Article
Materials Science, Ceramics
Xu Hao, Shiqin Wan, Weiwei Kang, Jialiang Zhao, Sumei Han, Dongyao Peng, Pan Yang, Qi Wang
Summary: Aluminum nitride whiskers were successfully synthesized via carbothermal reduction nitridation method in this study, and the gas-solid growth mechanism of the whiskers was proposed.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Kon-Bae Lee, Jungjoon Kim, Cheol-Hwee Shim, Yanghee Kim, Hyunjoo Choi, Jae-Pyong Ahn
Summary: This study developed a cost-effective method to produce high-purity AlN particles from Al powder at lower temperatures. The nitridation rate was accelerated by using smaller Al particles, and the addition of Ar gas regulated the nitridation rate. The use of a mixture of different Al particle sizes increased the degree of nitridation significantly.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Engineering, Chemical
Youli Xu, Zhiqiang Zhou, Xiumin Chen, Chenchen Han, Bin Yang, Baoqiang Xu, Dachun Liu
Summary: Ultrafine AlN powders were synthesized by carbothermal reduction nitridation method under vacuum, and the optimal synthesis process parameters were determined through experiments. The mechanism of synthesis was revealed through theoretical calculations and experimental analysis.
Article
Materials Science, Ceramics
Da Zhang, Gopalakrishnan Mylsamy, Xixian Yang, Zhipeng Xie, Xiankai Su, Feng Liang, Bin Yang, Yongnian Dai
Summary: The study proposed a method to synthesize high-purity nanostructural aluminium nitride with the assistance of arc discharge and direct nitridation, achieving nanoparticles with high purity, small average particle size, and large specific surface area.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
C. S. Chari, K. T. Faber
Summary: This study investigates the influence of B2O3 on the oxidation of AlN and AlN/BN, as well as the morphological evolution of Al18B4O33, providing insights into the improved oxidation protection provided by liquid B2O3 films on AlN.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Composites
Jungjoon Kim, Jooyoung Park, Cheol-Hwee Shim, Jae-Pyong Ahn, Hyunjoo Choi, Kon-Bae Lee
Summary: The NISFAC process allows for the manufacturing of Al/AlN composites with reduced coefficient of thermal expansion (CTE) by in situ formation of AlN during the reaction between Al powder and nitrogen gas. Increasing the volume fraction of AlN effectively lowers the CTE, achieving values lower than the theoretically expected ones.
JOURNAL OF COMPOSITE MATERIALS
(2022)
Article
Nanoscience & Nanotechnology
Xu Hao, Shiqin Wan, Zheng Zhao, Lifeng Zhu, Dongyao Peng, Ming Yue, Jianlei Kuang, Wenbin Cao, Guanghua Liu, Qi Wang
Summary: With the miniaturization of electronic products, ceramic/polymer composites with excellent thermal conductivity have become increasingly popular. In this study, AlN whiskers were successfully prepared using a modified direct nitriding method and combined with AlN particles to create AlN/epoxy composites. The addition of AlN whiskers formed bridging links between AlN particles, establishing thermal pathways within the polymer matrix. Furthermore, the construction of 3D AlN skeletons through freeze-casting enhanced the thermal conductivity of the composites. The synergistic effect of 1D AlN whiskers and directional filler skeletons on thermal conductivity was demonstrated through experiments and simulations.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Mita Biswas, Siddhartha Bandyopadhyay
Summary: A powder containing a dual phase mixture of 27R-SiAlON and AlN was successfully synthesized through carbothermal reduction and nitridation route. The probable reaction sequences were identified through analysis and FTIR spectra provide supplementary evidence for the revealed model. The particles are agglomerative in nature, consisting of fine grains, and spark plasma sintering was used for an initial densification trial of the bi-phasic powder.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Chenhong Ma, Yong Li, Xiaofang Wu, Yuan Gao
Summary: The in-situ controllable synthesis of AlN-SiC solid solution reinforcement in large-sized Al-Si3N4-Al2O3 composite refractory was achieved through two-steps nitriding sintering. The formation of AlN mesophases occurred through the reaction of solid Al with N-2 and reaction of Al cluster with N-2 and Si3N4. The Si3N4 precursor served as both a solid nitrogen source and an active Si source, leading to uniformly distributed AlN and Si mesophases. The SiC-AlN solid solution was formed when liquid Si appeared, and different morphologies of SiC-AlN solid solution were observed depending on the dynamic AlN mesophase.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Lei Han, Yu Chen, Hong Chang, Faliang Li, Cheng Liu, Tommy Shyng, Yanqiu Zhu, Guangqiang Li, Haijun Zhang, Quanli Jia, Shaowei Zhang
Summary: 3D-NWSNPC has high porosity, low density, low thermal conductivity, high compressive strength, and specific strength. Despite its low density, it shows outstanding performance in compressive strength and specific strength.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Mengyang Niu, Zheng Zhao, Baokai Wang, Chang Yu, Mengyi Li, Jiajun Hu, Ming Yue, Qipeng Lu, Qi Wang
Summary: By rational design of interface engineering and depositing silver nanoparticles on the surface of aluminum nitride whiskers, a composite film with extremely high in-plane thermal conductivity was successfully prepared. The film shows great potential for thermal management applications.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Li Liu, Bingyang He, Xiumin Chen, Zhongqian Zhao, Qi Yin, Peilin Xu, Bin Yang, Baoqiang Xu, Dachun Liu
Summary: The successful synthesis of ultrafine single-phase aluminium nitride particles using the vacuum carbothermal reduction nitridation (VCRN) method at shorter times and lower temperatures is reported. The main reaction path and kinetic mechanism were investigated, showing that the process is controlled by a gas-solid reaction model with different stages. The synthesized AlN particles exhibit high efficiency and can be obtained at lower energy compared to conventional methods.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Engineering, Electrical & Electronic
Yangfeng Li, Xiaotao Hu, Yimeng Song, Zhaole Su, Haiqiang Jia, Wenxin Wang, Yang Jiang, Hong Chen
Summary: This study investigates the influence of temperature on nitridation and AlN buffer layer growth of N-polar GaN grown on sapphire substrate. It is found that medium temperature (1000 ?) leads to improved crystalline quality and optical performance, while high temperature (1110 ?) results in stronger yellow luminescence and weaker near-band-edge emission.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2022)
Article
Chemistry, Physical
Jinhua Ding, Chao Wang, Cheng Lu, Guangming Zhu, Nana Guo, Xujie Gao, Xin Wang, Chunxiang Cui
Summary: The grain size of alloys is crucial in determining their properties, and adding inoculants can significantly decrease the grain size. In this study, an Al3Ti-Al2O3/Al inoculant was successfully prepared using Al-Ti master alloy and Al2O3 whiskers. The Al2O3 whiskers were uniformly dispersed within the inoculants with the aid of ultrasonic energy, and they were broken into small particles at high temperature. Vacuum rapid quenching treatment further improved the morphology of Al3Ti and achieved even particle dispersion throughout the matrix. The Al3Ti-Al2O3/Al inoculants demonstrated excellent grain refinement effects on the weldable Al-Cu-Mn alloy and improved its mechanical properties.
Article
Materials Science, Ceramics
Shiqin Wan, Xu Hao, Chang Yu, Mengyi Li, Zheng Zhao, Lifeng Zhu, Weiwei Xuan, Ming Yue, Wenbin Cao, Qi Wang
Summary: With the increasing integration of electronic devices, the demand for polymer-based composites with higher thermal conductivity as thermal management materials is growing. In this study, high-aspect-ratio AlN whiskers were successfully synthesized and combined with UHMWPE to prepare thermally conductive composites. The introduction and alignment of AlN whiskers resulted in high in-plane thermal conductivity, thermal stability, and mechanical strength.
CERAMICS INTERNATIONAL
(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)