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Development of Structure at Extrusion of a Strip of Made of Cu through the DRECE Machinery

材料科学与工程（中英文A版） 2011年第6期1卷 844-848页

作者： Stanislav Rusz Karel Malanik tibor donie Jan Kedron Stanislav Tylsar Michal Salajka Department of Mechanical Technologies Faculty of Mechanical Engineering VSB - Technical University of Ostrava Ostrava-Poruba 708 33 Czech Republic Iron and Steel Research Institute Dobra 739 51 Czech Republic Department of Applied Mechanics Faculty of Engineering Technical University of Zilina Zilina 010 26 Slovakia

Achievement of ultra-fine grained (UFG) structure in the strip of sheet is one of the basic problems of the current research in the field of forming. Contrary to bulk forming (processes ECAP, HPT, Conform, etc.), it is much more difficult to achieve high degree of deformation during 5 to 7-8 passes by the processes ARB, C2S2 (DCAP). At extrusion of the strip of sheet with use of the process C2S2 the refinement of structure (e. g., in the sheet made of Al) is visible only after 12-15 passes. This is given by the possibility of use of only one type of passes designated in literature as "C" (pass with turning of material by 180°). This creates smaller number of different types of shear planes than at the passes of the type "Bc". The paper gives an analysis of influence of number of passes on structure refinement of a strip of Al sheet on the brand new prototype equipment, DRECE (Dual Rolling Equal Channel Extrusion). The process was mathematically simulated and results were mutually compared.

关键词：细晶粒结构等通道挤压条形机械制造变形程度通行证铝板材

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Enhanced photoluminescence of a microporous quantum dot color conversion layer by inkjet printing

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Nano Research 2024年第8期17卷 7717-7725页

作者： Junchi Chen Qihao Jin Yidenekachew.J.donie Orlando.T.Perales Dmitry Busko Bryce.S.Richards Uli Lemmer Light Technology Institute(LTI) Karlsruhe Institute of Technology(KIT)Engesserstrasse 1376131 KarlsruheGermany Department of Chemical Engineering and Materials Science University of Minnesota(UMN)421 Washington Ave.SEMinneapolisMN 55455-0132USA Institute for Microstructure Technology Karlsruhe Institute of Technology(KIT)Hermann-von-Helmholtz-Platz 176344 Eggenstein-LeopoldshafenGermany

Owing to their high color purity,tunable bandgap,and high efficiency,quantum dots(QDs)have gained significant attention as color conversion materials for high-end display ***,inkjet-printed QD pixels show great potential for realizing full-color mini/micro-light emitting diode(micro-LED)-based *** a color conversion layer,the photoluminescence intensity of QDs is limited by the insufficient absorptance of the excitation light due to the lack of *** scatterers,such as titanium dioxide microparticles,have been applied after additional surface engineering for sufficient dispersity to prevent nozzle clogging in inkjet printing *** our work,as an alternative approach,we use inkjet printing for depositing a phase separating polymer ink based on polystyrene(PS)and polyethylene glycol(PEG).QD/polymer composite pixels with scattering micropores are *** morphology of the micropores can be tailored by the weight ratio between PS and PEG which enables the manipulation of scattering *** the presence of the microporous structure,the photoluminescence intensity of the QD film is enhanced by 110%in drop-cast films and by 35.3%in inkjet-printed QD pixel arrays compared to the reference samples.

关键词： porous structure inkjet printing phase separation quantum dots display technology

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