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CeO_2-ZrO_2-La_2O_3-Al_2O_3 composite oxide and its supported palladium catalyst for the treatment of exhaust of natural gas engined vehicles 认领 引用 被引量：5
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作者 Xiaoyu Zhang Enyan,Long +5 位作者 Yile Li Jiaxiu Guo Lijuan Zhang Maochu Gong Minghua Wang Yaoqiang Chen 《Journal of Natural Gas Chemistry》 2009年第2期139-144,共6页
Composite supports CeO2-ZrO2-Al2O3（CZA） and CeO2-ZrO2-Al2O3-La2O3（CZALa） were prepared by co-precipitation method. Palladium catalysts were prepared by impregnation and their purification ability for CH4, CO and N... Composite supports CeO2-ZrO2-Al2O3（CZA） and CeO2-ZrO2-Al2O3-La2O3（CZALa） were prepared by co-precipitation method. Palladium catalysts were prepared by impregnation and their purification ability for CH4, CO and NOx in the mixture gas simulated the exhaust from natural gas vehicles （NGVs） operated under stoichiometric condition was investigated. The effect of La2O3 on the physicochemical properties of supports and catalysts was characterized by various techniques. The characterizations with X-ray diffraction （XRD） and Raman spectroscopy revealed that the doping of La2O3 restrained effectively the sintering of crystallite particles, maintained the crystallite particles in nanoscale and stabilized the crystal phase after calcination at 1000 ℃. The results of N2-adsorption, H2-temperatnre-programmed reduction （H2-TPR） and oxygen storage capacity （OSC） measurements indicated that La2O3 improved the textural properties, reducibility and OSC of composite supports. Activity testing results showed that the catalysts exhibit excellent activities for the simultaneous removal of methane, CO and NOx in the simulated exhaust gas. The catalysts supported on CZALa showed remarkable thermal stability and catalytic activity for the three pollutants, especially for NOx. The prepared palladium catalysts have high ability to remove NOx, CH4 and CO, and they can be used as excellent catalysts for the purification of exhaust from NGVs operated under stoichiometric condition. The catalysts reported in this work also have significant potential in industrial application because of their high performance and low cost. 展开更多
关键词 Pd catalysts natural gas vehicles exhaust methane oxidation NOx conversion CeO2-ZrO2-Al2O3 La2O3
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Morphology and Frictional Characteristics Under Electrical Currents of Al_2O_3/Cu Composites Prepared by Internal Oxidation 认领 引用 被引量：10
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作者 刘瑞华 宋克兴 +3 位作者 贾淑果 徐晓峰 郜建新 国秀花 《Chinese Journal of Aeronautics》 SCIE EI CAS 2008年第3期281-288,共8页
Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and coppe... Two Al2O3/Cu composites containing 0.24 wt.% Al2O3 and 0.60 wt.% Al2O3 separately are prepared by internal oxidation. Effects of sliding speed and pressure on the frictional characteristics of the composites and copper against brass are investigated and compared. The changes in morphology of the sliding surface and subsurface are examined with scanning electron microscope （SEM） and energy dispersive X-ray spectrum （EDS）. The results show that the wear resistance of the Al2O3/Cu composites is superior to that of copper under the same conditions, Under a given electrical current, the wear rate of Al2O3/Cu composites decreases as the Al2O3-content increases, However, the wear rates of the Al2O3/Cu composites and copper increase as the sliding speed and pressure increase under dry sliding condition. The main wear mechanisms for Al2O3/Cu composites are of abrasion and adhesion; for copper, it is adhesion, although wear by oxidation and electrical erosion can also be observed as the speed and pressure rise. 展开更多
关键词 Al2O3/Cu composite internal oxidation friction and wear surface morphology current carder
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Oxidation of Al_2O_3-30%TiCN-0.2%Y_2O_3 Composite 认领 引用 被引量：3
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作者 李喜坤 邱关明 +3 位作者 修稚萌 孙旭东 严长浩 代少俊 《Journal of Rare Earths》 SCIE EI CAS 2005年第3期276-279,共4页
The oxidation behavior of Al2O3-30%TiCN-0.2%Y2O3 composite and its effect on high temperature bending strength was studied. The result indicates that the mass gain during static oxidation of the material under normal ... The oxidation behavior of Al2O3-30%TiCN-0.2%Y2O3 composite and its effect on high temperature bending strength was studied. The result indicates that the mass gain during static oxidation of the material under normal atmosphere follows the parabolic law. Oxide increases with increasing temperature and prolonging time. It has good oxidation resistance. The product of oxidation of the material is TiO2. Therefore, the volume of the material expands. The oxide film is destroyed because residual stress inside the oxide film is released. Proper oxidation is beneficial to the improvement of bending strength of Al2O3-30%TiCN-0.2%Y2O3 composite. The strength increase is up to 4.5%. 展开更多
关键词 composite Al2O3-30%TiCN-0.2%Y2O3 oxidation behavior bend strength parabolic law residual stress rare earths
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Preparation of Al_2O_3/Au nano-laminated composite coatings and their oxidation resistance on stainless steel 认领 引用 被引量：3
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作者 高俊国 陆峰 +2 位作者 汤智慧 王长亮 何业东 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第10期2491-2497,共7页
Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employ... Al2O3/Au nano-laminated composite coatings were prepared by means of magnetron sputtering. The coating was compact and comprised of nano-laminated Al2O3 and Au layers. High temperature cyclic oxidation test was employed to investigate the oxidation resistance of the composite coatings. The results revealed that the applied Al2O3/Au nano-laminated composite coatings improved the oxidation and spallation resistance of the stainless steel substrate significantly. The mechanism accounting for oxidation resistance was related with the suppression of inward oxygen diffusion and selective oxidation of Cr in the substrate. The mechanism accounting for spallation resistance was attributed to the relaxation of thermal stress by the nano-laminated structure. 展开更多
关键词 Al2O3/Au composite coatings magnetron sputtering oxidation resistance spallation resistance
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Comparative investigation of microstructure and high-temperature oxidation resistance of high-velocity oxy-fuel sprayed CoNiCrAlY/nano-Al2O3 composite coatings using satellited powders 认领 引用 被引量：7
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作者 Pejman Zamani Zia Valefi 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第9期1779-1791,共13页
Satellited CoNiCrAlY–Al2O3feedstocks with 2wt%, 4wt%, and 6wt% oxide nanoparticles and pure CoNiCrAlY powder were deposited by the high-velocity oxy fuel process on an Inconel738 superalloy substrate. The oxida... Satellited CoNiCrAlY–Al2O3feedstocks with 2wt%, 4wt%, and 6wt% oxide nanoparticles and pure CoNiCrAlY powder were deposited by the high-velocity oxy fuel process on an Inconel738 superalloy substrate. The oxidation test was performed at 1050℃ for 5, 50, 100,150, 200, and 400 h. The microstructure and phase composition of powders and coatings were characterized by scanning electron microscopy and X-ray diffraction, respectively. The bonding strength of the coatings was also evaluated. The results proved that with the increase in the percentage of nanoparticles(from 2wt% to 6wt%), the amount of porosity(from 1vol% to 4.7vol%), unmelted particles, and roughness of the coatings(from 4.8 to 8.8 μm) increased, and the bonding strength decreased from 71 to 48 MPa. The thicknesses of the thermally grown oxide layer of pure and composite coatings(2wt%, 4wt%, and 6wt%) after 400 h oxidation were measured as 6.5, 5.5, 7.6, and 8.1 μm, respectively.The CoNiCrAlY–2wt% Al2O3coating showed the highest oxidation resistance due to the diffusion barrier effect of well-dispersed nanoparticles. The CoNiCrAlY–6wt% Al2O3coating had the lowest oxidation resistance due to its rough surface morphology and porous microstructure. 展开更多
关键词 MCrAlY coating CoNiCrAlY-Al2O3composite satellited feedstock microstructure high-temperature oxidation high-velocity oxy-fuel spraying
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Effect of La_2O_3/Ce O_2 particle size on high-temperature oxidation resistance of electrodeposited Ni-La_2O_3/Ce O_2 composites 认领 引用 被引量：3
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作者 孟君晟 吉泽升 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3571-3577,共7页
Ni-La2O3/CeO2 composite films were prepared by electrodeposition from a nickel sulfate bath containing certain content of micrometer and nanometer La2O3/CeO2 particles. The effect of La2O3 or CeO2 particle size on the... Ni-La2O3/CeO2 composite films were prepared by electrodeposition from a nickel sulfate bath containing certain content of micrometer and nanometer La2O3/CeO2 particles. The effect of La2O3 or CeO2 particle size on the oxidation resistance of the electrodeposited Ni-La2O3/CeO2 composites in air at 1000 °C was studied. The results indicate that, compared with the electrodeposited Ni-film, Ni-La2O3/CeO2 composites exhibit a superior oxidation resistance due to the codeposited La2O3 or CeO2 particles blocking the outward diffusion of nickel. Moreover, compared with nanoparticles, La2O3 or CeO2 microparticles have stronger effect because La2O3 or CeO2 microparticles also act as a diffusion barrier layer at the onset of oxidation. 展开更多
关键词 Ni-based composite electrodeposition high-temperature oxidation La2O3 CeO2 reactive element effect oxidation mechanism
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Effect of Crystallinity on Electrochemical Insertion/Extraction of Li in Transition Metal Oxides Part Ⅱ: TiO_2, V_2O_5 and MoO_3 认领 引用 被引量：1
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作者 Tomoki TSUMURA and Michio INAGAKI 《Journal of Materials Science & Technology》 SCIE EI CAS 2000年第1期5-14,共10页
Electrochemical insertion/extraction of Li on cathode materials of anatase type TiO_2, quasilayered structure V_2O_5 and layered structure MoO_3 was measured on samples of which structures were well characterized and ... Electrochemical insertion/extraction of Li on cathode materials of anatase type TiO_2, quasilayered structure V_2O_5 and layered structure MoO_3 was measured on samples of which structures were well characterized and showed a wide range of crystallinity. On the basis of experimental results on structure, morphology and charge-discharge characteristics, the effect of crystallinity of the cathode materials on electrochemical Li insertion/extraction pedermance was discussed. These three transition metal oxides were classified as one group on the basis of whether the crystallinity of these oxides affects to the performance or not; LiMn_2O_4 and LiCo0.5O_2 belongs to the former group and TiO_2, V_2O_5 and MoO_3 to the latter. 展开更多
关键词 Li Effect of Crystallinity on Electrochemical Insertion/Extraction of Li in Transition Metal Oxides Part V2O5 and MoO3
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Oxidation Behavior of Fe26Cr1Mo Stainless Steel in the Presence of Ni-La_2O_3 Electrodeposited Composite Film 认领 引用
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作者 彭晓 周龙江 +1 位作者 李铁藩 吴维岁 《Journal of Rare Earths》 SCIE EI CAS 1997年第3期36-41,共6页
The oxidation behaviors of Fe26Cr1Mo with and without the Ni La 2O 3 electrodeposited composite film have been investigated by thermogravimetric analysis (TGA) and a scanning electron microscope equipped with an energ... The oxidation behaviors of Fe26Cr1Mo with and without the Ni La 2O 3 electrodeposited composite film have been investigated by thermogravimetric analysis (TGA) and a scanning electron microscope equipped with an energy dispersive analytical X ray system(SEM/EDAX). The experimental results show that the oxide scale growing on Fe26Cr1Mo exposed at 900 ℃ spalled severely during cooling, while after the stainless steel was coated with the Ni La 2O 3 electrodeposited composite film, its high temperature cyclic oxidation resistance was significantly improved. The reason is that a La 2O 3 modified NiO scale, which has a superior adhesion to the substrate, was formed on the Fe26Cr1Mo stainless steel coated with Ni La 2O 3 composite film. 展开更多
关键词 Rare earths La Ni La 2O 3 electrodeposited composite film Stainless steel Oxidation behavior
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Preparation of Al_2O_3-SiO_2-TiO_2-ZrO_2 Composite Ceramic Membranes by Sol-Gel Method 认领 引用
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作者 吴建锋 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2005年第1期42-45,共4页
Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a nat... Al 2O 3-SiO 2-TiO 2-ZrO 2 supported membranes were prepar ed by Sol-Gel method. These composite ceramic membranes are level, even and no macro crack. There exist several crystalline phases such as Al 2O 3, TiO 2(a natase), Al 2SiO 5, and ZrO 2 in these membranes. Changing the molar ratio of Al∶Si∶Ti∶Zr,the kinds and content of crystal phases of composite membranes could be different, which may lead to a variety of microstructure of membranes. The surface nanoscale topography and microstructure of membranes were investiga ted by XRD,SEM,AFM,EPMA. The effects of additives and heat treatments on the sur face nanoscale topography and microstructure of composite ceramic membranes were also analyzed. 展开更多
关键词 sol-gel method Al 2O 3-SiO 2-TiO 2-ZrO 2 composite ceramic membranes surface nanoscale topography microstructure
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EVOLUTION OF MICROSTRUCTURE IN OXIDATIVE GROWTH OF Al_2O_3/Al ALLOY COMPOSITES 认领 引用
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作者 Xia Changqing Jin Zhanpeng 《中国有色金属学会会刊：英文版》 1996年第3期122-126,共5页
EVOLUTIONOFMICROSTRUCTUREINOXIDATIVEGROWTHOFAl_2O_3／AlALLOYCOMPOSITES￥XiaChangqing；JinZhanpeng（DepartmentofMaterialsScienceand...
关键词 oxide layer Al2O3/Al alloy composites oxygen activity
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Kinetics of Oxidation for β-Sialon in Diphase β-Sialon/Al_2O_3 Composite 认领 引用 被引量：5
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作者 Youfen LI Yanruo HONG XangChong ZHONG and Tingshou LI 《Journal of Materials Science & Technology》 SCIE EI CAS 1999年第1期21-24,共4页
Non-isothermal kinetic research has been carried out on oxidation behavior of β-Sialon in diphaseβ-Sialon/Al_2O_3 composite at high temperatures. A kinetic formula is established for non-isothermal oxidation process... Non-isothermal kinetic research has been carried out on oxidation behavior of β-Sialon in diphaseβ-Sialon/Al_2O_3 composite at high temperatures. A kinetic formula is established for non-isothermal oxidation process of β-Sialon. The rate of oxidation process is controlled by chemicalreaction at the initial stage and then by diffusion. The apparent activation energies and appar-ent rate constants at different temperatures are determined by treating TG data of the overallprocess. 展开更多
关键词 Al Kinetics of Oxidation for Sialon/Al2O3 Composite
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One-pot Synthesis of MoO3/PI Composite with Enhanced Photocatalytic Performance for Oxidative Coupling of Amines to Imines 认领 引用 被引量：1
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作者 Zhao Wenjie Du Chengxin +4 位作者 Song Yu Zhou Yafen Wang Qing Zhou Limei Xu Bin 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS CSCD 2024年第2期57-71,共15页
Organic-inorganic MoO3/PI(MoPI)composites were prepared using a simple one-pot thermal copolymerization method.The resulting composites exhibited enhanced photocatalytic activity for the selective oxidation of benz... Organic-inorganic MoO3/PI(MoPI)composites were prepared using a simple one-pot thermal copolymerization method.The resulting composites exhibited enhanced photocatalytic activity for the selective oxidation of benzylamine to N-benzylidene benzylamine(N-BDBA)in ambient air under simulated solar light irradiation compared to pristine MoO3 or polyimide(PI).In particular,the MoPI composite with a 0.3:1 molar ratio of Mo to melamine,referred to as MoPI-0.3,demonstrated the best performance in the photo-oxidation of benzylamine,achieving a benzylamine conversion of 95%with a N-BDBA selectivity exceeding 99%after 3 h irradiation.The enhanced photocatalytic activity of the MoPI-0.3 catalyst was attributed to the formation of a direct Z-scheme heterojunction between MoO3 and PI,facilitating more efficient separation of the photoinduced electrons and holes.Additionally,the MoPI-0.3 composite maintained considerably high activity over four consecutive cycles,highlighting its good stability and recyclability.Furthermore,the MoPI-0.3 composite could photo-oxidize benzylamine derivatives and heterocyclic amines to their corresponding imines,demonstrating the universal applicability of this composite catalyst. 展开更多
关键词 MoO3/PI composite photocatalysis amine oxidation imine
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高灵敏度高选择性的Pt/In2O3复合材料乙烷传感器研究 认领 引用
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作者 罗宗昌 周柯 +5 位作者 孙建海 周天烨 牛致远 黎雪慧 韩方源 张龙飞 《仪表技术与传感器》 CSCD 北大核心 2026年第3期1-4,16,共4页
为了解决低浓度乙烷气体检测的问题,实现对乙烷气体的高灵敏高精度低成本监测,文中通过水热法合成了球状氧化铟(In2O3)纳米颗粒,并且通过原位还原法掺杂了金属铂(Pt),最终制备了Pt/In2O3纳米复合材料作为乙烷传感器的敏感... 为了解决低浓度乙烷气体检测的问题,实现对乙烷气体的高灵敏高精度低成本监测,文中通过水热法合成了球状氧化铟(In2O3)纳米颗粒,并且通过原位还原法掺杂了金属铂(Pt),最终制备了Pt/In2O3纳米复合材料作为乙烷传感器的敏感元件。通过扫描电子显微镜(scanning electron microscopy,SEM)、能量色散光谱分析仪(energy dispersive spectrometer,EDS)和X射线衍射实验,证实了合成材料的微观形貌与元素组成。将制备的材料涂敷于微型热板上封装制成气体传感器,进行气体检测实验。实验结果表明:在270℃的工作温度下,传感器对于乙烷有良好的选择性、快速的响应时间(32 s)和线性度,在多次重复性测试过程中,传感器响应可以恢复到初始值,具有较高的稳定性。该传感器可以应用于一系列需要检测低浓度乙烷气体的场景。 展开更多
关键词 金属氧化物半导体传感器 Pt/In2O3复合材料 乙烷气体检测
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One pot synthesis of Ru(bpy)_32+ doped graphene oxide-silica composite film for constructing high performance solid-state electrochemiluminescent sensor 认领 引用
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作者 Gen-Ping Yan Xiao-Xiao He +4 位作者 Ke-Min Wang Yong-Hong Wang Jin-Quan Liu Li-Xin Jian Yin-Fei Mao 《Chinese Chemical Letters》 SCIE CAS CSCD 2014年第12期1520-1524,共5页
The Ru（bpy）3^2＋ doped graphene oxide-silica composite film（Ru/GO-SiCF） was synthesized by one pot hydrolysis and condensation of tetraethylorthosilicate（TEOS） in the water-alcohol solution of graphene oxide and... The Ru（bpy）3^2＋ doped graphene oxide-silica composite film（Ru/GO-SiCF） was synthesized by one pot hydrolysis and condensation of tetraethylorthosilicate（TEOS） in the water-alcohol solution of graphene oxide and Ru（bpy）3^2＋ at room temperature.The prepared Ru/GO-SiCF modified glassy carbon electrode（GCE） showed excellent electrochemiluminescence（ECL） behavior for the determination of tripropylamine（TPA） with high sensitivity and good stability.We expected this simple and novel material will find further application in construction of other targets sensors. 展开更多
关键词 Graphene oxide（GO）-silica composite Electrochemiluminescence（ECL） Ru（bpy）3^2＋ Sensor
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CYCLIC OXIDATION OF Ni-La_2O_3 COMPOSITE COATINGS ELECTRODEPOSITED ON NICKEL AND Fe26Cr STAINLESS STEEL 认领 引用
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作者 Peng, Xiao Li, Tiefan Wu, Weitao 《中国有色金属学会会刊：英文版》 1997年第3期15-21,共7页
CYCLICOXIDATIONOFNiLa2O3COMPOSITECOATINGSELECTRODEPOSITEDONNICKELANDFe26CrSTAINLESSSTEEL①PengXiao1，2，LiTiefan1，2，WuWeitao1St...
关键词 nickel Fe26Cr stainless steel cyclic oxidation electrodeposited Ni La 2O 3 composite film
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Catalytic Partial Oxidation of Methane over Ni/CeO_2-ZrO_2-Al_2O_3 认领 引用 被引量：10
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作者 梅大江 陈耀强 +3 位作者 钟俊波 魏振玲 马迪 龚茂初 《Journal of Rare Earths》 SCIE EI CAS 2007年第3期311-315,共5页
Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction（XRD）,BET areas,H2 temperature-programmed reduction（H2-TPR）,and X-ray photoelectron sp... Nickel catalysts supported on CeO2-ZrO2-CeO2,ZrO2-Al2O3 and Al2O3 were prepared and characterized by means of X-ray diffraction（XRD）,BET areas,H2 temperature-programmed reduction（H2-TPR）,and X-ray photoelectron spectroscopy（XPS）.Through the test of catalytic partial oxidation of methane（CPOM）,Ni/CeO2-ZrO2-Al2O3 displayed the highest activity,which resulted from its largest BET area and best NiO dispersion.Furthermore,Ni/CeO2-ZrO2-Al2O3 maintained a long-time stability in CPOM,which was attributed to its best coking resistance among all the prepared catalysts. 展开更多
关键词 Ni/CeO2-ZrO2-Al2O3 catalyst catalytic partial oxidation of methane carbon deposition rare earths
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高填充Al2O3/PDMS导热复合材料的高效制备及性能强化 认领 引用
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作者 邵正康 吴健 +2 位作者 张玲洁 黄祯 暴宁钟 《化工学报》 EI CAS CSCD 北大核心 2026年第2期954-967,共14页
氧化铝(Al2O3)因其高导热性、优异的电绝缘性与化学稳定性,被广泛用于增强聚合物材料的热导率。然而,高填充体系下Al2O3在聚合物基体中分散困难,二者界面相容性差,给材料的加工与性能提升带来了困难。针对高填充[85.7%(质... 氧化铝(Al2O3)因其高导热性、优异的电绝缘性与化学稳定性,被广泛用于增强聚合物材料的热导率。然而,高填充体系下Al2O3在聚合物基体中分散困难,二者界面相容性差,给材料的加工与性能提升带来了困难。针对高填充[85.7%(质量分数)]Al2O3/聚二甲基硅氧烷(PDMS)体系,提出采用双螺杆挤出机强化混合效果并提升加工效率;并通过酰胺键的共价接枝,将改性多孔氧化石墨烯(M-HGO)涂覆在Al2O3表面,以增强Al2O3与PDMS的界面相容性,同时提高Al2O3的导热性能。结果表明,双螺杆挤出机连续挤出(混合时间约5 min)所制备的20μm Al2O3/PDMS便达到采用转矩流变仪混合30 min的材料性能,热导率为1.87 W·m-1·K-1;而手工搅拌1 h后仍无法得到有效混合,材料热导率仅为1.50 W·m-1·K-1。进一步地,基于5μm+20μm Al2O3复合填充体系,将酰氯改性M-HGO共价接枝于氨基改性Al2O3(M-Al2O3)表面并进行热还原,得到M-Al2O3@rMHGO复合填料,并采用双螺杆挤出机制备了M-Al2O3@rM-HGO/PDMS复合材料。添加M-Al2O3@0.4%rM-HGO后复合材料热导率高达2.64 W·m-1·K-1,较未改性Al2O3/PDMS提高23.4%,增强效果优于GO物理涂覆Al2O3及传统硅烷偶联剂改性Al2O3。此外,M-Al2O3@0.4%rM-HGO/PDMS的抗拉强度为1.75 MPa,高于未改性Al2O3/PDMS和其他方法改性Al2O3/PDMS。 展开更多
关键词 导热复合材料 PDMS 氧化铝 双螺杆挤出 氧化石墨烯
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Fabrication of an in-situ nanoAl_2O_3/Cu composite with high strength and high electric conductivity 认领 引用 被引量：7
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作者 SHENYutian ZHUJing +2 位作者 XUYanji WANGBaoheng LITongze 《Rare Metals》 SCIE EI CAS 2005年第1期46-54,共9页
A heat-resistant dispersion-strengthening nano-Al_2O_3/Cu composite with highstrength and high electric conductivity was fabricated in a multiplex medium. The internaloxidation product, microstructures and properties ... A heat-resistant dispersion-strengthening nano-Al_2O_3/Cu composite with highstrength and high electric conductivity was fabricated in a multiplex medium. The internaloxidation product, microstructures and properties of the composite, and the process flow weresystematically studied. It is confirmed that this new technique simplifies the process and improvesthe properties of the composite. X-ray analysis indicates that the alumina particles formed duringinternal oxidation consist of a large mount of gamma-Al_2O_3 and a certain amount of theta-Al_2O_3and alpha-Al_2O_3. TEM observation shows that the obtained gamma-Al_2O_3 nano-particles areuniformly distributed in the copper grains; their mean size and space between particles are 7 runand 30 nm, respectively. The main properties of the composite with 50 percent cold deformation areas follows: the electric conductivity is 51 MS/m (87 percent IACS), sigma_b = 628 MPa, and thehardness is HRB86. After annealing at 1273 K, all or most of the above properties remain, and themicrostructures are still dependent on elongated fiber-form grains. 展开更多
关键词 Al_2O_3/Cu composite internal oxidation dispersion strengthening microstructure property
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Influence of pre-synthesized Al2O3-SiC composite powder from clay on properties of low-carbon MgO-C refractories 认领 引用 被引量：7
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作者 Bei-yue Ma Xin-ming Ren +5 位作者 Zhi Gao Fan Qian Zhao-yang Liu Guo-qi Liu Jing-kun Yu Gao-feng Fu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2022年第7期1080-1088,共9页
To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective strategy.Al2O3–SiC composite powder was prepared from clay using electromagnetic ind... To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective strategy.Al2O3–SiC composite powder was prepared from clay using electromagnetic induction heating and carbon embedded methods.Further,the Al2O3–SiC composite powder synthesized by electromagnetic induction heating at 600 A was added into low-carbon MgO–C refractories(4 wt.%)to improve their properties.The results showed that when the addition amount of Al2O3–SiC composite powder is within the range of 2.5–5.0 wt.%,the properties of low-carbon MgO–C samples were significantly improved,e.g.,the apparent porosity of 7.58%–8.04%,the bulk density of 2.98–2.99 g cm-3,the cold compressive strength of 55.72–57.93 MPa,the residual strength after three air quenching at 1100°C of 74.86%–78.04%,and the decarburized layer depth after oxidized at 1400°C for 2 h of 14.03–14.87 mm.Consequently,the idea for the rapid synthesis of Al2O3–SiC composite powder provides an alternative low-carbon MgO–C refractories performance optimization strategy. 展开更多
关键词 MgO–C refractory Electromagnetic induction heating Al2O3–SiC composite powder Oxidation
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钼含量对MoO_3-ZrO_2结构及异构化性能的影响 认领 引用 被引量：2
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作者 刘晓丹 张维 +4 位作者 白英芝 王海彦 魏民 齐振东 喻艇 《应用化工》 CAS CSCD 北大核心 2015年第8期1499-1502,共4页
采用水热一步法合成了复合型Mo O3-Zr O2固体超强酸,运用X射线衍射(XRD)、N2吸附脱附(BET)、红外光谱(FTIR)和扫描电镜(SEM)对催化剂进行表征,研究Mo O3质量分数对Mo O3-Zr O2结构的影响。以正己烷为原料在小型固定床反应器上考察Mo O3-... 采用水热一步法合成了复合型Mo O3-Zr O2固体超强酸,运用X射线衍射(XRD)、N2吸附脱附(BET)、红外光谱(FTIR)和扫描电镜(SEM)对催化剂进行表征,研究Mo O3质量分数对Mo O3-Zr O2结构的影响。以正己烷为原料在小型固定床反应器上考察Mo O3-Zr O2催化剂的异构化性能。结果表明,Mo O3的引入促进了Zr O2由单斜晶相向四方晶相的转变,增加了Mo O3-Zr O2的比表面积。当Mo O3含量为20%时,Mo O3在Zr O2表面达到单层分散,形成了大量的超强酸位,其正己烷的转化率和异构体的收率分别为48.6%和34.1%。 展开更多
关键词 MoO3-ZrO2 固体超强酸 MoO3 异构化
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