检索结果-南通市图书馆

Consolidation and Microstructures of Microwave Sintered W-25Cu Alloys with fe addition

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2010年第3期25卷 437-443页

作者：罗述东易健宏 State Key Laboratory for Powder Metallurgy Central South University

W-25Cu alloys were microwave sintered in a 2.45 GHz multimode *** densification,microstructure and their dependence on sintering mode and fe addition were investigated in *** to the volumetric heating intrinsic in microwave processing,a microstructure with larger W grain size in center regions was observed as against larger grain size in edge regions for conventional *** sintering demonstrates its intrinsic advantages such as rapid heating rate,densification enhancement and microstructural homogeneity;but it undesirably promotes W grain *** microwave sintering,the role of fe addition on compact consolidation is not so substantial as under conventional *** fe degrades the microstructural quality,generating worse uniformity and coarser W grains.

关键词： W-Cu alloy microwave sintering consolidation microstructure fe addition

Effect of fe addition on Dehydrogenation Performance of Methylcyclohexance over Pt/Al_(2)O_(3)

在线全文

学校读者我要写书评

暂无评论

China Petroleum Processing & Petrochemical Technology 2024年第1期26卷 12-18页

作者： Tong fengya Tian Hao Wang Hao Miao Changxi Song Lei Shanghai Research Institute of Petrochemical Technology SINOPEC Shanghai201208

Catalysts with varying fe contents were prepared using a sequential impregnation method to investigate the effects of fe addition on the physicochemical properties of Pt/Al_(2)O_(3) and their performance in methylcyclohexane(MCH)*** results demonstrated that the addition of fe to Pt/Al_(2)O_(3) enhanced the electron density of Pt and improved catalytic activity,while exhibiting negligible influence on the catalytic selectivity for *** the fe content was 0.057%,the catalyst exhibited the highest MCH consumption rate,which was approximately two times higher than that of the catalyst without ***,the incorporation of fe inhibited the formation of coke and reduced the quantity of coke deposits on the catalyst,thereby improving its catalytic ***,fe shows promise as a prospective secondary element for Pt/Al_(2)O_(3) to enhance the MCH dehydrogenation performance.

关键词： methylcyclohexane dehydrogenation hydrogen storage deactivation fe addition

Effect of minor-addition of fe on structural and mechanical properties of CuZrAl bulk metallic glass

在线全文

学校读者我要写书评

暂无评论

Transactions of Nonferrous Metals Society of China 2012年第5期22卷 1123-1126页

作者：许宏伟杜宇雷邓昱南京理工大学材料科学与工程学院材料评价与设计教育部工程研究中心南京210094 江苏省(丹阳)高性能合金材料研究院丹阳212300 南京大学固态微结构国家重点实验室和现代分析中心南京210093

The CuZrAl bulk metallic glass with minor-addition of fe was prepared by rapid quenching method. The structures were examined by X-ray diffraction （XRD）. The effect of fe on the glass-forming ability was studied by differential scanning calorimetry （DSC）. The minor-addition of fe obviously extends the supercooled liquid region ΔTx. The plastic strain of the Cu44Zr48Al7fe bulk metallic glass is about 1.5%. The microstructures were examined by transmission electron microscopy （TEM）. It is found that when 1%-2% fe （mole fraction） were introduced into the CuZrAl alloy matrix, nanoscale phase separation occurs in the as-prepared Cu44Zr48Al7fe bulk metallic glass.

关键词： bulk metallic glass microstructure mechanical property phase separation fe addition

Influence of fe on electrocatalytic activity of iron-nitrogendoped carbon materials toward oxygen reduction reaction

在线全文

学校读者我要写书评

暂无评论

Frontiers in Energy 2022年第5期16卷 812-821页

作者： Lin LI Cehuang FU Shuiyun SHEN Fangling JIANG Guanghua WEI Junliang ZHANG Institute of Fuel Cells School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China SJTU-ParisTech Elite Institute of Technology Shanghai Jiao Tong UniversityShanghai 200240China

The development of highly active nitrogendoped carbon-based transition metal(M-N-C)compounds for the oxygen reduction reaction(ORR)in proton exchange membrane fuel cells(PEMFCs)greatly helps reduce fuel cell cost,thus rapidly promoting their commercial *** different M-N-C electrocatalysts,the series of fe-N-C materials are highly favored because of their high ORR ***,there remains a debate on the effect of fe,and rare investigations focus on the influence of fe addition in the second heat treatment usually performed after acid leaching in the catalyst *** is thus very critical to explore the influences of fe on the ORR electrocatalytic activity,which will,in turn,guide the design of fe-N-C materials with enhanced ***,a series of fe-N-C electrocatalysts are synthesize and the influence of fe on the ORR activity are speculated both experimentally and *** is deduced that the active site lies in the structure of fe-N4,accompanied with the addition of appropriate fe,and the number of active sites increases without the occurrence of agglomeration ***,it is speculated that fe plays an important role in stabilizing N as well as constituting active sites in the second pyrolyzing process.

关键词： oxygen reduction reaction fe-N-C active sites fe addition second heat treatment