INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2022
·
IF 4.804
Xiao-Chun Deng,He Zhang,Guo-Hua Zhang
Combining spray drying and in-situ synthesized technology, WC-10Co cemented carbides with uniform composition was prepared by vacuum sintering to investigate the effects of different CeO 2 contents (0 wt%, 0.5 wt%, 1 wt%, 2 wt%, 4 wt%) as well as co-doping with CeO 2 and VC on the microstructure and mechanical properties . With increasing CeO 2 addition from 0 wt% to 0.5 wt%, the WC grain size decreased from 0.79 ± 0.35 μm to 0.62 ± 0.24 μm. The hardness, fracture toughness and transverse rupture strength (TRS) of the alloy with 0.5 wt% CeO 2 all reached the maximum values of 1752 ± 28 HV 30 , 18.50 ± 0.35 MPa·m 1/2 and 2245 ± 35 MPa, respectively, which indicated that the mechanical properties of cemented carbide could be simultaneously improved by adding 0.5 wt% CeO 2 to refine the WC grains. However, as the CeO 2 content increased to 4 wt%, the hardness gradually decreased, while the fracture and TRS all slightly decreased first and then tended to be stable. Moreover, the corrosion resistance of alloys first increased and then decreased with the increase of CeO 2 content. The 0.5 wt% CeO 2 alloy had the best corrosion resistance. After adding 0.5 wt% VC, the grain size of alloys became smaller and distribution of Co binder was more uniform. Compared to the samples with only added CeO 2 , the alloy with co-addition of 0.5 wt% CeO 2 and 0.5 wt% VC exhibited the best comprehensive mechanical properties. The hardness, fracture toughness and TRS of the alloy with co-addition of 0.5 wt% CeO 2 and 0.5 wt% VC were 1987 ± 44 HV 30 , 16.10 ± 0.34 MPa·m 1/2 and 2023 ± 78 MPa, respectively.
研究领域:
材料科学
·
冶金学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Qi Wang,Jing Du,Yuan-Yuan Ma,Xiao-Yu Yin,Ze-Yu Tian,Zhan-Gang Han
Electrocatalytic hydrodechlorination (EHDC) provides a promising approach to efficiently remove the halogenated organic pollutants in water. Herein, a kind of noble-metal-free three-dimensional (3-D) hierarchical nickel-tungsten carbide (Ni-WC) heterostructure supported on nickel foam (NF) (Ni-WC/NF) was fabricated via the in-situ hydrothermal growth and annealing treatment of Ni,W-rich polyoxometalate {Ni 54 W 72 }. Featuring self-supported 3-D hierarchical skeleton structures and abundant Ni-WC interfaces, Ni-WC/NF exhibited high-efficient EHDC performance towards 4-chlorophenol (4-CP) with 100 % conversion efficiency in 3 h, large reaction rate constant of 2.2 × 10 -2 min −1 and high current efficiency of 13.9 %, which is comparable to the-state-of-the-art Pd-based catalysts. The active atomic hydrogen (H*) generation kinetics and the interactions of Ni-WC heterostructure with 4-CP/phenol were evaluated. DFT calculations demonstrated that the coverage of 4-CP determines the EHDC efficiency, the Ni-WC heterostructure optimizes the electronic structure of Ni, enhances the adsorption of 4-CP and facilitates the desorption of phenol, thus promoting EHDC performance. This work provides an efficient noble-metal-free catalyst for enhanced electrochemical dechlorination in organic-pollutant treatment.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Xiangyu Tian,Yilong Liang,Guanyu He,Liangliang Zeng
Graphene oxide (GO) was used to adsorb submicron alumina (Al 2 O 3 ) as a composite reinforcing phase, and after sintering, the reduced GO and Al 2 O 3 synergistically enhanced the performance of WC-8Co cemented carbide . It was worth noting that the enhanced phase existed at the grain boundary in the form of RGO/Al 2 O 3 adsorption structure or partial alumina alone, which wraped the WC grain and hindered its growth. The results showed that the strengthening mechanism of the alloy was grain refinement, dispersion, solid solution , etc., and it was calculated that grain refinement was the main mechanism of alloy hardness enhancement. When 0.1 wt% RGO/Al 2 O 3 was added, the average grain size of the alloy was reduced to 0.65 μm, and the density reached 99.46%. Additionally, the mechanical properties of the alloy were optimized in this study. For WC-8Co-0.1RGO/Al 2 O 3 alloy, the hardness was increased by 18.05%, and the fracture toughness was increased by 27.24% relative to the control sample. In addition, the RGO/Al 2 O 3 significantly enhanced the thermal conductivity of the alloy, promoted densification, and reduced the degree of oxidative wear caused by friction. RGO/Al 2 O 3 in the alloy protected the matrix and improved its frictional resistance by adhering to the surfaces of the wear tracks and combining with the wear debris to form a stable friction layer.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
Journal of Materials Research and Technology-JMR&T
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2023
·
IF 6.4
Xinyue Mao,Qingnan Meng,Mu Yuan,Sifan Wang,Shiyin Huang,Baochang Liu
The weak interfacial strength between Fe-based matrix and diamonds causes diamond particles to fall off prematurely, significantly affecting the cutting efficiency of diamond composites. This work aimed to optimize the interfacial microstructure and mechanical properties of the diamond/Fe-Ni-WC composites by coating a Mo 2 C layer on the diamond particles. The Mo 2 C-coated diamonds were prepared via the molten salt method. Diamond/Fe-Ni-WC composites were sintered by the hot-pressing process under a vacuum. The bending strength of composites with Mo 2 C-coated diamonds was improved from 804 to 996 MPa with the increased coating time. The energy dispersive spectroscopy scanning indicated that the Mo 2 C coating layer changed the interfacial composition between the matrix and the diamonds from Fe–C alloy to Mo 2 C, improving the interface strength. Moreover, the diamond protrusion heights of composites were raised by adding a Mo 2 C interface, resulting in an improvement in the cutting efficiency of impregnated diamond tools.
研究领域:
材料科学
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机械工程
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Shiqi Sun,Yanjun Chen,Jun Cheng,Zeyi Tian,Chao Wang,Guangping Wu,Changcheng Liu,Yanzhong Wang,Li Guo
Na 3 V 2 (PO 4 ) 3 (NVP) has gained enormous attentions due to the high capacity and voltage platform. Nevertheless, poor intrinsic electronic conductivities severely restrict the further development. Herein, a feasible strategy to construct unique dimensional gradient structure of the wolfram doped NVP is proposed via a facile sol–gel method. The introduction of W 6+ with the smaller ionic radius parallelized with local V 3+ ions could stabilize the open NASICON structure of NVP and generate vast of beneficial holes to accelerate the electronic transportation. Notably, the wolfram can combine with the superfluous carbon layer and form the new conductive WC phase to further promote the electronic conductivity. Meanwhile, the coated carbon layers and enwrapped CNTs construct an effective conductive framework for accelerated electronic migration. The twining CNTs promote to inhibit the growth of the sintered grains, reducing the particle size to provide shortened pathway for the migration of Na + . Distinctively, the modified Na 2.97 V 2.99 W 0.019 (PO 4 ) 3 /C@CNTs (W0.01-NVP) composite delivers a superior electrochemical performance. Significantly, it can submit a high reversible capability of 112.5 mAh g −1 at 5C with retaining 86% initial capacity over 500 cycles. As for a super high rate of 50C, it reveals an incredible capacity of 92.6 mAh g −1 and remains 84.5 mAh g −1 over 400 cycles, corresponding to a high retention of 91.30%. The superior electrochemical performance is derived from the enhanced crystal structure resulted from wolfram substitution and the beneficial dimensional conductive system consisting of new WC phase, coated carbon layers and enwrapped CNTs.
研究领域:
材料科学
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电化学
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能源存储
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无机化学
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纳米科技
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DOI
高影响因子
ChemSusChem
·
2018
·Vol. 11
·期 6
·1082-1091
·
IF 7.411
Ya Gao,Zhongling Lang,Feiyang Yu,Huaqiao Tan,Gang Yan,Yonghui Wang,Yuanyuan Ma,Yangguang Li
The hydrogen evolution reaction (HER) produces clean hydrogen through an electrochemical process. However, new nonprecious-metal electrocatalysts for the HER are required to reduce the consumption of energy. Herein, we report a new Co 2 P/WC nano-heterojunction that consists of Co 2 P and WC composite phases coated with a few-layer N-doped graphitic carbon shells (Co 2 P/WC@NC). The composite was prepared by a one-step annealing of the polyoxometalate Na 9 (NH 4 ) 5 [{(B-α-PW 9 O 34 )Co 3 (OH)(H 2 O) 2 (Ale)} 2 Co]⋅35 H 2 O (Co 7 P 6 W 18 ) and dicyandiamide (DCA). The preparation method consisted of the simultaneous phosphorization of Co and carbonization of W in a confined space to isolate a Co 2 P/WC nano-heterojunction phase for the first time. Co 2 P/WC@NC facilitated the generation of hydrogen in the electrolysis process, which had an overpotential of only 91 mV at a current density of 10 mA cm −2 in the acid solution; an excellent HER performance (2 H + +2 e − →H 2 ) and Tafel slope (40 mV dec −1 ) as well as durability over a period of 50 h were achieved. Theoretical calculations showed that the Co 2 P, WC, and N pyridinic C dopants in the material synergistically promoted the HER activity rather than the individual constituents. Furthermore, Co 2 P/WC@NC nano-heterojunctions showed good HER performance in the whole pH range of electrolytes and considerable durability in acidic media containing transition metal ions, which may attract more attention for the exploration and optimization of nano-heterojunction catalysts for the HER. Graphical Acids and Bases don′t matter : A Co 2 P/WC nano-heterojunction consisting of cobalt phosphide and tungsten carbide composite phases coated with a few-layer N-doped graphitic carbon shells (Co 2 P/WC@NC) exhibits excellent activity toward the hydrogen evolution reaction over the whole pH range. Theoretical calculations show that the Co 2 P, WC, and N pyridinic C dopants in the material synergistically promote the HER activity.
研究领域:
电化学
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材料科学
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能源催化
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纳米材料
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氢能
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2026
·
IF 4.7
Zirui Liu,Zihang Chen,Kaihua Shi,Chaoqun Peng,Richu Wang,Xiaofeng Wang
Steel-bonded hardmetals integrate high hardness and outstanding toughness, making them widely used in molds and wear-resistant components. However, the fabrication of such materials with complex geometries via conventional powder metallurgy still poses considerable challenges. Vat photopolymerization additive manufacturing (VP-AM) provides a novel approach for producing high-precision cemented carbide parts with intricate structures, yet the role of grain growth inhibitors in this processing route remains unclear. In this study, the effect of the traditional grain inhibitor Cr 3 C 2 on the microstructure and properties of VP-AM-fabricated WC-316L steel-bonded hardmetals was systematically investigated. WC-316L slurries with 0, 0.3, 0.6, and 0.9 wt% Cr 3 C 2 were prepared, followed by VP-AM, debinding, and sintering. The slurry properties, printability, sintered relative density, microstructure, mechanical properties, and wear resistance were comprehensively characterized. Results show that the addition of Cr 3 C 2 up to 0.9 wt% does not compromise the shear-thinning behavior or sedimentation stability of the slurry. At an optimal Cr 3 C 2 addition of 0.3 wt%, the sintered relative density reaches a maximum of 99.0%, and WC grains are significantly refined—with the average grain size decreasing from 1.60 μm to 1.44 μm. Consequently, the material attains a hardness of 822.47 HV and a transverse rupture strength (TRS) of 1538.35 MPa, coupled with exceptional wear resistance. Excessive Cr 3 C 2 addition (>0.3 wt%) leads to performance degradation due to Cr segregation and reduced densification. This study clarifies the optimal addition content and mechanism of Cr 3 C 2 in the VP-AM WC-316L system, providing a valuable reference for composition design and process optimization of high-performance complex steel-bonded hardmetals.
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DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Baolin Chang,Lingling Tang,Xian Zhang,Ji Li,Zhizhang Shen,Jinze Lyu
Solar energy conversion is a promising strategy to enhance the elimination of volatile organic compounds (VOCs) and minimize power consumption. Herein, non-noble metal WC@WO 3 as cocatalyst was composited with CeO 2 to optimize photochemical and photothermal conversion for the catalytic ozonation of toluene and acetone. The photothermal conversion efficiencies of visible and infrared lights on 20%WC@WO 3 –CeO 2 were 2.2 and 10.4 times higher than those on CeO 2 , respectively, which indicates that the equilibrium temperature of the catalyst remarkably increased under full-spectrum light irradiation. Moreover, WC@WO 3 transferred electrons to CeO 2 in 20%WC@WO 3 –CeO 2 and thus remarkably improved the activity of catalytic sites. The synergy factor of light and O 3 on 20%WC@WO 3 –CeO 2 was 5.8, and the reaction rate of toluene and acetone reached 9274.5 and 35779.0 mg/(m 3 ∙min), respectively. This work provides a low-cost and high-efficient catalyst for the utilization of solar energy for VOC control.
研究领域:
环境科学
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催化
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材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xuechao Liu,Mao Chen,Chunyan Shi,Guoqi Liu,Hongxia Li,Hailong Wang,Bingbing Fan,Yongqiang Chen
In this work, polycrystalline cubic boron nitride (PcBN) carbide insert was prepared by a six-anvil high-pressure apparatus at 1500 °C and 5.5 GPa, integrated sintering with different alloy substrates of the Co content. This work studied the effects of different Co content in alloy substrates on phase composition, microstructure, and mechanical properties of the PcBN carbide insert. The result shows that the binder reacted with cBN particles to produce AlN, AlCo, TiB 2 , W 2 B, and Co 2 B. At the same time, transgranular fracture is wide spread in the sintered body. The flexural strength and hardness of the PcBN carbide insert first increase and then fall. When the alloy substrate is WC-11.5 wt% Co, the PcBN carbide insert shows excellent comprehensive performance, with the flexural strength and hardness reaching 1675.67 MPa and 4100.51 Hv, respectively. Through integrated sintering, Co in the alloy substrate diffused and reacted with the binder in the cBN network at the bonding interface, forming a transition area that significantly improves the bonding strength.
研究领域:
材料科学
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机械工程
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2026
·
IF 4.7
Song Zeng,Jiuming Yu,Wenfu Chen,Chang Jiang,Youxing He,Yiyou Wu,Lei Lu,Linwei Zhang
This study elucidates the chemical mechanism for synthesizing Y-doped tungsten-based precursors using a wet chemical method and investigates its impact on WC-Co cemented carbides. It is found that the acidity (H + concentration) critically determines the precursor phase, morphology, and Y doping efficiency. At moderate acidity, amorphous white tungstic acid nanoparticles rich in W–OH bonds are formed, enabling efficient Y doping (0.34 wt%) through coordination. The resulting Y-doped WC-Co sintered body exhibits a refined microstructure: the average WC grain size decreases from 0.468 μm to 0.388 μm, the WC phase increases from 89.47% to 92.45%, and the brittle Co₃W₃C phase decreases from 9.46% to 6.64%. Y₂₈O₇₂Co₀.₁₅-type precipitates, identified at grain boundaries, contribute to grain refinement via Zener pinning and likely help stabilize the phase composition. This work clarifies the complete pathway from precursor design to microstructure optimization in WC-Co alloys.
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2026
·
IF 4.7
Ruoyu Chen,Ping Liu,Chengpeng Cai,Wenbao Jia,Guoqi Liu,Minghui Li,Saisai Li,Aiqin Mao
High-entropy carbide (HEC) was introduced into WC–Co cemented carbides to simultaneously enhance microstructural stability, physical properties, oxidation resistance, and radiation tolerance. The influence of carbon stoichiometry of HEC x (0.8, 1.0, and 1.2) on WC grain refinement, density, oxidation behavior, and He irradiation-induced damage evolution was systematically investigated. The results demonstrated that HEC 0.8 with carbon vacancies exhibited the most pronounced grain-growth inhibition effect through enhanced lattice distortion, sluggish diffusion, and grain boundary pinning. As a result, the WC–10Co-HEC 0.8 composite achieved outstanding mechanical properties, including a hardness of 20.7 GPa, fracture toughness of 13.5 MPa·m 1 ᐟ 2 , and flexural strength of 3525 MPa. Furthermore, HEC 0.8 effectively improved oxidation resistance and suppressed irradiation-induced defect evolution by providing abundant defect trapping sites. This work highlights carbon stoichiometry engineering in HECs as a promising strategy for developing WC–Co cemented carbides with superior multifunctional performance.
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2018
·Vol. 101
·期 8
·3617-3626
·
IF 2.956
Deng Pan,Shufeng Li,Xin Zhang,Bo Pan,Shengyin Zhou,Yabo Fu,Katsuyoshi Kondoh
Strip-shaped W 2 B 5 reinforced B 4 C ceramic composites were prepared via in situ reaction of boron(B)-graphite(Gr)-WC system by powder metallurgy (P/M). In order to study the effect of the graphite content on the properties of the as-fabricated ceramic composites, the powder mixture of B-Gr-WC with various amounts of Gr powder were blended and consolidated by spark plasma sintering (SPS). The sintering parameters were shown as following: sintering pressure was set as 30 MPa; The three-step sintering temperature was 1100-1550-1700°C and the duration time was set as 5-5-6 minutes, respectively. In situ formed strip-shaped W 2 B 5 particles were dispersed homogeneously in B 4 C matrix, which resulted in a remarkable improvement on the fracture toughness and mechanical properties. Appropriate 5vol% residual Gr in the composite shows positive effect on the mechanical properties which achieved an optimal counter-balance of fracture toughness and hardness, the relative density was 99.8%, the Vickers hardness can reach 30.2 GPa, and the fracture toughness was 11.9 MPa·m 1/2 when the sintering temperature was set at 1700°C.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）