检索结果-南通市图书馆

Improvement in the liquid zinc corrosion resistance of high Nb-TiAl alloys by pre-oxidation in a SiO_2-powder pack

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2012年第2期55卷 505-509页

作者： SUN PengFei zhang laiqi zhang Li LIN JunPin State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

The influence of pre-oxidation on the liquid zinc corrosion resistance of high Nb-TiAl alloys was investigated. The pre-oxidation was performed by heating the specimens, buried in silica powder and encapsulated in a silica tube under a vacuum of 1.3x10-5 Pa at 950℃ for 12 h. Experimental results showed that the preoxidized sample exhibited much higher liquid zinc corrosion resistance than that for the comparative samples. This excellent liquid zinc corrosion resistance was attributed to the formation of high-quality oxide scale during peroxidation. The corrosion of all the samples in liquid zinc was caused by a localized breakdown in the oxide scales. The continuous and dense oxide scale formed during preoxidation substantially may prevent the liquid zinc from diffusing to the substrate, and its good continuity may also reduce the possibility of localized breakdown in the oxide scale.

关键词： liquid zinc corrosion preoxidation TiAI-Nb intermetallic compound

Through converting the surface complex on TiO_(2) nanorods to generate superoxide and singlet oxygen to remove CN^(−)

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2023年第2期124卷 300-309页

作者： laiqi zhang Ridha Djellabi Peidong Su Yan Wang Jianling Zhao School of Materials Science and Engineering Hebei University of TechnologyTianjin 300401China Key Laboratory of Drinking Water Science and Technology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Dip.Chimica and INSTM-UdR Milano Universitàdegli Studi di MilanoVia Golgi1920133 MilanoItaly

Cyanide(CN−)is extensively used in the process of plating devices and for surface treatment in the electroplating industry and is extremely hazardous to humans and the ***(PMS)-based advanced oxidation processes(AOPs)hold considerable promise for CN−***,the activity of sulfate radical and hydroxyl radical generated in the PMS activation process is low in the base condition,leading to a drop in its efficiency in CN−***,a photo-electrocatalytic system(PEC),developed using a TiO_(2) photoanode and a carbon aerogel cathode,was used to activate PMS for the removal of CN−from wastewater through the generation of radicals and *** PEC/PMS system could effectively remove CN^(−),with the removal efficiency reaching 98.5%within 2 min,when PMS concentration was at the 0.25 mmol/L level,and the applied bias voltage was-0.5 *** main active species in the PEC/PMS system were superoxide radicals and singlet oxygen,which was proved through electron paramagnetic resonance detection and quenching *** obtained through in-situ Raman measurements,photocurrent tests,and electrochemical impedance spectroscopy measurements indicated that the TiO2 could activate PMS to generate active *** many cycles of experimentation,it was discovered that the system displayed high catalytic performance and possessed satisfactory stability to remove CN−economically and efficiently.

关键词： TiO_(2) Photo-electrocatalytic Peroxymonosulfate activation Cyanide removal Water remediation

Characterization of the Trace Phosphorus Segregation and Mechanical Properties of Dual-Phase Steels

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2022年第2期35卷 341-352页

作者： Jing Wang Wei Li Xiaodong Zhu Li You laiqi zhang State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering University of Shanghai for Science and TechnologyShanghai 200093China Research Institute Baoshan Iron&Steel Co.LtdShanghai 201999China State Key Laboratory of Development and Application Technology of Automotive Steels(Baosteel) Shanghai 201999China

The segregation behavior of trace amount of phosphorus(P)and the mechanical properties of dual-phase(DP)steels have been systematically *** microstructure of DP steels is mainly composed of martensite,ferrite and nanoscale *** the DP steels with diff erent trace amounts of P(≤0.015 wt%),P has almost no effect on the mechanical *** probe technology(APT)analyses confirm that P segregation was only found at the precipitate/matrix ***,the precipitates of(Ti,Mo)C are widely distributed in the ferrite,martensite and ferrite/martensite interface *** special segregation feature of P would not concentrate at specific regions such as ferrite/martensite interface and/or martensite lath interface,which reveals that trace amounts of P(≤0.015 wt%)have almost no effect on the mechanical properties of DP *** is proved for the first time that the MC-type carbides of(Ti,Mo)C can reduce or eliminate the damage effect of P on the mechanical properties of steels,which provides a new way for the design of alloys to reduce P *** work will promote to increase the P content control standard in DP steels from 0.01 to 0.015 wt%,which will not change the mechanical properties,but greatly reduce the scrap rate and increase the energy e fficiency of the manufacturing process.

关键词： Phosphorus Segregation Carbide Mechanical properties Atom probe tomography Dual-phase steels

Microstructure Evolution and Pore Formation Mechanism of Porous TiAl3 Intermetallics via Reactive Sintering

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2018年第4期31卷 440-448页

作者： Xinyang Jiao Xiaohong Wang Peizhong Feng Yanan Liu laiqi zhang Farid Akhtar School of Materials Science and Engineering China University of Mining and TechnologyXuzhou 221116People's Republic of China School of Chemical Engineering and Technology China University of Mining and TechnologyXuzhou 221116People's Republic of China State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing100083People's Republic of China Division of Materials Science Lulefi University of Technology97187 LulJtSweden

Porous TiAl3 intermetallics were fabricated through vacuum reactive sintering from Ti-75A1 at.% elemental powder *** phase compositions,expansion behaviors,pore characteristics and microstructure evolution of TiAl3 intermetallics were investigated,and the pore formation mechanism was also *** was found that the actual temperature of compacts showed an acute climb from 668 to 1244℃ in 166s,while the furnace temperature maintained the linear growth of 5℃/min,which indicated that an obvious thermal explosion（TE）reaction occurred during sintering,and only single-phase TiA13 intermetallic was synthesized in TE *** open porosity increased from 22.2（green compact）to 32.8% after reactive diffusion sintering at 600℃ and rised to 58.7% after TE,then decreased to 51.2% after high-temperature homogenization at 1100℃.Therefore,TE reaction is the dominated pore formation mechanism of porous TiAl3 *** pore evolution in porous TiAl3 intermetallics occurred by the following mechanisms：certain intergranular pores remained among powder particles of green compact,then low-temperature sintering resulted in a further increase in porosity due to the Kirkendall ***,TE reaction gave rise to a dramatic volume expansion because of the rapid increase in temperature,and high-temperature sintering caused densification and a slight shrinkage.

关键词： Intermetallics Porous materials Powder metallurgy Reaction synthesis Thermal explosionsynthesis

A review of novel ternary nano-layered MAX phases reinforced AZ91D magnesium composite

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第6期10卷 1457-1475页

作者： Wantong Chen Wenbo Yu Chaosheng Ma Guozheng Ma laiqi zhang Haidou Wang Center of Materials Science and Engineering School of Mechanical and Electronic Control EngineeringBeijing Jiaotong UniversityBeijing 100044China National Key Lab for Remanufacturing Army Academy of Armored ForcesBeijing 100072China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing100083China

In recent decades, the demand for lightweight and high specific strength materials brings about the development of magnesium matrix composites. Different from some traditional binary ceramic particles, such as SiC, Al_(2)O_(3), the novel ternary nano-layered M_(n+1)AX_(n)(MAX)phase carbide or nitride ceramics exhibit metal-like properties and self-lubricate capacity(where “M” is an early transition metal, “A” belongs to the group A element, “X” is C or/and N, and n = 1–3). Ti_(2)AlC, as the representative of the MAX phase, was interestingly introduced into the magnesium matrix. Layered Ti_(2)AlC MAX phased reinforced AZ91D magnesium composites manufactured through the stir casting exhibit sufficient deformation capacity due to unique deformation behaviors of MAX, namely delamination and the formation of kinking band. Further,the Ti_(2)AlC-AZ91D composites exhibit a distinctive characteristic in strengthening mechanism, damping mechanism and tribological capacity due to the other special properties of MAX phase, such as self-lubricated property. Accordingly, to give a comprehensive understanding, we overviewed the fabrication process, microstructural characterization, mechanical properties, damping property and tribological capacity on these composites. In order to understand the A-site effect in MAX phase on the microstructure, we introduced another representative Ti_(3)SiC_(2)MAX phase to explain the interfacial evolution. In addition, due to the high aspect ratio of MAX, MAX particles could be orientationally regulated in Mg matrix by plastic deformation such as hot extrusion. Herein, we discussed the anisotropic mechanical and physical properties of the textured composites produced by hot extrusion. Moreover, the potential applications and future development trends of MAX phases reinforced magnesium matrix composites were also given and prospected.

关键词： Ternary MAX phases Magnesium composite Damping Mechanical properties Anisotropic Tribological capacity

Distribution behavior of inclusions in compact-strip-produced martensitic steel and its influence on mechanical properties

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2023年第11期142卷 98-111页

作者： Jing Wang Peng Xue laiqi zhang Li You Xiaodong Zhu Shuize Wang Yong Zhong Xinping Mao State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China Research Institute Baoshan Iron&Steel Co.LtdShanghai 201999China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China

The distribution behavior of inclusions in martensitic steel produced by compact strip production process(CSP-MS)and its influence on mechanical properties were systematically *** inclusions in the CSP-MS specimen are mainly composed of spherical Al_(2)O_(3)-CaO-CaS,MnS with high aspect ratio and small-sized TiN,whereas many coarse cuboidal TiN inclusions do exist in conventional martensitic steel(Con-MS).The high inclusion density of the CSP-MS specimen resulted in lower total elongation and impact toughness,and the MnS inclusions with high aspect ratio led to significantly stronger mechanical anisotropy than that for Con-MS *** in-situ tensile results indicated that when the fracture direction is parallel to MnS direction,the microcracks induced by MnS inclusions tend to propagate into the matrix,leading to the formation of valley-like features,which significantly deteriorate the properties such as the total elongation and impact *** microcracks caused by TiN inclusions are sharper than those caused by spherical Al_(2)O_(3)-CaO-CaS inclusions,and are easy to propagate into the *** work is expected to guide the optimization of the mechanical properties of martensitic steels produced by CSP process and provide a theoretical basis for the CSP process design.

关键词： Martensitic steel Compact strip production Inclusion distribution behavior Mechanical properties In-situ tensile test

Oxidation behavior of Mo-Si-B alloys at medium-to-high temperatures

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 Materials Science & Technology 2021年第1期60卷 113-127页

作者： Kunming Pan Yanping Yang Shizhong Wei Honghui Wu Zhili Dong Yuan Wu Shuize Wang laiqi zhang Junping Lin Xinping Mao Henan Key Laboratory of High-temperature Structural and Functional Materials National Joint Engineering Research Center for Abrasion Control and Molding of Metal MaterialsHenan University of Science and TechnologyLuoyang 471003China Beijing Advanced Innovation Center for Materials Genome Engineering University of Science and Technology BeijingBeijing 100083China School of Materials Science and Engineering Nanyang Technological UniversitySingapore State Key Laboratory for Advanced Metals and Materials University of Science and Technology BeijingBeijing 100083China

Continuous exploration of high-temperature structural materials is being driven by the needs of gasturbine engines capable of withstanding the high-temperature *** low melting points of currently applied superalloys restrain the further improvement of service tempe *** higher melting tempe ratures above 2000℃,Mo-Si-B alloys are regarded as a new generation of ultrahightemperature structural ***,oxidation is a concern for the industrial application of Mo-Si-B ***,an in-depth understanding of the oxidation mechanisms may contribute to solving this issue,whereas relevant reviews about their recent advances are *** the current work,a comprehensively systematic review about the oxidation behaviors of Mo-Si-B alloys is described for this purpose.

关键词： Mo-Si-B alloys Oxidation resistance Alloying and modification Enhancement

Effect of heat treatment on mechanical properties of heavily cold-rolled Fe-6.5wt%Si alloy sheet

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2010年第4期53卷 1008-1011页

作者： LIANG YongFeng,YE Feng,LIN JunPin,WANG YanLi,zhang laiqi & CHEN GuoLiang State Key Laboratory for Advanced Metals and Materials,University of Science and Technology Beijing,Beijing 100083,China State Key Laboratory for Advanced Metals and Materials University of Science and Technology Beijing Beijing China

Fe-6.5wt%Si alloy has excellent soft magnetic properties,but it is hard to be cold-rolled due to appearance of ordered phases in this *** this paper we report that ultra thin Fe-6.5wt%Si sheet of 0.05 mm thick was obtained by heavily cold *** means of optical microscope,micro-hardness indenter,instron,SEM and X-ray diffraction,the effect of heat treatment on mechanical properties of this alloy sheet was *** heavily cold-rolled sheet exhibits some extent of *** ultimate tensile strength reaches 1.93 *** heat treatment,micro-hardness is decreased and the ductility is lost,especially at temperature above 650℃ when recrystallization takes *** reason for decreasing the ductility lies in the ordered DO3 phase transformation.

关键词： Fe-6.5wt%Si alloy cold rolling heat treatment microstructure mechanical properties

原位合成MoSi_2-SiC复合材料700℃的氧化行为

在线全文

学校读者我要写书评

暂无评论

材料研究学报 2015年第8期29卷 561-568页

作者：张来启段立辉林均品北京科技大学新金属材料国家重点实验室北京100083

研究了不同SiC体积分数原位合成MoSi2-SiC复合材料在700℃空气中1000h的长期氧化行为。结果表明:复合材料氧化1000h后,均未发生pest现象。复合材料的氧化抗力明显好于单一MoSi2,原位合成复合材料的氧化抗力好于传统的热压商用MoSi2粉末... 详细信息

研究了不同SiC体积分数原位合成MoSi2-SiC复合材料在700℃空气中1000h的长期氧化行为。结果表明:复合材料氧化1000h后,均未发生pest现象。复合材料的氧化抗力明显好于单一MoSi2,原位合成复合材料的氧化抗力好于传统的热压商用MoSi2粉末和SiC粉末混合物制备的复合材料(外加复合材料)。复合材料氧化膜相组成仅为非晶SiO2,材料的氧化过程主要是O2与MoSi2的作用,SiC未发生氧化。材料在700℃下仍发生硅、钼的同时氧化,因MoO3的挥发较快没有晶须形成,因而在材料表面快速形成一薄层连续、致密的非晶SiO2保护膜,使材料表现出优异的长期抗氧化性。

关键词：材料失效与保护 MoSi2-SiC复合材料原位合成低温氧化行为 pest现象