconducting phases (85K and 105K) were found by Maeda et al. By substituting Pb, enhanced superconducting properties and structure stabilization in these compounds have been reported. Recently, the展开更多
以镉铅砷复合污染土壤为研究对象,将生物可降解络合剂谷氨酸二乙酸四钠[tetrasodium N, N-bis(carboxymethyl)glutamic acid, GLDA]应用于电动治理技术,同时结合投加方式和阴极pH值控制技术,以研究电动治理对土壤中不同重金属的同步去...以镉铅砷复合污染土壤为研究对象,将生物可降解络合剂谷氨酸二乙酸四钠[tetrasodium N, N-bis(carboxymethyl)glutamic acid, GLDA]应用于电动治理技术,同时结合投加方式和阴极pH值控制技术,以研究电动治理对土壤中不同重金属的同步去除效率并探讨其去除机制。结果显示:(1)GLDA明显提高了土壤溶液中重金属的质量浓度,有利于土壤重金属在电场作用下移出土体;(2)阳极投加GLDA有利于As的去除,土壤As总去除率可达60.7%,但土壤环境过碱时不利于Cd和Pb的移除;(3)阴极投加GLDA结合pH值控制处理中Cd和Pb的总去除率分别可达35.9%和23.7%,在所有处理中最高,且As的去除率(42.3%)也仅低于阳极投加GLDA处理,是一种较优的同步去除Cd、Pb和As的方法;(4)电动处理后土壤pH值和电导率依处理不同会发生较大变化,总体趋势为阳极附近土壤pH值低于阴极附近,且土壤电导率普遍升高。研究结果为GLDA在重金属复合污染土壤电动治理中的应用提供了理论基础和技术支持。展开更多
基金Project (20110491492) supported by the China Postdoctoral Science FoundationProject (20114BAB216017) supported by the Natural Science Foundation of Jiangxi Province, ChinaProject (GJJ12035) supported by the Science Foundation of the Educational Department of Jiangxi Province, China
基金financially supported by the Strategic Priority Research Program CAS under Grant No.XDA03010304the National Science Foundation of China under Grant No.91226204the Youth Innovation Promotion Association CAS
文摘Pb-Bi eutectic alloy has been receiving increasing attention as a heavy liquid metal coolant in accelerator driven systems and Generation IV fission reactors. Compatibility of structural materials with liquid PbBi eutectic alloy at high temperature is one of the issues concerned. In the present study, corrosion tests of T91 steel in stagnant Pb-Bi eutectic alloy in saturated oxygen condition at 450 oC were carried out. After experiments, the thickness and compositional profile of the oxide layer on the specimen were analyzed using SEM and EDX. Analysis results show that the thickness of the oxide layer increases as the exposure time increases from 500 h to 1,000 h. The thickness of the oxide layer remains almost unchanged at 15 to 16 mm from 1,000 to 1,500 h. Formation of a thick and protective oxide layer at 450 oC prevents the penetration of liquid Pb-Bi eutectic alloy into the matrix of the T91 steel.
文摘As one of candidates for the fuel cladding or structure material used in fourth generation fission and fusiondemonstrate reactor, MAX phase has the properties of both ceramic and metal, such as high melting point, hightemperaturestability, good erosion resistance and radiation-damage tolerance[1;2]. Max phase is a series of ceramicsof nanolamellar and hexagonal structure. M represents transition element. A represents the third or fourth maingroup element. X represent N and C. In the design of lead-cooled fast reactor, it is required that the materialshould endure the corrosion of liquid Pb-Bi alloy. Therefore, understanding of the oxide layers and their growthmechanisms in LBE is fundamentally important for the development of candidate materials.
文摘In the Bi-Sr-Ca-Cu-O superconductor system, two superconducting phases (85K and 105K) were found by Maeda et al. By substituting Pb, enhanced superconducting properties and structure stabilization in these compounds have been reported. Recently, the
文摘以镉铅砷复合污染土壤为研究对象,将生物可降解络合剂谷氨酸二乙酸四钠[tetrasodium N, N-bis(carboxymethyl)glutamic acid, GLDA]应用于电动治理技术,同时结合投加方式和阴极pH值控制技术,以研究电动治理对土壤中不同重金属的同步去除效率并探讨其去除机制。结果显示:(1)GLDA明显提高了土壤溶液中重金属的质量浓度,有利于土壤重金属在电场作用下移出土体;(2)阳极投加GLDA有利于As的去除,土壤As总去除率可达60.7%,但土壤环境过碱时不利于Cd和Pb的移除;(3)阴极投加GLDA结合pH值控制处理中Cd和Pb的总去除率分别可达35.9%和23.7%,在所有处理中最高,且As的去除率(42.3%)也仅低于阳极投加GLDA处理,是一种较优的同步去除Cd、Pb和As的方法;(4)电动处理后土壤pH值和电导率依处理不同会发生较大变化,总体趋势为阳极附近土壤pH值低于阴极附近,且土壤电导率普遍升高。研究结果为GLDA在重金属复合污染土壤电动治理中的应用提供了理论基础和技术支持。
