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Fluoride-mediated corrosion mechanism of atmospheric-plasma-sprayed yttrium–aluminium garnet ceramic coatings

Journal of the European Ceramic Society 2022年第13期42卷 6146-6158页

作者： Huang, Biao Wang, Jun Tang, Zheng-hua Li, Wei-dong Zhu, Wen-jian Gu, Ren-Bao College of Material Science and Engineering Sichuan University Sichuan Chengdu610065 China College of Mechanical Engineering Sichuan University Sichuan Chengdu610065 China Jiangsu KVTS Semiconductor Technology Co. Ltd. Jiangsu Wuxi214000 China

Atmospheric-plasma-sprayed yttrium–aluminium garnet coatings were exposed to Ar/O2/CF4 plasma in a capacitively coupled plasma etching machine to induce fluoride-mediated corrosion and to elucidate the mechanism by which fluoride-containing plasma etched the coatings. In the first corrosion stage, the fully melted region, non-fused particles, and pore edges were etched;the etching products consisted of a series of aggregated and stacked fan-shaped particles, among which the non-fused particles exhibited the most severe etching. With prolonged etching, various coating surface regions gradually fused and smoothened, while the surface roughness decreased. Corrosion products Al2O3•AlF3, YOF, and YF3 were also formed on the coating surface, and the etching product evolution looked like the fungus Ganoderma lucidum;hence, the name ‘fungal etching’. The study findings will further the development of ceramic coatings resistant to corrosion by halogen plasma for application to semi-conductor processing equipment. © 2022 Elsevier Ltd

关键词： Yttrium aluminum garnet

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Characterization of Fluoride-added Hydroxyapatite Derived from Eggshells for Dental Application 15

Characterization of Fluoride-added Hydroxyapatite Derived fr...

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15th Biomedical engineering International Conference, BMEiCON 2023

作者： Uthayaphamornwat, Vilasinee Khantachawana, Anak Kitiwan, Mettaya Srirussamee, Kasama Tunthawiroon, Phacharaphon School of Engineering Department of Biomedical Engineering Bangkok10520 Thailand Faculty of Engineering Department of Mechanical Engineering Bangkok10140 Thailand Biological Engineering Program Faculty of Engineering Bangkok10140 Thailand School of Science Department of Physics Bangkok10520 Thailand Devices and Systems for Energy and Environment Research Unit School of Science Bangkok10520 Thailand School of Engineering Department of Industrial Engineering Bangkok10520 Thailand

ISBN: (纸本)9798350345247

Hydroxyapatite (HA) is one of the potential biomaterials used for treating dental defects. It can be incorporated with fluoride to enhance its anti-caries properties, though other properties could be dependent on processing technique. Hence, this study aims to characterize the influence of sintering on the properties of fluoride-added HA derived from eggshells. FTIR and XRD techniques are used to characterize the chemical and crystal structures of the samples, whilst dissolution test is carried out to characterize material degradation in the acidic environment. The results show that sintering increased the crystallinity in both HA and fluoride-add HA (F-HA) samples, which corresponds with the enhanced stability during the dissolution test. Moreover, it is also found that the addition of fluoride could further stabilize the material structure, though the impurities found in all the samples still need to be minimized. These findings suggest that sintering and fluoride addition could potentially enhance anti-caries properties of eggshell-derived HA, which could be beneficial for dental application in future subject to further process optimization and analysis. © 2023 IEEE.

关键词： Hydroxyapatite

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In vitro and in vivo study on fine-grained Mg-Zn-RE-Zr alloy as a biodegradeable orthopedic implant produced by friction stir processing

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Bioactive materials 2023年第10期28卷 448-466页

作者： Vasanth C.Shunmugasamy Marwa AbdelGawad Muhammad Umar Sohail Talal Ibrahim Talha Khan Thomas Daniel Seers Bilal Mansoor Mechanical Engineering Program Texas A&M University at QatarEducation CityDohaQatar Department of Mechanical Engineering Texas A&M University3123 TAMUCollege StationTX 77843USA Proteomics Core Weill Cornell MedicineEducation CityDohaQatar Department of Surgery Division of Orthopedic SurgerySidra MedicineDohaQatar Clinical Orthopedic Surgery Weill Cornell MedicineEducation CityDohaQatar Petroleum Engineering Program Texas A&M University at QatarEducation CityDohaQatar Department of Materials Science and Engineering Texas A&M University3003 TAMUCollege StationTX 77843USA

Magnesium alloys containing biocompatible components show tremendous promise for applications as temporary biomedical devices. However, to ensure their safe use as biodegradeable implants, it is essential to control their corrosion rates. In concentrated Mg alloys, a microgalvanic coupling between the α-Mg matrix and secondary precipitates exists which results in increased corrosion rate. To address this challenge, we engineered the microstructure of a biodegradable Mg-Zn-RE-Zr alloy by friction stir processing (FSP), improving its corrosion resistance and mechanical properties simultaneously. The FS processed alloy with refined grains and broken and uniformly distributed secondary precipitates showed a relatively uniform corrosion morphology accompanied with the formation of a stable passive layer on the alloy surface. In vivo corrosion evaluation of the processed alloy in a small animal model showed that the material was well-tolerated with no signs of inflammation or harmful by-products. Remarkably, the processed alloy supported bone until it healed till eight weeks with a low in vivo corrosion rate of 0.7 mm/year. Moreover, we analyzed blood and histology of the critical organs such as liver and kidney, which showed normal functionality and consistent ion and enzyme levels, throughout the 12- week study period. These results demonstrate that the processed Mg-Zn-RE-Zr alloy offers promising potential for osseointegration in bone tissue healing while also exhibiting controlled biodegradability due to its engineered microstructure. The results from the present study will have profound benefit for bone fracture management, particularly in pediatric and elderly patients.

关键词： Biodegradable magnesium Bone healing Friction stir processing Microstructure Corrosion resistance

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Key fuel characteristics and techno-economic aspects of torrefied rubberwood biomass pellets produced by incorporating various cassava-based binders at varied doses

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Environmental science and Pollution Research 2024年第25期31卷 37663-37680页

作者： Kongto, Pumin Palamanit, Arkom Chaiprapat, Sumate Tippayawong, Nakorn Khempila, Jarunee Ruangim, Panatda Energy Technology Program Department of Interdisciplinary Engineering Faculty of Engineering Prince of Songkla University 15 Kanjanavanich Rd. Songkhla Hat Yai90110 Thailand Research Center Faculty of Engineering Prince of Songkla University 15 Kanjanavanich Rd. Songkhla Hat Yai90110 Thailand Department of Civil and Environmental Engineering Faculty of Engineering Prince of Songkla University 15 Kanjanavanich Rd. Songkhla Hat Yai90110 Thailand Department of Mechanical Engineering Chiang Mai University 239 Huay Kaew Rd. Chiang Mai Muang District 50200 Thailand Physics Program Faculty of Science and Technology Rajabhat Maha Sarakham University 80 Nakhon Sawan Rd. Maha Sarakham Mueang District 44000 Thailand

Improving energy content and hydrophobic nature of woody biomass can be pursued through torrefaction. This gives torrefied biomass with a low bulk density, potentially increasing storage and transport costs. To overcome this issue, densifying the torrefied biomass is necessary. However, poor binding of particles makes densification challenging without using a binder. Therefore, the aim of this study was to investigate the physicochemical characteristics and techno-economic aspects of torrefied rubberwood biomass (TRWB) when pelletized using various cassava-based binders at different blending ratios. The selected binders included cassava starch (CS), cassava pulp (CP), and cassava chip (CC). Each binder at 5%, 10%, or 15% (wt.) was mixed with TRWB and water before pelletizing using a flat die machine. The results revealed that pelletizing TRWB with different cassava-based binders at various blending ratios influenced the physicochemical characteristics of the TRWB pellets, particularly dimensions, bulk density, fuel and atomic ratios, and energy content. The TRWB pellets demonstrated energy densities in the range of 7.95–11.39 GJ/m3, and their mechanical durability and fine content fell within acceptable ranges. The TRWB pellets maintained their shape during 120 min of water soaking, with water absorption levels varying by binder dose. The pelletizing ability, material, and energy costs of TRWB pellets depend on binder type and dose. CP can be applied as a binder for pelletizing torrefied rubberwood biomass. However, the mechanical durability of the product needs to be above the user requirement or standard. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

关键词： Pelletizing

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Synergistic Tuning of Nickel Cobalt Selenide@Nickel Telluride Core-Shell Heteroarchitectures for Boosting Overall Urea Electrooxidation and Electrochemical Supercapattery

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Energy & Environmental materials 2024年第1期7卷 301-312页

作者： Diab Khalafallah Weibo Huang Mingjia Zhi Zhanglian Hong State Key Laboratory of Silicon Material School of Materials Science and EngineeringZhejiang University38 Zheda RoadHangzhou 310027China Mechanical Design and Materials Department Faculty of Energy EngineeringAswan UniversityP.O.Box 81521AswanEgypt

Herein,we demonstrate the synthesis of bifunctional nickel cobalt selenide@nickel telluride(Ni_(x)Co_(12-x)Se@NiTe)core-shell heterostructures via an electrodeposition approach for overall urea electrolysis and *** 3D vertically orientated NiTe dendritic frameworks induce the homogeneous nucleation of 2D Ni_(x)Co_(12-x)Se nanosheet arrays along similar crystal directions and bring a strong interfacial binding between the integrated active *** particular,the optimized Ni_(6)Co_(6)Se@NiTe with an interface coupling effect works in concert to tune the intrinsic *** only needs a low overpotential of 1.33 V to yield a current density of 10 mA cm^(-2)for alkaline urea ***,the full urea catalysis driven only by Ni_(6)Co_(6)Se@NiTe achieves 10 mA cm^(-2)at a potential of 1.38 V and can approach a constant level of the current response for 40 ***,the integrated Ni_(6)Co_(6)Se@NiTe electrode delivers an enhanced specific capacity(223 mA h g^(-1)at 1 A g^(-1))with a high cycling ***,a hybrid asymmetric supercapacitor(HASC)device based on Ni_(6)Co_(6)Se@NiTe exhibits a favorable rate capability and reaches a high energy density of 67.7 Wh kg^(-1)and a power density of 724.8 W kg^(-1)with an exceptional capacity retention of 92.4%after sequential 12000 cycles at 5 A g^(-1).

关键词： bifunctional Ni_(x)Co_(12-x)Se@NiTe core-shell electrodeposition heterointerfaces supercapacitors UOR

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Initiating Binary Metal Oxides Microcubes Electromagnetic Wave Absorber Toward Ultrabroad Absorption Bandwidth Through Interfacial and Defects Modulation

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Nano-Micro Letters 2023年第12期15卷 68-81页

作者： Fushan Li Nannan Wu Hideo Kimura Yuan Wang Ben Bin Xu Ding Wang Yifan Li Hassan Algadi Zhanhu Guo Wei Du Chuanxin Hou School of Environmental and Material Engineering Yantai UniversityNo.30 Qingquan RoadYantaiShandong 264005People’s Republic of China School of Material Science and Engineering Shandong University of Science and TechnologyQingdao 266590People’s Republic of China Mechanical and Construction Engineering Faculty of Engineering and EnvironmentNorthumbria UniversityNewcastle Upon Tyne NE18STUK College of Materials Science and Engineering Taiyuan University of Science and TechnologyTaiyuan 030024People’s Republic of China Department of Electrical Engineering Faculty of EngineeringNajran University11001 NajranSaudi Arabia

Cobalt nickel bimetallic oxides(NiCo_(2)O_(4))have received numerous attentions in terms of their controllable morphology,high temperature,corrosion resistance and strong electromagnetic wave(EMW)absorption ***,broadening the absorption bandwidth is still a huge challenge for NiCo_(2)O_(4)-based ***,the unique NiCo_(2)O_(4)@C core-shell microcubes with hollow structures were fabricated via a facile sacrificial template *** concentration of oxygen vacancies and morphologies of the three-dimensional(3D)cubic hollow core-shell NiCo_(2)O_(4)@C framework were effectively optimized by adjusting the calcination *** specially designed 3D framework structure facilitated the multiple reflections of incident electromagnetic waves and provided rich interfaces between multiple components,generating significant interfacial polarization *** polarizations induced by oxygen vacancies could further enhance the attenuation ability for the incident EM *** optimized NiCo_(2)O_(4)@C hollow microcubes exhibit superior EMW absorption capability with minimum RL(RLmin)of-84.45 dB at 8.4 GHz for the thickness of 3.0 ***,ultrabroad effective absorption bandwidth(EAB)as large as 12.48 GHz(5.52-18 GHz)is *** work is believed to illuminate the path to synthesis of high-performance cobalt nickel bimetallic oxides for EMW absorbers with excellent EMW absorption capability,especially in broadening effective absorption bandwidth.

关键词： Electromagnetic wave absorber NiCo_(2)O_(4)@C Microcubes Oxygen vacancy Effective absorption bandwidth

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Research on the Technology of Brazing Repairing Nickel Based Superalloys Based on Water-Guided Laser Pretreatment

SSRN

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SSRN 2024年

作者： Li, Hanbing Shen, Jun Qiu, Tao Zhang, Yuhui State Key Laboratory of Mechanical Transmissions College of Material Science and Engineering Chongqing University China

Conventional repair methods have the drawbacks of being expensive and requiring large machining allowances in order to address the issue that aircraft engine blades made of nickel-based superalloys are prone to cracking under hard operating conditions. In order to solve this problem, this paper investigates the repair of nickel-based superalloys by pretreatment plus high-temperature brazing with water-guided laser cutting technology and compares the microstructure, elemental distribution, and shear strength of the repaired area under different methods. Discovering that water guided laser technology is the best choice for pre-treatment. and high temperature brazing repair has better fusion and more uniform phase distribution between the base metal and the seam, with higher shear strength. By optimizing the laser power parameters, the shear strength of the repaired joint has been increased to 112.69Mpa. © 2024, The Authors. All rights reserved.

关键词： Nickel alloys

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Simulation research on active control of low frequency modal vibration of double-joint flexible manipulator

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International Journal of Industrial and Systems engineering 2021年第2期39卷 287-298页

作者： Su, Jun Liu, Laoxiang School of Mechanical Engineering Henan Polytechnic Institute Nanyang473000 China School of Material Science and Engineering Chongqing Jiaotong University Chongqing400074 China

In order to solve the problems of low precision and high noise in the traditional vibration control method of manipulator, an active control method of low frequency modal vibration is proposed. The dynamic model is constructed by using the finite element equation and modal technology. The low-frequency and high-frequency modes are distinguished. The low-frequency mode is transformed into the state space equation based on the state variable. The volume and velocity are controlled to 0 by the method of 0 volume velocity mode construction. Finally, the coupling modal space control method is used to control the low frequency order frequency, damping ratio and modal shape. The active control is realised by displacement amplitude vector and velocity amplitude vector. The simulation results show that the position error of the elastic displacement of the arm and the moving platform centre in X and Y directions, is less than 0.02 mm. Copyright © 2021 Inderscience Enterprises Ltd.

关键词： Flexible manipulators

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Methods and Parameter Optimization of Manufacturing Process Using Alginate-Based Hydrogel Bioinks 2nd

Methods and Parameter Optimization of Manufacturing Process ...

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2nd International Conference on Recent Advances in Manufacturing, RAM 2021

作者： Labowska, M.B. Szymczyk-Ziólkowska, P. Michalak, I. Detyna, J. Department of Mechanics Materials and Biomedical Engineering Faculty of Mechanical Engineering Wroclaw University of Science and Technology Wroclaw Poland Faculty of Mechanical Engineering Wroclaw University of Science and Technology Wroclaw Poland Department of Advanced Material Technologies Faculty of Chemistry Wroclaw University of Science and Technology Wroclaw Poland

ISBN: (纸本)9789811677861

The application of additive manufacturing (AM) technology in biomedicine offers many advantages due to the possibility of personalization and precision in shape accurate reproduction or dose of drug selection. AM technique enables the use of a wide variety of biocompatible materials, which can be applied even in the form of hydrogel. However, the use of sodium alginate as a bioink is encountered with some difficulties, for example, problem with shape retention during fabrication before being cross-linked. In this paper, methods used in extrusion-based method that contributes to maintaining the precision and quality of the print by reducing the spill ability of alginate hydrogel are described. This paper presents one of the methods, which supports the alginate hydrogel manufacturing process—freeform reversible embedding of suspended hydrogels (FRESH), as well as the optimization of the manufacturing process parameters to improve the quality of prints. © 2022, The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.

关键词： Additive manufacturing Bioprinting FRESH method Hydrogel bioink Manufacturing parameters Sodium alginate

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Research on the Technology of Brazing Repairing Nickel Based Superalloys Based on Water-Guided Laser Pretreatment

SSRN

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SSRN 2024年

作者： Li, Hanbing Qiu, Tao Zhang, Yuhui Shen, Jun State Key Laboratory of Mechanical Transmissions College of Material Science and Engineering Chongqing University China

关键词： Nickel alloys

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