Article
Engineering, Manufacturing
Ekaterina S. Marchenko, Yuri F. Yasenchuk, Oibek Mamazakirov, Anatoly A. Klopotov, Gulsharat A. Baigonakova, Alex A. Volinsky, Sergey V. Gunter
Summary: Porous NiTi alloys with improved mechanical properties were obtained by self-propagating high-temperature synthesis (SHS) method in a closed reactor, using layer-by-layer combustion under a protective argon atmosphere. The maximum compressive strain of the porous NiTi alloys synthesized in the closed reactor was 34%, compared to 7% in the open gas flow reactor. The reaction products in the two-phase gas zone of peritectic crystallization were isolated Ti2Ni crystalline clusters in the TiNi matrix, as confirmed by X-ray diffraction, differential scanning calorimetry, scanning electron microscopy, energy dispersive spectroscopy, and optical microscopy.
MATERIALS AND MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Jianbing Meng, Hongmei Li, Xiaojuan Dong, Haoyang Yu, Haian Zhou, Shengjie Zhan, Youquan Tang
Summary: A healing composite coating was prepared on NiTi alloys by micro-arc oxidation doped with ZnO nanoparticles and sol-gel sealing with polyacrylamide, which greatly improved the corrosion resistance of NiTi alloy.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Yong Wang, Yunlong Li, Jiao Geng, Zhiming Hu, Fengjiang Liu, Liping Shi, Jiu-an Lv, Min Qiu
Summary: This study reports a method of constructing cross-linked liquid crystal polymer microstructures using femtosecond laser direct writing (FsLDW) and systematically investigates their light-driven behaviors. The arbitrary pattern machining of microstructures is achieved through optimization of processing parameters, and a micromirror system capable of controllable swing and rotation is demonstrated.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Biochemistry & Molecular Biology
Mateusz Radwanski, Michal Leski, Adam K. Puszkarz, Jerzy Sokolowski, Louis Hardan, Rim Bourgi, Salvatore Sauro, Monika Lukomska-Szymanska
Summary: The evaluation of porosities within the interface of root canals obturated with bioactive endodontic sealers is important for long-term success. This study compared the volume and porosity of three sealers after initial and long-term storage. The results showed that the porosity of some sealers increased significantly after long-term storage, which could compromise the success of endodontic treatments.
Article
Optics
Wanying He, Peng Yao, Dongkai Chu, Huiqiang Sun, Qingguo Lai, Qingwei Wang, Pengfei Wang, Shuoshuo Qu, Chuanzhen Huang
Summary: This study presents a controllable hydrophilic titanium surface with switchable wettability, achieved by femtosecond laser processing. The transformation from micro-groove to micro-protrusion is realized by adjusting laser processing parameters, and the formation mechanism is explored. The micro-protrusion array shows better hydrophilicity compared to the micro-groove array and can maintain it even after long-term use.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
M. H. Nie, P. F. Jiang, X. R. Li, Z. H. Zhang
Summary: The issue of intermetallic compounds (IMC) in the joining of 316 with NiTi was studied, and bioinspired sandwich architectures were introduced by fabricating a 316-CuNiTi heterogeneous alloy. The experimental results showed that the surface of the prepared samples mainly consisted of intermetallic compound phases such as Ti2Cu, Ni3Ti and NiTi. The wear mechanism of 316-Cu-NiTi was hybrid wear dominated by adhesive wear, with an average friction coefficient of 0.2, showing a 71% improvement compared to 316SS substrate.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Environmental
Ling Wu, Ji Tan, Shuhan Chen, Xuanyong Liu
Summary: This study constructed a novel NiTi alloy surface embedded with cuprous nitride/copper nanoparticles (Cu3N/Cu NPs) and demonstrated excellent antibacterial abilities against both Gram-negative and positive bacteria. It also showed an enhancing effect on the adhesion and proliferation of human umbilical vein endothelial cell.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Geochemistry & Geophysics
Jiabin Liang, Maxim Lebedev, Boris Gurevich, Christoph Hermann Arns, Stephanie Vialle, Stanislav Glubokovskikh
Summary: The study investigates the pressure dependency of intact sandstone samples using X-ray micro-Computed Tomography imaging and novel deformation detection methods. The results show a high level of accuracy in detecting pressure-induced changes in the elastic properties of the samples. Image segmentation and porosity analysis further confirm the findings, contributing to a better understanding of the mechanical behavior of sandstones under varying pressures.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Dentistry, Oral Surgery & Medicine
Mira Huefner, Nicole Rauch, Beryl Schwarz-Herzke, Ivonne Jeanette Knorr, Martin Sager, Dieter Drescher, Kathrin Becker
Summary: The study found that peri-implant vessel thickness and density were associated with force magnitude in the early loading phase, but this effect diminished after 8 weeks of loading.
JOURNAL OF CLINICAL PERIODONTOLOGY
(2022)
Article
Materials Science, Coatings & Films
Keigo Tanaka, Takuto Yamaguchi
Summary: A direct observation technique using quartz glass visualized the bubble generation processes inside a molten pool during laser cladding. The processes differed between the cladding of Inconel 625 and WC-12 wt% Co powders.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
MengJie Luo, Ruidi Li, Dan Zheng, JingTao Kang, HuiTing Wu, ShengHua Deng, PengDa Niu
Summary: Ni51Ti49 alloy with high homogeneity was additively manufactured using laser-directed energy deposition (DED). It was observed that the DED process leads to a gradient distribution of precipitates and preferential formation of precipitates in the columnar zone. The alloy's phase transition temperature and mechanical properties varied with the height of the sample.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2023)
Article
Automation & Control Systems
Kian Zarghami, Saeed Khademzadeh, Nader Parvin, Yashar Azarmehr
Summary: The research utilized Ni50.8Ti49.2 pre-alloyed powder and mu DMD process to produce NiTi shape memory alloy coatings on stainless steel 316L substrate. The study found that scanning velocity and laser power significantly affected coating quality, with cracks forming at lower scanning speeds.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Review
Dentistry, Oral Surgery & Medicine
George Michelinakis, Dimitrios Apostolakis, Phophi Kamposiora, George Papavasiliou, Mutlu Oezcan
Summary: The narrative review examined the applicability of IOS procedures for single and multiple fixed implant restorations, reporting high accuracy and good clinical outcomes. Studies showed that IOS was accurate for single and multiple implant sites, with promising results for single-implant restorations manufactured digitally over a 3-5 year follow-up period.
Article
Energy & Fuels
Rik Van Dyck, Alexandros Prapavesis, Tom Borgers, Jonathan Govaerts, Jef Poortmans, Aart W. van Vuure
Summary: The X-ray (micro-)computed tomography is a non-destructive and relatively fast visualization method for photovoltaic interconnection research. It can detect small cavities and display interconnection structures, providing valuable information for interconnection technology development.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Chemistry, Physical
Yanhua Shao, Jiuxuan Zhang, Hong Jiang, Rizhi Chen
Summary: A nitrogen-doped carbon material with abundant mesopores and high content of graphitic nitrogen was synthesized by annealing a core-shell precursor. The proportion of mesopores and nitrogen species in the material can be controlled by adjusting the etching amount and time of nickel nitrate. The as-prepared Pd@CN-1.4-30 catalyst exhibited superior catalytic performance in the hydrogenation of phenol to cyclohexanone, and its TOF value was about ten times higher than Pd@CN without nickel etching, due to the presence of abundant mesopores, high graphitic N content, and easy reduction of palladium species. Moreover, Pd@CN-1.4-30 showed good reusability for at least six reaction cycles.
APPLIED CATALYSIS A-GENERAL
(2023)
Article
Engineering, Chemical
Meisam Farzaneh, Henrik Strom, Filippo Zanini, Simone Carmignato, Srdjan Sasic, Dario Maggiolo
Summary: The study presents pore-scale simulations of two-phase flows in a reconstructed fibrous porous layer, quantitatively analyzing the dynamics and identifying dominant fluid structures governing mass transport. The significant variations in the microscopic morphology of the fibrous layer have important effects on pore invasion dynamics. These results are significant for the optimal design of face masks to mitigate the current COVID-19 pandemic.
TRANSPORT IN POROUS MEDIA
(2021)
Article
Engineering, Manufacturing
Mandana Moshiri, Dario Loaldi, Filippo Zanini, Damiano Sgaravato, Simone Carmignato, Guido Tosello
Summary: This study analyzed the possibilities and limitations of metal additive manufacturing in plastic injection molding tool applications, showing the potential to limit post-processes and the opportunities for insert production. The results demonstrated that the surface texture of the built cavity with MAM was comparable to that of electrical discharge machining, achieving a replication fidelity higher than 95% in plastic injection molded samples.
JOURNAL OF MANUFACTURING PROCESSES
(2021)
Article
Automation & Control Systems
Kian Zarghami, Saeed Khademzadeh, Nader Parvin, Yashar Azarmehr
Summary: The research utilized Ni50.8Ti49.2 pre-alloyed powder and mu DMD process to produce NiTi shape memory alloy coatings on stainless steel 316L substrate. The study found that scanning velocity and laser power significantly affected coating quality, with cracks forming at lower scanning speeds.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Seyed Kiomars Moheimani, Azadeh Keshtgar, Saeed Khademzadeh, Morteza Tayebi, Ali Rajaee, Abdollah Saboori
Summary: This study investigated the dry sliding wear properties of AZ31 magnesium alloy and B4C-reinforced AZ31 composites with bimodal sizes. The results showed that the hardness of the composites increased with the reinforcement content when the distribution of B4C particles was uniform. The composites with 5 and 10 wt.% B4C exhibited significantly higher wear resistance in all conditions, while the composite with 20 wt.% B4C had lower resistance at high sliding speeds and high loadings. The highest wear resistance was observed at high sliding speeds and low loadings, with oxidative wear as the dominant mechanism.
JOURNAL OF MAGNESIUM AND ALLOYS
(2022)
Article
Engineering, Manufacturing
Saeed Khademzadeh
Summary: Nickel-titanium (NiTi) alloy is promising for biomedical applications due to its unique functional properties. Research shows that post process age hardening heat treatment significantly affects phase transformation temperatures of NiTi built using micro-laser powder bed fusion. Precision additive manufacturing of single-phase NiTi is achievable by applying different process parameters to reduce deviations in lattice structures.
PROGRESS IN ADDITIVE MANUFACTURING
(2022)
Article
Metallurgy & Metallurgical Engineering
E. Hosseini, M. Amirjan, N. Parvin
Summary: Three novel brazing powders were produced using the mechanical alloying method, and the effects of cobalt and chromium on the properties of the powders and joints were investigated. The addition of cobalt improved the morphology of the powders and increased the solidus, while chromium shifted the melting range to higher temperatures. The powder with 6% cobalt and 14% chromium exhibited higher solidus and a wider melting range than the commercial powder, making it suitable for high temperature applications. The results also showed that the addition of chromium and cobalt significantly enhanced joint strength. Therefore, the synthesized brazing powders are excellent candidates for high temperature and corrosive environments.
Article
Chemistry, Physical
Saeed Khademzadeh, Claudio Gennari, Andrea Zanovello, Mattia Franceschi, Alberto Campagnolo, Katya Brunelli
Summary: This study investigated the microfabrication of Ni-based superalloy Inconel 718 through laser powder bed fusion (LPBF) technique, and examined the mechanical behavior of heat-treated samples. The results showed that using optimum input energy density led to a homogenous distribution of particles, and the ageing temperature played a crucial role in the mechanical strength.
Article
Materials Science, Multidisciplinary
Arshad Yazdanpanah, Mattia Franceschi, Reynier I. Revilla, Saeed Khademzadeh, Iris De Graeve, Manuele Dabal
Summary: The stress corrosion cracking (SCC) behavior of L-PBF processed alloy 718 in a chloride-containing solution was investigated using the microcapillary method under constant tensile loading. The results were compared with conventionally produced counterparts, and it was found that the L-PBF specimens exhibited superior corrosion and SCC resistance under tensile loading.
Article
Materials Science, Multidisciplinary
Ali Zandifar, Mostafa Amirjan, Nader Parvin
Summary: A nickel-based brazing paste was prepared and characterized in this study. Mechanical alloying method and commercial IN625 powder were used to prepare the brazing paste and perform wide gap brazing of IN738. The water-based binder was optimized using the Taguchi method. The study found that the number of chromium-rich boride phases increased as the filler metals' low melting point particles (LMPs) increased. The optimal composition of the binder included 82.6 wt.% distilled water, 12.4 wt.% glycerin, 2.5 wt.% mineral oil, and 2.5 wt.% CMC. The preferable joints with minimum porosity were achieved using a filler composition containing 40 and 50 wt.% LMPs.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
M. R. Kamranfard, H. Darijani, S. Khademzadeh
Summary: This study investigates the mechanical behavior of lattice structures produced by the Laser Powder Bed Fusion process, focusing on four different topologies. It found that lattice structures with I-shaped cross-section struts exhibited higher stiffness and strength.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
M. R. Kamranfard, H. Darijani, H. Rokhgireh, S. Khademzadeh
Summary: This paper examines the mechanical behavior of lattice structures composed of different unit cells using the finite element method. The elastic behavior of a cubic lattice structure under compressive loading is investigated, and the stiffness-to-weight ratio of the structure is optimized.
Article
Materials Science, Multidisciplinary
Amir Ijadi, Behzad Nayebi, Nader Parvin, Ali Kaflou
Summary: The study investigates the interfacial phenomena and their influence on the sintering behavior, microstructure, and mechanical properties of porous stainless steel 316L containing Sn additive. The sintering process was carried out at different temperatures (1250°C and 1300°C) under a nitrogen atmosphere. It was found that the presence of Sn improved atomic diffusion through liquid phase sintering, but negatively affected neck formation. The best combination of mechanical properties was achieved in the samples containing 2 wt% Sn. Fracture investigations, phase analysis, and EDS elemental analysis were conducted to discuss the obtained mechanical properties and compressive strength of the samples.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Lokesh Chandrabalan, Markus Baier, Roberto Meloni, Marco Pieri, Luca Ammannato, Eugenio Del Puglia, Simone Carmignato
Summary: Metal additive manufacturing, especially laser powder bed fusion, is used more and more in the gas turbine industry for creating small diameter channels. This paper proposes a new method to evaluate the geometrical and functional equivalent diameters of cylindrical channels and the roughness on the internal surface using X-ray computed tomography. The method was validated with experimental flow tests, providing a faster approach compared to traditional flow tests.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Kaveh Rahimi Mamaghani, Nader Parvin
Summary: The cold sintering process was successfully used to produce high relative density (>90%) ZnO/MoS2 nanocomposite. The removal of solvent and absence of secondary phase or unknown component in the cold-sintered ZnO/MoS2 nanocomposite was confirmed. A new three-component solvent (acetic acid-DMSO-water) with enhanced viscosity was found to improve the distribution of MoS2 nanoparticles in ZnO powders. The addition of MoS2 nanoparticles slightly reduced the final density of the nanocomposite, but enhanced its visible light absorption.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Kaveh Rahimi Mamaghani, Nader Parvin
Summary: The ZnO/MoS2 nanocomposites were prepared using a three-component solvent and a cold sintering process, resulting in high-density bulks (>90%). The inclusion of 1-5% MoS2 nanoparticles in the material affected its mechanical properties (strength, elastic modulus, fracture toughness, and hardness) and tribological properties (mass loss, friction coefficient, and wear rate). The addition of 1% MoS2 improved the hardness and fracture toughness of the nanocomposite by 2.22 GPa and 2.33 MPa·m, respectively, and increased the wear resistance by 23% (1.55x10-5 mm3/N·m). However, higher concentrations of MoS2 nanoparticles led to a decrease in mechanical properties, although the friction coefficient of the nanocomposite decreased proportionally with MoS2 enhancement, reaching a minimum of 0.26. The presence of MoS2 nanoparticles promoted the adhesive mechanism despite producing smoother surfaces.
