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Progress of remanufacturing engineering and future technology expectation

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Advances in Manufacturing 2013年第1期1卷 8-12页

作者： bin-shi xu National Key Laboratory for Remanufacturing The Academy of Armored Forces Engineering

After development for decades, abroad remanufacturing has formed a complete industrial system. At present, the research emphases are on marking logistics management and market cultivation theory of remanufacturing products, and so on. The Chinese remanufacturing starts fairly late. After 10 years of development, it formed a remanufacturing mode with Chinese characteristics that is sustained by high-tech industries, using the surface engineering technology to restore the size and improve properties, and combining manufacturing, study and research together. The remanufacturing mode is not only circular but also economic. With the development of science and technology, future remanufacturing technology will break the previous limits, explore and understand the limits of micro machining. It will carry out the waste product remanufacturing in the micro-nano scale, and extend the remanufacturing industry to a more broad space.

关键词： Sustainable development Remanufacturingindustry - Surface engineering - Micro-nano machining

The Riemannian Manifolds with Boundary and Large Symmetry

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Chinese Annals of Mathematics,Series B 2010年第3期31卷 347-360页

作者： Zhi CHEN Yiqian shi bin xu Department of Mathematics University of Science and Technology of China Hefei 230026 China. Department of Mathematics University of Science and Technology of China Hefei 230026 China.

Seventy years ago, Myers and Steenrod showed that the isometry group of a Riemannian manifold without boundary has a structure of Lie group. In 2007, Bagaev and Zhukova proved the same result for a Riemannian orbifold. In this paper, the authors first show that the isometry group of a Riemannian manifold M with boundary has dimension at most 1/2 dim M（dim M - 1）. Then such Riemannian manifolds with boundary that their isometry groups attain the preceding maximal dimension are completely classified.

关键词： Riemannian manifold with boundary Isometry Rotationally symmetric metric Principal orbit

Enrichment of copper and recycling of cyanide from copper–cyanide waste by solvent extraction

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International Journal of Minerals,Metallurgy and Materials 2016年第11期23卷 1258-1263页

作者： Teng-yue Gao Kui-ren Liu Qing Han bin-shi xu Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of the Ministry of Education School of MetallurgyNortheastern University National Key laboratory for Remanufacturing Academy of Armored Forces Engineering

The enrichment of copper from copper–cyanide wastewater by solvent extraction was investigated using a quaternary ammonium salt as an extractant. The influences of important parameters, e.g., organic-phase components, aqueous pH values, temperature, inorganic anion impurities, CN/Cu molar ratio, and stripping reagents, were examined systematically, and the optimal conditions were determined. The results indicated that copper was effectively concentrated from low-concentration solutions using Aliquat 336 and that the extraction efficiency increased linearly with increasing temperature. The aqueous pH value and concentrations of inorganic anion impurities only weakly affected the extraction process when varied in appropriate ranges. The CN/Cu molar ratio affected the extraction efficiency by changing the distribution of copper–cyanide complexes. The difference in gold leaching efficiency between using raffinate and fresh water was negligible.

关键词： copper cyanide wastewater treatment solvent extraction copper recovery

Technology of self-repairing and reinforcement of metal worn surface

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Advances in Manufacturing 2013年第1期1卷 102-105页

作者： Yi xu Fei Gao Bo Zhang Feng Nan bin-shi xu National Key Laboratory for Remanufacturing The Academy of Armored Forces Engineering School of Materials Science and Engineering Shanghai Jiao Tong University

Researches on self-repairing material （serpentine phyllosilicate） of our team in the past few years, such as ultrafining treatment, surface modification, self-repairing mechanism, the effect of rare metal on the self-repairing performance of serpentine, were introduced summarily. The phyllosilicate of serpentine shows excellent tribologi- cal and self-repairing performance for metal worn surface as additive in lubricant.

关键词： Self-repairing performance - Self-repairingmechanism - Serpentine

Plasma transferred arc forming technology for remanufacture

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Advances in Manufacturing 2013年第2期1卷 187-190页

作者： Yao-Hui Lü Yu-Xin Liu Fu-Jia xu bin-shi xu Science and Technology on Remanufacturing Laboratory The Academy of Armored Forces Engineering

The plasma transferred arc （PTA） forming remanufacturing technology was introduced in this paper. This technology includes plasma surfacing, deposition and rapid forming technology. With self-developed plasma forming system, the thrust of engine cylinder body was remanufactured by PTA powder surfacing. In the concrete, the Nil5 alloy was deposited on the thrust face of the body in order to recover its dimension. In addition, the reman- ufacturing forming with Fe-based, Inconel 625 alloy was studied. The microstructure and hardness of the as-depos- ited materials were investigated.

关键词： Plasma transferred arc (PTA) Forming remanufacturing Microstructure Hardness

Research on automatic high velocity arc spraying technique and metastable coating materials

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Advances in Manufacturing 2013年第1期1卷 97-101页

作者： Xiu-bing Liang Yong-Xiong Chen Zhi-bin Zhang shi-Cheng Wei Yong-Ming Guo bin-shi xu National Engineering Research Center for Mechanical Product Remanufacturing The Academy of Armored Forces Engineering National Key Laboratory for Remanufacturing The Academy of Armored Forces Engineering College of Materials Science and Engineering Beijing University of Technology

Into the 21st century, remanufacturing engineering has been accepted by more and more people in China. Remanufacturing is an industrial maintenance technology for worn or waste electro-mechanical products using advanced technology, which means the high-level stage for the maintenance and surface engineering. In this paper, a new automotive high velocity arc spraying system was introduced. And three kinds of advanced amorphous and nanocrystalline metastable coatings were developed, including Fe, Ni and Al-based amorphous and nanocrystalline composite coatings. Their research development and applications were introduced. And the development trends of high velocity arc spraying system and advanced metastable surface protective coating materials on the remanu- facturing engineering were indicated.

关键词： Remanufacturing. Arc spraying. AmorphousNanocrystalline Coating

Tailoring microstructure evolution and mechanical properties of a high-performance alloy steel through controlled thermal cycles of a direct laser depositing process

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China Foundry 2021年第5期18卷 463-473页

作者： shi-yun Dong xuan Zhao shi-xing Yan Yao-hui Lü Xiao-ting Liu Yu-xin Liu Peng He bin-shi xu National Key Laboratory for Remanufacturing Army Academy of Armored ForcesBeijing 100072China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

Direct laser deposition(DLD),as a popular metal additive manufacturing process,shows advantages of technical flexibility and high efficiency to gain a high-performance alloy steel ***,during the processing of DLD,the deposited steel layer is affected by the subsequent layer *** DLD block shows different microstructure and mechanical properties at the bottom,middle and top of the deposited *** date,there are few research works about the effects of inter-layer interval time and laser power on the microstructure evolution and mechanical properties of the deposited *** this study,the idle time and laser power layer by layer during DLD of 12CrNi2 steel were controlled to cause the deposited layers to maintain a high cooling rate,while the bottom deposited layer was subjected to a weak tempering *** show that a high proportion of martensite is produced,which improves the strength of the deposited *** the laser scanning strategy of laser power 2,500 W,scanning velocity 5 mm·s^(-1),powder feeding rate 11 g·min^(-1),overlap rate 50%,and a laser power difference of 50 W and a 2 min interval,the tensile strength of the deposited layer of 12CrNi2 steel is in the range of 873-1,022 MPa,and the elongation is in the range of 16.2%-18.9%.This study provides a method to reduce the tempering effect of the subsequent deposition layers on the bottom layers,which can increase the proportion of martensite in the low-alloy high-strength steel,so as to improve the yield strength of the alloy steel.

关键词： alloy steel direct laser deposition thermal cycles microstructure evolution mechanical properties

Development of remaining life prediction of crankshaft remanufacturing core

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Advances in Manufacturing 2013年第1期1卷 91-96页

作者： Li-Hong Dong bin-shi xu Nan xue Hui-Peng Wang Hao-Yu Li Science and Technology on Remanufacturing Laboratory

This paper reviewed the main research work in the field of remaining life prediction of crankshaft remanufacturing core by Science and Technology on Remanu- facturing Laboratory. Based on the results of finite element analysis, the R angle zone of crankshaft was determined as a major measuring position. A special measuring probe is developed, and bending fatigue bench tests were carried out to collect electromagnetic damage information during fatigue process. A neural network model was established to identify damage degree of crankshaft core, and a damage evaluation equipment for crankshaft core was developed.

关键词： Remanufacturing Remaining life Crankshaft Metal magnetic memory Multi-frequency eddy current

A direct electrochemical biosensor for rapid glucose detection based on nitrogen-doped carbon nanocages

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Rare Metals 2024年第5期43卷 2184-2192页

作者： Lan-Lan Li Yu Zhao Li-Jia Pan Jian-bin xu Yi shi College of Mechanical and Electrical Engineering Henan Agricultural UniversityZhengzhou 450002China School of Electronic Science and Engineering Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing210093China Department of Electronic Engineering The Chinese University of HongKongHongkong 999077China

Given the increasing number of diabetic patients,rapid and accurate detection of glucose in body fluids is *** study developed a direct electrochemical biosensor for glucose based on nitrogen-doped carbon nanocages(NCNCs).NCNCs possess a large specific surface area of 1395 m^(2)·g^(-1),a high N atomic content of 9.37%and good biocompatibility,which is favorable for enzyme loading and electron *** surface average concentration of electroactive glucose oxidase on NCNCs was 2.82×10^(-10)mol·cm^(-2).The NCNC-based direct electrochemical biosensor exhibited a high sensitivity of 13.7μA·(mmol·L^(-1))^(-1)·cm^(-2),rapid response time of 5 s and an impressive electron-transferrate constant(ks)of 1.87 s^(-1).Furthermore,we investigated an NCNC-based direct electron transfer(DET)biosensor for sweat glucose detection,which demonstrated tremendous promise for non-invasive wearable diabetes diagnosis.

关键词： Direct electron transfer(DET) Nitrogen-doped carbon nanocages(NCNCs) Glucose oxidase Biosensor