Passivated niobium/nitrogen(Nb-N) p-n co-doped zinc oxide nanoparticles were created by a simple precipitation process with in-situ self-formed NaCl "cage" to confine the nanoparticle growth followed by the ...Passivated niobium/nitrogen(Nb-N) p-n co-doped zinc oxide nanoparticles were created by a simple precipitation process with in-situ self-formed NaCl "cage" to confine the nanoparticle growth followed by the heat treatment in a flow of ammonia gas. Enhanced optical absorbance into the visible light region was observed in the Nb/N co-doped ZnO nanoparticle photocatalyst due to the Nb/N co-doping effect.It demonstrated a largely enhanced photocatalytic performance in the disinfection of Escherichia coli bacteria under visible light illumination, which could be attributed to the passivated co-doping of NbN to suppress the photogenerated charge carrier recombination on dopants. This robust approach for passivated p-n co-doping may also be applied to other material systems for a wide range of technical applications.展开更多
针对油缸用无缝钢管的服役条件等,运用Nb微合金化设计了E355+N的化学成分和“150tKR→150tBOF→150tLF→150tRH→CC(Φ310 mm)→管坯加热→穿孔→轧管→定径(Φ194×19 mm)→冷却→正火→矫直→探伤→检验→包装”的无缝钢管生产工...针对油缸用无缝钢管的服役条件等,运用Nb微合金化设计了E355+N的化学成分和“150tKR→150tBOF→150tLF→150tRH→CC(Φ310 mm)→管坯加热→穿孔→轧管→定径(Φ194×19 mm)→冷却→正火→矫直→探伤→检验→包装”的无缝钢管生产工艺路线。通过生产试制成功研发了Nb微合金化E355+N油缸用管,结果表明:含0.03%Nb的E355+N(欧标非合金结构钢)热轧后经900~920℃正火,与不含Nb正火的Q345D(国标低合金高强度钢)比较其平均伸长率提高了约13%,-20℃冲击性能平均值提高约10%,并且其冲击性能更加稳定。试制的无缝钢管化学成分均匀、有害杂质元素少、钢纯净度高,钢管的晶粒细小、组织均匀,客户后续刮削滚压(SRB:Scraping and Rolling Processing)加工后无“白斑”等缺陷,具有较好的加工性能。制造的油缸用产品质量稳定,实现批量供应,成功替代进口。展开更多
简述了微合金钢中微量元素 Nb 的主要作用,回顾了应变诱导析出的研究方法及优缺点,阐明了变形奥氏体应变诱导析出相的种类,晶体结构,析出相的形成顺序、形貌和分布,分析了影响析出动力学的主要因素并简要介绍了应变诱导析出动力学模型...简述了微合金钢中微量元素 Nb 的主要作用,回顾了应变诱导析出的研究方法及优缺点,阐明了变形奥氏体应变诱导析出相的种类,晶体结构,析出相的形成顺序、形貌和分布,分析了影响析出动力学的主要因素并简要介绍了应变诱导析出动力学模型的最新发展。展开更多
对经1 055 ℃正火和765 ℃回火优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管,进行室温和 566 ℃的静力强塑性的检测和评估,就取样位置和取样方向对强塑性的影响进行了 t统计检验评估及强塑性的标准偏差评估。结果表明,按优化工艺生产的9Cr...对经1 055 ℃正火和765 ℃回火优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管,进行室温和 566 ℃的静力强塑性的检测和评估,就取样位置和取样方向对强塑性的影响进行了 t统计检验评估及强塑性的标准偏差评估。结果表明,按优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管显著优于1 050 ℃正火和790 ℃回火原工艺生产的厚壁无缝钢管,强塑性指标及其标准偏差已达到进口P91厚壁无缝钢管的水平,表明我国9Cr 1Mo V Nb N厚壁无缝钢管的制造技术已日趋成熟。展开更多
对9Cr 1Mo V Nb N钢厚壁无缝管研制品与进口住友P91钢管在供货状态下进行了比较研究,测试了两者的静力拉伸强塑性,分析了其间存在的差异.结果表明,研制品的强塑性与进口管相差尚少,但钢中杂质元素的控制与住友钢管有一定差距,质量均... 对9Cr 1Mo V Nb N钢厚壁无缝管研制品与进口住友P91钢管在供货状态下进行了比较研究,测试了两者的静力拉伸强塑性,分析了其间存在的差异.结果表明,研制品的强塑性与进口管相差尚少,但钢中杂质元素的控制与住友钢管有一定差距,质量均匀性有待提高.展开更多
基金supported financially by the Basic Science Innovation Program of Shenyang National Laboratory for Materials Science (Nos.Y4N56R1161 and Y5N56F2161)the National Key Research and Development Program of China (No.2017YFB0406300)+2 种基金the Science and Technology Plan of Guangdong Province (Nos.2014B090907002 and 2017B090907004)the China Postdoctoral Science Foundation (No.2018M631461)the Science and Technology Plan of Shenzhen City (No.JCYJ20170412171554022)
文摘Passivated niobium/nitrogen(Nb-N) p-n co-doped zinc oxide nanoparticles were created by a simple precipitation process with in-situ self-formed NaCl "cage" to confine the nanoparticle growth followed by the heat treatment in a flow of ammonia gas. Enhanced optical absorbance into the visible light region was observed in the Nb/N co-doped ZnO nanoparticle photocatalyst due to the Nb/N co-doping effect.It demonstrated a largely enhanced photocatalytic performance in the disinfection of Escherichia coli bacteria under visible light illumination, which could be attributed to the passivated co-doping of NbN to suppress the photogenerated charge carrier recombination on dopants. This robust approach for passivated p-n co-doping may also be applied to other material systems for a wide range of technical applications.
文摘针对油缸用无缝钢管的服役条件等,运用Nb微合金化设计了E355+N的化学成分和“150tKR→150tBOF→150tLF→150tRH→CC(Φ310 mm)→管坯加热→穿孔→轧管→定径(Φ194×19 mm)→冷却→正火→矫直→探伤→检验→包装”的无缝钢管生产工艺路线。通过生产试制成功研发了Nb微合金化E355+N油缸用管,结果表明:含0.03%Nb的E355+N(欧标非合金结构钢)热轧后经900~920℃正火,与不含Nb正火的Q345D(国标低合金高强度钢)比较其平均伸长率提高了约13%,-20℃冲击性能平均值提高约10%,并且其冲击性能更加稳定。试制的无缝钢管化学成分均匀、有害杂质元素少、钢纯净度高,钢管的晶粒细小、组织均匀,客户后续刮削滚压(SRB:Scraping and Rolling Processing)加工后无“白斑”等缺陷,具有较好的加工性能。制造的油缸用产品质量稳定,实现批量供应,成功替代进口。
文摘对经1 055 ℃正火和765 ℃回火优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管,进行室温和 566 ℃的静力强塑性的检测和评估,就取样位置和取样方向对强塑性的影响进行了 t统计检验评估及强塑性的标准偏差评估。结果表明,按优化工艺生产的9Cr 1Mo V Nb N厚壁无缝钢管显著优于1 050 ℃正火和790 ℃回火原工艺生产的厚壁无缝钢管,强塑性指标及其标准偏差已达到进口P91厚壁无缝钢管的水平,表明我国9Cr 1Mo V Nb N厚壁无缝钢管的制造技术已日趋成熟。
