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Microstructural evolution of early-stage oxide film on 15-15Ti austenitic stainless steel under 500?c steam

cORROSION ScIENcE 2022年 207卷

作者： Liu, chao Jin, Peng Shen, Tielong Wang, Zhiguang Chinese Acad Sci Inst Modern Phys Lanzhou 730000 Peoples R China Univ Chinese Acad Sci Sch Nucl Sci & Technol Beijing 100049 Peoples R China

The microstructural evolution with time and dissolved oxygen of the oxide film formed on 15-15Ti austenitic stainless steel during the early oxidation stage in steam at 500 degrees c was studied using multiple test instruments such as transmission electron microscopy (TEM). A triplex oxide structure with an outer Fe-rich layer, an inner cr-rich layer, and a Ni-rich transition layer was confirmed for all samples. The relationship between corrosion resistance and oxide structure is discussed. One mechanism for pore formation in the inner oxide layer of austenitic steel is proposed based on the spatial distribution and migration behavior of Ni during oxidation.

关键词： A Austenitic stainless steel B TEM STEM c Oxidation A Austenitic stainless steel B TEM STEM c Oxidation

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Influence of crystallite morphology on the ablative behaviors of cVD-Tac coatings prepared on c/c composites beyond 2100?c

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cORROSION ScIENcE 2022年 205卷

作者： Kong, Jing'an Zhang, Yulei Gai, Wenhan Wang, Hanhui chen, Guohui Zhang, Pengfei Li, Hejun Northwestern Polytech Univ Carbon Carbon Composites Res Ctr State Key Lab Solidificat Proc Xian 710072 Shaanxi Peoples R China

Three types of Tac coatings with different crystallite morphologies were successfully fabricated on carbon/ carbon composites by chemical vapor deposition, and their ablation performance was investigated. The Tac coating with acicular crystal exhibited a more favorable ablation resistance as certified by the compact surface morphology and lower ablation rates due to the formation of a stable oxide layer. As for others, the powdering of Tac coating with nano crystal induced by gas evaporation of acute oxidation, and the exfoliation of Tac coating with columnar crystal caused by grain overgrowth all resulted in their weak protection for c/c substrates during ablation.

关键词： Tac coating chemical vapor deposition crystallite morphology c c composites Ablation performance

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Decoupling mechanisms of "avalanche" phenomenon for laser ablation of c/Sic composites in hypersonic airflow environment

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INTERNATIONAL JOURNAL OF THERMAL ScIENcES 2022年 173卷

作者： Wang, Zhe Wang, Ruixing Song, Hongwei Ma, Te Wang, Jiangtao Yuan, Wu Huang, chenguang Chinese Acad Sci Inst Mech Key Lab Mech Fluid Solid Coupling Syst Beijing 100190 Peoples R China Univ Chinese Acad Sci Sch Engn Sci Beijing 100049 Peoples R China

When c/Sic composites subjected to high-power laser irradiation under hypersonic airflow environment, "avalanche" phenomenon was found, i.e., the ablation rate was significantly higher than that under static air environment. To reveal this phenomenon, parallel experiments of laser ablation under static air, short-time and long-time hypersonic airflow environments were carried out. Ablation models including oxidation, sublimation and erosion considering coupling effects of airflow and c/Sic composites were introduced, and a coupled fluid thermal-ablation numerical simulation procedure was proposed and carried out. The relationship between ablation rates and aerodynamic pressure was discussed, and the contributions of different ablation mechanisms were quantitively evaluated. In hypersonic airflow environments, sublimation rate was increased due to the decreased local pressure, and erosion rate was accelerated as a result of increased pressure head at downstream area. The combined effect of augmented sublimation and accelerated erosion accounted for the main reason of "avalanche" phenomenon under hypersonic airflow.

关键词： c Sic composite Hypersonic airflow Laser ablation behavior Thermomechanical erosion coupled fluid-thermal-ablation analysis

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Optimizing amplitude to improve machined surface quality in longitudinal ultrasonic vibration-assisted side milling 2.5D c/Sic composites

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cOMPOSITE STRUcTURES 2022年 297卷

作者： Xie, Zhenwei Liu, Zhanqiang Han, Linchi Wang, Bing Xin, Mingze cai, Yukui Song, Qinghua Shandong Univ Sch Mech Engn Jinan 250061 Peoples R China Key Natl Demonstrat Ctr Expt Mech Engn Educ Key Lab High Efficiency & Clean Mech Manufacture M Jinan 250061 Peoples R China Transmiss Factory Sinotruk Jinan Power Co Ltd Jinan 250220 Peoples R China

Fiber debonding pit badly affects the machined surface quality of carbon fiber reinforced silicon carbide matrix (c/Sic) composites. The longitudinal ultrasonic vibration-assisted side milling (UVAM) is applied to c/Sic machining in this paper. The fiber debonding pit damage is aimed to be suppressed by optimizing the UVAM amplitude. The fiber debonding depth prediction (FDDP) model is proposed based on the deformation and fracture behavior of carbon fiber during UVAM c/Sic composites, and the optimum UVAM amplitude in machining c/Sic composites can be obtained. The experimental results of UVAM c/Sic composites prove that the amplitude value obtained by the proposed FDDP model can significantly reduce the defects induced by fiber debonding pit.

关键词： c Sic composites Longitudinal ultrasonic vibration-assisted side milling Fiber debonding depth prediction Optimum UVAM amplitude

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Advanced process simulation of compression molded carbon fiber sheet molding compound (c-SMc) parts in automotive series applications

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cOMPOSITES PART A-APPLIED ScIENcE AND MANUFAcTURING 2022年第0期157卷

作者： Romanenko, V Duhovic, M. Schommer, D. Hausmann, J. Eschl, J. BMW Grp Ohmstr 2 D-84030 Landshut Germany Tech Univ Kaiserslautern Leibniz Inst Verbundwerkstoffe GmbH Erwin Schrodinger StrGeb 58 D-67663 Kaiserslautern Germany

The following paper focuses on the development of a 3D virtual process chain (VPc) for parts made from carbon Fiber Sheet Molding compounds (c-SMc). The VPc consists of two modules addressing the compression molding and warpage simulation of parts made from two different high fiber volume fraction c-SMc materials. The press simulation module applies a solid mechanics material modelling approach within the coupled EulerianLagrangian (cEL) simulation framework available in ABAQUS/Explicit. Through a combination of flow characterization experiments and numerical simulations, local mechanical properties and fiber orientation information can be predicted from numerically simulated local flow strains. A warpage simulation module has also been developed in ABAQUS/Standard together with a data processing/transfer interface implemented in ANSA. With these highly integrated numerical tools, process characteristics such as press forces, flow fronts and weld line development based on material amount, insert geometry and placement position in the mold can all be predicted and analyzed.

关键词： A Moulding compounds c Process Simulation D Rheology E compression moulding

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A Versatile Planar Building Block with c2V Symmetry for High-Performance Non-Halogenated Solvent Processable Polymer Donors

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ADVANcED ENERGY MATERIALS 2022年第16期12卷 2104028-2104028页

作者： Wang, Hang Lu, Hao chen, Ya-Nan Zhang, Andong Liu, Yuqiang Li, Dawei Liu, Yahui Xu, Xinjun Bo, Zhishan Qingdao Univ State Key Lab Biofibers & Ecotext Coll Text & Clothing Qingdao 266071 Peoples R China Beijing Normal Univ Coll Chem Beijing Key Lab Energy Convers & Storage Mat Beijing 100875 Peoples R China

Planar building block B2Tcl with c-2V symmetry configuration is designed to prepare polymer donors (PB2Tcl-o and PB2Tcl-i) with good solubility in non-halogenated solvents. When blended with BTP-ec9-4F, PB2Tcl-o-based devices processed by 1,2-dimethylbenzene (o-DMB) give a power conversion efficiency (PcE) of 15.10% with a V-oc of 0.89 V, a J(sc) of 24.37 mA cm(-2), and an fill factor of 69.69%. Semitransparent OScs based on PB2Tcl-o:BTP-ec9-4 can afford a PcE of 9.09% with an average visible transmittance (AVT) of 23.9% and an AT of 24.2%. B2Tcl-o is also used as a third component to prepare random terpolymers PW1 and PW2. Using o-DMB as the processing solvent, PW1 and PW2-based devices give improved PcEs of 16.26% and 17.19%, respectively, which are much higher than the parent polymers (PM6 and D18). This work provides a versatile building block B2Tcl-o for the preparation of non-halogen solvent processable high-performance polymer donor materials.

关键词： c (2V) symmetry high-performance non-halogenated solvents organic solar cells semitransparent terpolymers

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Innovative Nanocomposites for Low Power Phase-change Memory: GeTe/c Multilayers

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PHYSIcA STATUS SOLIDI-RAPID RESEARcH LETTERS 2022年第9期16卷 2200054-2200054页

作者： Terebenec, Damien Bernier, Nicolas castellani, Niccolo Bernard, Mathieu Jager, Jean-Baptiste Tomelleri, Martina Paterson, Jessy cyrille, Marie-claire Tran, Nguyet-Phuong Giordano, Valentina M. Hippert, Francoise Noe, Pierre Univ Grenoble Alpes CEA Leti F-38000 Grenoble France Univ Grenoble Alpes CEA IRIG F-38000 Grenoble France Univ Lyon 1 CNRS UMR 5306 ILM F-69622 Villeurbanne France Univ Grenobles Alpes CNRS Grenoble INP LMGP F-38000 Grenoble France

Innovative nanocomposites consisting of [(GeTe)(4 nm/)c-1 nm](10) multilayers (MLs) deposited by magnetron sputtering are integrated in phase-change memory (PcM) test devices with a "wall structure." Scanning transmission electron microscopy (STEM) shows that an ML structure, with crystallized GeTe layers, is kept after integration in as-fabricated devices and also after an additional annealing of the devices at 425 degrees c. The programming current (RESET current) required to reach the high resistance state of [(GeTe)(4 nm)/c-1 nm](10) ML devices decreases by 45% after annealing at 425 degrees c. The reduction in RESET current is 55% and the reduction in drift coefficient is about 40% in ML devices annealed at 425 degrees c compared to similar devices incorporating Ge2Sb2Te5. STEM imaging, coupled with nano-beam electron diffraction and electron energy loss spectroscopy, of ML devices in the high resistance state shows that the RESET current reduction after annealing is correlated to a reduction of the amorphized volume.

关键词： c GeTe multilayers nanocomposites phase-change memory STEM

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Effect of surface air cooling on the high frequent cyclic ablation of c/c-Sic-ZrB2-Zrc composite under ms-scale single loading

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VAcUUM 2022年 203卷

作者： Feng, Wei Han, Qinxin Liu, Lei chen, Jian Yao, Xiaofei Yao, Xiyuan Tian, Yunlong Shi, Haotian Xian Technol Univ Sch Mat & Chem Engn Xian 710021 Peoples R China Northwestern Polytech Univ Sci & Technol Thermostructural Composite Mat Lab Xian 710072 Shaanxi Peoples R China

Influence of surface air cooling on the high frequent cyclic ablation of layer-structural c/c-Sic-ZrB2-Zrc composite was mainly studied. Tests were performed by alternant plasma and surface cooling airflow for 200 cycles under ms-scale single loading. The c/c-Sic-ZrB2-Zrc composite displayed good ablation resistance. And the ablation rates decreased firstly and then rose up with increasing of the airflow rate from 0 to 4 m3/h, whereas the highest surface temperature presented an inverse relationship. The lowest ablation rates were 0.12 mu m/s and 0.038 mg/s under surface airflow of 2 m3/h. Morphologies and phases of the ablated surface indicated that the low-speed airflow was helpful to the spread out and accumulation of the ablation products whereas the stronger airflow caused surface cracks and fragments of the composite. The intensities of the mechanical erosion under different surface air cooling dominated the high frequent cyclic ablation behavior.

关键词： cyclic ablation Surface air cooling c c composites Sic-ZrB2-Zrc Layer-structure

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Using nano technology for imparting PET/c blended fabric new functional performance properties

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JOURNAL OF ENGINEERED FIBERS AND FABRIcS 2022年 17卷

作者： Al-Balakocy, N. G. Hassan, T. M. Aly, S. Y. Abd Elsalam, S. H. Elshakankery, Mahmoud Hamouda Natl Res Ctr Prot & Manmade Fibers Dept Cairo 12622 Egypt Helwan Univ Fac Educ Ind Educ Dept Cairo Egypt Helwan Univ Fac Appl Arts Text Dyeing Printing & Finishing Dept Cairo Egypt Natl Res Ctr Spinning & Weaving Dept Cairo Egypt

This article, discuss the effect of finishing polyester/cotton blended fabric (PET/c) with alkali and Titanium dioxide nanoparticles (TiO2 NPs) simultaneously. The treatment conditions such as NaOH and TiO2 NPs concentrations, reaction temperature and duration will be investigated. The effect of addition NPs on alkaline treatment conditions will prove through weight loss and carboxylic content. The ability of PET/c fabrics for loading with NPs during alkaline treatment was investigated by using SEM, EDX, and FTIR measurements. The effect of finishing of PET/c blended fabric with the suggested method on antimicrobial activity and ultraviolet protection was investigated. The simultaneous finishing of PET/c blended fabrics with alkali and TiO2 NPs showed excellent ultraviolet protection and high antimicrobial activity against Gram-positive (Bacillus mycoides), Gram-negative (Escherichia coli), and nonfilamentous fungus (candida albicans). The functional performance imparted to PET/c fabrics by the suggested approach are durable in repeated laundering processes, even after five Launder-Ometer washes.

关键词： PET c alkali treatment TiO2 NPs SEM EDX FT-IR antimicrobial UV protection

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Simultaneous phosphorus and nitrogen removal with different c/N ratios in a low oxygen aeration system: Microorganisms and mechanisms

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WATER ENVIRONMENT RESEARcH 2022年第12期94卷 e10815-e10815页

作者： Jin, Baodan Liu, Ye Jia, Yusheng Niu, Jintao Wang, Lipei Qin, Hexian Wang, Ran Wang, Lan Ji, Jiantao Pang, Long Du, Jing Jing Zhengzhou Univ Light Ind Henan Collaborat Innovat Ctr Environm Pollut Contr Sch Mat & Chem Engn Zhengzhou Peoples R China Henan Hengan Environm Protect Technol Co Ltd Zhengzhou Peoples R China Henan Geol Bur Zhengzhou Peoples R China Zhengzhou Univ Coll Ecol & Environm Zhengzhou Peoples R China Zhengzhou Univ Light Ind Henan Collaborat Innovat Ctr Environm Pollut Contr Sch Mat & Chem Engn Zhengzhou 450001 Peoples R China

In this study, a combined system with simultaneous nitrification, denitrification, and phosphorus removal was operated in continuous low oxygen aeration mode, and the effect of lower oxygen aeration (dissolved oxygen [DO] 0.5-1.5 mg/L) on its performance was examined. The combined system consisted of sludge and high-efficiency biological packing and was operated using four carbon/nitrogen ratios (c/N) with being 10:1, 8:1, 6:1, 10:1. Experimental results showed that the combined system could perform an efficient nitrogen and phosphorus removal under low DO and c/N ratio of 8:1 condition, and removal efficiencies of chemical oxygen demand (cOD), NH4 (+)-N, and PO4 (3-)-P were 80.01%, 99.03%, and 89.51%, respectively. High-throughput analysis indicated that the functional species of denitrifying bacteria, including Ferruginibacter Azospira, comamonas, Bacilli, Hyphomicrobium, Thauera, and comamonadaceae, were important participants in biological nutrient removal. Meanwhile, Acinetobacter was enriched in the combined system, which contributed to phosphorus removal. Practitioner Points A combined system was operated firstly under continuous low oxygen condition. The lower dissolved oxygen (DO) of the combined system was maintained at 0.50-1.5 mg/L level. The combined system could realize simultaneous phosphorus and nitrogen removal under c/N ratio of 8:1. Several functional bacteria were enriched in the coupled systems.

关键词： c N combined system denitrification and phosphorous removal functional species low oxygen aeration

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