Article
Materials Science, Ceramics
Marcel Rossetti, Gilberto da Silva Falk, Aloisio Nelmo Klein, Sergio Yesid Gomez Gonzalez, Cristiano Binder, Dachamir Hotza
Summary: This work presents a novel technology, Plasma-Assisted Rapid Sintering (PARS), for sintering nanoceramics using a pulsed DC plasma system in a hollow cathode regime. Experiments with nano-TiO2 powders show that PARS heating process is consistent and adjustable, allowing fast and homogeneous sintering with high relative density and nanoscale grains.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Thermodynamics
Thomaz Augusto Guisard Restivo, Raphael Basilio Pires Nonato, Rossana Rossoni Figueira, Odirlei Amaro Ferreira, Claudio Padovani, Norberto Aranha, Denicesar Baldo, Cecilia Guedes e Silva, Michelangelo Durazzo
Summary: Metallic diamond (MD) is a new alloy class with unparalleled hardness surpassing current alloys by more than twofold, reaching up to 2500 HV (kgf mm(-2)). Simple metallurgical principles are employed in the alloy design, using the Lattice Occupancy Project aided by Diamoy 1.0 software to maximize chromium equivalent values and promote body-centred cubic structures. Powder metallurgy techniques are suggested as valid processing routes for forming these challenging alloys into parts. The sintering behavior of the hardest MD-4 and MD-5 alloy powders is studied, with MD-5 showing intense shrinkage and MD-4 exhibiting minimal sintering. MD-5 alloy powder is identified as a promising raw material for tool parts production in competition with cemented carbide hard tools.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Chemistry, Multidisciplinary
Chengwei Wang, Wei Zhong, Weiwei Ping, Zhiwei Lin, Ruiliu Wang, Jiaqi Dai, Miao Guo, Wei Xiong, Ji-Cheng Zhao, Liangbing Hu
Summary: Powder to bulk processing techniques like additive manufacturing and metal injection molding have revolutionized complex metal design and manufacturing. However, they often face challenges like residue stress and slow sintering processes. The ultrafast high-temperature sintering process offers a quick solution for synthesizing and sintering bulk metals and alloys, allowing for rapid screening and development of new metal compositions and structures.
Article
Materials Science, Ceramics
Jian Yang, Haitao Zhang, Yanan Li, Wentao Xu, Youfu Zhou, Maochun Hong
Summary: In this study, single-phase aluminum oxynitride (AlON) powders were successfully synthesized using an improved direct nitridation (DN) method. The improved method, which involves adding high nitrogen pressure, allows for the production of high-quality AlON powders. Transparent AlON ceramics with excellent optical properties were fabricated through pressureless sintering using different particle sizes of α-Al2O3 precursor.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Sheng Qu, Jinlian Li, Zhaoyang Liu
Summary: A modified precipitation method was used to prepare yttria powders for the fabrication of yttria ceramics. The precipitation behavior, phase evolution, and shape of the yttria precursor were examined in the presence or absence of an electric field. The results showed that the yttria precursor had the same phase but different morphology when an electric field was applied.
Article
Materials Science, Ceramics
Ricardo Mineiro, C. M. Fernandes, E. L. Silva, M. R. Soares, D. Figueiredo, B. Ferrari, A. J. Sanchez-Herencia, A. M. R. Senos
Summary: The Spark Plasma Sintering (SPS) technique was used to investigate the sintering process of cBN-TiCN based composites with and without the addition of Ni. The addition of Ni improved the densification of the material, but complete removal of open porosity and transformation of cBN phase to hBN phase only occurred at 1700°C. Other matrix phases, such as TiB2 and Ni3B, were also formed during the sintering process.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Yingying Zhou, Jiayan Zhang, Yide Chen, Shujiang Liu
Summary: The study reveals that increasing sintering temperature can significantly enhance densification, while relatively high translucency can be achieved in conditions with low crystallization tendency. A vacuum atmosphere is beneficial for improving sintering rate and ultimate density, resulting in higher translucency than in an air atmosphere.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2021)
Article
Chemistry, Physical
M. Suarez, D. Fernandez-Gonzalez, L. A. Diaz, F. Diologent, L. F. Verdeja, A. Fernandez
Summary: The study successfully sintered ZrCu39.85Y2.37Al1.8 metallic glass using SPS technology, achieving almost 100% relative density and excellent mechanical properties at 390 degrees C. Sintering at temperatures higher than 390 degrees C resulted in sample crystallization, but the metallic glass shows promise for applications in the jewelry industry.
Article
Materials Science, Multidisciplinary
Shiwei Zhao, Pengfei Yu, Xin Sun, Guodong Sun, Haijia Fu, Wanqi Jie
Summary: This study synthesized Na0.5Bi0.5TiO3 (NBT) nanopowders using a new wet chemical route called sol-hydrothermal method. The effects of hydrothermal reaction conditions on the powder properties were investigated. The results showed that uniformly sized NBT powders with pure phase and good dispersibility were obtained under the optimal reaction conditions. Additionally, a relatively dense NBT ceramic was achieved using electric field assisted flash sintering.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Ahmed Taibi, Salem Chaguetmi, Pedro E. Sanchez-Jimenez, Antonio Perejon, Jose Eduardo Garcia, Hamid Satha, Luis A. Perez-Maqueda
Summary: In this study, the 0.67BiFeO(3)-0.33BaTiO(3) ferroelectric ceramic was prepared through Reaction Flash Sintering (RFS), resulting in a pure perovskite structure with unique bimodal grain size distribution that influenced the electrical properties. Compared to traditional preparation methods, RFS showed benefits in terms of energy consumption and resulted in smaller grain size and slightly different electrical properties.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Jianing Wang, Chaohui Wang, You Wang, Meiling Dong, Yuan You, Zhiyi Rong, Huinan Liu, Xiaodong Zhang, Zhongyu Zhu, Yuhang Wang
Summary: Yb2Si2O7 powders doped with SiC whisker were prepared as feed stocks for environmental barrier coatings through ball milling, spray drying, and vacuum sintering. The particle size of the powder can be optimized by adjusting the spray drying parameters. Vacuum sintering improves the density and flowability of the powders, while the SiC whisker maintains its original morphology.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
M. Ortega Varela de Seijas, A. Bardenhagen, T. Rohr, E. Stoll
Summary: To date, the debinding and sintering of parts fabricated through MEX have been done in a time-consuming and disconnected approach. This study introduces a hybrid device that combines MEX with local debinding and sintering, enabling the removal of binder matrix and sintering within the same volume efficiently. The results show promising improvements compared to conventional methods, with simplified processing and avoidance of toxic agents and expensive post-processing equipment.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Dongjiang Zhang, Rui Yu, Xuelei Feng, Xuncheng Guo, Yongkang Yang, Xiqing Xu
Summary: In this study, Al2O3 nanoceramics were synthesized through spark plasma sintering (SPS) of amorphous and polycrystalline powders with similar particle sizes. The sintering processes and resulting products were compared based on the starting powder conditions. The threshold temperature for achieving near-full density of the Al2O3 nanoceramics was found to be 1450°C for polycrystalline powders and 1300°C for amorphous powders. The nanoceramics prepared from amorphous powders exhibited a mean grain size of 170 nm and superior mechanical properties, including high bending strength, Vickers hardness, and fracture toughness. Additionally, they showed larger dynamic strength and dynamic strain compared to those prepared from polycrystalline powders. The toughening mechanism was explained based on the separation of quasi-boundaries.
Article
Chemistry, Physical
Traian Florin Marinca, Bogdan Viorel Neamtu, Florin Popa, Amalia Mesaros, Ionel Chicinas
Summary: This paper proposes a feasible synthesis route for obtaining alumina matrix soft magnetic composites (SMCs). By mechanical alloying and spark plasma sintering technique, alumina matrix SMCs with enhanced magnetic performance were successfully prepared. The results showed that the magnetic characteristics of the composite were stable under different testing frequencies, indicating a promising potential for further development of such magnetic composites.
Article
Engineering, Chemical
Daniele Sofia, Domenico Macri, Diego Barletta, Paola Lettieri, Massimo Poletto
Summary: This study examines the selective laser sintering of Titania powders to understand the impact of initial material properties and process conditions on the degree of sintering/melting and mechanical properties of the produced semi-3D artefact. Experimenting with different particle sizes, the research evaluates the effects of process variables such as laser power and scan speed on product properties, and uses measured tensile strength to estimate the size of sintered necks. Results are compared with values predicted by literature models to provide insights into the SLS process.
Article
Materials Science, Multidisciplinary
Somen K. Bhudolia, Goram Gohel, Elisetty Shanmuga Bala Subramanyam, Kah Fai Leong, Pierre Gerard
Summary: Current research has shown that fully thermoplastic and hybrid composite helmets exhibit significantly higher energy absorption capabilities compared to polycarbonate helmets, leading to improved safety. The usage of composite shells minimizes energy transfer to the foam attached to the human head, reducing the risk of critical and fatal head injuries.
MATERIALS & DESIGN
(2021)
Article
Engineering, Manufacturing
Xuhui Zhang, Zhen Xiao, Wenhui Yu, Chee Kai Chua, Lihua Zhu, Zongshen Wang, Peng Xue, Shuai Tan, Yongling Wu, Hongyu Zheng
Summary: The study on Er-modified 7075 aluminum alloy showed that the addition of Er can reduce crack density but increase porosity, with Er existing in the form of unmelted particles and sub-micrometer scale Al3Er. The deterioration of fluidity in the molten pool due to Er particles leads to higher porosity, while the coherency between aluminum matrix and Al3Er favors grain refinement and crack reduction.
VIRTUAL AND PHYSICAL PROTOTYPING
(2022)
Article
Materials Science, Composites
Goram Gohel, Somen K. Bhudolia, Kah Fai Leong, Pierre Gerard
Summary: This research investigates the damping response of hollow tubular structures using a novel acrylic liquid thermoplastic Elium resin and different carbon fiber reinforcement materials. The results show that the use of the new materials increases the damping of the structure, with carbon fiber reinforcement having a greater effect on damping enhancement. Additionally, the thickness of the tube has a positive effect on damping, while an increase in fiber volume fraction has a negative effect.
COMPOSITES COMMUNICATIONS
(2022)
Review
Materials Science, Multidisciplinary
Hong Wei Tan, Yu Ying Clarrisa Choong, Che Nan Kuo, Hong Yee Low, Chee Kai Chua
Summary: In recent years, the 3D printed electronics technology has attracted significant attention from industries and researchers due to its unique features. This review provides an in-depth overview of the latest 3D electronic printing techniques, innovative practical technologies, and upcoming application trends in advanced functional materials for fabricating 3D printed electronics devices.
PROGRESS IN MATERIALS SCIENCE
(2022)
Article
Polymer Science
Somen K. Bhudolia, Goram Gohel, Durga Vasudevan, Kah Fai Leong, Pierre Gerard
Summary: The research aims to enhance the performance and process of tubular composites, showing that composite tubes with acrylic Elium resin have higher bending strength than those with epoxy resin, with distinct failure modes identified through detailed microscopic investigation.
Article
Polymer Science
Goram Gohel, Chun Zhi Soh, Kah Fai Leong, Pierre Gerard, Somen K. Bhudolia
Summary: This research focuses on the optimization of ultrasonic welding of carbon/epoxy composite and carbon/ Elium(R) composite using a PMMA coupling interlayer. The results show that the welding strength can be significantly improved by creating a PMMA coupling layer on the epoxy composite adherend. The welding time can be reduced to 2s compared to the 10 min required for adhesive bonding. The investigation also reveals the characteristics of the fracture surface for the configuration with maximum lap shear strength. This research presents a way to join Elium(R) with epoxy composites and has potential applications in sporting goods and consumer products.
Article
Engineering, Manufacturing
Che Nan Kuo, Yu Ping Wang, Chee Kai Chua
Summary: Metal additive manufacturing technologies have been widely used in aerospace and medical device industries. Porous materials have been extensively studied due to the maturity of such technologies. This study explores the relationship between the mechanical properties of porous materials and factors like surface roughness and ratio between surface roughness and strut diameter. It also investigates the formulation development of an electrolyte with a surfactant to enhance the surface finish during the electropolishing process of 3D printed Ti-6Al-4V porous materials.
VIRTUAL AND PHYSICAL PROTOTYPING
(2022)
Article
Chemistry, Applied
Yi Zhang, Amelia Yilin Lee, Kanitthamniyom Pojchanun, Cheng Pau Lee, Aiwu Zhou, Jia An, Michinao Hashimoto, U-Xuan Tan, Chen Huei Leo, Gladys Wong, Chee Kai Chua, Aakanksha Pant
Summary: Three-dimensional food printing can help consumers accept and consume alternative proteins more easily by printing final products that resemble familiar natural foods in terms of taste, texture, and appearance. This study focuses on optimizing multicomponent food inks fortified with alternative proteins for 3D printing using response surface methodology (RSM). The addition of xanthan gum as a shear thinning and hydrating agent optimized the printability and syneresis of the six protein inks. This RSM-based approach has the potential to be widely adopted in 3D food printing.
FOOD HYDROCOLLOIDS
(2022)
Article
Polymer Science
Somen K. Bhudolia, Goram Gohel, Durga Vasudevan, Kah Fai Leong, Pierre Gerard
Summary: This research studied the delamination behavior of hybrid carbon-thermoplastic fabrics in conjunction with liquid thermoplastic acrylic Elium (R) resin under Mode I and Mode II loading. The experimental results showed that the hybrid fiber reinforced thermoplastic composites exhibited improved delamination behavior compared to carbon-epoxy composites. However, the hybrid fiber architecture was found to have detrimental effects on the delamination behavior.
Article
Biochemistry & Molecular Biology
Chen Huei Leo, Su Yi Foo, Joseph Choon Wee Tan, U-Xuan Tan, Chee Kai Chua, Eng Shi Ong
Summary: This study aims to extract bioactive compounds from orange peel waste (OPW) using a green extraction method called pressurized hot water extraction (PHWE). The results showed that extraction temperatures of 60 degrees C and 80 degrees C yielded distinct bioactive compounds with better antioxidant capacity. Specifically, treatment with 60 degrees C OPW extracts inhibited vascular inflammation and endothelial dysfunction in vitro, suggesting its vasoprotective effects mediated by anti-inflammatory effects.
Review
Engineering, Biomedical
Jessica Mancilla-De-la-Cruz, Marisela Rodriguez-Salvador, Jia An, Chee Kai Chua
Summary: This paper presents the use of 3D printing technology in drug delivery applications. The different variations of the technique according to characteristics, materials, and dosage forms are discussed. The seven main categories of 3D printing and the most frequent materials used are introduced. The paper also explores different forms of drug dosage and provides insights for those interested in the advancement of drug delivery and the development of 3D printing applications in this area.
INTERNATIONAL JOURNAL OF BIOPRINTING
(2022)
Article
Engineering, Biomedical
Amedeo Franco Bonatti, Giovanni Vozzi, Chee Kai Chua, Carmelo De Maria
Summary: This paper proposes a deep learning-based control loop for extrusion-based bioprinting that automatically optimizes printing parameters and monitors the printing process online. By collecting a comprehensive dataset and training a machine learning model, the authors demonstrate the automation of quality control in the bioprinting process.
INTERNATIONAL JOURNAL OF BIOPRINTING
(2022)
Article
Engineering, Manufacturing
Aakanksha Pant, Phoebe Xin Ni Leam, Chee Kai Chua, U-Xuan Tan
Summary: Food waste utilisation and zero waste approach are effective ways to promote a sustainable economy. Three-dimensional food printing (3DFP) can help turn food waste into value-added products that resemble familiar consumables. In this study, spinach stems and kale stalks were used to formulate food inks that were tested for their rheological properties and suitability for dysphagia patients. The research demonstrates a promising method of converting vegetable waste into aesthetically pleasing edible diets through 3DFP.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Engineering, Manufacturing
Cherq Chua, Swee Leong Sing, C. K. Chua
Summary: This study uses finite element analysis to investigate the mechanical performance of in-situ alloyed titanium-tantalum lattice structures fabricated using laser powder bed fusion. The study finds that both simulation methods accurately predict the elastic modulus, but underestimate the yield strength. Additionally, the study shows that the performance of uniform lattice structures agrees with the Gibson-Ashby model, and suggests that more information on defect conditions is needed to improve simulation accuracy.
VIRTUAL AND PHYSICAL PROTOTYPING
(2023)
Article
Polymer Science
Boon Peng Chang, Aleksandr Kashcheev, Andrei Veksha, Grzegorz Lisak, Ronn Goei, Kah Fai Leong, Alfred ling Yoong Tok, Vitali Lipik
Summary: The addition of oxygenated carbon nanotubes significantly improves the physical, mechanical, and dynamic impact properties of EVA foam, without compromising its rebound performance. This study presents promising opportunities for lightweight high-rebound midsoles in running shoes.