Article
Chemistry, Physical
Tianxu Wang, Zhen Wang, Chenguang Hu, Xinyang Li, Zhulin Huang, Xiaoye Hu, Yue Li
Summary: This study utilized dispersants to effectively reduce the particle size and restrain the agglomeration of HfB2 powder during production, resulting in improved quality of the HfB2 powder.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Ceramics
Eric W. Neuman, William G. Fahrenholtz, Gregory E. Hilmas
Summary: ZrB2 was mixed with 0.5 wt% carbon and up to 10 vol% ZrC and densified by hot-pressing at 2000 degrees C. The resulting dense ceramics exhibited reduced ZrC content and residual carbon, smaller ZrB2 grain sizes, larger ZrC cluster sizes, increased elastic modulus, hardness, toughness, and flexure strength with increasing ZrC content. The strength-limiting flaw was identified as ZrB2 grain pullout.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
K. Jing, R. Liu, Z. M. Xie, J. G. Ke, X. P. Wang, Q. F. Fang, C. S. Liu, H. Wang, G. Li, X. B. Wu
Summary: This study successfully fabricated nanostructured Mo-ZrC alloy with excellent mechanical properties and thermal stability through nanoscale ZrC dispersion and interface control. The alloy exhibited outstanding mechanical properties and thermal stability at both room temperature and high temperatures, with high tensile strength, ductility, and thermal stability. The synergistic effect of nanoscale ZrC particle dispersion strengthening, fine-grain strengthening, and grain boundary purification was revealed by the research results.
Article
Chemistry, Physical
Jun Cheng, Zhijun Dong, Hui Zhu, Guanming Yuan, Aidan Westwood, Ye Cong, Baoliu Li, Jianguang Guo, Xuanke Li
Summary: Ultra-fine Ta4HfC5 and TaHfC2 powders were prepared using a one-pot reaction method, and Ta4HfC5- and TaHfC2-modified C/C composites were prepared through precursor infiltration and pyrolysis. The introduction of TaHfC2 and Ta4HfC5 solid solutions significantly enhanced the anti-ablation performance of the composites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
V. V. Kurbatkina, E. I. Patsera, T. A. Sviridova, E. A. Levashov
Summary: The first part of the study investigates the macrokinetic parameters and phase formation mechanism in the combustion front of Zr-Nb-B mixtures. In the second part, solid solution samples were produced through hot pressing combustion-derived powders. Valuable insights into the behavior of the solid solutions were obtained through the measurement of crystallographic parameters, mechanical and thermophysical properties. This research has significant implications for the development of advanced materials for extreme environments.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Shaoting Lang, Ningbo Sun, Junhui Cao, Weixin Yu, Zhijun Yang, Shusen Hou
Summary: This paper presents a simple method to achieve the ideal microstructural design of particle reinforced tungsten alloys, using W-0.5 wt.% TiC powders prepared with core-shell structure and sintered by spark plasma sintering. The resulting W-0.5 TiC alloys exhibit ultra-fine tungsten grain and high mechanical properties, indicating promising methods for fabricating high-performance tungsten-based alloys with particle dispersion strengthening.
Article
Electrochemistry
Jagadeesh Sure, D. Sri Maha Vishnu, Sunghun Choi, Hyun-Kyung Kim, Carsten Schwandt
Summary: Nano-sized powders of Ta1-xHfxC ceramics were synthesized by electro-deoxidation method at a significantly lower temperature than the conventional preparation methods. The synthesized ceramics exhibited excellent crystal structure and particle size distribution, and had better control over composition.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2022)
Article
Engineering, Chemical
Ann-Christin Boettcher, Dennis Beusen, Arne Lueddecke, Achim Overbeck, Carsten Schilde, Arno Kwade
Summary: This paper discusses the prediction and characterization of breakage in fine grinding processes. It introduces a new breakage tester based on a rigidly-mounted roll mill. The study focuses on the investigation of progressive stress events in fine particle breakage testing, and finds that previous stressing affects the shape of resulting particle size distribution and particle strength.
MINERALS ENGINEERING
(2022)
Article
Materials Science, Ceramics
Gulnar Abdul Karim, Abhijit Ghosh, Rekha Rao, Madangopal Krishnan
Summary: Natural wood is utilized as a template to synthesize porous silicon carbide with a complex cellular structure, which is further processed to obtain nano-sized SiC powder through grinding and milling. A grinding limit is reported for the first time in the SiC system.
ADVANCES IN APPLIED CERAMICS
(2021)
Article
Physics, Multidisciplinary
Shiliang Wang, Liang Ma, James Lee Mead, Shin-Pon Ju, Guodong Li, Han Huang
Summary: This study successfully synthesized [100]-oriented TaC nanowires through carbothermal synthesis, finding that within a certain range of side lengths, their Young's modulus is size-independent, but a size effect is observed when the side length is below 15 nm. The TaC nanowires exhibit brittle fracture behavior during bending tests, with increasing fracture strain as side length decreases. Additionally, MD simulations revealed that defect-free TaC nanowires can theoretically fail brittly at a strain of up to 5.76%.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2021)
Article
Chemistry, Applied
Ziqiao Liu, Zhi Zheng, Guobin Zhu, Shuizhong Luo, Danfeng Zhang, Fengru Liu, Yizhong Shen
Summary: The study showed that planetary ball milling can improve the structure and functional properties of wheat gluten, making it have a looser and more disorderly secondary structure, as well as increased surface hydrophobicity and foaming capacity. Additionally, changes in subunit composition and particle size were observed.
Article
Pharmacology & Pharmacy
Elene De Cleyn, Rene Holm, Tatsiana Khamiakova, Guy Van den Mooter
Summary: This study aimed to enhance the understanding of the intensified vibratory mill by unraveling the milling process in terms of particle size reduction and heat generation. Five process parameters were investigated using an I-optimal design, and a mechanistic model for wet-stirred media milling processes was applied to identify optimization strategies such as adjusting bead size and implementing intermittent pausing for effective cooling. This work provides contour plots and predictive models to forecast particle size and temperature after milling of suspensions manufactured with the intensified vibratory mill.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Materials Science, Multidisciplinary
Xiaozhou Wang, Liyan Zhang, Yifei Wang
Summary: Ultra-high-temperature ceramics have excellent resistance and oxidation at high temperatures, and a HfC-SiC precursor (PHCS) was successfully synthesized in this study. The composition, structure, and properties of the PHCS precursor and its pyrolysis products were analyzed, demonstrating that the PHCS precursor is an ideal raw material for the fabrication of ultra-high-temperature ceramics.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Engineering, Manufacturing
Zhiqiang Liang, Yuchao Du, Yue Ma, Zhipeng Su, Rui Chen, Hao Yuan, Tianfeng Zhou, Xibin Wang
Summary: In this study, the mechanism of milling-grinding combined machining of cemented carbide was analyzed, and a new PCD micro end mill structure was designed. By establishing a mathematical model, the fabrication of a new micro mill with a certain helix flute width was realized. The experimental results showed that the new micro mill had improved surface quality and wear resistance, making it suitable for high-quality and high-efficiency machining.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Engineering, Chemical
Deyu Jiang, Lizhen Deng, Taotao Dai, Ruihong Liang, Wei Liu, Chengmei Liu, Changhong Li, Junzhen Zhong, Hongwen Zhong, Jun Chen
Summary: This study investigated the changes in particle characteristics, nutrient composition, and volatile components during the grinding process of matcha at various time intervals (20-140 min). The results showed that grinding time significantly affected the particle size, color, and aroma of the matcha powder. It also preserved the active polyphenols and amino acids and facilitated the formation of characteristic flavor substances. These findings suggest that the use of stirred media mills has potential for producing high-quality matcha.
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)