Article
Materials Science, Characterization & Testing
Halil Kilic, Cenk Misirli, Ibrahim Mutlu
Summary: The comparative research on the Mo/NiCrBSi coated automobile brake disc showed that the coating has good bonding strength, comparable coefficient of friction, and lower wear compared to the reference disc. The addition of ductile phases in the coating was found to effectively reduce the coefficient of friction to an acceptable degree while improving wear resistance.
Article
Materials Science, Coatings & Films
Mohsen Aliabadi, Farzad Khodabakhshi, Reza Soltani, Adrian P. Gerlich
Summary: Wear-resistant coatings are vital in various industries for prolonging component lifespan and reducing costs. NiCrBSi coatings are widely used for wear resistance and can be applied by both welding and thermal spray processes. This study investigates the effects of friction-stir processing (FSP) and furnace re-melting (FR) on the microstructure and wear properties of a NiCrBSi coating on carbon steel.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Songqiang Huang, Jingzhong Zhou, Kuoteng Sun, Hailiang Yang, Weichen Cai, Yi Liu, Ping Zhou, Shuangjie Wu, Hua Li
Summary: This paper focuses on clarifying the mechanisms of the microstructure influencing the acid corrosion and mechanical characteristics of Nickel-base composite coatings. The formation mechanisms of the amorphous phase of flat particles during the plasma spray process were studied, and the corrosion structure and phase evolution of the coating in the accelerated corrosion experiment were directly visualized. Finally, the mechanical properties of the amorphous NiCrBSi coatings were measured to elucidate the relative influence of the surface features on acid corrosion responses and wear resistance.
Article
Materials Science, Coatings & Films
Amit Kumar Singh, Deepali Atheaya, Rajnesh Tyagi, Vinayak Ranjan
Summary: The study investigates the low friction and wear performance of coatings containing silver and hexagonal boron nitride at temperatures ranging from room temperature to 800°C. The synergistic effect of silver and hexagonal boron nitride leads to the lowest wear rate and coefficient of friction.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Jie Zhou, Weiling Guo, Dongyu He, Yanfei Huang, Zhenbing Cai, Longlong Zhou, Zhiguo Xing, Haidou Wang
Summary: Magnetic field-assisted ultrasonic plasma spraying technology improves the integrity, mechanical properties, and wear resistance of coatings, reducing thermal stress and accelerating solidification. Pulsed magnetic field also refines grain, promotes even distribution of hard ceramic phase, and creates a dense internal structure.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Sima A. Alidokht, Richard R. Chromik
Summary: Metal matrix composites reinforced with WC particles and Co or Ni matrices are known for their unique combination of hardness, toughness, and superior wear performance. This study focused on Ni-WCNi composite coatings and found that coatings with higher WC fill ratios displayed better wear resistance due to the uniform distribution of WC particles and shorter mean free path reducing adhesive wear. However, at higher loads, subsurface crack propagation at WC particle interfaces led to a reduction in the protective role of mechanically mixed layers. Scratch tests were used to qualitatively compare coating cohesion strengths and correlate them to wear properties.
Article
Materials Science, Coatings & Films
Dipanjan Dey, Sagar Sarkar, Sunil Rawal, Anitesh Kumar Singh, Kalinga Simant Bal, Manideep Khande, Ashish Kumar Nath, Asimava Roy Choudhury
Summary: This study developed laser coatings of pure NiCrBSi as well as with the addition of lubricious Ag or WS2 on Ti6Al4V substrate. Real-time thermal history was monitored and correlated with the tribological properties of the coating. The study found that low heat input increased the lubricious phase in the coating and decreased the friction coefficient.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Engineering, Chemical
Yudong Fang, Xuemei Chen
Summary: The effect of nano-La2O3 and Mo on the wear resistance of laser cladding coating was investigated. It was found that the Mo-La2O3-Ni60a/SiC composite coating exhibited the best wear resistance. The addition of nano-Mo and La2O3 improved the toughness and compactness of the coating, resulting in a refined microstructure. The wear mechanism of the coating mainly involved adhesive wear, abrasive wear, and oxidation wear.
Article
Multidisciplinary Sciences
Palash Biswas, Suman Kalyan Das, Prasanta Sahoo
Summary: Duplex Ni-P/Ni-Mo-P coating systems were developed using the electroless dual bath technique. The effect of heat treatment on the microstructural characteristics, microhardness, friction, wear, and corrosion behavior of the coatings was investigated. Heat treatment improved the hardness and corrosion performance of the coatings, but prolonged high temperature treatment resulted in surface cracks and plastic deformation.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Jie Zhou, Yanfei Huang, Zhenbing Cai, Gengchao He, Keren Xu, Yue Chen, Zhiguo Xing, Haidou Wang
Summary: By utilizing a stable magnetic field assisted supersonic plasma spraying technology, the wear resistance of Ni-based coatings is enhanced. The uniform distribution of hard phase and reduction of defects in the coatings contribute to the excellent wear resistance.
MATERIALS CHARACTERIZATION
(2022)
Article
Polymer Science
Najoua Barhoumi, Kaouther Khlifi, Abderrahim Maazouz, Khalid Lamnawar
Summary: To increase the lifetime of metallic molds and protect their surface from wear, a fluorinated ethylene propylene (FEP) polymer was coated onto a stainless-steel (SS304) substrate. The FEP coating exhibited a smooth and dense microstructure with high adhesion to SS304. It also displayed good mechanical properties, low friction coefficient, low wear coefficient, and provided satisfactory corrosion protection.
Article
Engineering, Mechanical
Reza Tima, Farzad Mahboubi
Summary: The effect of heat treatment and plasma nitriding post-processes on medium and high boron electroless nickel coatings was investigated, showing that plasma nitrided coatings had significantly higher microhardness and improved tribological behavior compared to heat treated ones.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Xinsheng Wang, Zhiguo Xing, Junjian Hou, Wenbin He, Kun Liu
Summary: This study prepared four kinds of coatings on 45# steel substrate using Supersonic plasma spraying (SPS) technology. It found an increase in ceramic particles, improved wear resistance and corrosion performance of the coatings, and decreasing hardness of N6WA with increased coating distance while maintaining good wear resistance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Engineering, Mechanical
Niveditha Noble, N. Radhika, M. Sathishkumar, Bassiouny Saleh
Summary: The AlCoCrFeNi HEA powder was synthesised using gas atomisation and coated onto SS316L stainless steel substrate. The synthesised HEA powder exhibited spherical morphology with a mean particle size of 20 μm and a BCC crystal structure. The coated samples displayed uniform coating and homogenous distribution of HEA, resulting in an increment of 2.46 times in microhardness and improved wear resistance and corrosion resistance compared to the uncoated samples.
TRIBOLOGY INTERNATIONAL
(2023)
Article
Materials Science, Coatings & Films
Yajie Guan, Chi Zhang, Xiufang Cui, Di Chen, Jian Li, Xinyao Li, Litong Feng, Guo Jin
Summary: This study prepared in-situ HEA composite coatings with a gradient eutectic degree using the principle of element diffusion in the molten pool under a laser beam, namely Mo-CC and Nb-CC. The coatings were composed of the FCC phase and Laves phase, showing different phase compositions and orientation relationships. The study elucidated the process and mechanism of phase transformation while providing insights for the development of new HEA coatings.
SURFACE & COATINGS TECHNOLOGY
(2023)
Review
Chemistry, Physical
Ismail Luhar, Salmabanu Luhar, Mohd Mustafa Al Bakri Abdullah, Andrei Victor Sandu, Petrica Vizureanu, Rafiza Abdul Razak, Dumitru Doru Burduhos-Nergis, Thanongsak Imjai
Summary: Across the world, proper management of radioactive waste generated from activities associated with the nuclear fuel cycle is essential to ensure the sustainability of the nuclear industry and protect human health and the environment. Cement solidification/stabilization (S/S) is widely used for the encapsulation and disposal of radioactive waste due to its excellent structural strength and radiation shielding effects. In order to improve the performance of cemented waste, extensive efforts have been made to enhance cementation technology and develop special types of cement. This paper reviews the technology and challenges of cement solidification/stabilization of radioactive waste, and discusses modern cement technologies and their applications in the immobilization of hazardous radioactive waste.
Article
Chemistry, Physical
Siti Faqihah Roduan, Juyana A. Wahab, Mohd Arif Anuar Mohd Salleh, Nurul Aida Husna Mohd Mahayuddin, Mohd Mustafa Al Bakri Abdullah, Aiman Bin Mohd Halil, Amira Qistina Syamimi Zaifuddin, Mahadzir Ishak Muhammad, Andrei Victor Sandu, Madalina Simona Baltatu, Petrica Vizureanu
Summary: This paper investigates the influence of a dimple-microtextured copper substrate on the performance of Sn-0.7Cu solder alloy. Dimples with a diameter of 50 μm were created by varying the laser scanning repetitions, while the spacing between the dimples was kept constant at 100 μm. The solder joints' wettability, microstructure, and growth of intermetallic compound (IMC) layer were analyzed to assess the impact of the dimple-microtextured copper substrate. Increasing the laser scan repetitions deepened the dimples, resulting in higher surface roughness. The solder joints exhibited decreased contact angle and increased IMC thickness with increasing dimple depth. The copper element was more evenly distributed in the dimple-microtextured copper substrate compared to the non-textured counterpart.
Article
Chemistry, Physical
Chirawat Wattanapanich, Thanongsak Imjai, Reyes Garcia, Nur Liza Rahim, Mohd Mustafa Al Bakri Abdullah, Andrei Victor Sandu, Petrica Vizureanu, Petre Daniel Matasaru, Blessen Skariah Thomas
Summary: This article numerically analyzes the behavior of prestressed reinforced concrete slabs strengthened with externally bonded fiber-reinforced polymer (FRP) sheets. The study finds that increasing the thickness or elastic modulus of the FRP strengthening affects the bonding efficiency and can lead to earlier debonding failures. A tapering technique is proposed to reduce stress concentrations and improve overall strengthening performance. The tapering successfully reduces bond stress concentrations by up to 15% and helps prevent concrete rip-off and peel-off debonding failures.
Review
Crystallography
Fabian Cezar Lupu, Corneliu Munteanu, Adrian Constantin Sachelarie, Vlad Nicolae Arsenoaia, Bogdan Istrate
Summary: This paper analyzes the improvement of the characteristics of different steels under extreme operating conditions, including those used in the manufacture of military components, bearings, and other parts. The use of cold spraying technology, which processes particles in a solid state, has proven to be an effective technique for improving material properties. The accelerated particles are deposited at values below their melting point, adhering to the surface instead of eroding it.
Article
Materials Science, Multidisciplinary
Liyana Jamaludin, Rafiza Abd Razak, Mohd Mustafa Al Bakri Abdullah, Petrica Vizureanu, Andrei Victor Sandu, Shayfull Zamree Abd Rahim, Romisuhani Ahmad
Summary: The aim of this study is to investigate the optimum solid-to-liquid ratio of metakaolin geopolymer paste added with TiO2 and ZnO for improved adhesion strength. Different design parameters were tested to optimize the performance of metakaolin-based geopolymer as a coating material. The activated metakaolin was mixed with sodium hydroxide and sodium silicate as alkali activator, and titanium dioxide and zinc oxide as photocatalyst substances. The best mix proportion for coating application was found to be a solid-to-liquid ratio of 0.6, resulting in the highest adhesion strength (19 MPa) and enhanced geopolymer properties.
Article
Materials Science, Multidisciplinary
Mihai Axinte, Petrica Vizureanu, Nicanor Cimpoesu, Carmen Nejneru, Diana-Petronela Burduhos-Nergis, Elena-Luiza Epure
Summary: The plasma nitriding edge effect occurs on parts with sharp edges due to the discharge of negative light at the intersection of two adjacent faces. This effect can disrupt the general process. In this study, samples with different angles were analyzed to investigate the reduction of the edge effect on non-uniformity. The influence of active screens on hardness, SEM and EDX analyses, nanoindentation and scratch tests, and contact angle measurements was also examined.
Article
Electrochemistry
Umapathi Krishnamoorthy, Parimala Gandhi Ayyavu, Hitesh Panchal, Dayana Shanmugam, Sukanya Balasubramani, Ali Jawad Al-rubaie, Ameer Al-khaykan, Ankit D. Oza, Sagram Hembrom, Tvarit Patel, Petrica Vizureanu, Diana-Petronela Burduhos-Nergis
Summary: In this paper, one-dimensional modeling of Li-ion and NiMH batteries was developed and their performances were studied. The electrolyte concentration profile and associated losses were found to greatly affect the performance of the batteries. Li-ion batteries exhibit a drooping behavior at the start of the discharge cycle due to concentration polarization, while NiMH batteries show a rising behavior throughout the discharge cycle. The losses associated with NiMH batteries are larger and more constant compared to Li-ion batteries.
Review
Chemistry, Physical
Nur Bahijah Mustapa, Romisuhani Ahmad, Wan Mastura Wan Ibrahim, Mohd Mustafa Al Bakri Abdullah, Nuttawit Wattanasakulpong, Ovidiu Nemes, Andrei Victor Sandu, Petrica Vizureanu, Ioan Gabriel Sandu, Christina W. Kartikowati, Puput Risdanareni
Summary: There is a growing global demand for ceramic materials with applications in various industries. The conventional approach has limitations such as high temperature requirements and issues with agglomeration. Researchers have shown interest in using geopolymer to produce ceramics due to its ability to lower sintering temperature and improve strength. The review aims to study the effects of sintering mechanisms on the crystallization and strength of geopolymer ceramics, and presents future research opportunities.
Editorial Material
Chemistry, Physical
Andrei Victor Sandu
Summary: This editorial highlights the results of the second Special Issue dedicated to obtaining and characterizing new materials, which includes one review paper and 13 research articles. The most important fields covered are materials in civil engineering, focusing on geopolymers, insulating materials, and developing new methods. Other important fields include materials for environmental issues and human health.
Article
Chemistry, Physical
Bogdan Istrate, Corneliu Munteanu, Madalina-Simona Baltatu, Ramona Cimpoesu, Nicoleta Ioanid
Summary: In recent years, significant progress has been made in the development of biodegradable materials, particularly magnesium alloys. This study focused on examining the microstructure and corrosion resistance of a new experimental Mg-based biodegradable alloy with different percentages of Zn. The findings revealed the presence of dendritic Mg solid solution, lamellar Mg2Ca compound, and MgZn2 intermetallic phase. The corrosion rate was similar regardless of zinc percentage, with higher percentages exhibiting a more protective zinc oxide surface layer.
Article
Chemistry, Physical
Normah Kassim, Shayfull Zamree Abd Rahim, Wan Abd Rahman Assyahid Wan Ibrahim, Norshah Afizi Shuaib, Irfan Abd Rahim, Norizah Abd Karim, Andrei Victor Sandu, Maria Pop, Aurel Mihail Titu, Katarzyna Bloch, Marcin Nabialek
Summary: The objective of this study is to identify the accurate design parameter that can be emphasized in producing a sustainable design of EPS cushion packaging. Through the experimental method and design simulation analysis, four main elements were found to necessitate careful consideration: rib positioning, EPS cushion thickness, package layout, and packing size. The results contribute significantly to sustainable design by integrating these elements to reduce and reuse packaging material. As a result, the development cost of the cushion decreased by 48%, mold modification time was significantly saved by 25%, and a 27% reduction in carbon dioxide (CO2) was identified. These findings also aided in the development of a productive packaging design, beneficial to reducing environmental impact and having a significant impact on the manufacturing industry.
Article
Chemistry, Physical
Catalin Panaghie, Georgeta Zegan, Alina Sodor, Nicanor Cimpoesu, Nicoleta-Monica Lohan, Bogdan Istrate, Ana-Maria Roman, Nicoleta Ioanid
Summary: Biodegradable metallic materials have been widely used in medical applications. This paper investigates the corrosion/degradation products of an experimental material (ZnMgY alloy) after immersion tests in three physiological solutions. The results show that the alloy's microstructure strongly influences the corrosion characteristics and the corrosion products mainly include oxides, hydroxides, carbonates or phosphates.
Article
Chemistry, Multidisciplinary
Adriana Elena Valcea, Dorin Grecu, Izabela Maris, Aurelian Denis Negrea, Nicanor Cimpoesu, Daniela Giugea, Bogdan Istrate, Corneliu Munteanu, Sorin Georgian Moga, Daniel-Constantin Anghel, Alin Daniel Rizea, Mircea Ionut Petrescu, Marioara Abrudeanu
Summary: This research focuses on the advanced characterization of a fragment of fresco with good adhesion to the wall and establishes correlations between degradation processes and wall adhesion by analyzing the stratigraphy, microstructure, compaction defects, chemical composition, and variation of chemical composition in the fresco from the pictorial surface to the mortar-sandstone interface.
APPLIED SCIENCES-BASEL
(2023)
Article
Crystallography
Marian Lutcanu, Ramona Cimpoesu, Marioara Abrudeanu, Corneliu Munteanu, Sorin Georgian Moga, Margareta Coteata, Georgeta Zegan, Marcelin Benchea, Nicanor Cimpoesu, Alice Mirela Murariu
Summary: Ceramic coatings with exceptional properties are widely used in industrial and medical applications. In this study, ceramic coatings with a thickness of approximately 45 μm were grown using the atmospheric plasma spraying procedure and subjected to thermal shock cycling. The coatings showed excellent stability at 1000 degrees C but exhibited exfoliation at temperatures above 1800 degrees C.
Article
Chemistry, Multidisciplinary
Dumitru-Doru Burduhos-Nergis, Petrica Vizureanu, Madalina-Simona Baltatu, Andrei-Victor Sandu, Diana-Petronela Burduhos-Nergis
Summary: Bibliometric analysis with different software is the most precise and efficient technique to investigate and analyze the vast scientific data from the field of geopolymers. The network visualization of keywords and authors of published papers in this field is of particular significance. The aim of this study is to present the progress and research interest in geopolymers, especially those reinforced with different types of fibers. According to the data from the Web of Science database, future research directions were presented.
UNIVERSITY POLITEHNICA OF BUCHAREST SCIENTIFIC BULLETIN SERIES B-CHEMISTRY AND MATERIALS SCIENCE
(2023)
