Article
Materials Science, Multidisciplinary
Tao Lin, Qianghua Li, Yu Han, Ke Song, Xueting Wang, Huiping Shao, Jianhui Dong, Hao Wang, Xin Deng
Summary: Cemented carbides (WC-Co-Ni) with the addition of Nb and NbC were prepared by powder metallurgy method. The microstructure and mechanical properties were analyzed. The results showed that the addition of Nb or NbC can reduce the grain size of WC. Nb has a stronger inhibitory effect on WC grain growth than NbC. The transverse fracture strength of the samples first increased and then decreased with the increase of Nb and NbC contents. The hardness of cemented carbides increased with the content of additives. The fracture toughness and impact toughness decreased with the increase of NbC and Nb contents.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Coatings & Films
Larissa Rossi Gehlen, Giovanni Bolelli, Pietro Puddu, Enrico Forlin, Alberto Colella, Giuseppe Pintaude, Luca Lusvarghi
Summary: The potential of NbC-based coatings was investigated, and they were found to have low porosity, high hardness, good sliding wear resistance, and excellent corrosion resistance, especially at 400 degrees C.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Abbas Moghim, Maisam Jalaly, Sadegh Sadeghzadeh
Summary: In the first stage of this work, a master nanocomposite of niobium carbide (NbC)-Cu was synthesized using a mechanically induced magnesiothermic combustion method. In the second stage, the NbC-Cu nanocomposite powder was mixed with pure copper powder to prepare Cu-based nanocomposite with different volume fractions of NbC. The final nanocomposite powder was sintered using spark plasma sintering method. The density of the nanocomposite specimens decreased with increasing NbC content, while the microhardness increased.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Chemistry, Physical
S. G. Huang, J. Vleugels, B. Tunca Altintas, J. H. Huang, B. Lauwers, J. Qian
Summary: The study investigated the influence of WC and Ti(C0.7N0.3) content on the microstructure and mechanical properties of NbC solution matrix cermets. Results showed that the variation in WC and Ti(C0.7N0.3) content significantly affected the phase composition, in-situ formed (Nb,W,Ti,Mo)(C,N) solution grain growth, and mechanical properties.れ
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Ceramics
Arseniy Bokov, Anna Shelyug, Alexey Kurlov
Summary: The study demonstrates successful sintering of TaC and NbC ceramics with high densities, showcasing hardness of 20-25 GPa through reduction in carbon stoichiometry and submicron grain sizes. XRD, SEM, and TGA-DSC were employed to investigate the phenomena during processing, revealing the presence of oxygen impurities in carbide particles and decarburization and oxide segregation during sintering. The effects of decarburization and oxide segregation can be counteracted by carbon excess, but controlling the densification curve can be challenging in such cases.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Physical
Adrian Grabos, Jan Huebner, Pawel Rutkowski, Shenghua Zhang, Yen-Ling Kuo, Dariusz Kata, Shigenari Hayashi
Summary: The study successfully obtained Inconel 625-NbC composites utilizing Spark Plasma Sintering, with improved hardness proportional to NbC addition. Interaction between reinforcement and alloy during heat treatment was crucial for obtaining high-quality composites with homogenous hardness improvement.
Article
Materials Science, Multidisciplinary
Luara da Costa Morais, Flavio Beneduce, Rodrigo Magnabosco, Andre Luiz Nunis da Silva
Summary: This study investigated the influence of adding TiC on the growth of carbide particles in NbC-Ni cemented carbides. The addition of TiC resulted in a decrease in NbC grain size, change in carbide morphology, and a retardation in carbide dissolution. A thin Ti rich layer was found to form at the carbide/binder interface, promoting both hardness and toughness values.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Ramazan Sobhanverdi, Alireza Akbari
Summary: In-situ Cu/NbC, Cu/NbC-WxC, and Cu/WxC nanocomposites were fabricated through mechanical alloying and then consolidated through Equal Channel Angular Pressing. The microstructure, phase constituent, and hardness of the powders were investigated. The results showed that the Cu matrix size and carbide particle size were refined, and WC and W2C phases were formed during consolidation. Cu5Nb5W exhibited the highest hardness due to its smaller Cu matrix size and finer carbide particles, indicating the successful synthesis of tailored Cu-based nanocomposites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Luara da Costa Morais, Flavio Beneduce, Rodrigo Magnabosco, Tiago Ramos Ribeiro
Summary: Through DICTRA (R) simulation, the growth of carbide particles in a NbC-12%Ni sample was studied, revealing that small carbides dissolve completely while larger carbides do not. Additionally, Nb and C from carbide dissolution segregate to the liquid phase, indicating the potential for re-precipitation in non-dissolved carbides during cooling.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Metallurgy & Metallurgical Engineering
Bruno Edu Arendarchuck, Luciano Augusto Lourencato, Hipolito Domingo Carvajal Fals, Andre Renan Mayer, Carlos Roberto Camello Lima
Summary: This study evaluates the abrasive wear resistance of A380 aluminum alloy reinforced with different amounts of NbC reinforcement. The results show that the wear resistance and hardness of the composite material increase to varying degrees with the increase of NbC content.
INTERNATIONAL JOURNAL OF METALCASTING
(2023)
Article
Chemistry, Physical
Saeedeh Sarabadani Tafreshi, Mahkameh Ranjbar, Narges Taghizade, S. F. K. S. Panahi, Maryam Jamaati, Nora H. Leeuw
Summary: This study investigates the reaction mechanism of CO2 hydrogenation to useful products on the Nb-terminated NbC (111) surface using density functional theory calculations. The results reveal that the formation of CH4, CH3OH, and CO is favored, with CH4 being the dominant product.
Article
Materials Science, Multidisciplinary
J. H. Huang, S. G. Huang, P. Zhou, B. Lauwers, J. Qian, J. Vleugels
Summary: The influence of up to 15 vol% WC or Mo2C addition on Ni bonded NbC matrix cermets was assessed in this study. Thermodynamic modelling, microstructure and phase analysis were used to study the constituent phases and dissolution of W/Mo in the binder and NbC phases. The study discussed the phase evolution, solid solution formation, and evaluated fracture toughness, Vickers hardness, and transverse rupture strength.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Chemistry, Physical
Wenshuo Ding, Le Sun, Zongqing Jia, Shanshan Jin, Ziting Wang, Wenda Zhong
Summary: Surface adsorption behavior and electron transfer in NbC are optimized by doping Cu+ and modifying orbital hybridizations, resulting in a thinner surface oxidation layer and improved electron transfer efficiency. Moreover, the electron orbital hybridization modulates the electron states and enhances the hydrogen adsorption behavior, leading to higher hydrogen conversion efficiency. The Cu-NbC catalyst exhibits significantly higher catalytic activity for the hydrogen evolution reaction compared to NbC.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Saravanan Meghanathan, Raj Mohan Radhakrishnan, Venkatraman Ramamoorthi, Raghuraman Srinivasan
Summary: The study aimed to evaluate the machinability of the composite material (AlSi10Mg + Niobium carbide (NbC)) using the Electro-discharge machining (EDM) process and to investigate the influence of different printing orientations on the EDM process.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART L-JOURNAL OF MATERIALS-DESIGN AND APPLICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Jingjing Liu, Xinzhong Li, Xiao Liang, Hengzhi Fu, Jingjie Guo, Dongmei Liu
Summary: Niobium carbide (NbC) catalytic films were deposited on the surface of vanadium (V) substrates for hydrogen separation and purification. The addition of CH4 gas changed the structure of NbC film and increased the carbon content but decreased the crystallinity. The NbC/V composite membrane showed the highest hydrogen permeation performance at an F-CH4 of 5%.
MATERIALS CHEMISTRY AND PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
S. G. Huang, C. Liu, B. L. Liu, J. Vleugels, J. H. Huang, B. Lauwers, J. Qian, H. Mohrbacher
Summary: The microstructure, phase constitution, and mechanical properties of Ni bonded (Nb,W,Ti)(C,N) solution cermets were studied, with simulations of phase composition in the sintered cermets. The sintered cermets exhibited a microstructure of Ni alloy binder dispersed in (Nb,W, Ti)(C,N) solid solution grains with core-rim structure.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Diego Tolotti de Almeida, Kleber Eduardo Bianchi, Joao Henrique Correa de Souza, Milton Sergio Fernandes de Lima, Thomas Gabriel Rosauro Clarke, Fabio Pinto da Silva, Hardy Mohrbacher
Summary: This study investigates and compares the fatigue performance of laser-welded joints of two press hardening steels: a standard 22MnB5 and a variant modified by NbMo alloying. The results indicate that joint geometry aspects and intrusion-generated damage mechanism are the main causes of poor fatigue life. The NbMo modified alloy performs better than the standard steel. Laser-welded joints of press hardened steels could offer favorable fatigue performance if tight quality limits are used in the manufacturing procedures, surpassing that of conventional and high strength structural steels.
Article
Materials Science, Multidisciplinary
Johannes Webel, Hardy Mohrbacher, Eric Detemple, Dominik Britz, Frank Mucklich
Summary: The solubility of mixed niobium-titanium carbonitrides in commercially relevant HSLA steel was investigated using electrical resistivity measurements and APT analysis. The study found that the solubility was influenced by the niobium addition and soaking temperature, and the APT analysis agreed well with the electrical resistivity measurements. The influence of insoluble titanium nitrides on microalloy elements was corrected using quantitative image analysis and APT analysis. The experimental solubility of the mixed carbonitrides was found to significantly differ from the solubility of well-established simple carbides and nitrides. Therefore, a robust methodology for quantifying microalloy precipitation in HSLA steels is crucial.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Zahid Anwer, Jozef Vleugels, Amit Datye, Shuhan Zhang, Shuigen Huang
Summary: The influence of varying carbon content on the microstructure and mechanical properties in the (V, Nb,Ta,Ti,W)C -12 vol% Ni system was investigated. The results revealed the impact of carbon content on eutectic temperature, carbide grain size and morphology, phase stability, and mechanical properties in high entropy carbide (V,Nb,Ta,Ti,W)C-Ni cermets. Additionally, the phase stability and chemical reactivity with steel of the High Entropy Carbide (HEC) cermets were assessed and compared to conventional WC-Co cemented carbides at 1200 degrees C.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Ahmed Selema, Margherita Beretta, Matty Van Coppenolle, Hans Tiismus, Ants Kallaste, Mohamed N. Ibrahim, Marleen Rombouts, Jozef Vleugels, Leo A. I. Kestens, Peter Sergeant
Summary: Nowadays, surpassing conventional 2D laminated structures is crucial for enhancing the functionality of electrical machines in the design process. Additive manufacturing (AM) provides unparalleled 3D freedom for processing metal-based materials, optimizing weight and cost effectiveness. This study focuses on 3D printing and testing of ferromagnetic material. Different parts are built using silicon steel (Fe-3wt%Si) powder through various AM techniques, and their magnetic properties are measured and compared. The results demonstrate the potential of AM technology in manufacturing magnetic materials, as well as the good magnetic properties achieved from the 3D printed samples. The study also highlights the possibilities of 3D multi-material printing for electrical machines.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Physical
Jide Han, Berfu Goksel, Shiva Mohajernia, Manuela Sonja Killian, Jozef Vleugels, Annabel Braem, Sylvie Castagne
Summary: Zirconia toughened alumina (ZTA) is commonly used in hip joint implants and cutting tools due to its unique properties. The difference in material properties between zirconia and alumina phases leads to the selectivity of phase melting and the disintegration of alumina grains during laser processing. This selective phase melting phenomenon makes the material removal mechanism of the nanocomposite significantly different from that of single-phase materials.
APPLIED SURFACE SCIENCE
(2023)
Article
Construction & Building Technology
Nicole Dilissen, Jef Vleugels, Jules Vermeiren, Beatriz Garcia-Banos, Juan Rafael Sanchez Marin, Jose M. Catala-Civera
Summary: This study focuses on the microwave (MW) dehydration and clinkering of hydrated cement paste, specifically investigating the MW-material interaction during heating to 1100 degrees C. The dielectric properties of various cement components were measured, and their changes were correlated to phase changes detected through different analysis methods. The research shows that ordinary Portland Cement (OPC) can be effectively MW heated, and the dielectric properties of hydrated cement contribute to its efficient heating process. The recovery of clinker phases demonstrates the potential for cement retrieval from hydrates.
CEMENT AND CONCRETE RESEARCH
(2023)
Article
Dentistry, Oral Surgery & Medicine
Masanao Inokoshi, Hengyi Liu, Kumiko Yoshihara, Mao Yamamoto, Watcharapong Tonprasong, Yasuhiko Benino, Shunsuke Minakuchi, Jef Vleugels, Bart Van Meerbeek, Fei Zhang
Summary: This study investigated crystallography, translucency, phase content, microstructure and flexural strength of two commercial strength-gradient multilayered dental zirconia grades. The results showed that the 'enamel' layer contains a higher amount of c-ZrO2, resulting in higher translucency but lower flexural strength. The strength-gradient approach allowed for integration of monoliths with irreconcilable properties.
Article
Materials Science, Multidisciplinary
Gamze Colak, Gregory Leinders, Jef Vleugels, Remi Delville, Marc Verwerft
Summary: A hybrid route combining internal gelation and a single-step infiltration was investigated to prepare U1-yNdyO2-x sintered microspheres as a surrogate for U1-yAmyO2-x transmutation targets. The use of starch as a pore-forming agent in the internal gelation process for fabricating porous uranium oxide microspheres has been studied in detail. High accessible porosity levels were measured after calcination, allowing efficient infiltration behavior and achieving high average dopant levels up to y = 30 mol% after sintering.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Materials Science, Ceramics
Jinhua Huang, Shuigen Huang, Jef Vleugels
Summary: By using thermodynamic simulation, NbC-Ni based cermets with different W and C additions were designed and sintered in liquid state, resulting in varied phase constitution, microstructure, and mechanical properties. Microscopic analysis revealed the presence of cubic (Nb,W)C solid solution, Ni alloy binder, and carbon-deficient phase in the cermets. Additionally, mechanical properties such as hardness, toughness, and strength were found to be influenced by the phases and NbC grain size.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
Maoyin Li, Bensu Tunca, Bart Van Meerbeek, Jef Vleugels, Fei Zhang
Summary: This study proposes a simpler and more controllable method to improve the mechanical properties of conventional ceria-stabilized tetragonal zirconia (Ce-TZP) by doping aliovalent oxides that can segregate at the zirconia-grain boundaries. It is found that doping with calcium and magnesium can change the microstructure and transformation behavior of the material, enabling ceramic materials to undergo inelastic deformation to a certain extent, thereby achieving the optimal combination of toughness, biaxial strength, and damage tolerance.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Hardy Mohrbacher, Linda Bacchi, Gloria Ischia, Stefano Gialanella, Michele Tedesco, Fabio D'Aiuto, Renzo Valentini
Summary: Press hardening steel commonly uses titanium microalloying to protect boron from nitrogen, ensuring the hardenability effect during die quenching. Additional microalloying elements, such as niobium and vanadium, have been found to improve toughness, bendability, and hydrogen embrittlement resistance. A new press hardening steel incorporates all three microalloying elements and shows enhanced performance compared to standard grade steel.
Article
Materials Science, Multidisciplinary
J. H. Huang, S. G. Huang, J. Vleugels
Summary: Binderless NbC with 0-25 wt% WC powder mixtures were pressureless sintered in vacuum at different temperatures to generate open porosity (Nb,W)C skeletons. The formation of residual minor amounts of W2C and WC was discussed and compared with thermodynamic predictions. The microstructure of the as-sintered homogeneous (Nb,W)C grains in the skeleton changed after Cu infiltration due to the partial dissolution of Nb. The properties of the as-sintered porous and Cu-infiltrated materials were evaluated and discussed.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
D. Lunt, R. Thomas, D. Bowden, M. T. P. Rigby-Bell, S. de Morae Shubeita, C. Andrews, T. Lapauw, J. Vleugels, J. Quinta da Fonseca, K. Lambrinou, P. Frankel
Summary: This work proposes a novel approach to detect strain localisation caused by irradiation-induced damage in nuclear materials on the microstructural level. High-resolution digital image correlation (HRDIC) is used to determine local strains and generate high-resolution strain maps, which can help understand the effects of irradiation-induced dimensional change and cracking. The combination of scanning electron microscopy (SEM) and HRDIC is demonstrated to measure irradiation-induced dimensional changes in three different materials and is crucial in designing microstructures that are structurally resilient during irradiation.
JOURNAL OF NUCLEAR MATERIALS
(2023)
Article
Optics
Jide Han, Jozef Vleugels, Annabel Braem, Sylvie Castagne
Summary: Inspired by the applications of metal-dielectric nanocomposite materials, the study investigated the ultrashort single pulse laser irradiation of zirconia-alumina nanocomposite with band gap contrast. It was observed that the higher melting point zirconia phase melted while the lower melting point alumina phase remained intact, suggesting a significant temperature heterogeneity in the composite. Theoretical modeling revealed that the material band gap plays a significant role in laser energy absorption, resulting in a remarkable temperature difference between the two phases.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ziyan Zhao, Kaiyue Zheng, Xianghui Yu, Qian Qi, Lujie Wang, Yan Liu
Summary: In-situ TiC/Ni composites with Ta element were fabricated by reactive sintering. It was found that Ta element could reduce the oxidation rate and decrease the content of TiO2 and NiTiO3 in the oxide scale, thereby optimizing the oxidation resistance and electrical conductivity of the composites.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Kai Wang, Mingyuan Ma, Yingchun Diao, Qijun Huang, Xiangkui Zhou, Guojian Li, Qiang Wang
Summary: The relationship between the V(C, N) content and the thickness of the gradient layer in nanocrystalline cemented carbides was investigated. The introduction of V(C, N) was found to enhance the mechanical properties of these materials.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Claudio Bertalan, Steven Moseley, Leonel Pereira, Ralph Useldinger
Summary: The influence of sintering temperature, dwelling time at maximum temperature and carbon content on the microstructure and mechanical and magnetic properties of WC-6%Co hardmetal was investigated. Results showed that to maximize hardness and transverse rupture strength (TRS), sintering should be performed at a low temperature (< 1400°C) and with a dwelling time of at least 75 minutes. This is particularly important for low carbon parts to ensure the necessary microstructure homogeneity required for high TRS.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Longlong Sun, Hang Li, Ningxin Wei, Jianliang Li, Jiewen Huang, Jian Kong, Qiujie Wu, Yan Shi, Dangsheng Xiong
Summary: By regulating the microstructure of TaBx films deposited by magnetron sputtering, the hardness and wear resistance of the films can be improved. With the increase of the bias voltage, the B content decreases and the crystallinity is enhanced. The microstructure of the films transforms from fibrous to dense columnar and then to granular structure. At a bias voltage of -180 V, the films exhibit super high hardness and relatively moderate fracture toughness.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Liang Xia, Kai Liu, Yucheng Cao, Chao Jiang
Summary: This study investigates the microstructure information and mechanical behavior of ion-irradiated zirconium alloys through experimental measurements and theoretical analysis. Experimental procedures involve Au3+ irradiation of specific alloys, and transmission electron microscopy analysis reveals the formation of precipitates and their transformation after ion-irradiation. Macroscopic mechanical properties are characterized by nano-indentation tests, revealing significant indentation size effect and irradiation hardening behavior. A mechanistic model is developed to explain the depth-dependent hardness observed in ion-irradiated zirconium alloys.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Jiangtao Zhang, Guoqin Huang, Yangli Xu, Jianyu Wang, Guangyao Han, Yuanqiang Tan
Summary: Selective laser melting (SLM) provides a novel method for the integrated production of structural and functional metal-matrix diamond composites in the field of diamond tools. In this study, a discrete element method model is developed to simulate the spreading process of diamond/CuSn composite powders. The findings reveal that adjusting the physical properties of diamond particles and process parameters can improve the powder bed quality and particle dynamics, leading to better performance of diamond tools.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Roman Gabor, Ladislav Cvrcek, Karel Masek, Josef Hlinka, Oldrich Motyka, Jan Walter, Grazyna Simha Martynkova, Gabriela Mikeskova, Jana Seidlerova
Summary: This study investigated the surface modification of β-Ti39Nb alloy using micro-arc oxidation technique, and examined the relationships between surface chemical composition, morphology, and tribological and corrosion properties. The results showed that the technique improved the wear resistance of the alloy, and the particle analysis confirmed the correlation between particle composition and tribological parameters.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Benedetto Bozzini, Matteo Amati, Luca Gregoratti, Majid Kazemian, Francesco Tavola, Sandra Tedeschi, Gian Pietro De Gaudenzi
Summary: In this study, the composition and chemical state of the surface of hardmetal subjected to controlled electrochemical corrosion were analyzed using synchrotron-based scanning photoelectron microscopy and photoelectron microspectroscopy. The results showed that corrosion under different conditions led to surface enrichment and leaching of different chemical elements and species.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
B. Roebuck, M. G. Gee, K. P. Mingard, H. G. Jones, H. Zhang, V. Tong
Summary: Metrology provides scientific support for the practical use of testing standards and helps establish a common language for different users regarding material capabilities. The hardmetal industry already has numerous international standards, but there is still room for improvement in certain testing strategies. The Materials Group at the National Physical Laboratory in the UK focuses on metrology and has highlighted specific metrological issues that need further attention. These include high hardness measurements, dislocation analysis, micro-tribology, nanoindentation, and structural characterization.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Suyeon Kim, Taehyun Kwon, Seulgi Kim, Sung Ho Song, Dongju Lee
Summary: This study examines the effect of two different methods, oxide reduction and mechanical alloying, on the sintering behavior and microstructure of molybdenum-tungsten sintered compacts. The sintered compacts produced with oxide-reduced nanopowders exhibit higher density, purity, and a finer microstructure, making them more suitable for sputtering targets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
A. M. Ferro Rocha, A. M. Santos, R. Mineiro, P. Pereira, J. Sacramento, A. M. R. Senos, A. C. Bastos
Summary: This study compares the corrosion resistance of different hardmetal composites and their binders in a corrosive environment. Through electrochemical testing methods, the corrosion behavior of these materials was studied, and the influence of the binder's electrochemical behavior on the corrosion resistance of hardmetal was explored.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bo Li, Yong Zheng, Wangwang Wang, Hao Wu, Yufan Li, Jin Lv
Summary: The effects of various Cr doping amounts on the microstructure and properties of Mo2FeB2-based cermets were investigated using EDS, SEM, and TEM. The results showed that moderate Cr doping enhanced the system's wettability, fracture toughness, and transverse rupture strength, while excessive Cr addition decreased mechanical properties. The solid-solution of Cr in the hard phase had the most pronounced effect on the mechanical properties of the cermets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Min Lian, Fei Wang, Kaixuan Rong, Xiaoci Ma, Hetian Liu, Xinmiao Gai, Yufei Ge, Shushan Dong, Qiang Tao, Pinwen Zhu
Summary: This study successfully optimized the toughness of polycrystalline diamond (PCD) by adjusting the intergranular fracture (IF) and transgranular fracture (TF) modes. The results showed that a mixture of the IF and TF modes resulted in higher hardness and toughness in PCD compared to a single fracture mode. The toughness of the PCD was approximately three times that of single-crystal diamonds and comparable to that of pure nanotwinned diamonds. The mixed modes introduced toughening mechanisms such as high frequency large crack deflection, crack bridging, pull-out, and crack branching, which increased the toughness of the PCD.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ruifang Wang, Xiang Zhan, Yongqiang Chen, Chao Zhang, Yusi Che, Jilin He
Summary: The particle size and morphology of tungsten powders play a crucial role in determining the processing properties of tungsten products. This study investigated the effects of water vapor partial pressure on the hydrogen reduction of tungsten oxides, and proposed a method of changing the particle size of tungsten powders using bottom blowing hydrogen. The experimental results showed that bottom-blowing hydrogen could improve the uniformity of tungsten powders in a crucible by eliminating discrepancies in water vapor partial pressure. The partial pressure of water vapor increased with the temperature of the water bath, leading to an increase in the average particle size of tungsten powders.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oladapo Eso, Xu Wang, Samuel Wolf, Travis Puzz
Summary: In recent decades, there has been an increasing trend in incorporating alloying additives into WC-Co hardmetals for property enhancement. This paper establishes correlations between properties and microstructure of binder modified WC-Co compositions, and explains the observed property correlations.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
