RSC Advances
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2015
·Vol. 5
·期 87
·70743-70748
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IF 3.84
Zhiwei Liu,Ping Li,Fuqiang Zhai,Qi Wan,Alex A. Volinsky,Xuanhui Qu
Nanostructured tungsten carbide with high surface area and containing amorphous carbon is prepared by a low temperature combustion synthesis method. The nanostructured tungsten carbide is used as the catalyst in a gas diffusion electrode. The obtained WC with different carbon content was investigated by XRD, FESEM, TG-DTA, BET and XPS. When the molar ratio of C/W is 19/3, the WC particles with different carbon content are obtained after a carbonizing process between 900 and 1400 °C, and the content of free carbon in WC also increases gradually with temperature. The carbon content is tested by the high frequency combustion-infrared absorption method in a carbon sulfur analyzer. The electrochemical properties of the tungsten carbide for the oxygen reduction reaction are characterized by its polarization curves and electrochemical impedance. The results show that the presence of the appropriate amorphous carbon is beneficial for improving the conductivity and dispersibility of the tungsten carbide catalyst, and more active centers can be provided by the catalyst.
研究领域:
材料科学
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电化学
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纳米催化
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能源材料
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表面科学
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2025
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IF 3.8
Qiqiang Zhang,Lei Cao,Bo Peng,Hui Zhang,Xingyuan San,Yanchun Zhou,Man Jiang,Qingguo Feng,Chunfeng Hu
MAX phase ceramics, as a family of ternary layered ceramics, have received a lot of attention in the past decade due to their potential as precursors for two-dimensional transition metal carbides. However, due to complex multi-component metallurgical reactions, multicomponent MAX phase ceramics have always faced difficulties in purification and homogenization. This paper identifies a new strategy for synthesizing multicomponent MAX phase ceramics that can eliminate these synthesis difficulties. This path utilizes low-temperature (below 1000°C) stable Ti 2 AlC and carbide powder as initial materials to simplify complex multi-component reactions into a one-step reaction, successfully achieving high purity and precise doping ratio. As an example, four novel doped MAX phase ceramics, Ti 2 MAlC 2 (M = Nb, Ta, W) and Ti 2 HEAlC 2 (HE = 1/7Ti, 1/7V, 1/7Zr, 1/7Nb, 1/7Hf, 1/7Ta, 1/7 W) were successfully synthesized using this method. This dynamic-based design, on one hand, simplifies the reaction mechanism to make purification easier, and on the other hand, the concentrated release of entropy during the reaction process promotes phase transition and related element homogenization.
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Coatings
·
2023
·Vol. 13
·期 7
·1246
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IF 3.4
Wenjuan Qi,Desheng Ding,Weijie Luo,Weiliang Jin,Qian Kou,Chuntao Ge,Saijun Xiao
The hardness and wear resistance of amorphous Al–Mn alloy coatings can be improved by incorporating ceramic particles into them to extend their application. In this paper, Al–Mn/WC composite coatings have been prepared with electrodeposition in stirred AlCl3–NaCl–KCl–MnCl2molten salts at 180 °C with the addition of WC particles. The effects of stirring speed (400–700 rpm) and cathode current density (15–75 mA/cm2) on the produced Al–Mn/WC composite coatings have been studied. At 600 rpm and 700 rpm, the Al–Mn/WC composite coatings exhibited the best uniform distribution of the embedded WC particles, with the tested microhardness value up to 650 HV0.1, compared with 530 HV0.1of the Al–Mn alloy. Moreover, under various cathode current densities, the best quality of the Al–Mn/WC composite coating was obtained at 55 mA/cm2, with a homogeneous distribution of WC particles and the highest microhardness value (670 HV0.1). It is expected that this method could be extended to be applied for the preparation of aluminum-based and magnesium-based ceramic composite coatings.Keywords:AlCl3–NaCl–KCl–MnCl2molten salts;electrodeposition;WC particles;Al–Mn/WC composite coating
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Journal of Materials Research and Technology-JMR&T
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2023
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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.
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MATERIALS SCIENCE AND TECHNOLOGY
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2022
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IF 2.06
Hong Zeng,Wenbin Liu,Chongbin Wei
This study investigated the microstructure and properties of cemented carbides before and after the addition of Ru. The hardness and elastic modulus of the binder phase of Ru-containing cemented carbides were higher, and the hardness at room temperature and high temperature were also high. In particular, the oxidation resistance of Ru-containing cemented carbides was enhanced at high temperatures. Therefore, the solid solution-strengthening effect of the binder phase containing Ru was significant, which was conducive to the improvement of the high-temperature hardness and enhancement of the high-temperature characteristics of the alloy.
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CHEMOSPHERE
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2022
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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.
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PubMed
高影响因子
ENGINEERING FAILURE ANALYSIS
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2022
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IF 3.634
Anhua Ren,Min Kang,Xiuqing Fu
Ni/WC-MoS 2 composite coatings were fabricated in electrolytes with different MoS 2 doping levels using jet electrodeposition. We investigated the surface characteristics of Ni/WC-MoS 2 composite coatings, including the composition, surface morphology, microhardness and tribological behaviour. We also analysed the Ni/WC-MoS 2 composite coating wear mechanism during the wear process. The outcomes determined that Ni/WC-MoS 2 coatings had better surface quality, smaller grain size and larger coating thickness than Ni/WC coatings. The doping of MoS 2 promoted the deposition of WC in the coatings, which further enhanced the microhardness of the coatings. The Ni/WC-MoS 2 composite coatings doped at a MoS 2 concentration of 5 g/L exhibited a maximal microhardness of 730 HV 0.1 . Doping by MoS 2 effectively minimized the coefficients of friction ( CoFs ) of the composite coatings to 0.3. During the wear process, the repair effect of MoS 2 and formation of oxidised friction films transformed the adhesive wear into oxidative wear assisted by abrasive wear, which improved the abrasion resistance of the coatings and diminished the wear rate. The wear rate of the Ni/WC-5 g/L MoS 2 composite coating decreased by 47.34 % in comparison with that of coatings without MoS 2 doping, which was 7.44 × 10 4 μm 3 /N∙m. The findings indicate that doping MoS 2 can effectively enhance the surface wear resistance. This research provides a practical approach to prolong the service life of metal parts.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
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2022
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IF 6.044
Dezhi Wang,Dongyang He,Kai Li,Zhuangzhi Wu
The strength enhancement is critical for the application exploration of Mo-based materials. In this work, a secondary phase of WC is introduced into the Mo matrix, and the corresponding phase, microstructure and mechanical properties have been studied. It is found that the addition of WC particles can significantly improve the mechanical properties, leading to a high ultimate tensile strength (UTS) of 591.5 MPa and a hardness of 242.7 HV over the sintered Mo–12%WC composite, which are about 21.2% and 49.5% higher than those of pure Mo, respectively. During the sintering, the additive WC particles react with the Mo matrix to in-situ generate W and Mo 2 C, and the former is dissolved into the Mo matrix to exhibit solid solution strengthening. Besides, the latter hinders the migration of grain boundaries (GBs) to limit the grain growth of Mo, resulting in smaller grain size. More importantly, the Mo 2 C ( 1 ‾ 2 ‾ 1 ) can gain coherent interfaces with Mo ( 1 1 ‾ 0) to intensify the phase boundary. This work paves a way for the design of high-performance composites through the in-situ reinforcement of decomposable additives.
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Journal of Materials Research and Technology-JMR&T
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2021
·
IF 5.039
Hui Jin,Renjie Ji,Tiancong Dong,Shuo Liu,Fan Zhang,Lilong Zhao,Chi Ma,Baoping Cai,Yonghong Liu
Nickel-iron alloy is broadly utilized in the industrial field due to its fabulous mechanical properties. How to prepare nickel-iron alloy with better corrosion resistance more efficiently is an important concern. Based on this, the WC particles enhanced nickel-iron coatings were fabricated by jet electrodeposition (JED) at a high current density of 100A/dm 2 . It was found that increasing the deposition temperature appropriately during JED is beneficial to obtain Ni-Fe-WC coating with the higher number of hard particles. Specifically, the maximum WC particles proportion reaches 4.47 wt% at 55 °C. The electrochemical corrosion behavior of coating was measured by polarization curve and electrochemical impedance spectroscopy (EIS). The polarization curve test results displayed that the E corr positively shifted from −0.402 to −0.281 V and the i corr reduced from 25.13 to 7.05 μA/cm 2 with the increase of WC particles proportion. Meanwhile, the EIS test results exhibited that the impedance of coating enhanced from 12,720 to 59,140 Ω cm 2 . The neutral salt spray test (NSS) was used to simulate the corrosion of coating in a seawater environment. The NSS results showed that with the increase of WC particles, the corrosion products decreased gradually and the degree of corrosion decreased. The analysis showed that WC particles can help the grain growth and release the internal stress in the coating. Larger grain sizes reduces intergranular corrosion and smaller internal stress help to alleviate stress corrosion cracking. The above research can provide theoretical support for the efficient preparation of particle enhanced composite coating with strong corrosion resistance.
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Materials
·
2021
·Vol. 14
·期 24
·7655
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IF 3.623
Huaijiu Deng,Mattia Biesuz,Monika Vilémová,Milad Kermani,Jakub Veverka,Václav Tyrpekl,Chunfeng Hu,Salvatore Grasso
We report on an ultrarapid (6 s) consolidation of binder-less WC using a novel Ultrahigh temperature Flash Sintering (UFS) approach. The UFS technique bridges the gap between electric resistance sintering (≪1 s) and flash spark plasma sintering (20–60 s). Compared to the well-established spark plasma sintering, the proposed approach results in improved energy efficiency with massive energy and time savings while maintaining a comparable relative density (94.6%) and Vickers hardness of 2124 HV. The novelty of this work relies on (i) multiple steps current discharge profile to suit the rapid change of electrical conductivity experienced by the sintering powder, (ii) upgraded low thermal inertia CFC dies and (iii) ultra-high consolidation temperature approaching 2750 °C. Compared to SPS process, the UFS process is highly energy efficient (≈200 times faster and it consumes ≈95% less energy) and it holds the promise of energy efficient and ultrafast consolidation of several conductive refractory compounds.Keywords:tungsten carbide;ultrarapid consolidation;ultrahigh temperature flash sintering
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PubMed
高影响因子
Surfaces and Interfaces
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2023
·
IF 6.2
Anhua Ren,Min Kang,Xiuqing Fu,Fan Zhang,Wanting Yang,Tianyu Pan
This work aims to improve nanoparticle agglomeration, which hinders the application of nanoparticles in enhancing coating properties. Superhydrophobic and corrosion-resistant Ni–B– MoS 2 @WC composite coatings were prepared with the help of a simple and inexpensive combination of hydrothermal and electrodeposition techniques. Hydrothermal treatment at 180°C for 24h greatly reduced the specific surface area and improved the hydrophobicity of WC@MoS 2 powder. The WC@MoS 2 powder showed good dispersion stability in the electrolyte solution. Ni–B/WC@MoS 2 composite coatings were prepared through codeposition with metallic Ni 2+ under the action of ultrasonic waves. WC@MoS 2 powder doping induced the coatings to exhibit a selective orientation of the (111) crystal plane. Ultrasound-induced cavitation increased the participation of nanopowders in the adsorption codeposition of Ni ions. After WC@MoS 2 powder doping, the surface roughness of the prepared composite coatings furthered significantly, facilitating the wettability transition. This work investigated the relationship between the surface wettability of the coatings prepared via jet electrodeposition and WC@MoS 2 powder doping under auxiliary ultrasonic power. In addition, the effect of surface hydrophobicity on corrosion resistance was examined through electrochemical corrosion tests. The enhanced corrosion resistance of the composite coatings benefits from their enhanced surface roughness and superhydrophobicity. This research offers a proven strategy for improving nanopowders' wettability and composite coatings' corrosion resistance.
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INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
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2023
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IF 3.6
Dongyang He,Hailang Liu,Zhuangzhi Wu,Dezhi Wang
The low ductility of refractory Mo-based materials limits their further processing and wide applications. To address this challenge, a composite strengthening and toughening strategy was proposed by the simultaneous addition of WC and La 2 O 3 . And a collaborative improvement of strength and ductility is achieved over the as-sintered Mo-WC-La 2 O 3 , exhibiting a total elongation (TE) of 33.63% and an ultimate tensile strength (UTS) of 611.33 MPa, about 50.27% and 24.76% larger than those of pure Mo, respectively. Furthermore, the corresponding microstructural features and tensile fracture behavior were also discussed to explore the improvement mechanism. And it is found that the enhancement should be attributed to the high relative density, grain refinement, generated substructures and secondary phase particle refinement. Moreover, the additional toughening mechanisms of crack deflection, particles pull-out and crack halt can also prevent crack extension, which helps to give full play to the potential ductility of Mo composites. This work provides a new pathway for manufacturing advanced Mo-based products with excellent strength-ductility balance.
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