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焊后热处理对NiCrMo-3熔敷金属腐蚀行为的影响
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作者 程虹蓓 曹睿 +3 位作者 杨飞 徐晓龙 贾兴旺 蒋勇 《焊接学报》 EI CAS CSCD 北大核心 2023年第7期32-39,I0004,I0005,共10页
以NiCrMo-3合金熔敷金属为研究对象,通过扫描电子显微镜、透射电子显微镜、X射线衍射仪等研究了原始焊态与690℃保温8 h热处理态熔敷金属的耐腐蚀性能差异.结果表明,与焊态试样相比,热处理试样具有良好的耐晶间腐蚀性能,在HNO3溶液中浸... 以NiCrMo-3合金熔敷金属为研究对象,通过扫描电子显微镜、透射电子显微镜、X射线衍射仪等研究了原始焊态与690℃保温8 h热处理态熔敷金属的耐腐蚀性能差异.结果表明,与焊态试样相比,热处理试样具有良好的耐晶间腐蚀性能,在HNO3溶液中浸泡不同的时间发生了点蚀和晶间腐蚀;热处理态金属除了点蚀与晶间腐蚀还发生了部分枝晶间腐蚀行为.热处理后的试样由于NbC,Laves相数量及尺寸的增加导致腐蚀敏感性升高.析出相NbC,Laves相与基体的电位差导致在腐蚀介质作用下发生点蚀.晶界析出物导致Ni,Cr元素含量的降低,从而增加了熔敷金属晶间腐蚀敏感性.热处理后由于元素再分配导致枝晶间Nb,Mo等元素的富集和Ni,Cr等元素的贫化,引起枝晶间腐蚀.创新点:(1)利用衍射花样标定确定析出相的晶体结构,结合X射线衍射分析得出析出相类型.(2)对热处理前后埋弧焊焊接接头的析出相数量和尺寸进行统计,阐明析出相对耐腐蚀性能的影响. 展开更多
关键词 nicrmo-3熔敷金属 热处理工艺 析出相 耐腐蚀性能
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3D Artificial Array Interface Engineering Enabling Dendrite-Free Stable Zn Metal Anode 被引量:2
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作者 Jianbin Ruan Dingtao Ma +6 位作者 Kefeng Ouyang Sicheng Shen Ming Yang Yanyi Wang Jinlai Zhao Hongwei Mi Peixin Zhang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第3期112-128,共17页
The ripple effect induced by uncontrollable Zn deposition is considered as the Achilles heel for developing high-performance aqueous Zn-ion batteries.For this problem,this work reports a design concept of 3D artificia... The ripple effect induced by uncontrollable Zn deposition is considered as the Achilles heel for developing high-performance aqueous Zn-ion batteries.For this problem,this work reports a design concept of 3D artificial array interface engineering to achieve volume stress elimination,preferred orientation growth and dendrite-free stable Zn metal anode.The mechanism of MXene array interface on modulating the growth kinetics and deposition behavior of Zn atoms were firstly disclosed on the multi-scale level,including the in-situ optical microscopy and transient simulation at the mesoscopic scale,in-situ Raman spectroscopy and in-situ X-ray diffraction at the microscopic scale,as well as density functional theory calculation at the atomic scale.As indicated by the electrochemical performance tests,such engineered electrode exhibits the comprehensive enhancements not only in the resistance of corrosion and hydrogen evolution,but also the rate capability and cyclic stability.High-rate performance(20 mA cm^(-2))and durable cycle lifespan(1350 h at 0.5 mA cm^(-2),1500 h at 1 mA cm^(-2)and 800 h at 5 mA cm^(-2))can be realized.Moreover,the improvement of rate capability(214.1 mAh g^(-1)obtained at 10 A g^(-1))and cyclic stability also can be demonstrated in the case of 3D MXene array@Zn/VO2battery.Beyond the previous 2D closed interface engineering,this research offers a unique 3D open array interface engineering to stabilize Zn metal anode,the controllable Zn deposition mechanism revealed is also expected to deepen the fundamental of rechargeable batteries including but not limited to aqueous Zn metal batteries. 展开更多
关键词 Aqueous Zn-ion batteries Volume stress 3D artificial array interface Controllable deposition Zn metal anode
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A Generalized Polymer Precursor Ink Design for 3D Printing of Functional Metal Oxides
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作者 Hehao Chen Jizhe Wang +7 位作者 Siying Peng Dongna Liu Wei Yan Xinggang Shang Boyu Zhang Yuan Yao Yue Hui Nanjia Zhou 《Nano-Micro Letters》 SCIE EI CAS CSCD 2023年第10期433-448,共16页
Three-dimensional-structured metal oxides have myriad applications for optoelectronic devices.Comparing to conventional lithography-based manufacturing methods which face significant challenges for 3D device architect... Three-dimensional-structured metal oxides have myriad applications for optoelectronic devices.Comparing to conventional lithography-based manufacturing methods which face significant challenges for 3D device architectures,additive manufacturing approaches such as direct ink writing offer convenient,on-demand manufacturing of 3D oxides with high resolutions down to sub-micrometer scales.However,the lack of a universal ink design strategy greatly limits the choices of printable oxides.Here,a universal,facile synthetic strategy is developed for direct ink writable polymer precursor inks based on metal-polymer coordination effect.Specifically,polyethyleneimine functionalized by ethylenediaminetetraacetic acid is employed as the polymer matrix for adsorbing targeted metal ions.Next,glucose is introduced as a crosslinker for endowing the polymer precursor inks with a thermosetting property required for 3D printing via the Maillard reaction.For demonstrations,binary(i.e.,ZnO,CuO,In_(2)O_(3),Ga_(2)O_(3),TiO_(2),and Y_(2)O_(3)) and ternary metal oxides(i.e.,BaTiO_(3) and SrTiO_(3)) are printed into 3D architectures with sub-micrometer resolution by extruding the inks through ultrafine nozzles.Upon thermal crosslinking and pyrolysis,the 3D microarchitectures with woodpile geometries exhibit strong light-matter coupling in the mid-infrared region.The design strategy for printable inks opens a new pathway toward 3D-printed optoelectronic devices based on functional oxides. 展开更多
关键词 3D printing Maillard reaction Polymer-assisted deposition metal oxide Photonic crystal
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贵金属沉积对Ga_(2)O_(3)光催化降解有机染料的影响
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作者 钟瑞 舒国强 +1 位作者 马奎 岳海荣 《应用化工》 CAS CSCD 北大核心 2024年第8期1749-1754,共6页
采用沉积沉淀法成功将Au、Ag、Pd、Rh和Ru 5种贵金属元素负载在棒状Ga_(2)O_(3)材料上,表征了负载前后催化剂的形貌结构和物化性质,并考察了其在不同光源下降解有机染料的性能。在300 W氙灯的照射下,Ag负载Ga_(2)O_(3)表现出最佳的光催... 采用沉积沉淀法成功将Au、Ag、Pd、Rh和Ru 5种贵金属元素负载在棒状Ga_(2)O_(3)材料上,表征了负载前后催化剂的形貌结构和物化性质,并考察了其在不同光源下降解有机染料的性能。在300 W氙灯的照射下,Ag负载Ga_(2)O_(3)表现出最佳的光催化活性,反应12 min后降解83%的有机染料(IC,50 mg/L),速率常数为0.14 min^(-1);在10 W可见光照射下的速率常数可达0.084 min^(-1)。此外,Ga_(2)O_(3)-Ag催化剂对其他有机染料(MO、MB、MV和RhB,10 mg/L)也表现出良好的光降解活性。紫外可见漫反射光谱、光电流瞬态响应和光致荧光发光光谱等测试结果表明,Ag负载增强了Ga_(2)O_(3)催化剂对可见光的吸收能力,提高了光生载流子的分离效率,进而显著提升了光催化性能。 展开更多
关键词 Ga_(2)O_(3)半导体 贵金属沉积 光催化 有机染料降解 异质结
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n-Ga_(2)O_(3)/p-GaAs异质结日盲紫外探测器制备
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作者 党新明 焦腾 +5 位作者 陈沛然 于含 韩宇 李震 李轶涵 董鑫 《发光学报》 EI CAS CSCD 北大核心 2024年第3期476-483,共8页
采用金属有机化学气相沉积(MOCVD)工艺在p-GaAs(100)衬底上外延了Ga_(2)O_(3)薄膜并制备了n-Ga_(2)O_(3)/p-GaAs异质结日盲紫外探测器。通过X射线衍射仪、原子力显微镜、场发射扫描电子显微镜等方法对Ga_(2)O_(3)薄膜表面形貌、晶体质... 采用金属有机化学气相沉积(MOCVD)工艺在p-GaAs(100)衬底上外延了Ga_(2)O_(3)薄膜并制备了n-Ga_(2)O_(3)/p-GaAs异质结日盲紫外探测器。通过X射线衍射仪、原子力显微镜、场发射扫描电子显微镜等方法对Ga_(2)O_(3)薄膜表面形貌、晶体质量进行了测试与分析。结果表明,Ga_(2)O_(3)薄膜呈单一晶向,薄膜表面平整且为Volmer-Weber模式外延。测试表明,n-Ga_(2)O_(3)/p-GaAs异质结探测器具有明显的整流特性。器件在5 V反向偏压和紫外光(254 nm)照射下实现了超过3.0×10^(4)的光暗电流比、7.0 A/W的响应度、3412%的外量子效率、4.6×10^(13)Jones的探测率。我们利用TCAD软件对器件结构进行仿真,得到了器件内的电场分布和能带结构,并分析了器件的工作原理。该异质结探测器性能较好,制造工艺简单,为Ga_(2)O_(3)超灵敏日盲紫外探测器的研制提供了新途径。 展开更多
关键词 氧化镓 金属有机化学气相沉积 异质结 日盲紫外探测器
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p-Si/n-Ga_(2)O_(3)异质结制备与特性研究
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作者 陈沛然 焦腾 +6 位作者 陈威 党新明 刁肇悌 李政达 韩宇 于含 董鑫 《人工晶体学报》 北大核心 2024年第1期73-81,共9页
本实验采用金属有机化学气相沉积(MOCVD)工艺,在p(111)型Si衬底上制备了p-Si/n-Ga_(2)O_(3)结构的PN结。通过X射线衍射仪、原子力显微镜等对样品进行了晶体结构、表面形貌、表面粗糙度等的表征分析;通过磁控溅射与蒸镀方法在样品上生长T... 本实验采用金属有机化学气相沉积(MOCVD)工艺,在p(111)型Si衬底上制备了p-Si/n-Ga_(2)O_(3)结构的PN结。通过X射线衍射仪、原子力显微镜等对样品进行了晶体结构、表面形貌、表面粗糙度等的表征分析;通过磁控溅射与蒸镀方法在样品上生长Ti/Au电极并进行I-V特性曲线、开启电压、开关电流比、反向饱和电流、理想因子、零偏压下的势垒高度等结特性测试,研究了掺杂浓度与薄膜厚度对PN结特性的影响,并对其原因进行了分析;通过二步生长法和缓冲层温度优化实验,减少了Si衬底与β-Ga_(2)O_(3)之间的晶格失配与热失配带来的影响,对薄膜与器件特性进行了优化。最终获得了表面粗糙度最低可达到4.21 nm的高质量n型β-Ga_(2)O_(3)薄膜,以及具有较低理想因子(42.1)的PN结。 展开更多
关键词 β-Ga_(2)O_(3)薄膜 金属有机化学气相沉积 p-Si/n-Ga_(2)O_(3) PN结 晶体质量 电学特性
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Plasmon Assisted Highly Efficient Visible Light Catalytic CO_(2) Reduction Over the Noble Metal Decorated Sr-Incorporated g-C_(3)N_(4) 被引量:6
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作者 Muhammad Humayun Habib Ullah +4 位作者 Lang Shu Xiang Ao Asif Ali Tahir Chungdong Wang Wei Luo 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第12期416-433,共18页
The photocatalytic performance of g-C_(3)N_(4) for CO_(2) conversion is still inadequate by several shortfalls including the instability,insu cient solar light absorption and rapid charge carrier's recombination r... The photocatalytic performance of g-C_(3)N_(4) for CO_(2) conversion is still inadequate by several shortfalls including the instability,insu cient solar light absorption and rapid charge carrier's recombination rate. To solve these problems,herein,noble metals(Pt and Au)decorated Sr-incorporated g-C_(3)N_(4) photocatalysts are fabricated via the simple calcination and photo-deposition methods. The Sr-incorporation remarkably reduced the g-C_(3)N_(4) band gap from 2.7 to 2.54 eV,as evidenced by the UV–visible absorption spectra and the density functional theory results. The CO_(2) conversion performance of the catalysts was evaluated under visible light irradiation. The Pt/0.15 Sr-CN sample produced 48.55 and 74.54 μmol h-1 g-1 of CH_(4) and CO,respectively.These amounts are far greater than that produced by the Au/0.15 Sr-CN,0.15 Sr-CN,and CN samples. A high quantum e ciency of 2.92% is predicted for the Pt/0.15 Sr-CN sample. Further,the stability of the photocatalyst is confirmed via the photocatalytic recyclable test. The improved CO_(2) conversion performance of the catalyst is accredited to the promoted light absorption and remarkably enhanced charge separation via the Sr-incorporated mid gap states and the localized surface plasmon resonance e ect induced by noble metal nanoparticles.This work will provide a new approach for promoting the catalytic e ciency of g-C_(3)N_(4) for e cient solar fuel production. 展开更多
关键词 g-C_(3)N_(4) Sr-incorporation Noble metal deposition Density functional theory Energy applications
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Interface Engineering via Ti_(3)C_(2)T_(x) MXene Electrolyte Additive toward Dendrite-Free Zinc Deposition 被引量:9
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作者 Chuang Sun Cuiping Wu +2 位作者 Xingxing Gu Chao Wang Qinghong Wang 《Nano-Micro Letters》 SCIE EI CAS CSCD 2021年第6期95-107,共13页
Zinc metal batteries have been considered as a promising candidate for next-generation batteries due to their high safety and low cost.However,their practical applications are severely hampered by the poor cyclability... Zinc metal batteries have been considered as a promising candidate for next-generation batteries due to their high safety and low cost.However,their practical applications are severely hampered by the poor cyclability that caused by the undesired dendrite growth of metallic Zn.Herein,Ti_(3)C_(2)T_(x) MXene was first used as electrolyte additive to facilitate the uniform Zn deposition by controlling the nucleation and growth process of Zn.Such MXene additives can not only be absorbed on Zn foil to induce uniform initial Zn deposition via providing abundant zincophilic-O groups and subsequently participate in the formation of robust solid-electrolyte interface film,but also accelerate ion transportation by reducing the Zn^(2+) concentration gradient at the electrode/electrolyte interface.Consequently,MXene-containing electrolyte realizes dendrite-free Zn plating/striping with high Coulombic efficiency(99.7%)and superior reversibility(stably up to 1180 cycles).When applied in full cell,the Zn-V_(2)O_(5)cell also delivers significantly improved cycling performances.This work provides a facile yet effective method for developing reversible zinc metal batteries. 展开更多
关键词 Zinc metal batteries Ti_(3)C_(2)T_(x)MXene Electrolyte additive Uniform Zn deposition
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A 3D conducting scaffold with in-situ grown lithiophilic Ni_(2)P nanoarrays for high stability lithium metal anodes 被引量:2
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作者 Huai Jiang Hailin Fan +6 位作者 Zexun Han Bo Hong Feixiang Wu Kai Zhang Zhian Zhang Jing Fang Yanqing Lai 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第3期301-309,共9页
Lithium(Li)metal is the most potential anode material for the next-generation high-energy rechargeable batteries.However,intrinsic surface unevenness and‘hostless’nature of Li metal induces infinite volume effect an... Lithium(Li)metal is the most potential anode material for the next-generation high-energy rechargeable batteries.However,intrinsic surface unevenness and‘hostless’nature of Li metal induces infinite volume effect and uncontrollable dendrite growth.Herein,we design the in-situ grown lithiophilic Ni_(2)P nanoarrays inside nickel foam(PNF).Uniform Ni_(2)P nanoarrays coating presents a very low nucleation overpotential,which induces the homogeneous Li deposition in the entire spaces of three-dimensional(3D)metal framework.Specifically,the lithiophilic Ni_(2)P nanoarrays possess characteristics of electrical conductivity and structural stability,which have almost no expansion and damage during repeating Li plating/stripping.Therefore,they chronically inhibit the growth of Li dendrites.This results in an outstanding Coulombic efficiency(CE)of 98% at 3 mA cm^(-2) and an ultra long cycling life over 2000 cycles with a low overpotential.Consequently,the PNF-Li||LiFePO_(4) battery maintains a capacity retention of 95.3% with a stable CE of 99.9% over 500 cycles at 2 C. 展开更多
关键词 Li metal anodes Ni_(2)P nanoarrays 3D metal framework Uniform Li deposition Superior lithiophilicity
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核电用ERNiCrMo-3熔敷金属组织及力学性能研究
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作者 唐雪 玉昆 +3 位作者 蒋力 叶祥熙 徐长征 李志军 《电焊机》 2021年第7期43-49,I0005,共8页
对采用钨极氩弧焊方法(GTAW)获得的ERNiCrMo-3焊丝熔敷金属进行微观组织表征及力学性能测试。结果表明,熔敷金属微观组织由粗大的柱状晶组成,不同柱状晶内分布树枝晶、等轴晶等亚晶,枝晶间析出Laves相、NbC/TiN和针状δ相;在熔敷金属厚... 对采用钨极氩弧焊方法(GTAW)获得的ERNiCrMo-3焊丝熔敷金属进行微观组织表征及力学性能测试。结果表明,熔敷金属微观组织由粗大的柱状晶组成,不同柱状晶内分布树枝晶、等轴晶等亚晶,枝晶间析出Laves相、NbC/TiN和针状δ相;在熔敷金属厚度方向上,硬度从底部到顶部呈现逐渐减小的趋势。熔敷金属中多种析出相未对冲击及拉伸性能产生不利影响。 展开更多
关键词 ERnicrmo-3 熔敷金属 硬度 冲击性能 拉伸性能
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Fabrication of polyetheretherketone(PEEK)-based 3D electronics with fine resolution by a hydrophobic treatment assisted hybrid additive manufacturing method 被引量:3
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作者 Liexin Wu Li Meng +4 位作者 Yueyue Wang Ming Lv Taoyuan Ouyang Yilin Wang Xiaoyan Zeng 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2023年第3期519-532,共14页
Additive manufacturing(AM)is a free-form technology that shows great potential in the integrated creation of three-dimensional(3D)electronics.However,the fabrication of 3D conformal circuits that fulfill the requireme... Additive manufacturing(AM)is a free-form technology that shows great potential in the integrated creation of three-dimensional(3D)electronics.However,the fabrication of 3D conformal circuits that fulfill the requirements of high service temperature,high conductivity and high resolution remains a challenge.In this paper,a hybrid AM method combining the fused deposition modeling(FDM)and hydrophobic treatment assisted laser activation metallization(LAM)was proposed for manufacturing the polyetheretherketone(PEEK)-based 3D electronics,by which the conformal copper patterns were deposited on the 3D-printed PEEK parts,and the adhesion between them reached the 5B high level.Moreover,the 3D components could support the thermal cycling test from-55℃ to 125℃ for more than 100 cycles.Particularly,the application of a hydrophobic coating on the FDM-printed PEEK before LAM can promote an ideal catalytic selectivity on its surface,not affected by the inevitable printing borders and pores in the FDM-printed parts,then making the resolution of the electroless plated copper lines improved significantly.In consequence,Cu lines with width and spacing of only60μm and 100μm were obtained on both as-printed and after-polished PEEK substrates.Finally,the potential of this technique to fabricate 3D conformal electronics was demonstrated. 展开更多
关键词 PEEK fused deposition modeling hydrophobic treatment laser activation metallization integrated manufacturing of 3D electronics RESOLUTION
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Fabrication of Gd_(2)O_(3)-doped CeO_(2)thin films through DC reactive sputtering and their application in solid oxide fuel cells 被引量:3
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作者 Fuyuan Liang Jiaran Yang +1 位作者 Haiqing Wang Junwei Wu 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2023年第6期1190-1197,共8页
Physical vapor deposition(PVD)can be used to produce high-quality Gd_(2)O_(3)-doped CeO2(GDC)films.Among various PVD methods,reactive sputtering provides unique benefits,such as high deposition rates and easy upscalin... Physical vapor deposition(PVD)can be used to produce high-quality Gd_(2)O_(3)-doped CeO2(GDC)films.Among various PVD methods,reactive sputtering provides unique benefits,such as high deposition rates and easy upscaling for industrial applications.GDC thin films were successfully fabricated through reactive sputtering using a Gd_(0.2)Ce_(0.8)(at%)metallic target,and their application in solid oxide fuel cells,such as buffer layers between yttria-stabilized zirconia(YSZ)/La0.6Sr0.4Co0.2Fe0.8O_(3−δ)and as sublayers in the steel/coating system,was evaluated.First,the direct current(DC)reactive-sputtering behavior of the GdCe metallic target was determined.Then,the GDC films were deposited on NiO-YSZ/YSZ half-cells to investigate the influence of oxygen flow rate on the quality of annealed GDC films.The results demonstrated that reactive sputtering can be used to prepare thin and dense GDC buffer layers without high-temperature sintering.Furthermore,the cells with a sputtered GDC buffer layer showed better electrochemical performance than those with a screen-printed GDC buffer layer.In addition,the insertion of a GDC sublayer between the SUS441 interconnects and the Mn-Co spinel coatings contributed to the reduction of the oxidation rate for SUS441 at operating temperatures,according to the area-specific resistance tests. 展开更多
关键词 solid oxide fuel cell physical vapor deposition Gd2O3-doped CeO_(2) metallic interconnects electrical conductivity
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Ni/CeO_2-Al_2O_3催化剂上CH_4-CO_2转化积炭性能的研究 被引量:21
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作者 杨咏来 徐恒泳 李文钊 《高等学校化学学报》 SCIE EI CAS CSCD 北大核心 2002年第11期2112-2116,共5页
采用脉冲微量反应技术研究了添加 n型半导体氧化物 Ce O2 对 Ni基催化剂上 CH4积炭 /CO2 消炭性能的影响 ,用 TPR,XPS和氢吸附技术对催化剂进行了表征 .结果表明 ,活性金属原子 Ni与半导体氧化物Ce O2 之间存在金属 -半导体相互作用 ( M... 采用脉冲微量反应技术研究了添加 n型半导体氧化物 Ce O2 对 Ni基催化剂上 CH4积炭 /CO2 消炭性能的影响 ,用 TPR,XPS和氢吸附技术对催化剂进行了表征 .结果表明 ,活性金属原子 Ni与半导体氧化物Ce O2 之间存在金属 -半导体相互作用 ( MSc I) ,Ce O2 的添加提高了活性原子 Ni0的 d电子密度 ,在一定程度上抑制了 CH4分子中 C—Hσ电子向 d轨道的迁移 ,降低了 CH4裂解积炭活性 ;可加强 Ni0原子 d轨道向CO2 空反键 π轨道的电子迁移 ,促进 CO2 分子的活化 ,提高 CO2 的消炭活性 ,使 Ni/Ce O2 -Al2 O3 催化剂具有较强的抗积炭性能 . 展开更多
关键词 Ni/CeO2-Al2O3催化剂 金属-半导体相互作用 金属-载体相互作用 CH4 积炭 CO2 消炭 氧化铈 氧化铝 载体 合成气 甲烷 二氧化碳
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Ni/γ-Al_2O_3中助剂的加入对于CH_4/CO_2重整反应性能的影响 被引量:11
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作者 钱岭 阎子峰 袁安 《燃料化学学报》 EI CAS CSCD 北大核心 2001年第z1期90-92,共3页
以含量为 2 %的K、Cu、La、Mg、Ca、Ba、Mo、Ce等多种金属作为助剂分别加入Ni/γ Al2 O3 催化剂样品中 ,并对其分别用于CH4 /CO2 重整反应时的活性和积碳量进行了考察。研究结果表明 :加入助剂后的各种催化剂的活性变化不一。其中 ,以... 以含量为 2 %的K、Cu、La、Mg、Ca、Ba、Mo、Ce等多种金属作为助剂分别加入Ni/γ Al2 O3 催化剂样品中 ,并对其分别用于CH4 /CO2 重整反应时的活性和积碳量进行了考察。研究结果表明 :加入助剂后的各种催化剂的活性变化不一。其中 ,以含Ca的催化剂效果最好 ,其甲烷的转化率可由原来的 71 91%增加到 72 92 % ,其次为La。但所有加入助剂后的催化剂的抗积碳性能均有所提高 ,特别是碱金属K的添加 ,使催化剂表面积碳量降到了 0 1%。这表明添加碱金属或碱土金属助剂 ,对提高Ni/γ Al2 O3 催化剂在CH4 /CO2 展开更多
关键词 碱金属 碱土金属 助剂 NI/Γ-AL2O3催化剂 CH4/CO2重整反应 积碳
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过渡金属改性钒钨钛催化剂的制备及脱硝性能研究
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作者 孙权 秦云 +3 位作者 胡杰 张勇 黄鑫怡 徐兵 《工业安全与环保》 2024年第8期77-81,共5页
采用化学气相沉积法对浸渍法制备的V_(2)O_(5)-WO_(3)/TiO_(2) 催化剂进行过渡金属改性,考察Cu、Mn、Cr等过渡金属对催化剂脱硝性能的影响,确定最优的过渡金属,并考察过渡金属负载量对脱硝性能的影响。结果表明:Cr改性V_(2)O_(5)-WO_(3)... 采用化学气相沉积法对浸渍法制备的V_(2)O_(5)-WO_(3)/TiO_(2) 催化剂进行过渡金属改性,考察Cu、Mn、Cr等过渡金属对催化剂脱硝性能的影响,确定最优的过渡金属,并考察过渡金属负载量对脱硝性能的影响。结果表明:Cr改性V_(2)O_(5)-WO_(3)/TiO_(2) 催化剂的催化性能最佳,催化剂活性温度区间由280~340℃降至250~310℃,提高了催化剂的低温脱硝活性。对催化剂进行XRD和SEM表征分析,CuO_(x)、Mn O_(x)、CrO_(x)等金属氧化物高度分散于试样的表面,对催化剂的结晶形态无明显的影响。1%Cr与5%Cr负载量改性的催化剂粒径尺寸小,几乎没有出现颗粒集聚现象,表面相对平整光滑,分布比较均匀,提高了NH_(3)-SCR的活性。其中1%C_(r)-V_(2)O_(5)-WO_(3)/TiO_(2) 催化剂在280℃时,NO_(x)转化率达到97.51%,显著提高催化剂低温脱硝性能。 展开更多
关键词 钒钨钛催化剂 过渡金属 化学气相沉积 脱硝性能
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基于3DMine软件的多金属矿山不同露天开采境界优化方法的对比 被引量:8
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作者 狄长江 戴晓江 宇文巍 《黄金》 CAS 2015年第8期31-35,共5页
境界优化是露天矿山开采设计的主要内容之一。对于多金属矿山露天开采境界圈定时,会有不同的境界圈定方法。以某锡锌多金属矿为工程背景,利用3DMine软件分别以不同的方法进行境界圈定,并综合考虑矿山资源状况、开采技术条件、矿产品销... 境界优化是露天矿山开采设计的主要内容之一。对于多金属矿山露天开采境界圈定时,会有不同的境界圈定方法。以某锡锌多金属矿为工程背景,利用3DMine软件分别以不同的方法进行境界圈定,并综合考虑矿山资源状况、开采技术条件、矿产品销售价格、矿石开采及处理成本等多种因素,得出实现经济效益最大化的境界。结果显示,对于矿石品位已知的矿山,利用以品位计算价值比以矿石类型计算价值更合理;对于多金属主元素含量与伴生有益组含量差距比较大时,利用当量品位计算价值比以多金属品位单独赋值计算价值更合理。 展开更多
关键词 3Dmine软件 多金属矿床 境界优化 当量品位 圈定方法
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3DPMD-Arc-based additive manufacturing with titanium powder as raw material 被引量:12
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作者 Hoefer Kevin Mayr Peter 《China Welding》 EI CAS 2019年第1期11-15,共5页
The study aims to demonstrate the suitability of the 3DPMD for the production of titanium components with and without reinforcing particles in layer-by-layer design. Various demonstrators are prepared and analyzed. Th... The study aims to demonstrate the suitability of the 3DPMD for the production of titanium components with and without reinforcing particles in layer-by-layer design. Various demonstrators are prepared and analyzed. The microstructure, the porosity and the hardness values of the different structures are compared with each other through metallographic cross-sections. The uniform distribution of the carbides and the interaction with the matrix was analyzed by SEM and EDX.The miller-test method(ASTM G75-07) was used to determine data for the relative abrasivity of the structures. In summary, 3DPMD offers the possibility to produce titanium structures with and without reinforced particles. Using automated routines, it is possible to generate metal structures using welding robots directly from the CAD drawings. Microstructures and properties are directly related to the process and therefore material-process-property relationships are discussed within this work. 展开更多
关键词 ADDITIVE manufacturing PLASMA TITANIUM 3D PLASMA metal depositION REINFORCED PARTICLES
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原子层沉积金属氧化物层对Pt/Al_(2)O_(3)催化剂三效催化活性和热稳定性的影响 被引量:1
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作者 何泽源 朱雨菲 +5 位作者 张桂臻 李淑贞 杨晓栋 邱文革 戴洪兴 何洪 《工业催化》 CAS 2022年第6期46-52,共7页
高温热稳定性的提高是车用三效催化剂目前面临的主要挑战之一。利用原子层沉积技术(ALD)在新鲜Pt/Al_(2)O_(3)催化剂上分别沉积了CeO_(2)、TiO_(2)和La_(2)O_(3)薄层,采用X射线衍射、透射电子显微镜、氮气低温吸附-脱附和氢气程序升温... 高温热稳定性的提高是车用三效催化剂目前面临的主要挑战之一。利用原子层沉积技术(ALD)在新鲜Pt/Al_(2)O_(3)催化剂上分别沉积了CeO_(2)、TiO_(2)和La_(2)O_(3)薄层,采用X射线衍射、透射电子显微镜、氮气低温吸附-脱附和氢气程序升温还原等对催化剂的物理化学性质进行表征,研究沉积氧化物薄层对Pt/Al_(2)O_(3)催化剂三效催化反应活性和热稳定性的影响。结果表明,沉积CeO_(2)、TiO_(2)和La_(2)O_(3)薄层可以提高催化剂性能,还能抑制Pt纳米粒子在800℃和10 h老化过程中聚集长大。在CeO_(2)、TiO_(2)和La_(2)O_(3)修饰的催化剂中,Pt/Al_(2)O_(3)@TiO_(2)催化剂具有最好的三效催化活性和热稳定性。 展开更多
关键词 催化化学 原子层沉积 金属氧化物层 Pt/Al_(2)O_(3)催化剂 三效催化活性 热稳定性
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A flexible artificial solid-electrolyte interlayer supported by compactness-tailored carbon nanotube network for dendrite-free lithium metal anode 被引量:1
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作者 Haowen Liu Jifang Zhang +9 位作者 Yang Liu Yang Wei Shuaiyang Ren Ludi Pan Yi Su Jianhua Xiao Haiyan Fan Yitao Lin Yipeng Su Yuegang Zhang 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2022年第6期421-427,I0012,共8页
A dendrite-free lithium metal anode requires a stable interface designed for efficient and reversible lithium plating and stripping. In this work, we have devised a mechanically flexible artificial Li_(3)N solid-elect... A dendrite-free lithium metal anode requires a stable interface designed for efficient and reversible lithium plating and stripping. In this work, we have devised a mechanically flexible artificial Li_(3)N solid-electrolyte interlayer supported by a dual-layer compactness-tailored carbon nanotube fiber network. The more compact side of the network ensures a full coverage of Li_(3)N, which prevents the reaction between electrolyte and lithium. The other side, with sparsely distributed nanotube fibers, provides mechanical flexibility for the film, and induces three-dimensional lithium deposition along its structure without any dendrite formation. The resulting full cell with NCM811 cathode has a high capacity retention of 95.1% for 160 cycles compared with less than 80% for the control. 展开更多
关键词 Lithium metal anode Artificial SEI CNT network 3D deposition
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Strongly enhanced flux pinning in the YBa_2Cu_3O_(7-X) films with the co-doping of Ba TiO_3 nanorod and Y_2O_3 nanoparticles at 65 K 被引量:1
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作者 王洪艳 丁发柱 +1 位作者 古宏伟 张腾 《Chinese Physics B》 SCIE EI CAS CSCD 2015年第9期497-501,共5页
YBa2Cu3O7-x(YBCO) films with co-doping BaTiO3(BTO) and Y2O3 nanostructures were prepared by metal organic deposition using trifluoroacetates(TFA-MOD). The properties of the BTO/Y2O3co-doped YBCO films with diffe... YBa2Cu3O7-x(YBCO) films with co-doping BaTiO3(BTO) and Y2O3 nanostructures were prepared by metal organic deposition using trifluoroacetates(TFA-MOD). The properties of the BTO/Y2O3co-doped YBCO films with different excess yttrium have been systematically studied by x-ray diffraction(XRD), Raman spectra, and scanning electron microscope(SEM). The optimized content of yttrium excess in the BTO/Y2O3co-doped YBCO films is 10 mol.%, and the critical current density is as high as - 17 mA/cm^2(self-field, 65 K) by the magnetic signal. In addition, the Y2Cu2O5 was formed when the content of yttrium excess increases to 24 mol.%, which may result in the deterioration of the superconducting properties and the microstructure. The unique combination of the different types of nanostructures of BTO and Y2O3 in the doped YBCO films, compared with the pure YBCO films and BTO doped YBCO films, enhances the critical current density(JC) not only at the self-magnetic field, but also in the applied magnetic field. 展开更多
关键词 YBa2Cu3O7-x(YBCO) film flux pinning BaTiO3(BTO) and Y2O3 nanostructures metal organic deposition using trifluoroacetates(TFA-MOD
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