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Interactions between γ-TiAl melt and Y_2O_3 ceramic material during directional solidification process 认领 引用 被引量：5
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作者 崔仁杰 张花蕊 +3 位作者 唐晓霞 马立敏 张虎 宫声凯 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第11期2415-2420,共6页
A γ-TiAl alloy with nominal composition of Ti-47%Al（molar fraction） was directionally solidified in an alumina mould with an Y2O3 protective coating.The effects of processing parameters（melting temperature and int... A γ-TiAl alloy with nominal composition of Ti-47%Al（molar fraction） was directionally solidified in an alumina mould with an Y2O3 protective coating.The effects of processing parameters（melting temperature and interaction time） on the metal-coating interface,microstructure and chemical composition of the alloy were evaluated.The result shows that the Y2O3 protective coating exhibits an effective barrier capability to avoid direct contact between the mould base material and the TiAl melt,although the Y2O3 coating is found to suffer some erosion and be slightly dissolved by the molten TiAl due to the coating-metal interactions.The directionally solidified alloys were contaminated with Y and O,and Y2O3 inclusions were dispersed in the metal matrix.The reason for this metal contamination is the Y2O3 coating dissolution by the TiAl melt.One mode of the interaction between Y2O3 and the TiAl melt is dissolution of yttrium and atomic oxygen in the melt by reaction Y2O3（s）=2Y（in TiAl melt）＋3O（in TiAl melt）.Both the extent of alloy contamination and the volume fractions of Y2O3 inclusions depend on the melting temperature and the interaction time. 展开更多
关键词 TiAl alloys Y2O3 protective coatings interactions directional solidification
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Characterization of CuO Species and Thermal Solid-Solid Interaction in CuO/CeO2-Al_2O3Catalyst by In-Situ XRD,Raman Spectroscopy and TPR 认领 引用 被引量：10
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作者 He Mai Luo Mengfei Fang Ping 《Journal of Rare Earths》 SCIE EI CAS 2006年第2期188-192,共5页
Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD,Raman spectroscopy and H2-TPR techniques.For the catalyst... Transference of CuO species and thermal solid-solid interaction in CuO/CeO2-Al2O3 catalyst prepared by an impregnation method were characterized by in-situ XRD,Raman spectroscopy and H2-TPR techniques.For the catalyst calcined at 300℃,two kinds of CuO species coexist on the surface,that is,highly dispersed and bulk CuO crystalline phase.Four kinds of CuO species are present for the catalyst calcined at 600℃,:(1)highly dispersed CuO,(2)bulk CuO on the surface,(3)bulk CuO in the internal layer of CeO2,and(4)CuAl2O4 formed from CuO-Al2O3 interaction.For the catalyst calcined at 800℃,C,besides very little highly dispersed and bulk CuO on the surface,most of the CuO has transferred into the internal layer of CeO2 and the mass of CuAl2O4 are increased.At 900℃,,all of CuO has diffused into the internal layer of CeO2 and formed CuAl2O4.The results show that the distribution of CuO species in the catalysts depends on the calcination temperature;the different CuO species can be effectively confirmed by in-situ XRD,Raman spectroscopy and H2-TPR techniques. 展开更多
关键词 CuO/CeO2-Al2O3 TPR solid-solid interaction rare earths
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Interactions between vacancies and prismatic Σ3 grain boundary in α-Al2O3:First principles study 认领 引用 被引量：2
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作者 王飞 赖文生 +2 位作者 李如松 何彬 黎素芬 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第6期371-375,共5页
Interactions between vacancies and Σ3 prismatic screw-rotation grain boundary in α-Al2O3 are investigated by the first principles projector-augmented wave method.It turns out that the vacancy formation energy decrea... Interactions between vacancies and Σ3 prismatic screw-rotation grain boundary in α-Al2O3 are investigated by the first principles projector-augmented wave method.It turns out that the vacancy formation energy decreases with reducing the distance between vacancy and grain boundary（GB） plane and reaches the minimum on the GB plane（at the atomic layer next to the GB） for an O（Al） vacancy.The O vacancy located on the GB plane can attract other vacancies nearby to form an O–O di-vacancy while the Al vacancy cannot.Moreover,the O–O di-vacancy can further attract other O vacancies to form a zigzag O vacancy chain on the GB plane,which may have an influence on the diffusion behavior of small atoms such as H and He along the GB plane of α-Al2O3. 展开更多
关键词 α-Al2O3 grain boundary（GB） vacancy interaction
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Relationship between Cr-Al Interaction and the Performance of Cr-Al2O3 Catalysts for Isobutane Dehydrogenation 认领 引用 被引量：1
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作者 Deren Fang Jinbo Zhao +3 位作者 Shang Liu Limei Zhang Wanzhong Ren Huimin Zhang 《Modern Research in Catalysis》 2015年第2期50-58,共9页
A series of catalysts were prepared using the kneading molding method and the impregnation method as well as the dry mix method by using different raw materials. By using X-ray diffraction (XRD), X-ray photoelectron s... A series of catalysts were prepared using the kneading molding method and the impregnation method as well as the dry mix method by using different raw materials. By using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and temperature-programmed reduction (TPR) techniques, we studied the relationship between the catalyst performance and the Cr-Al interaction in the catalytic dehydrogenation of isobutane. The results demonstrated that the Cr-Al interaction in the catalyst had a direct influence on the catalytic activity and the selectivity of isobutene. The catalysts prepared using the kneading molding method had higher catalytic activity and isobutene selectivity than those prepared using the dry mix method. By comparison, XRD, XPS, and TPR results showed that the greater the Cr-Al interaction in the catalyst was, the higher the catalytic activity was. Here, we propose a mechanism of isobutane dehydrogenation. 展开更多
关键词 Isobutane Dehydrogenation Cr/Al2O3 Cr-Al Interaction Catalyst Mechanism
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Double spin-glass-like behavior and antiferromagnetic superexchange interaction between Fe3+ ions in α-Ga2-xFe_xO_3(0≤x≤0.4) 认领 引用
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作者 吕益飞 向建勇 +3 位作者 温福昇 吕伟明 胡文涛 柳忠元 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第3期336-344,共9页
Single phase of Fe^3＋-doped α-Ga2-xFexO3（α-GF x O, x = 0.1, 0.2, 0.3, 0.4） is synthesized by treating the β-Ga2-x Fe x O3（β-GF x O） precursors at high temperatures and high pressures. Rietveld refinements of ... Single phase of Fe^3＋-doped α-Ga2-xFexO3（α-GF x O, x = 0.1, 0.2, 0.3, 0.4） is synthesized by treating the β-Ga2-x Fe x O3（β-GF x O） precursors at high temperatures and high pressures. Rietveld refinements of the X-ray diffraction data show that the lattice constants increase monotonically with the increase of Fe^3＋content. Calorimetric measurements show that the temperature of the phase transition from α-GF x O to β-GF x O increases, while the associated enthalpy change decreases upon increasing Fe^3＋content. The optical energy gap deduced from the reflectance measurement is found to decrease monotonically with the increase in Fe3＋content. From the measurements of magnetic field-dependent magnetization and temperature-dependent inverse molar susceptibility, we find that the superexchange interaction between Fe^3＋ions is antiferromagnetic. Remnant magnetization is observed in the Fe^3＋-doped α-GF x O and is attributed to the spin glass in the magnetic sublattice. At high Fe^3＋doping level（x = 0.4）, two evident peaks are observed in the image part of the AC susceptibility χ ac. The frequency dependence in intensity of these two peaks as well as two spin freezing temperatures observed in the DC magnetization measurements of α-GF0.4O is suggested to be the behavior of two spin glasses. 展开更多
关键词 α-Ga2O3 susceptibility superexchange interaction spin glass
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Morphology-dependent interfacial interactions of Fe2O3 with Ag nanoparticles for determining the catalytic reduction of p-nitrophenol 认领 引用 被引量：1
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作者 Ningning Wang Shuai Zeng +1 位作者 Hong Yuan Jin Huang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2020年第6期1-10,共10页
In this work,we fabricated three kinds of Ag/Fe2O3 model catalysts with different morphologies to study the interfacial interactions between Ag and Fe2O3,and how they affected the catalytic activity in hydrogenation o... In this work,we fabricated three kinds of Ag/Fe2O3 model catalysts with different morphologies to study the interfacial interactions between Ag and Fe2O3,and how they affected the catalytic activity in hydrogenation of p-nitrophenol was explored.The hydrothermal method was used to synthesize the metal oxide supported silver catalyst,with various morphologies including nanoplates(NPs),nanospheres(NSs),and nanocubes(NCs).The crystal structure,morphology and surface elements of the composite were investigated by various measurements,such as X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM)and X-ray photoelectron spectroscopy(XPS).The catalytic activity was also evaluated by the reduction of p-nitrophenol to p-aminophenol.It was found that the activities of the above catalysts varied with the morphology of the support.Among them,Ag/Fe2O3 NPs promoted the highest performance,Ag/Fe2O3 NSs were slightly inferior,and Ag/Fe2O3 NCs were the worst.At last,we ascribed the remarkable activity of Ag/Fe2O3 NPs to the strong metal-support interactions between Ag and Fe2O3. 展开更多
关键词 Ag/Fe2O3 Interfacial interaction Catalytic activity p-Nitrophenol Morphology dependence
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原位生成Fe-Al/Al_2O_3复合陶瓷涂层 认领 引用 被引量：4
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作者 张景德 李厚义 +2 位作者 苟金艳 丁昌库 邢丽娟 《人工晶体学报》 EI CAS CSCD 北大核心 2015年第3期616-620,626,共5页
采用化学镀法制备Fe包覆Al核(Al)-壳(Fe)结构复合粉体,以Fe-Al复合粉体为喷涂材料,利用等离子喷涂法在Q235钢基体上制备涂层,在喷涂过程中Fe、Al反应生成Fe-Al金属间化合物和Al2O3,通过控制Fe-Al和Al2O3粉体的混合比例实现涂层的梯度化... 采用化学镀法制备Fe包覆Al核(Al)-壳(Fe)结构复合粉体,以Fe-Al复合粉体为喷涂材料,利用等离子喷涂法在Q235钢基体上制备涂层,在喷涂过程中Fe、Al反应生成Fe-Al金属间化合物和Al2O3,通过控制Fe-Al和Al2O3粉体的混合比例实现涂层的梯度化。利用SEM、XRD研究涂层微观结构与组成,并测试分析了涂层的抗热震性与结合强度。结果表明,涂层主要由Al2O3、Al、Fe3Al和Fe O等组成,喷涂过程中Fe-Al发生反应原位生成了Fe3Al金属间化合物,以Fe-Al为底层的Fe Al/Al2O3梯度涂层的结合强度和抗热震性均明显高于Al2O3涂层,涂层成分的梯度分布和Fe3Al的原位形成改善了涂层的结合状态,提高了结合强度和抗热震性。 展开更多
关键词 化学镀 Fe-Al/Al2O3复合陶瓷涂层 原位生成 结合强度 抗热震性
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Fe-Al/Al_2O_3梯度涂层制备过程中的热机械行为 认领 引用 被引量：9
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作者 刘英才 尹衍升 +1 位作者 王昕 张景德 《航空材料学报》 EI CAS 2005年第3期5-10,共6页
在分析涂层中热应力产生机理的基础上,根据等离子喷涂制备过程中的实际受热条件和力学原理,建立了估算制备引起的涂层热应力的计算模型,并依此估算了Fe3Al-Al2O3涂层中的制备应力。通过对涂层微观结构的SEM观察,研究了Fe3Al-Al2O3涂层... 在分析涂层中热应力产生机理的基础上,根据等离子喷涂制备过程中的实际受热条件和力学原理,建立了估算制备引起的涂层热应力的计算模型,并依此估算了Fe3Al-Al2O3涂层中的制备应力。通过对涂层微观结构的SEM观察,研究了Fe3Al-Al2O3涂层制备过程中的热机械行为特征及其对涂层性能的影响。结果表明,在梯度涂层中,随着组成成分的变化,热机械性能参量与制备应力均相应变化。最大热应力产生于梯度涂层的底层,从基体到表面沿厚度方向热应力逐渐减小。梯度涂层中的最大应力与平均应力值都小于单一Al2O3涂层中的热应力值。涂层与基体的热失配是涂层中热应力产生的根本原因。涂层成分的梯度化,可有效地缓和制备过程中的热应力。 展开更多
关键词 Fe-Al/Al2O3 制备过程 梯度涂层 热机械行为 Al2O3涂层 应力产生 等离子喷涂 sEM观察 热机械性能 热应力 产生机理 力学原理 计算模型 微观结构 涂层性能 行为特征 组成成分 厚度方向 最大应力 应力值 热失配 估算 基体
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(Fe-Al)/Al_2O_3复合纳米粉体的机械球磨特性 认领 引用 被引量：7
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作者 施雨湘 倪俊杰 谢昭德 《武汉大学学报（工学版）》 CAS 北大核心 2004年第2期29-32,共4页
采用机械球磨的方法制备(Fe Al)/Al2O3复合纳米粉体,通过对粉体的X衍射分析研究其机械球磨特性.结果表明:Al2O3阻碍球磨过程中的Fe、Al合金化,有利于粉末的纳米化和机械活化,并大幅提高出粉率.这对机械活化烧结FeAl基Al2O3弥散型块体复... 采用机械球磨的方法制备(Fe Al)/Al2O3复合纳米粉体,通过对粉体的X衍射分析研究其机械球磨特性.结果表明:Al2O3阻碍球磨过程中的Fe、Al合金化,有利于粉末的纳米化和机械活化,并大幅提高出粉率.这对机械活化烧结FeAl基Al2O3弥散型块体复合纳米材料,提高机械球磨效率具有重要意义. 展开更多
关键词 (Fe-AL)/Al2O3 机械球磨 复合纳米粉体 机械活化
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Cr对Fe-Al/Al_2O_3复合材料韧性的影响 认领 引用 被引量：3
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作者 李爱民 孙康宁 +2 位作者 张玉军 李静 尹衍升 《材料工程》 EI CAS 北大核心 2001年第9期21-24,共4页
用多元机械合金化和热压烧结的方法制备添加 Cr的 Fe- Al/ Al2 O3复合材料 ,经力学性能测试及 X射线衍射、能谱和透射电镜分析表明 ,含有适量 Cr的 Fe- Al/ Al2 O3复合材料断裂韧性大大提高 ,最高可达 15 .0 0 MPa· m1 /2以上。并... 用多元机械合金化和热压烧结的方法制备添加 Cr的 Fe- Al/ Al2 O3复合材料 ,经力学性能测试及 X射线衍射、能谱和透射电镜分析表明 ,含有适量 Cr的 Fe- Al/ Al2 O3复合材料断裂韧性大大提高 ,最高可达 15 .0 0 MPa· m1 /2以上。并且在复合材料中形成了棒晶和“N”型结构 。 展开更多
关键词 Fe-Al/Al2O3 复合材料 Cr 韧性 铁铝合金 氧化铝陶瓷 钚 力学性能
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Framework-solvent interactional mechanism and effect of NMP/DMF on solvothermal synthesis of [Zn_4O(BDC)_3]_8 认领 引用 被引量：3
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作者 吴争平 王明雪 +4 位作者 周丽姣 尹周澜 谈进 张锦玲 陈启元 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第11期3722-3731,共10页
In order to explore the effect mechanism of solvent on the synthesis of the metal organic framework materials, the microscopic interaction between solvent and framework and the effects of N,N-dimethyl-formamide(DMF) o... In order to explore the effect mechanism of solvent on the synthesis of the metal organic framework materials, the microscopic interaction between solvent and framework and the effects of N,N-dimethyl-formamide(DMF) or N-methyl- 2-pyrrolidone(NMP) on solvothermal synthesis of [Zn4O(BDC)3]8 were investigated through a combined DFT and experimental study. XRD and SEM showed that the absorbability of NMP in the pore of [Zn4O(BDC)3]8 was weaker than that of DMF. The thermal decomposition temperature of [Zn4O(BDC)3]8 synthesized in DMF was higher than that in NMP according to TG and FT-IR. In addition, the nitrogen sorption isotherms indicated that NMP improved gas sorption property of [Zn4O(BDC)3]8. The COSMO optimized calculations indicated that the total energy of Zn4O(BDC)3 in NMP was higher than that in DMF, and compared with non-solvent system, the charge of zinc atoms decreased and the charge value was the smallest in NMP. Furthermore, the interaction of DMF, NMP or DEF in [Zn4O(BDC)3]8 crystal model was calculated by DFT method. The results suggested that NMP should be easier to be removed from pore of materials than DMF from the point of view of energy state. It can be concluded that NMP was a favorable solvent to synthesize [Zn4O(BDC)3]8 and the microscopic mechanism was that the binding force between Zn4O(BDC)3 and NMP molecule was weaker than DMF. 展开更多
关键词 solvothermal synthesis [Zn4O(BDC)3]8 N-methyl-2-pyrrolidone interactional mechanism COSMO solvation model density functional method
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Ti诱导反应熔体无压浸渗法制备Fe-Al_2O_3-TiC复合材料 认领 引用 被引量：2
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作者 石永亮 郭志猛 +2 位作者 郝俊杰 林涛 曾鲜 《粉末冶金工业》 CAS 北大核心 2012年第5期13-18,共6页
研究了一种Ti诱导反应熔体无压浸渗制备复合材料的方法:通过凝胶注模成形工艺,以蔗糖为造孔剂制备了Ti-Al2O3多孔陶瓷骨架预制体,真空状态下,在1370℃以Fe-2Cr-3C合金熔体无压浸渗该预制体,经过原位反应制备了Fe-Al2O3-TiC复合材料。并... 研究了一种Ti诱导反应熔体无压浸渗制备复合材料的方法:通过凝胶注模成形工艺,以蔗糖为造孔剂制备了Ti-Al2O3多孔陶瓷骨架预制体,真空状态下,在1370℃以Fe-2Cr-3C合金熔体无压浸渗该预制体,经过原位反应制备了Fe-Al2O3-TiC复合材料。并利用SEM、X射线衍射对复合材料的组织结构,元素组成和相组成进行了测试和分析。结果表明:在浸渗过程中骨架中的Ti元素的溶解析出和与C元素的原位反应促进了浸渗过程的进行,在1 370℃保温1.5h,金属液即渗透整个多孔骨架,并且在浸渗过程中仍然维持着骨架的形状。摩擦磨损试验表明,该材料具有优良的抗磨粒磨损性能,其耐磨性优于工业用耐磨铸铁。 展开更多
关键词 Fe-Al2O3-TiC复合材料 无压浸渗 原位反应 多孔材料 凝胶注模
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Fe-Al/Al_2O_3陶瓷基复合材料 认领 引用 被引量：3
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作者 尹衍升 李嘉 +2 位作者 孙康宁 王昕 范润华 《材料导报》 CAS 2003年第2期73-75,共3页
较系统地论述了Fe-Al/Al_2O_2陶瓷基复合材料的研究过程和应用开发前景,对所研材料的制备科学及材料强韧性机理等一并给予了阐述。
关键词 Fe-Al/Al2O3 陶瓷基复合材料 制备 强韧性 铁铝金属间化合物 氧化铝
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Weaker Interactions in Zn2+and Organic Ion-pre-intercalated Vanadium Oxide toward Highly Reversible Zinc-ion Batteries 认领 引用 被引量：6
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作者 Feng Zhang Xiucai Sun +7 位作者 Min Du Xiaofei Zhang Wentao Dong Yuanhua Sang Jianjun Wang Yanlu Li Hong Liu Shuhua Wang 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2021年第4期620-630,共11页
Driven by safety issues,environmental concerns,and high costs,rechargeable aqueous zinc-ion batteries(ZIBs)have received increasing attention in recent years owing to their unique advantages.However,the sluggish kinet... Driven by safety issues,environmental concerns,and high costs,rechargeable aqueous zinc-ion batteries(ZIBs)have received increasing attention in recent years owing to their unique advantages.However,the sluggish kinetics of divalent charge Zn2+in the cathode materials caused by the strong electrostatic interaction and their unsatisfactory cycle life hinder the development of ZIBs.Herein,organic cations and Zn2+ions co-pre-inserted vanadium oxide([N(CH3)4]0.77,Zn0.23)V8O20·3.8H2O are reported as the cathode for ultra-stable aqueous ZIBs,in which the weaker electrostatic interactions between Zn2+and organic ion-pinned vanadium oxide can induce the high reversibility of Zn2+insertion and extraction,thereby improving the cycle life.It is demonstrated that([N(CH3)4]0.77,Zn0.23)V8O20·3.8H2O cathodes deliver a discharge capacity of 181 mA h g-1at8 A g-1and ultra-long life span(99.5%capacity retention after 2000 cycles).A reversible Zn2+/H+ions(de)intercalation storage process and pseudocapacitive charge storage are characterized.The weaker interactions between organic ion and Zn2+open a novel avenue for the design of highly reversible cathode materials with long-term cycling stability. 展开更多
关键词 [N(CH3)4,Zn]V8O20·3.8H2O nanosheets aqueous zinc-ion battery highly reversible organic ion pre-intercalation zinc-carbon interactions
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Fe-Al/Al2O3复合阻氚涂层热处理对CLF-1钢组织与性能的影响 认领 引用 被引量：2
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作者 袁晓明 杨洪广 +1 位作者 迟于喆 占勤 《材料热处理学报》 CAS CSCD 北大核心 2018年第6期96-102,共7页
采用显微硬度测试、X射线衍射、组织观察观察及室温、高温拉伸试验研究了采用粉末包埋渗铝-原位氧化工艺制备的Fe-Al/Al2O3复合涂层热处理对CLF-1低活化钢基体微观组织及力学性能的影响。结果表明：经涂层热处理后,CLF-1钢晶粒尺寸约为9... 采用显微硬度测试、X射线衍射、组织观察观察及室温、高温拉伸试验研究了采用粉末包埋渗铝-原位氧化工艺制备的Fe-Al/Al2O3复合涂层热处理对CLF-1低活化钢基体微观组织及力学性能的影响。结果表明：经涂层热处理后,CLF-1钢晶粒尺寸约为9.91μm,组织为板条马氏体,板条宽度约为600 nm;硬度值为222 HV0.2,室温拉伸强度可达723 MPa,伸长率约为24.05%;在600℃下,拉伸强度可达353 MPa,伸长率约为34.4%;涂层热处理工艺对CLF-1钢基体性能影响不大,涂层处理后基体性能满足微观结构与力学的设计指标。 展开更多
关键词 Fe-Al/Al2O3复合涂层 涂层热处理 显微组织 力学性能
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溶胶-凝胶法制备Fe-Al_2O_3巨磁旋光薄膜 认领 引用 被引量：1
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作者 戴敏 卜胜利 +1 位作者 孙国庆 顾铮■ 《光学技术》 CAS 北大核心 2010年第4期535-539,共5页
用溶胶-凝胶法制备了Fe-Al2O3铁磁金属-非磁绝缘体基体薄膜。实验结果表明,当Fe与Al2O3的质量比为1∶1,热处理温度为420℃时,所制备的薄膜具有最大的磁致旋光(Faraday)效应,测得的费尔德(Verdet)常数V=(6.8×104)°/(T.cm)。通... 用溶胶-凝胶法制备了Fe-Al2O3铁磁金属-非磁绝缘体基体薄膜。实验结果表明,当Fe与Al2O3的质量比为1∶1,热处理温度为420℃时,所制备的薄膜具有最大的磁致旋光(Faraday)效应,测得的费尔德(Verdet)常数V=(6.8×104)°/(T.cm)。通过分析,得出了Fe-Al2O3薄膜巨磁Faraday旋光效应主要是由光、磁场与薄膜相互作用产生剧烈塞曼(Zeeman)分裂引起的。对影响薄膜Faraday旋光效应的各种主要因素进行了讨论。 展开更多
关键词 巨磁Faraday旋光效应 溶胶-凝胶技术 Fe-Al2O3薄膜
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Mechanical properties and microstructure of Fe-Al/Al_2O_3 composite with Cr,Mo and Ti 认领 引用
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作者 李爱民 孙康宁 +2 位作者 毕见强 尹衍升 张玉军 《中国有色金属学会会刊：英文版》 2003年第4期860-863,共4页
When Cr, Mo and Ti were added to Fe Al/Al 2O 3 composite, the bending strength and fracture toughness of the composite were increased sharply. The highest value of bending strength can exceed 600 MPa and the average v... When Cr, Mo and Ti were added to Fe Al/Al 2O 3 composite, the bending strength and fracture toughness of the composite were increased sharply. The highest value of bending strength can exceed 600 MPa and the average value of fracture toughness exceed 12 MPa·m 1/2 . With increasing content of Mo and Ti, the bending strength and fracture toughness both express the trend of increasing first and then decreasing. When the alloying elements were added to the composites the alloying extent is improved. The fracture mode of the composites are mainly transcrystalline. 展开更多
关键词 Fe-Al合金 费尔合金 机械性能 显微结构 Fe-Al/Al2O3复合材料 铬 锰 钛
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Effect of Al_2O_3 Binder on the Precipitated Iron-Based Catalysts for Fischer-Tropsch Synthesis 认领 引用 被引量：9
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作者 Hai-Jun Wan Bao-Shan Wu +4 位作者 Xia An Ting-Zhen Li Zhi-Chao Tao Hong-Wei Xiang Yong-Wang Li 《Journal of Natural Gas Chemistry》 2007年第2期130-138,共9页
A series of iron-based Fischer-Tropsch synthesis （FTS） catalysts incorporated with Al2O3 binder were prepared by the combination of co-precipitation and spray drying technology. The catalyst samples were characteriz... A series of iron-based Fischer-Tropsch synthesis （FTS） catalysts incorporated with Al2O3 binder were prepared by the combination of co-precipitation and spray drying technology. The catalyst samples were characterized by using N2 physical adsorption, temperature-programmed reduction/desorption （TPR/TPD） and MSssbauer effect spectroscopy （MES） methods. The characterization results indicated that the BET surface area increases with increasing Al2O3 content and passes through a maximum at the Al2O3/Fe ratio of 10/100 （weight basis）. After the point, it decreases with further increase in Al2O3 content. The incorporation of Al2O3 binder was found to weaken the surface basicity and suppress the reduction and carburization of iron-based catalysts probably due to the strong K-Al2O3 and Fe-Al2O3 interactions. Furthermore, the H2 adsorption ability of the catalysts is enhanced with increasing Al2O3 content. The FTS performances of the catalysts were tested in a slurry-phase continuously stirred tank reactor （CSTR） under the reaction conditions of 260 ℃, 1.5 MPa, 1000 h^-1 and molar ratio of H2/CO 0.67 for 200 h. The results showed that the addition of small amounts of Al2O3 affects the activity of iron-based catalysts to a little extent. However, with further increase of Al2O3 content, the FTS activity and water gas shift reaction （WGS） activity are decreased severely. The addition of appropriate Al2O3 do not affect the product selectivity, but the catalysts incorporated with large amounts of Al2O3 have higher selectivity for light hydrocarbons and lower selectivity for heavy hydrocarbons. 展开更多
关键词 Fischer-Tropsch synthesis iron-based catalyst Al2O3 binder Fe-Al2O3 interaction
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Fe-Al/Al_2O_3复合材料抗热震性研究 认领 引用 被引量：2
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作者 夏国栋 孙康宁 王素梅 《材料热处理学报》 EI CAS 北大核心 2003年第2期13-15,共3页
采用测硬度和抗压强度的方法 ,测定了Fe Al Al2 O3 复合材料的抗热震性。结果表明Fe Al Al2 O3 复合材料的临界热震温差在 80 0℃左右 ,抗压强度可以较好地反映材料的抗热震性。同时对循环热震后Fe Al Al2 O3 复合材料进行了XRD分析 ,... 采用测硬度和抗压强度的方法 ,测定了Fe Al Al2 O3 复合材料的抗热震性。结果表明Fe Al Al2 O3 复合材料的临界热震温差在 80 0℃左右 ,抗压强度可以较好地反映材料的抗热震性。同时对循环热震后Fe Al Al2 O3 复合材料进行了XRD分析 ,表明该材料在循环热震中存在有序截留、氢脆和氧化现象。最后用热震理论分析了Fe Al Al2 O3 展开更多
关键词 Fe-Al/Al2O3复合材料 抗热震性 抗压强度 硬度
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Fe-Al/Al_2O_3功能梯度涂层材料研究现状及展望 认领 引用 被引量：9
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作者 李静 张景德 +1 位作者 尹衍升 孟繁琴 《山东工业大学学报》 2001年第4期374-378,共5页
对Al2 O3陶瓷和Fe Al金属间化合物及其复合材料作了总结分析 ,综述了Fe Al/Al2 O3功能梯度涂层材料设计的现状 。
关键词 热喷涂 陶瓷涂层 功能梯度材料 三氧化二铝陶瓷 Al2O3陶瓷 铁铝金属间化合物 Fe-Al金属间化合物 复合材料
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