RARE METALS
·
2016
·Vol. 35
·期 10
·763-770
·
IF 0.957
Wang Wei,Lu Zhong-Chen,Chen Zhi-Hong,Zeng Mei-Qin,Wang Hui,Zhu Min
WC–8Co hardmetals with different proportions of prismatic WC grains and plate-like WC grains were directly produced through sintering the W–C–8Co elemental powder mixture which was fabricated by dielectric barrier discharge plasma (DBDP)-assisted milling. The morphology of prepared WC–8Co hardmetals, geometry and the preferential orientation of plate-like WC were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM) analysis. The results demonstrate that the microstructure and mechanical properties of the sintered hardmetals are related to the morphology of W grain which is dependent on DBDP-milling time. The DBDP for 1 h (DBDP-1 h)-milled W–C–Co powder contains granular W particles that tend to form prismatic WC grains, while the DBDP for 3 h (DBDP-3 h)-milled powder contains lamellar W particles that generate plate-like WC grains. By adjusting the weight ratio of DBDP-1 h powder and DBDP-3 h powder in W–C–8Co mixture, the proportion of plate-like WC in the hardmetals can be controlled, and relatively high transverse rupture strength (TRS) is obtained as the proportion of plate-like WC grain in the hardmetals is about 35 % in present experimental condition. Graphical The DBDP-1 h-milled W–C–8Co powder (Sample A) contains granular W particles that tend to form prismatic WC grains, while the DBDP-3 h-milled powder (Sample B) contains lamellar W particles that generate plate-like WC grains. When the weight ratio of Samples A to B powder is 1:1, Sample A1B1 has relatively high transverse rupture strength (TRS) along both Sections V and P, with proportion of plate-like WC grain of ~35 %.
研究领域:
材料科学
·
陶瓷与硬质合金
·
粉末冶金
·
等离子体加工
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Mengen Hu,Xincan Gao,Zhen Wang,Xian Dang,Chengwan Yang,Xinyang Li,Ming Li,Yue Li,Xiaoye Hu,Zhulin Huang
Tungsten carbide (WC) cemented carbide plays a crucial role in cutting and mechanical processing. However, the grain coarsening that inevitably occurs during the high temperature sintering process of WC leads to a reduction in mechanical properties. This study presents a strategy for the one-step synthesis of tantalum carbide (TaC) grain inhibitors to enhance ultrafine grain WC ceramics. Specifically, WC-xTaC (where x = 0 wt%, 1 wt%, 2 wt%, 3 wt%, and 4 wt%) powders were synthesized directly in one step using a liquid phase method, thereby eliminating the effects of the ball milling process on the defect density and surface energy of the powders. The mechanical properties of the sintered blocks were evaluated after the synthesized WC-xTaC powders underwent hot press sintering. The results demonstrate a reduction in the grain size of WC from 1.96 μm to 850 nm after sintering compared to WC ceramics without TaC doping. The density of the material improved from 91.4 % to 97.8 %, while the hardness increased from 16.3 GPa to 24 GPa, reflecting an overall enhancement of 47.2 %. This research provides an optimized approach for the fabrication of ultrafine grained WC ceramics.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
METALS AND MATERIALS INTERNATIONAL
·
2019
·Vol. 26
·期 9
·1373-1384
·
IF 1.647
Zeng M. Q.,Tu J. L.,Zhu M.,Wang W.,Liu J. W.,Lu Z. C.
The effects of plasma discharge intensity on the microstructure evolution of ball-milled tungsten (W)–carbon (C)–cobalt (Co) mixtures and the formation mechanism of ultrathin plate-like tungsten carbide (WC) grains prepared by ball milling with and without plasma discharge were investigated. It was found that increasing the plasma discharge intensity during ball milling obviously promoted the formation of a thin flake-like W phase because of the electroplasticity effect and simultaneously lowered the carburization temperature between W and C. A combination of high hardness and transverse rupture strength of 92.9 HRA and 3659 MPa, respectively, was obtained for the WC–8Co alloy fabricated by plasma milling at a gas pressure of 5 × 10 3 Pa with a dielectric barrier discharge layer thickness of 3 mm. These properties were mainly attributed to the markedly lowered activation energy of the WC phase and generation of highly oriented ultrathin plate-like WC grains by plasma milling. The combination of the flake-like structure of the plasma-milled W aggregate and high specific interfacial area and short diffusion distance of W/C were readily inherited by the ultrathin plate-like WC grains in the sintered WC–Co hardmetals. Graphic
研究领域:
材料科学
·
粉末冶金
·
陶瓷
·
机械合金化
·
等离子体加工
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 71
·44896-44903
·
IF 3.108
Guochen Zhao,Jinshang Li,Yuanfeng Huang,Liming Yang,Ying Ye,Frank C. Walsh,Jie Chen,Shuncai Wang
Superhydrophobic, water repellent surfaces have attracted much attention but poor surface mechanical properties have limited their wider practical application. Robust surfaces based on nickel–tungsten carbide composite coatings have been electrodeposited. The surfaces showed superhydrophobicity after being modified by stearic acid. The maximum contact angle of water was 164.3 degrees with a sliding angle close to zero. By controlling the deposition conditions, versatile coatings have been produced and the effects of morphology on wettability are discussed. Coating texture has been analyzed by X-ray diffraction. The surfaces showed excellent abrasion resistance and water-repellence.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF POWER SOURCES
·
2014
·
IF 5.211
Lu Wang,Mingtao Li,Zhiyu Huang,Yingming Li,Suitao Qi,Chunhai Yi,Bolun Yang
A nanocluster Ni–WC/C electrocatalyst is prepared through a sequential impregnation method and is used for the urea electrooxidation in alkaline conditions. The micro-morphology, lattice parameter , composition and surface states of Ni–WC/C particles are determined by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), energy dispersive X-ray (EDX) and X-ray photoelectron spectrometry (XPS) analysis. The electrooxidation activity and stability of the Ni–WC/C catalyst are also investigated by cyclic voltammograms and chronoamperograms. Characterization results indicate that the Ni nanoclusters are uniformly distributed on the WC/C framework, and the Ni–WC/C catalyst shows high electrocatalytic activity and stability for urea electrooxidation. The maximum current density at the Ni–WC/C electrode is almost 700 mA cm −2 mg −1 which is one order of magnitude higher than that at the Ni/C electrode, and the steady current density at the Ni–WC/C electrode is also markedly improved. Furthermore, the ESA values and XPS spectra indicate that the enhanced performance of the Ni–WC/C catalyst could be attributed to the structure effect and electron effect between nickel and tungsten carbide .
✓ 已验证
DOI
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2021
·
IF 5.234
Lu Han,Jing Wang,Yuanyuan Chen,Yuan Huang,Yongchang Liu,Zumin Wang
Cu composites strengthened through carbide nanoparticle dispersions (CDS–Cu) usually present a problematic agglomeration of nanoparticles that deteriorate their mechanical properties. To address this issue, in this study, CDS–Cu composites were prepared via spark plasma sintering (SPS) of reduced Cu-coated WC core–shell precursor powders, which were obtained through intermittent electrodeposition . This novel preparation method overcomes the aggregation problem of tungsten carbide (WC) nanoparticles, thereby improving the interface-bonding strength between the reinforcing-phase WC nanoparticles and the Cu matrix and further enhancing the load-transfer efficiency. The yield strength of the Cu-2.1 wt% WC composite prepared via pressureless sintering is up to 243 ± 3 MPa, which is significantly higher than that of pure Cu (130 MPa). Orowan strengthening and grain refinement strengthening induced by dispersed nano-WC particles are the main strengthening mechanisms . Due to the load-transfer strengthening, the yield strength of the SPS composite is improved to 271 ± 2 MPa. After hot rolling, the yield strength is further increased to 315 ± 2 MPa, owing to the additional contribution of dislocation strengthening originating from the plastic deformation process. The proposed method in this study provides an advanced pathway for the preparation of ceramic nanoparticle dispersion-strengthened metals.
研究领域:
材料科学
·
金属基复合材料
·
纳米材料
·
机械工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2026
·
IF 4.7
Zihang Chen,Zirui Liu,Kaihua Shi,Chaoqun Peng,Richu Wang,Xiaofeng Wang
Steel-bonded hardmetals, composites comprising hard ceramic phases within a steel matrix, offer excellent wear resistance crucial for demanding applications. However, using traditional processes to fabricate parts with complicated geometry continues to be difficult. This work shows that complex WC-316 L steel-bonded hardmetal components can be produced using vat photopolymerization (VPP) additive manufacturing. An acidic block copolymer dispersant (P5398, 3 wt%) was found to be the best option after a methodical optimization of the photocurable slurry. This resulted in a low viscosity of 4.79 Pa·s at 100 s −1 and improved stability for a 50 vol% solids loading slurry. Specimens were successfully created using optimized printing parameters (95% laser power, 1000 mm/s scan speed, 0.02 mm hatch spacing) and a customized thermal debinding-sintering profile. Samples from the 50% slurry had minimal surface roughness (Ra = 2.34 μm), a transverse rupture strength of 1173.07 MPa, a Vickers hardness of 794.41 HV, and a relative density of 97.3%. WC particles were uniformly distributed throughout the steel matrix, according to microstructural studies, which contributed to the improved mechanical qualities. This work bridges the gap between geometric freedom and material performance by establishing VPP as a practical and accurate manufacturing route for complexly formed, high-performance steel-bonded hardmetals.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Guangya Hou,Zhongwei Shen,Yiping Tang,Qiang Chen,Huazhen Cao,Huibin Zhang,Guoqu Zheng,Jianli Zhang
Direct methanol fuel cells and direct urea fuel cells are significant for mitigating the energy crisis and protecting the environment. However, as the common critical anodes for the electrooxidation of methanol and urea, most Ni-based catalysts are severely poisoned by the CO group, resulting in a decrease in current densities and stability of fuel cells. Herein, efficient bacterial cellulose (BC)-derived carbon aerogel loaded with Ni-based catalyst and WC nanoparticles co-catalyst was developed for the electrooxidation of methanol and urea. As a result, the catalytic electrode exhibits high electrocatalytic activity for methanol electrooxidation (105.7 mA cm −2 at 0.8 V) and urea electrooxidation (90.4 mA cm −2 at 0.8 V). The synergistic effect between Ni and WC can significantly weaken the surface adsorption of CO on the electrode to obtain excellent and durable electrochemical performance. For methanol oxidation reaction and urea oxidation reaction, the retentions of the peak current density after 2000 cycles in the original electrolytes are 48.94% and 74.79%, respectively. Moreover, applying the new electrolyte, the peak current density can return to 88.42% and 84.4% of the original value.
研究领域:
材料科学
·
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·
IF 2.1
Xiao-Chun Deng,Xiao-Dong Kang,Guo-Hua Zhang
(HfNbTaZrTiMo)C-Co high entropy carbide cermet was fabricated by conventional vacuum sintering. The effect of WC addition on the mechanical properties of cermets was also investigated. For cermets without WC addition, with the extension of sintering time, the hardness of cermets first rose and then fell, while the fracture toughness showed a decreasing trend. The increase in sintering temperature led to a decline in hardness and an enhancement of fracture toughness. The (HfNbTaZrTiMo)C-15 wt. % Co cermet sintered at 1450°C for 2 h had the best comprehensive properties, with the hardness and fracture toughness of 16.36 ± 0.17 GPa and 7.19 MPa·m 1/2 , respectively. After adding WC, there was a typical black core (undissolved (HfNbTaZrTiMo)C phase)-gray rim (seven-component (HfNbTaZrTiMoW)C solid solutions) structure in the cermets. Meanwhile, Mo diffused into WC to form (Mo, W)C solid solutions. The formations of (HfTaZrNbMoTiW)C and (Mo, W)C solid solutions resulted in an improvement in hardness. In addition, since the addition of WC enhanced the wettability between carbides phase and Co phase, the comprehensive properties of cermets were improved. The hardness and fracture toughness of the (HfNbTaZrTiMo)C-42.5 wt. % WC-15 wt.% Co cermet sintered at 1450°C for 2 h were 17.42 ± 0.06 GPa and 8.22 MPa·m 1/2 , respectively.
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2023
·
IF 3.6
Weili Wang,Jinfang Wang,Meng Zhang,Huilin Lan,Shengyang Zhao,Changyu Liang,Feilong Xu,Ling Shao,Dongdong Zhu,Sheng Dai,Yuyuan Yao,Liu Zhu
The mechanical properties and corrosion resistance of binderless tungsten carbide largely determine its performance and lifespan in complex industrial environments. Herein, WC-1Y 2 O 3 -xSiC w (x = 0, 0.5, 1, and 2 wt%) was prepared using the hot-press sintering. The mechanical properties of the composite, as well as the corrosion resistance of optimized mechanical properties in an aggressive medium (0.05 M H 2 SO 4 and 1 M NaOH) were investigated. Results showed that SiC w could significantly increase mechanical properties of the composite, but excessive content (2 wt%) leads to whiskers aggregation and lower properties. The flexural strength and fracture toughness are all increased to varying degrees with whisker content. WC-1Y 2 O 3 -0.5SiC w possesses the optimal mechanical properties. The Vickers hardness , fracture toughness, and flexural strength are 2331.24 HV 30 , 8.59 MPa·m 1/2 , and 1727 MPa, respectively. Electrochemical tests show that the corrosion resistance of the WC-1Y 2 O 3 -0.5SiC w in H 2 SO 4 is higher than that in NaOH solution, and its corrosion resistance in H 2 SO 4 solution increases, but that of the NaOH solution decreases with exposure time. Detailed characterization demonstrated that a dense WO 3 film forms in the H 2 SO 4 solution, resulting in a flatter corrosion surface. In contrast, the WC phase in NaOH solution dissolves, thus leading to the accelerated corrosion rate.
✓ 已验证
DOI
高影响因子
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Shiwei He,Ruidong Xu,Bohao Yu,Yuqing Guo,Zhongsheng Hua,Fuyuan Zhang,Huihong Lv
In this study, β-PbO2-WC composite coatings were synthesized on a substrate using the electrodeposition method in an electrolyte containing Pb 2+ and WC particles. The preparation process study shows that the β-PbO2 bath containing WC particles becomes more stable for an ultrasonic dispersion time within 30 minutes. WC particles in the β-PbO2 bath are positively charged, with anions being adsorbed onto the particles. Compared to the β-PbO2 composite electrode, the oxygen evolution overpotentials for the P-PbO2-WC electrode are decreased, which demonstrates an energy-saving effect. The nucleation behavior study shows that the co-deposition of WC particles into the layer has little effect on the crystal growth of P-PbO2. The main process during the deposition time of 0~5 min were the nucleation of the β-PbO2 grains, the adsorption of WC particles, growth of β-PbO2 grains, and WC particles coated.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 36
·18863-18871
·
IF 11.301
Ye Xiong,Lulu Xu,Caixia Yang,Qingfeng Sun,Xijin Xu
Adjusting the electromagnetic parameters by decorating magnetic particles for improved impedance matching is an important strategy for obtaining lightweight and efficient carbon-based electromagnetic wave-absorbing materials. In this work, a tomato-like hierarchical porous FeCo/C@WC was prepared for efficient microwave absorption, in which a lightweight anisotropic wood carbon aerogel (WC) was used as a structural assistant, and a MOF-derived graphitized carbon-coated FeCo alloy (FeCo/C) served as a dielectric/magnetic regulator. The tomato-like polystage micro-nano construction was made up of a “pericarp” left by the parallel channels of natural wood, a “pulp tissue” of the MOF-derived nanocage and “seeds” of FeCo nanoalloys embedded in a nanocage. The macroporous wooden shell and mesoporous carbon nanocage gave the composite an excellent hierarchical dielectric coupling network. Meanwhile, the uniformly dispersed FeCo nanoparticles enhanced the magnetic loss to the carbonaceous substrate, allowing for better impedance matching. As a result, the constructed multidimensional FeCo/C@WC exhibited superior wave absorbing ability, in which the maximum reflection loss (RL) reached −47.6 dB and the wide absorption bandwidth was up to 8.9 GHz. These excellent results confirmed that wood-based electromagnetic absorption devices may have a good application prospect.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
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