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Preparation and characterization of nanocrystalline ZrO2-7%Y2O3 powders for thermal barrier coatings

Kirsten BOBZIN, Lidong ZHAO, Thomas SCHLAEFER, Thomas WARDA

Frontiers of Mechanical Engineering 2011, Volume 6, Issue 2,   Pages 176-181 doi: 10.1007/s11465-011-0220-4

Abstract: ZrO2-7%Y2O3spray powder was ball-milled to produce nanocrystalline powdersThe powders were investigated in terms of their crystallite sizes and morphologies by X-ray diffraction

Keywords: nanostrucured powders     yttria stabilized zirconia (YSZ)     high-energy ball milling     thermal barrier coatings    

Highly selective and green recovery of lithium ions from lithium iron phosphate powders with ozone

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 6,   Pages 749-758 doi: 10.1007/s11705-022-2261-0

Abstract: Since lithium iron phosphate cathode material does not contain high-value metals other than lithium, it is therefore necessary to strike a balance between recovery efficiency and economic benefits in the recycling of waste lithium iron phosphate cathode materials. Here, we describe a selective recovery process that can achieve economically efficient recovery and an acceptable lithium leaching yield. Adjusting the acid concentration and amount of oxidant enables selective recovery of lithium ions. Iron is retained in the leaching residue as iron phosphate, which is easy to recycle. The effects of factors such as acid concentration, acid dosage, amount of oxidant, and reaction temperature on the leaching of lithium and iron are comprehensively explored, and the mechanism of selective leaching is clarified. This process greatly reduces the cost of processing equipment and chemicals. This increases the potential industrial use of this process and enables the green and efficient recycling of waste lithium iron phosphate cathode materials in the future.

Keywords: lithium iron phosphate powder     stoichiometric number     selective leaching     lithium recovery    

Preparation and photocatalytic kinetics of nano-ZnO powders by precipitation stripping process

ZHANG Dongxiang, XUE Min, XU Hang, XU Wenguo, TARASOV V

Frontiers of Chemical Science and Engineering 2008, Volume 2, Issue 3,   Pages 319-324 doi: 10.1007/s11705-008-0051-y

Abstract: Ultra-fine zinc oxalate powders were prepared through a precipitation stripping method with bis(2-ethylhexylZinc oxide powders were obtained by decomposing zinc oxalate powders at 450°C.The prepared zinc oxide powders were characterized by transmission electron microscope (TEM), ScanningThe results show that some zinc oxide powders were micro-multipore materials with hexagonal crystal.

Keywords: 2-ethylhexyl     micro-multipore     Photo-Layer     hexagonal     methylene    

Design of Simulations” approach for exploiting and calibrating discrete element simulations of cohesive powders

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 6,   Pages 874-885 doi: 10.1007/s11705-021-2131-1

Abstract: The flow behaviours of cohesive particles in the ring shear test were simulated and examined using discrete element method guided by a design of experiments methodology. A full factorial design was used as a screening design to reveal the effects of material properties of partcles. An augmented design extending the screening design to a response surface design was constructed to establish the relations between macroscopic shear stresses and particle properties. It is found that the powder flow in the shear cell can be classified into four regimes. Shear stress is found to be sensitive to particle friction coefficient, surface energy and Young’s modulus. A considerable fluctuation of shear stress is observed in high friction and low cohesion regime. In high cohesion regime, Young’s modulus appears to have a more significant effect on the shear stress at the point of incipient flow than the shear stress during the pre-shear process. The predictions from response surface designs were validated and compared with shear stresses measured from the Schulze ring shear test. It is found that simulations and experiments showed excellent agreement under a variety of consolidation conditions, which verifies the advantages and feasibility of using the proposed “Sequential Design of Simulations” approach.

Keywords: discrete element method     cohesive materials     parameter calibration     ring shear cell     design of experiments    

Research and Development Trends of Electrodeposited Multifunctional Composite Materials

Guo Zhongcheng,Zhu Xiaoyun,Yang Xianwan

Strategic Study of CAE 2004, Volume 6, Issue 4,   Pages 86-94

Abstract: electrodeposition, pulse composite electrodeposition, pulse jet electrodeposition, electrodeposition of nano-powders

Keywords: electrodeposition     composite coatings     nano-powders     founctional gradient materials     pulse jet    

Assessing the effects of different dielectrics on environmentally conscious powder-mixed EDM of difficult-to-machine material (WC-Co)

Jagdeep SINGH,Rajiv Kumar SHARMA

Frontiers of Mechanical Engineering 2016, Volume 11, Issue 4,   Pages 374-387 doi: 10.1007/s11465-016-0388-8

Abstract: Researchers have successfully performed hybridization to improve this process by incorporating powders

Keywords: WC     hazard and operability analysis (HAZOP)     discharging     aerosol concentration     dielectrics     powders    

Characteristics of Inconel Powders for Powder-Bed Additive Manufacturing

Quy Bau Nguyen, Mui Ling Sharon Nai, Zhiguang Zhu, Chen-Nan Sun, Jun Wei, Wei Zhou

Engineering 2017, Volume 3, Issue 5,   Pages 695-700 doi: 10.1016/J.ENG.2017.05.012

Abstract: Inconel powder is suitable for AM and can be a good reference for researchers who attempt to produce AM powders

Keywords: Additive manufacturing     Powder characteristics     Gas atomization     Microstructure     Inconel    

Title Author Date Type Operation

Preparation and characterization of nanocrystalline ZrO2-7%Y2O3 powders for thermal barrier coatings

Kirsten BOBZIN, Lidong ZHAO, Thomas SCHLAEFER, Thomas WARDA

Journal Article

Highly selective and green recovery of lithium ions from lithium iron phosphate powders with ozone

Journal Article

Preparation and photocatalytic kinetics of nano-ZnO powders by precipitation stripping process

ZHANG Dongxiang, XUE Min, XU Hang, XU Wenguo, TARASOV V

Journal Article

Design of Simulations” approach for exploiting and calibrating discrete element simulations of cohesive powders

Journal Article

Research and Development Trends of Electrodeposited Multifunctional Composite Materials

Guo Zhongcheng,Zhu Xiaoyun,Yang Xianwan

Journal Article

Assessing the effects of different dielectrics on environmentally conscious powder-mixed EDM of difficult-to-machine material (WC-Co)

Jagdeep SINGH,Rajiv Kumar SHARMA

Journal Article

Characteristics of Inconel Powders for Powder-Bed Additive Manufacturing

Quy Bau Nguyen, Mui Ling Sharon Nai, Zhiguang Zhu, Chen-Nan Sun, Jun Wei, Wei Zhou

Journal Article