Article
Materials Science, Ceramics
Leyla Yanmaz, Filiz Cinar Sahin
Summary: Square-shaped monolithic B4C and B4C-ZrB2 composites were produced using SPS method. The addition of 5, 10, 15 vol% ZrB2 had an effect on the densification, mechanical and microstructural properties of boron carbide. The density of B4C increased with increasing volume fraction of ZrB2 and the density differences in different regions of the sample decreased. The addition of ZrB2 enhanced the hardness and fracture toughness of the composites compared to monolithic B4C. The B4C-15 vol% ZrB2 composite exhibited superior properties with a hardness of 33.08 GPa and Vickers indentation fracture toughness of 3.82 MPa·m1/2.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Ceramics
H. Unsal, S. Grasso, A. Kovalcikova, O. Hanzel, M. Tatarkova, I Dlouhy, P. Tatarko
Summary: Homogenous, fully dense samples free of graphene were obtained by using insulating Al2O3 paper during reactive SPS. Isolated SPS had the main advantages of short dwell time (30 s after a degassing step of 6 min) and uniform distribution of fine TiB2 grains over the reactive hot press and SPS processes, respectively.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Lanqing Liang, Boxin Wei, Dong Wang, Wenbin Fang, Lei Chen, Yujin Wang
Summary: Dense (Zr, Ti) (C, N) ceramics with improved mechanical properties were fabricated by spark plasma sintering using ZrC, TiCN, and ZrH2 powders.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Iwona Sulima, Pawel Hyjek, Marcin Podsiadlo, Sonia Boczkal
Summary: This study presents the effect of zirconium diboride (ZrB2) and titanium diboride (TiB2) on the microstructure and physical, mechanical, and tribological properties of composites based on 316 L steel. The amount of each reinforcing phase added to the base alloy was 5 wt% and 10 wt%. The composites were fabricated using the SPS process. The results demonstrate that the weight fraction of the reinforcing phase influences the physical, mechanical, and tribological properties of the sintered composites. The addition of TiB2 effectively increases the hardness and compressive strength of the composites, while introducing ZrB2 improves the wear resistance of the composites.
Article
Materials Science, Ceramics
Mingcheng Zhu, Lan Zhang, Na Li, Desen Cheng, Jidong Zhang, Shiyao Yu, Hui Bai, Huizhong Ma
Summary: In this study, ternary ZrB2-SiC-MoSi2 composites with different compositions were successfully fabricated by reactive spark plasma sintering. The densification behavior, microstructures, and mechanical properties were investigated. It was found that the addition of MoSi2 could improve the relative density, hardness, and fracture toughness of the composites, and a core-shell structure could be formed to enhance the overall performance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Ceramics
Zhiju Zhao, Chenglin Wang, Liqin Yang, Yanping Cheng, Zhenyu Cai, M. Zarezadeh Mehrizi
Summary: In this study, a NiAl/TiC0.95 composite was synthesized through reactive spark plasma sintering of mechanically activated elemental powders. The microstructure and properties of the activated powders and sintered samples were evaluated. The results showed that after 10 hours of mechanical activation, Ni3Al and Ni2Al3 were eliminated from the sintered powder, leaving only NiAl and TiC0.95.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Zohre Ahmadi, Mehdi Shahedi Asl, Mohammad Zakeri, Mohammad Farvizi
Summary: In this study, the influence of TiN addition on ZrB2-SiC composite was investigated. The addition of TiN increased the porosity content, resulting in a decrease in flexural strength but an increase in indentation fracture toughness and Vickers hardness.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Ceramics
Chenjun Tang, Zheyu Fang, Dong Wang, Xing Jin, Songlin Ran
Summary: The sintering method greatly affects the sintering behavior, microstructure, and properties of TiB2-h-BN composites. TiB2-h-BN composites prepared by reactive spark plasma sintering (RSPS) exhibit better mechanical performance with higher sintering activity and finer microstructure compared to those prepared by conventional spark plasma sintering (CSPS). The in-situ reactive sintering method has obvious advantages in preparing TiB2-h-BN composites with excellent mechanical properties at low temperature.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
F. Giovannelli, E. Sabarthes, F. Delorme
Summary: In this study, spark plasma sintering was used to prepare dense ceramics of La7Mo7O30 from La2Mo2O9 powder and investigate their thermoelectric properties. The experimental results show that La2Mo2O9 was reduced to La7Mo7O30 during the SPS process. The obtained La7Mo7O30 ceramic exhibits semiconducting behavior with a high electrical conductivity at 1000 K and a very low thermal conductivity throughout the temperature range from room temperature to 1000 K. The figure of merit reached 0.04 at 1000 K.
CERAMICS INTERNATIONAL
(2023)
Article
Materials Science, Ceramics
Behzad Nayebi, Mehdi Shahedi Asl, Maryam Akhlaghi, Zohre Ahmadi, Seyed Ali Tayebifard, Esmaeil Salahi, Mohammadreza Shokouhimehr, Mohsen Mohammadi
Summary: The TiB2-Ti3AlC2 ceramic was successfully manufactured using spark plasma sintering, with Ti3AlC2 additive decomposing at the initial stages of sintering. The final ceramic exhibited a near full density of around 99% and a hardness of approximately 28 GPa, with densification mechanism and sintering phenomena discussed and graphically illustrated.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Sijia Huo, Yujin Wang, Mianyi Yao, Zhikun Zhang, Lei Chen, Hui Gu, Jiahu Ouyang, Yu Zhou
Summary: Novel TiC-based composites were synthesized with ZrB2 addition as a sintering aid, exhibiting excellent mechanical properties surpassing most TiC-based composites using ceramics as sintering aids. The addition of ZrB2 led to enhanced hardness, flexural strength, and fracture toughness of the materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Ipek Akin, Burak Cagri Ocak, Melis Kaplan Akarsu, Onuralp Yucel, Filiz Sahin, Gultekin Goller
Summary: The study investigated the effect of GNP concentration on the mechanical properties of spark plasma sintered TiB2 and NbB2 ceramics, finding that GNPs enhance densification while also affecting microhardness. NbB2-GNP composites exhibited higher fracture toughness and better oxidation resistance compared to TiB2-GNP composites.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2022)
Article
Chemistry, Physical
Iwona Sulima, Pawel Hyjek, Marcin Podsiadlo
Summary: This study aimed to consolidate zirconium diboride-reinforced composites using the SPS technique, investigating the effects of different powder mixture preparation methods, reinforcing phase content, and sintering temperature on the properties of the composites. It was found that milling in a planetary mill improved the dispersion of ZrB2 particles in the steel matrix, while higher ZrB2 content resulted in enhanced hardness and wear resistance of the composites.
Article
Materials Science, Ceramics
Eric W. Neuman, Matthew J. Thompson, William G. Fahrenholtz, Gregory E. Hilmas
Summary: The heating rate significantly influences the microstructure and properties of zirconium diboride ceramics, with slower rates resulting in larger grains and retained ZrO2 particles, while faster rates leading to rapid densification but also microcracks.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Physical
Pavel Nikitin, Ilya Zhukov, Aleksey Matveev, Sergei Sokolov, Mikhail Grigoriev, Alexander Vorozhtsov
Summary: The AlMgB14-TiB2 composite materials were synthesized by SHS and spark plasma sintering. The formation of AlMgB14 phase during SHS is related to the mass ratio of donor (Ti + 2B) to acceptor (Al12Mg17-B), with 3:7 and 4:6 being the optimal ratios. The specimen sintered at 1470 degrees C with a 5:5 mass ratio has a uniform structure and achieves an average hardness of 30.1 GPa.
Article
Chemistry, Multidisciplinary
Keke Gao, Rui Xu, Yunxiang Chen, Zongtao Zhang, Jiashuo Shao, Haipeng Ji, Liying Zhang, Shasha Yi, Deliang Chen, Junhua Hu, Yanfeng Gao
Summary: The paper presents a strategy to enhance the electrochemical properties of lithium-sulfur batteries by using TiO2-carbon nanocomposites embedded hierarchical porous carbon interlayers. The interlayers effectively immobilize polysulfides and improve the redox reaction kinetics, resulting in improved battery performance.
CHINESE CHEMICAL LETTERS
(2023)
Article
Biochemistry & Molecular Biology
Yue-Ju Yang, Shi-Xiong Li, De-Liang Chen, Zheng-Wen Long
Summary: This theoretical research investigates the structural evolution, electronic properties, and photoelectron spectra of selenium-doped boron clusters SeBn0/- (n = 3-16) using particle swarm optimization (CALYPSO) software and density functional theory calculations. The results show that the lowest energy structures of SeBn0/- (n = 3-16) clusters tend to be quasi-planar or planar. The addition of a Se atom modifies and improves some of the pure boron cluster structures. The research enriches the geometrical structures of small doped boron clusters and provides insights for boron-based nanomaterials.
Article
Environmental Sciences
Lu Wang, Hongyan Liu, Jussi Griessinger, Deliang Chen, Changfeng Sun, Congxi Fang
Summary: This study reconstructed the summer soil moisture changes in the southeastern Tibetan Plateau from 1691 to 2007 using tree-ring delta O-18 as a paleoclimate proxy. The results showed an abrupt wet-to-dry change in 1884, followed by a decreasing trend and increased variability in soil moisture. The variability reached an unprecedented level after the 1950s. The study indicates that precipitation, rather than temperature, is the main controlling factor for soil moisture variation.
WATER RESOURCES RESEARCH
(2023)
Article
Forestry
Cong Gao, Chunming Shi, Yuxin Lou, Ran An, Cheng Sun, Guocan Wu, Yuandong Zhang, Miaogen Shen, Deliang Chen
Summary: To reconstruct the past Arctic temperature variations, the authors screened 1116 tree-ring width and density records and applied four detrending functions. They selected 338-396 records that showed significant correlations with instrumental temperature data and combined them into a proxy record. The reconstruction explained 45-57% of the instrumental temperature variance since 1950, and the estimated Arctic warming amplitudes were consistent with temperature anomaly datasets.
Article
Environmental Sciences
Ruzhen Yao, Shenghai Li, Deliang Chen
Summary: The Tibetan Plateau has undergone significant warming in recent decades, leading to glacier melt and impacts on river runoff. This study used glacier mass balance measurements and hydrological modeling to analyze the contributions of two glacierized basins to river runoff and investigate their responses to climate changes. The results highlight the dominant role of precipitation changes in these basins, which have small glacier meltwater contributions.
Article
Water Resources
Huiru Jiang, Yonghong Yi, Jijun Xu, Deliang Chen, Fan Lu, Rongxing Li, Xuejia Wang, Binrong Zhou
Summary: This study evaluates the performance of nine precipitation products in the source region of the Yangtze River. The majority of products are able to replicate the observed decreasing trend of precipitation below 4500 meters, but trends vary at higher elevations. The results indicate that gauge-based precipitation products with bias correction perform best, while most satellite-based products underestimate precipitation.
JOURNAL OF HYDROLOGY-REGIONAL STUDIES
(2023)
Article
Geosciences, Multidisciplinary
Wenting Wang, Shuiqing Yin, Zeng He, Deliang Chen, Hao Wang, Andreas Klik
Summary: This study improves the accuracy of future rainfall erosivity projections in China by selecting five CMIP6-based and bias-adjusted Global Climate Models (GCMs). The results show that GFDL-ESM4, IPSL-CM6A-LR, and UKESM1-0LL models outperform others in estimating rainfall erosivity, especially in regions prone to water erosion. The study projects an increase in rainfall erosivity for most regions in China, indicating the need for enhanced soil and water conservation measures to mitigate the challenges posed by global warming.
Article
Environmental Sciences
Yanxin Zhu, Yan-Fang Sang, Bin Wang, Arthur Lutz, Shi Hu, Deliang Chen, Vijay P. Singh
Summary: This study investigates the spatial heterogeneity of runoff variability in High Mountain Asia (HMA) and the roles of climate conditions and catchment properties. Results show significant variability of runoff at different timescales, with climate variations and catchment properties playing important roles. These findings have critical implications for sustainable freshwater management and risk mitigation in HMA.
WATER RESOURCES RESEARCH
(2023)
Article
Meteorology & Atmospheric Sciences
Sifan Wang, Bin He, Hans W. Chen, Deliang Chen, Yaning Chen, Wenping Yuan, Feng Shi, Jianping Duan, Wei Wu, Tiexi Chen, Lanlan Guo, Ziqian Zhong, Weili Duan, Zhi Li, Weiguo Jiang, Ling Huang, Xingming Hao, Rui Tang, Huiming Liu, Yafeng Zhang, Xiaoming Xie
Summary: The length of the dry season over Equatorial Asia has significantly decreased due to increased precipitation in the early dry season. This has led to a significant reduction in fire carbon emissions during the early and peak fire season. Climate models project a further decline in dry season length, indicating further reductions in fire carbon emissions.
NPJ CLIMATE AND ATMOSPHERIC SCIENCE
(2023)
Article
Environmental Sciences
Xuan Liu, Ming-Xiang Yang, Ning-Peng Dong, Wei-Ning Xie, Zhen Guan, Fan Wen, Hao Wang, Deliang Chen
Summary: This study investigates the changes in summer precipitation in the Three-River Headwaters region using observational and ERA5 reanalysis data. The results show an increasing trend in summer precipitation with a significant dry-to-wet transition in 2002. The study also attributes the transition and increased precipitation to changes in atmospheric circulations and water vapor transport.
ADVANCES IN CLIMATE CHANGE RESEARCH
(2023)
Article
Environmental Sciences
Bo Su, Hong-Yu Zhao, Heng Ma, Can Zhang, Deliang Chen, Bin Chen, Yi Huang, Shi-Wei Liu, Tong Zhang, Cun-De Xiao
Summary: This study evaluates the supply and demand potentials of China's glacier water resources and their effects, taking into account the downstream countries' demand. The study reveals the spatial and temporal matches between the supply and demand potentials. It finds that some basins rely heavily on glacier meltwater for water supply, but there are also risks and pressures due to decreasing glacier runoff and increasing population.
ADVANCES IN CLIMATE CHANGE RESEARCH
(2023)
Article
Engineering, Civil
Chi Zhang, Xu Zhang, Qiuhong Tang, Deliang Chen, Jinchuan Huang, Shaohong Wu, Yubo Liu
Summary: Precipitation over the Tibetan Plateau is influenced by systems such as the Asian monsoons, the westerlies, and local circulations. The Indian monsoon, the westerlies, and local circulations are the main systems affecting precipitation over the entire Tibetan Plateau. The East Asian summer monsoon primarily affects the eastern Tibetan Plateau. The Indian monsoon has the greatest influence on precipitation in the southern and central grid cells, while the westerlies have the greatest influence on precipitation in the northern and western grid cells. Local circulations have the strongest influence on the central and eastern grid cells.
JOURNAL OF HYDROLOGY
(2024)
Article
Multidisciplinary Sciences
Ziqian Zhong, Bin He, Hans W. Chen, Deliang Chen, Tianjun Zhou, Wenjie Dong, Cunde Xiao, Shang-ping Xie, Xiangzhou Song, Lanlan Guo, Ruiqiang Ding, Lixia Zhang, Ling Huang, Wenping Yuan, Xingming Hao, Duoying Ji, Xiang Zhao
Summary: In recent decades, there has been an increase in the diurnal temperature range, with daily maximum temperatures warming at a faster rate while daily minimum temperatures remain stable. This may be due to reduced cloud cover leading to increased solar radiation.
NATURE COMMUNICATIONS
(2023)
Article
Environmental Sciences
Chi Zhang, Deliang Chen, Qiuhong Tang, Jinchuan Huang
Summary: This study tracked and quantified the moisture originating from the Tibetan Plateau (TP) and its influence on downwind regions. The findings show that the TP moisture has the strongest impact on precipitation in the eastern boundary of the TP, gradually diminishing eastward. The TP moisture ratio in precipitation reaches its highest over the central-eastern TP, accounting for over 30%. A significant portion of TP annual evaporation is recycled within the TP, while the majority is reprecipitated over terrestrial China. The recycling of TP moisture exhibits seasonal variation determined by precipitation, evaporation, and wind patterns.
WATER RESOURCES RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Qin Wen, Chenyu Zhu, Deliang Chen, Mengyu Liu, Liang Ning, Mi Yan, Jian Liu, Zhengyu Liu
Summary: This study separates the heat flux and freshwater feedback in the AMOC change and finds that they dominate at different timescales. It provides important insights into understanding the mechanism of AMOC under global warming.
GEOPHYSICAL RESEARCH LETTERS
(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)
