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退火对原子层沉积W/Al2O3纳米薄膜形貌与电学性能的影响 认领 引用
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作者 高管哗 王国政 +1 位作者 蒋恩桐 王天昊 《物理化学进展》 2026年第2期110-121,共12页
在氮气气氛下对原子层沉积法制备的W/Al2O3薄膜进行了退火处理,利用高阻测试仪、扫描电子显微镜及能量色散X射线谱对薄膜进行表征,研究了退火对薄膜电学性能及形貌的影响。结果表明,在1 h退火时间下,400℃~600℃退火不仅使薄膜方块电阻... 在氮气气氛下对原子层沉积法制备的W/Al2O3薄膜进行了退火处理,利用高阻测试仪、扫描电子显微镜及能量色散X射线谱对薄膜进行表征,研究了退火对薄膜电学性能及形貌的影响。结果表明,在1 h退火时间下,400℃~600℃退火不仅使薄膜方块电阻数值明显降低,而且随退火温度升高呈持续下降趋势,当退火温度上升至700℃~800℃时,方块电阻偏离下降趋势,出现了明显上升趋势;当退火时间延长至2 h时,薄膜在400℃~500℃条件下仍保持下降趋势,但在600℃条件下方块电阻出现明显跃升。SEM与EDS结果表明,电学异常与薄膜表面连续性下降密切相关。 展开更多
关键词 原子层沉积 W/Al2O3纳米薄膜 退火 方块电阻 表面形貌
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石墨烯对光固化Al2O3陶瓷力学性能的影响 认领 引用
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作者 刘耀 余庆轩 +3 位作者 王中原 文蓉江 李澜波 占丽娜 《热加工工艺》 CAS 北大核心 2026年第13期75-82,共8页
针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含... 针对光固化Al2O3陶瓷在脱脂烧结后易形成孔洞、力学性能差的问题,系统研究了石墨烯添加对陶瓷浆料流变性、沉降性、固化行为及烧结体力学性能的影响。采用γ-缩水甘油醚氧丙基三甲氧基硅烷(KH560)对Al2O3粉体进行表面改性,并加入不同含量的石墨烯,制备高固相、低粘度的光固化浆料。通过傅里叶红外光谱、旋转流变仪、沉降试验及Beer-Lambert模型分析,优化了浆料配方与光固化工艺参数。结果表明:当KH560含量为2.5wt%、石墨烯含量为0.01wt%时,浆料粘度最低、沉降分层最少;在曝光时间4 s条件下,添加0.01wt%石墨烯的浆料透射深度为382μm,临界曝光能量为44.3 m J/cm2。经1750℃烧结后,陶瓷零件致密度达99.7%,弯曲强度为27.61 MPa,维氏硬度为13.45GPa。石墨烯通过位阻效应及裂纹偏转机制有效促进了烧结致密化并改善了力学性能。本研究为光固化增材制造高致密、高性能氧化铝陶瓷提供了试验依据。 展开更多
关键词 石墨烯 光固化 Al2O3陶瓷 浆料 流变性能
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釉中SiO2和Al2O3含量对青花瓷“晕散”的影响研究 认领 引用
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作者 李小龙 胡其国 +2 位作者 赵田贵 董伟霞 包启富 《中国陶瓷》 CAS CSCD 北大核心 2026年第7期79-88,共10页
青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光... 青花瓷作为中国传统文化的瑰宝,在制备烧造过程中,因青花色料、釉料配方组成以及制备工艺的影响,易造成青花装饰出现发色不均匀、线条或者块面在不同朝代或者是同一朝代有不同程度的“晕散”。实验采用场发射扫描电镜(FE-SEM)、傅里叶光谱(FTIR)、电子探针(EPMA)、光学显微镜(OM)等设备分析青花瓷釉中SiO2和Al2O3含量对青花装饰晕散距离、微观结构、釉层网络结构以及釉中Co2+浓度的影响,结合理论计算阐明了青花瓷“晕散”与釉料黏度之间的关系。实验结果表明,随着釉中SiO2和Al2O3含量的增加,釉层网络结构中Si—O—Si键数量增多并且增强,釉层黏度增大;黏流活化能拟合结果表明,黏流活化能增大,原子间作用力越强,Co2+在釉中扩散越困难,青花瓷线条的“晕散”距离从250μm减小到10μm。本研究有助于从物理化学角度理解青花“晕散”机制,为青花装饰工艺的优化提供科学依据。 展开更多
关键词 青花瓷 SiO2 Al 2O3 晕散 黏流活化能
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Tb3+离子掺杂的Al2O3基发光材料的微波水热合成与性能 认领 引用
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作者 程文俊 刘静 张俊计 《纳米技术》 2026年第2期17-25,共9页
以Al(NO3)3·9H2O和尿素为原料,采用微波水热–焙烧法制备了稀土离子Tb3+掺杂的Al2O3基发光材料。利用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、同步热分析仪(TG-DSC)、荧光光谱仪(FS)和Chromaticity Diagram等对产物的结构、形貌... 以Al(NO3)3·9H2O和尿素为原料,采用微波水热–焙烧法制备了稀土离子Tb3+掺杂的Al2O3基发光材料。利用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、同步热分析仪(TG-DSC)、荧光光谱仪(FS)和Chromaticity Diagram等对产物的结构、形貌、发光性能和CIE色度进行分析和表征。结果表明,在180℃下微波水热30 min,可制备出结晶良好的叶片状勃姆石。勃姆石经不同温度的焙烧,由γ-Al2O3向δ-Al2O3转变,焙烧后的样品形貌基本保留前驱体的形貌。掺杂Al2O3基发光材料的发光来自Tb3+的5D4→7Fj (j = 3, 4, 5, 6)能级跃迁发射,发光强度随焙烧温度的提高趋于增强,CIE色度随焙烧温度变化不明显,呈绿色。 展开更多
关键词 微波水热法 Al2O3基质 发光性能
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基于PI3K/Akt/FoxO1信号通路探讨参桂降糖方对2型糖尿病db/db小鼠糖脂代谢及其机制的影响 认领 引用
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作者 王再冉 朱怡霏 +3 位作者 汤佳禾 秦灵灵 吴丽丽 刘铜华 《中国实验方剂学杂志》 CAS CSCD 北大核心 2026年第9期42-51,共10页
目的:基于磷脂酰肌醇3-激酶(PI3K)/蛋白激酶B(Akt)/叉头框蛋白O1(FoxO1)信号通路,探讨参桂降糖方对自发性2型糖尿病(T2DM)模型db/db小鼠的胰岛素抵抗(IR)及其糖脂代谢的影响,通过基础性实验,为该方临床应用奠定理论支撑。方法:该研究采... 目的:基于磷脂酰肌醇3-激酶(PI3K)/蛋白激酶B(Akt)/叉头框蛋白O1(FoxO1)信号通路,探讨参桂降糖方对自发性2型糖尿病(T2DM)模型db/db小鼠的胰岛素抵抗(IR)及其糖脂代谢的影响,通过基础性实验,为该方临床应用奠定理论支撑。方法:该研究采用随机对照设计,以30只符合纳入标准(空腹血糖>7.0 mmol·L-1且非同日随机血糖≥11.1 mmol·L-1)的自发性T2DM db/db小鼠为研究对象,按体质量、血糖进行区组分层后,将其随机分至模型组、二甲双胍组、参桂降糖方组,每组n=10,并将10只db/m小鼠为正常组,在为期5周的干预中,每周记录小鼠一般指标(包括一般状况、空腹血糖、体质量及进食量),并于第5周行口服葡萄糖耐量试验(OGTT)。5周后采集血清以检测糖脂代谢数据;对肝脏组织则进行分析:通过苏木素-伊红(HE)染色、过碘酸雪夫(PAS)和油红O染色观察组织病理学,通过蛋白质免疫印迹法(Western blot)与实时荧光定量聚合酶链式反应(Real-time PCR),定量分析PI3K/Akt/FoxO1信号通路相关蛋白与mRNA的表达。结果:一般情况观察:正常组小鼠整体状况健康,反应敏捷,皮毛顺滑且光泽,与正常组比较,模型组小鼠出现典型的多饮、多食、多尿症状,精神萎靡,皮毛粗糙,且进食量、初始体质量、肝质量及肝脏指数均显著升高(P<0.01),药物干预5周后,参桂降糖方组与二甲双胍组均未显著影响模型小鼠的进食量。与模型组比较,参桂降糖方组的肝质量及肝脏指数差异无统计学意义。血清生化指标检测:与正常组比较,模型组的空腹血糖、空腹胰岛素、IR指数、糖化血清蛋白及血脂水平均显著升高;药物干预后,与模型组比较,参桂降糖方组能显著降低模型小鼠的空腹血糖(P<0.01),OGTT各时间点均低于模型组,其中0 min血糖及血糖曲线下面积与模型组比较差异有统计学意义(P<0.05),且能明显降低空腹胰岛素水平、IR指数及糖化血清蛋白水平(P<0.05),对血脂、肝酶(天门冬氨酸氨基转移酶、丙氨酸氨基转移酶)、尿素氮水平有降低趋势,对肌酐水平有上升趋势,但差异无统计学意义。肝脏组织形态学检查:HE染色表明参桂降糖方可以改善糖尿病小鼠肝细胞的形态结构,减缓脂肪变性;肝脏PAS染色表明可以增加糖尿病小鼠肝糖原含量,促进肝脏糖原的合成;油红O染色表明可以减轻肝细胞内脂肪沉积。Western blot:与正常组比较,模型组PI3K、Akt、磷酸化(p)-Akt、p-FoxO1蛋白表达下降,FoxO1蛋白表达升高;与模型组比较,二甲双胍组、参桂降糖方组PI3K、Akt、p-Akt、p-FoxO1蛋白表达升高,FoxO1蛋白表达下降。Real-time PCR:PI3K、Akt、FoxO1 mRNA表达明显下调(P<0.05)。结论:参桂降糖方能改善db/db小鼠的IR及糖脂代谢紊乱;参桂降糖方能够改善db/db小鼠肝脏脂肪变性,促进肝糖原合成,减少脂质沉积;参桂降糖方改善IR的机制可能与PI3K/Akt/FoxO1信号通路有关。 展开更多
关键词 参桂降糖方 2型糖尿病(T2DM) 糖脂代谢 胰岛素抵抗(IR) 磷脂酰肌醇3-激酶/蛋白激酶B/叉头框蛋白O1(PI3K/Akt/FoxO1)信号通路
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Al2O3coated polyimide porous films enable thin yet strong polymer-in-salt solid-state electrolytes for dendrite-free lithium metal batteries 认领 引用
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作者 Haotian Zhang Shengfa Feng +6 位作者 Mufan Cao Xiong Xiong Liu Pengcheng Yuan Yaping Wang Min Gao Long Pan Zhengming Sun 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第8期492-497,共6页
The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength,ionic conductivity,and thickness.Here,we propose Al2O3-coated polyimide(AO/PI)porous film as ... The ineluctable introduction of lithium salt to polymer solid-state electrolytes incurs a compromise between strength,ionic conductivity,and thickness.Here,we propose Al2O3-coated polyimide(AO/PI)porous film as a high-strength substrate to support fast-ion-conducting polymer-in-salt(PIS)solid-state electrolytes,aiming to suppress lithium dendrite growth and improve full-cell performance.The Al2O3coating layer not only refines the wettability of polyimide porous film to PIS,but also performs as a high modulus protective layer to suppress the growth of lithium dendrites.The resulting PI/AO@PIS exhibits a small thickness of only 35μm with an outstanding tensile strength of 11.3 MPa and Young's modulus of 537.6 MPa.In addition,the PI/AO@PIS delivers a high ionic conductivity of 0.1 m S/cm at 25°C.As a result,the PI/AO@PIS enables symmetric Li cells to achieve exceptional cyclability for over 1000 h at 0.1 m A/cm2without noticeable lithium dendrite formation.Moreover,the PI/AO@PIS-based LiFePO4||Li full cells demonstrate outstanding rate performance(125.7 m Ah/g at 5 C)and impressive cycling stability(96.1%capacity retention at 1 C after 200 cycles).This work highlights the efficacy of enhancing the mechanical properties of polymer matrices and extending cell performance through the incorporation of a dense inorganic interface layer. 展开更多
关键词 Polymer-in-salt solid-state electrolytes Inorganic interface layer Al2O3interfaciAl layer Li dendrites Cycling performance
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Effects of Li2O on the thermodynamic properties of LiCl-UCl3molten salt:A first-principles molecular dynamics study 认领 引用
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作者 Wentao Zhou Lve Lin +3 位作者 Yuan Yin Jia Song Xinyu Zhang Yafei Wang 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2025年第12期133-141,共9页
Electrolytic reduction is a crucial process during the pyroprocessing of oxide spent fuel.This paper investigates the effects of different concentrations of Li2O on the properties of the LiCl-UCl3-Li2O mol... Electrolytic reduction is a crucial process during the pyroprocessing of oxide spent fuel.This paper investigates the effects of different concentrations of Li2O on the properties of the LiCl-UCl3-Li2O molten salt system during electrolytic reduction using first-principles molecular dynamics simulations.The study reveals that increasing Li2O concentration lowers the ion diffusion coefficients of Li+,Cl-,and O2-in the electrolyte,which has negative effect on the transport property of the system.A thorough analysis of the ligand structures formed by various components in the molten salt was conducted,including radial distribution functions and angular distribution functions.The analysis reveals that oxygen ions compete with chloride ions for coordination with cations.This competitive interaction has a significant impact on the coordination between Li-Cl and U-Cl elements,thereby influencing the microstructure.The analysis of electronic structures shows that the addition of Li2O affects the charge transfer among lithium,uranium,and chlorine,impacting the bond strength between anions and cations.Finally,the calculation of redox potential shows that an appropriate concentration of Li2O is beneficial to the electrochemical reduction process.The research results provide a theoretical basis for the design of molten salts in the electrolytic reduction process. 展开更多
关键词 First-principle Molecular dynamics LiCl-UCl3-Li2O Electrolytic reduction
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Treatment of phenol wastewater by microwave-induced CIO2-CuO_x/Al_2O3 catalytic oxidation process 认领 引用 被引量：30
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作者 BI Xiao-yi WANG Peng +3 位作者 JIANG Hong XU Huan-yan SHI Shu-jie HUANG Jun-li 《Journal of Environmental Sciences》 SCIE EI CAS 2007年第12期1510-1515,共6页
The catalyst of CUOx/Al2O3 was prepared by the dipping-sedimentation method using y-Al2O3 as a supporter.CuO and Cu2O were loaded on the surface of Al2O3,characterized by X-ray diffraction(XRD)and X-ray photoelectron ... The catalyst of CUOx/Al2O3 was prepared by the dipping-sedimentation method using y-Al2O3 as a supporter.CuO and Cu2O were loaded on the surface of Al2O3,characterized by X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS).In the presence of CuOx/Al2O3,the microwave-induced chlorine dioxide(ClO2)catalytic oxidation process was conducted for the treatment of synthetic wastewater containing 100 mg/L phenol.The factors influencing phenol removal were investigated and the results showed that microwave-induced C102-CuOx/ml203 process could effectively degrade contaminants in a short reaction time with a low oxidant dosage,extensive pH range.Under a given condition(ClO2 concentration 80 mg/L,microwave power 50 W,contact time 5 latin,catalyst dosage 50 g/L,pH 9),phenol removal percentage approached 92.24%,corresponding to 79.13%of CODcr removal.The removal of phenol by microwave-induced ClO2-CuOx/Al2O3 catalytic oxidation process was a complicated non-homogeneous solid/water reaction,which fitted pseudo-first-order by kinetics.Compared with traditional ClO2 oxidation,ClO2 catalytic oxidation and microwave-induced ClO2 oxidation,microwave-induced ClO2 catalytic oxidation system could significantly enhance the degradation efficiency.It provides an effective technology for the removal of phenol wastewater. 展开更多
关键词 microwave-induced oxidation ClO2 CuOx/Al2O3 phenol wastewater
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Improving the denitration performance and K-poisoning resistance of the V_2O_5-WO_3/TiO_2 catalyst by Ce4+ and Zr4+ co-doping 认领 引用 被引量：22
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作者 Jun Cao Xiaojiang Yao +4 位作者 Fumo Yang Li Chen Min Fu Changjin Tang Lin Dong 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2019年第1期95-104,共10页
A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐W... A series of V2O5‐WO3/TiO2‐ZrO2,V2O5‐WO3/TiO2‐CeO2,and V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalysts were synthesized to improve the selective catalytic reduction(SCR)performance and the K‐poisoning resistance of a V2O5‐WO3/TiO2 catalyst.The physicochemical properties were investigated by using XRD,BET,NH3‐TPD,H2‐TPR,and XPS,and the catalytic performance and K‐poisoning resistance were evaluated via a NH3‐SCR model reaction.Ce^4+and Zr^4+co‐doping were found to enhance the conversion of NOx,and exhibit the best K‐poisoning resistance owing to the largest BET‐specific surface area,pore volume,and total acid site concentration,as well as the minimal effects on the surface acidity and redox ability from K poisoning.The V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst also presents outstanding H2O+SO2 tolerance.Finally,the in situ DRIFTS reveals that the NH3‐SCR reaction over the V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst follows an L‐H mechanism,and that K poisoning does not change the reaction mechanism. 展开更多
关键词 V2O5‐WO3/TiO2‐CeO2‐ZrO2 catalyst Co‐doping K‐poisoning NH3‐SCR Reaction mechanism
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Effect of Ce doping into V2O5-WO3/TiO2 catalysts on the selective catalytic reduction of NOx by NH3 认领 引用 被引量：27
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作者 Mengyin Chen Mengmeng Zhao +3 位作者 Fushun Tang Le Ruan Hongbin Yang Ning Li 《Journal of Rare Earths》 SCIE EI CAS CSCD 2017年第12期1206-1215,共10页
In this work, the effectiveness of V2O5-WO3/TiO2 catalysts modified with different CeO2 contents by impregnation and co-precipitation methods on the selective catalytic reduction of NOxby NH3 have been studied compara... In this work, the effectiveness of V2O5-WO3/TiO2 catalysts modified with different CeO2 contents by impregnation and co-precipitation methods on the selective catalytic reduction of NOxby NH3 have been studied comparatively by various experimental techniques. The results showed that the NO conversion of V2O5-WO3/CeO2-TiO2 catalysts modified by co-precipitation method obviously increased with the Ce doping contents in the studied range below 20%（All Ce contents are in mass fractions）, but the NO conversion of V2O5-WO3/CeO2/TiO2 catalysts modified by impregnation methods was lower than V2O5-WO3/CeO2-TiO2 catalysts especially beyond 2.5% Ce doping contents. The V2O5-WO3/CeO2-TiO2 catalysts showed better SCR activity, wider reaction window, and higher sulfur and water resistance. The characterization results elucidated that the modified catalysts by co-precipitation method exhibited higher specific surface area, much better dispersity of Ce component, more Ce^（3＋）species and more Br？nsted acid sites than that by impregnation. The vacancies caused by more Ce^（3＋）species were favorable for more NO oxidation to NO2, and the interaction between Ce species and WOxspecies generated more Br？nsted acid sites. It could be supposed that dispersed Ce Oxspecies and WOxspecies offered more second active centers respectively to adsorb oxygen and activate ammonia as co-catalysis to the primary active center of V ions, thus facilitated the better SCR activity of modified V2O5-WO3/CeO2-TiO2 catalysts by coprecipitation methods. The co-precipitation methods with Ce component were more suitable for production of modified commercial V2O5-WO3/TiO2 catalysts. 展开更多
关键词 V2O5-WO3/TiO2 catalysts Ce doping methods NH3 selective catalytic reduction NOx Dispersion state Reducibility Br?nsted acid sites
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Effects of Ce on catalytic combustion of methane over Pd-Pt/Al_2O_3 catalyst 认领 引用 被引量：18
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作者 Xing Fan Fan Wang +1 位作者 Tianle Zhu Hong He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2012年第3期507-511,共5页
Activity and stability of 1%Pd-0.2%Pt/Al2O3 and 1%Pd-0.2%Pt/0.6%Ce/Al2O3 catalysts prepared by impregnation method for catalytic combustion of methane in air were investigated. The catalysts before and after reaction ... Activity and stability of 1%Pd-0.2%Pt/Al2O3 and 1%Pd-0.2%Pt/0.6%Ce/Al2O3 catalysts prepared by impregnation method for catalytic combustion of methane in air were investigated. The catalysts before and after reaction were characterized by BET, CO chemisorption, XRD and XPS techniques. Results showed that the presence of Ce significantly increased the activity and thermal stability of the Pd-Pt/Al2O3 catalyst towards methane combustion, which could be attributed to more highly-dispersed active PdO particles over the Pd-Pt/Ce/Al2O3 catalyst surface as well as the retarded sintering of PdO and the maintained oxidized state of surface Pd during the combustion process in the presence of Ce. 展开更多
关键词 catalytic combustion methane Pd-Pt/Ce/Al2O3 catalyst stability metal dispersion
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Investigation of the characteristics and deactivation of catalytic active center of Cr-Al_2O_3 catalysts for isobutane dehydrogenation 认领 引用 被引量：11
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作者 Deren Fang Jinbo Zhao +4 位作者 Wanjun Li Xu Fang Xin Yang Wanzhong Ren Huimin Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2015年第1期101-107,共7页
Deactivation mechanism of Cr-Al2O3catalyst and the interaction of Cr-A1 in the dehydrogenation of isobutane, as well as the nature of the catalytic active center, were studied using XRD, SEM, XPS, H2-TPR, isobutane-TP... Deactivation mechanism of Cr-Al2O3catalyst and the interaction of Cr-A1 in the dehydrogenation of isobutane, as well as the nature of the catalytic active center, were studied using XRD, SEM, XPS, H2-TPR, isobutane-TPR and TPO techniques. The results revealed that the deactivation of Cr-Al2O3 catalyst was mainly caused by carbon deposition on its surface. The Cr3＋ ion could not be reduced by hydrogen but could be reduced to Cr2＋ by hydrocarbons and monoxide carbon. The active center for isobutane dehydrogenation could be Cr2＋/Cr3＋ produced from Cr6＋ by the on line reduction of hydrocarbon and carbon monoxide. The binding energy of Al3＋ was strongly affected by the state of chromium cations in the catalysts. 展开更多
关键词 isobutane dehydrogenation Cr/Al2O3 deactivation active center catalyst
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Characterization and Thermodynamics of Al_2O_3-MnO-SiO_2(-MnS)Inclusion Formation in Carbon Steel Billet 认领 引用 被引量：8
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作者 Guo-cheng WANG Sheng-li LI +2 位作者 Xin-gang AI Chong-min ZHANG Chao-bin LAI 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2015年第7期566-572,共7页
A method to extract inclusion particles from solid steel by electrolysis with organic electrolyte solution was introduced; meanwhile, thermodynamics of inclusion formation was calculated using FaetSage software. The r... A method to extract inclusion particles from solid steel by electrolysis with organic electrolyte solution was introduced; meanwhile, thermodynamics of inclusion formation was calculated using FaetSage software. The results showed that there were two kinds of inclusions in the billet, i.e. Al2O3-MnO-SiO2-MnS （AMS-MnS） and Al2O3- MnO-SiO2 （AMS）. Most of AMS-MnS inclusion particles, with diameter of 10--30 μm, showed three-layer structures： SiO2-rich core with a small quantity of Mn, intermediate AMS layer, and MnS outer layer containing small quanti- ties of A1 and O. Most AMS inclusion particles were 50--90 μm and exhibited homogeneous composition. Thermo- dynamic results indicated that SiO2-rich core could form firstly by Si reacting with O in molten steel at temperatures above 1 923 K during Si-Fe alloy addition, and then, the SiO2-rich core could react with Mn and Al to form liquid AMS enveloping the SiO2 rich core at 1823- 1873 K. MnS began to precipitate from AMS when temperature reached 1 728 K. Liquid AMS could form by coupled reaction among Si, Mn, Al and O in molten steel. 展开更多
关键词 Al2 O3-MnO-SiO2 MnS extraction organic electrolyte solution thermodynamics
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复相陶瓷涂层Al-TiO_2-B_2O_3体系热力学与动力学分析 认领 引用 被引量：12
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作者 马壮 集兴伟 +2 位作者 林鹏 董世知 李智超 《硅酸盐通报》 CAS 北大核心 2010年第3期582-587,共6页
采用Al-TiO2-B2O3反应体系并利用机械合金化(MA)原位合成Al2O3-TiB2复合相,对Al-TiO2-B2O3反应体系标准反应吉布斯自由能(ΔGT)进行计算,并应用Starink法计算其反应活化能,计算结果表明:Al2O3和TiB2的生成可能性较大,XRD分析的结果也证... 采用Al-TiO2-B2O3反应体系并利用机械合金化(MA)原位合成Al2O3-TiB2复合相,对Al-TiO2-B2O3反应体系标准反应吉布斯自由能(ΔGT)进行计算,并应用Starink法计算其反应活化能,计算结果表明:Al2O3和TiB2的生成可能性较大,XRD分析的结果也证实了这一点;利用差示扫描量热分析(DSC)对反应体系进行了研究,分析了Al2O3-TiB2复合相的生成过程;MA5h后粉体的Ea为361.35kJ·mol-1,MA20h后粉体的Ea为188.35kJ.mol-1。 展开更多
关键词 陶瓷涂层 Al2O3-TiB2复合相 MA 热力学 动力学
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Visible light-enhanced photothermal CO2 hydrogenation over Pt/Al2O3 catalyst 认领 引用 被引量：7
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作者 Ziyan Zhao Dmitry EDoronkin +3 位作者 Yinghao Ye Jan-Dierk Grunwaldt Zeai Huang Ying Zhou 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2020年第2期286-293,共8页
Light illumination has been widely used to promote activity and selectivity of traditional thermal catalysts. Nevertheless, the role of light irradiation during catalytic reactions is not well understood. In this work... Light illumination has been widely used to promote activity and selectivity of traditional thermal catalysts. Nevertheless, the role of light irradiation during catalytic reactions is not well understood. In this work, Pt/Al2 O3 prepared by wet impregnation was used for photothermal CO2 hydrogenation, and it showed a photothermal effect. Hence, operando diffuse reflectance infrared Fourier-transform spectroscopy and density functional theory calculations were conducted on Pt/Al2 O3 to gain insights into the reaction mechanism. The results indicated that CO desorption from Pt sites including step sites(Ptstep) or/and terrace site(Ptterrace) is an important step during CO2 hydrogenation to free the active Pt sites. Notably, visible light illumination and temperature affected the CO desorption in different ways. The calculated adsorption energy of CO on Ptstep and Ptterrace sites was-1.24 and-1.43 e V, respectively. Hence, CO is more strongly bound to the Ptstep sites. During heating in the dark, CO preferentially desorbs from the Ptterrace site. However, the additional light irradiation facilitates transfer of CO from the Ptstep to Ptterrace sites and its subsequent desorption from the Ptterrace sites, thus promoting the CO2 hydrogenation. 展开更多
关键词 CO2 hydrogenation Photothermal catalysis Pt/Al2O3 Operando diffuse reflectance infrared Fourier transform spectroscopy Density functional theory
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Effects of MgO/Al2O3 ratio on viscous behaviors and structures of MgO-Al2O3-TiO2-CaO-SiO2 slag systems with high TiO2 content and low CaO/SiO2 ratio 认领 引用 被引量：11
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作者 Cong FENG Li-hua GAO +2 位作者 Jue TANG Zheng-gen LIU Man-sheng CHU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2020年第3期800-811,共12页
The effects of MgO/Al2 O3 ratio on the viscous behaviors of MgO-Al2 O3-TiO2-CaO-SiO2 systems were investigated by the rotating cylinder method.Raman spectroscopy was used to analyze the structural characteristics of s... The effects of MgO/Al2 O3 ratio on the viscous behaviors of MgO-Al2 O3-TiO2-CaO-SiO2 systems were investigated by the rotating cylinder method.Raman spectroscopy was used to analyze the structural characteristics of slag and Factsage 7.0 was adopted to demonstrate the liquidus temperature of slag.The results show that the viscosity and activation energy for viscous flow decrease when the MgO/Al2O3 ratio increases from 0.82 to 1.36.The break point temperature and liquidus temperature of slag initially decrease and subsequently increase.The complex viscous structures are gradually depolymerized to simple structural units.In conclusion,with the increase of MgO/Al2O3 ratio,the degree of polymerization of slag decreases,which improves the fluidity of slag.The variations of liquidus temperature of slag lead to the same changes of break point temperature. 展开更多
关键词 vanadium-bearing titanomagnetite titanium-bearing slag viscous behavior degree of polymerization of slag MgO/Al2O3 ratio
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Fabrication of Ce-doped(Gd2Y)Al5O12/Y3Al5O12 composite-phase scintillation ceramic 认领 引用 被引量：6
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作者 Shuilin Chen Benxue Jiang +5 位作者 Yang Wang Qiangqiang Zhu Qinghua Yang Wanqiu Ma Ge Zhang Long Zhang 《Journal of Rare Earths》 SCIE EI CAS CSCD 2019年第9期978-983,I0003,共6页
In this paper,a novel Ce(Gd2 Y)Al5O12/Ce:Y3Al5O12(Ce:GYAG/Ce:YAG)composite scintillation ceramic was designed and fabricated by a solid-state reaction method.The phase,luminescence and scintillation properties were in... In this paper,a novel Ce(Gd2 Y)Al5O12/Ce:Y3Al5O12(Ce:GYAG/Ce:YAG)composite scintillation ceramic was designed and fabricated by a solid-state reaction method.The phase,luminescence and scintillation properties were investigated.The Ce:GYAG/Ce:YAG composite ceramic consisting of two-phase has a broad emission band ranging from 500 to 750 nm.The total mass attenuation coefficient of Ce:GYAG/Ce:YAG is 0.3864 cm^-1,in between those of Ce:YAG and Ce:GYAG ceramics.In addition,the composite ceramic had a high light yield of 20430 ph/MeV.By controlling the ratio of GYAG and YAG,the composite ceramic can realize a spectrum design and total mass attenuation coefficient control to meet the requirements for wide-X-ray-energy-range detectors. 展开更多
关键词 Ce:(Gd2Y)Al5O12/Ce:Y3Al5O12 composite ceramic Spectrum control X-ray energy Rare earths
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Effect of CaO/Al2O3 ratio on viscosity and structure of CaO-Al2O3-based fluoride-free mould fluxes 认领 引用 被引量：4
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作者 Qi Wang Ji-an Yang +3 位作者 Chen Zhang De-xiang Cai Jian-qiang Zhang Oleg Ostrovski 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2019年第4期374-384,共11页
The effects of CaO/Al2O3 ratio on viscosity and structure of the CaO-Al2O3-based fluoride-free mould fluxes were investigated with the CaO/Al2O3 ratio varied from 1 to 4 and the content of SiO2 fixed at 7 wt.%. The in... The effects of CaO/Al2O3 ratio on viscosity and structure of the CaO-Al2O3-based fluoride-free mould fluxes were investigated with the CaO/Al2O3 ratio varied from 1 to 4 and the content of SiO2 fixed at 7 wt.%. The increase in the CaO/Al2O3 ratio from 1 to 2 lowered the viscosity of the flux melts. The viscosity increased slightly with the CaO/Al2O3 ratio from 2 to 3, and this increase became significant with further increasing CaO/Al2O3 ratio to 4. Both break temperature and apparent activation energy were found to be increased with the increase in CaO/Al2O3 ratio from 2 to 4. There was no break temperature available in the flux with CaO/Al2O3 ratio of 1. Changing the CaO/Al2O3 ratio from 1 to 2 decreased the apparent activation energy. Equilibrium phases of the fluxes were calculated using FactSage 7.1 and the major phases were found to be varied with the CaO/Al2O3 ratio. Structures of tested mould fluxes were analysed using Fourier transform infrared spectroscopy. The results showed that the increase in the CaO/Al2O3 ratio from 1 to 2 decreased the complexity of the structure, leading to a reduced viscosity. With the increase in the CaO/Al2O3 ratio from 2 to 4, both solid phase precipitation and melt structure contributed to the variation of viscosity. 展开更多
关键词 CaO-Al2O3-based flux CaO/Al2O3 ratio Viscosity Flux structure
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Local structural evolutions of CuO/ZnO/Al2O3 catalyst for methanol synthesis under operando conditions studied by in situ quick X-ray absorption spectroscopy 认领 引用 被引量：5
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作者 Xue-Ping Sun Fan-Fei Sun +5 位作者 Song-Qi Gu Jing Chen Xian-Long Du Jian-Qiang Wang Yu-Ying Huang Zheng Jiang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2017年第2期35-43,共9页
In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for met... In situ quick X-ray absorption spectroscopy(QXAFS) at the Cu and Zn K-edge under operando conditions has been used to unravel the Cu/Zn interaction and identify possible active site of CuO/ZnO/Al_2O_3 catalyst for methanol synthesis. In this work, the catalyst, whose activity increases with the reaction temperature and pressure, was studied at calcined, reduced, and reacted conditions. TEM and EDX images for the calcined and reduced catalysts showed that copper was distributed uniformly at both conditions. TPR profile revealed two reduction peaks at 165 and 195 °C for copper species in the calcined catalyst. QXAFS results demonstrated that the calcined form consisted mainly of a mixed Cu O and Zn O, and it was progressively transformed into Cu metal particles and dispersed Zn O species as the reduction treatment. It was demonstrated that activation of the catalyst precursor occurred via a Cu^+intermediate, and the active catalyst predominantly consisted of metallic Cu and Zn O evenunder higher pressures. Structure of the active catalyst did not change with the temperature or pressure, indicating that the role of the Zn was mainly to improve Cu dispersion.This indicates the potential of QXAFS method in studying the structure evolutions of catalysts in methanol synthesis. 展开更多
关键词 In situ Quick X-ray absorption spectroscopy CuO/ZnO/Al2O3 catalyst Operando condition
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A study on Al_2O_3 passivation in GaN MOS-HEMT by pulsed stress 认领 引用 被引量：8
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作者 岳远征 郝跃 +3 位作者 张进城 冯倩 倪金玉 马晓华 《Chinese Physics B》 SCIE EI CAS 2008年第4期1405-1409,共5页
This paper studies systematically the drain current collapse in AlGaN/GaN metal-oxide-semiconductor high electron mobility transistors （MOS-HEMTs） by applying pulsed stress to the device. Low-temperature layer of Al... This paper studies systematically the drain current collapse in AlGaN/GaN metal-oxide-semiconductor high electron mobility transistors （MOS-HEMTs） by applying pulsed stress to the device. Low-temperature layer of Al2O3 ultrathin film used as both gate dielectric and surface passivation layer was deposited by atomic layer deposition （ALD）. For HEMT, gate turn-on pulses induced large current collapse. However, for MOS-HEMT, no significant current collapse was found in the gate turn-on pulsing mode with different pulse widths, indicating the good passivation effect of ALD Al2O3. A small increase in Id in the drain pulsing mode is due to the relieving of self-heating effect. The comparison of synchronously dynamic pulsed Id - Vds characteristics of HEMT and MOS-HEMT further demonstrated the good passivation effect of ALD Al2O3. 展开更多
关键词 AlGaN/GaN MOS-HEMT Al2O3 passivation
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