TRIBOLOGY INTERNATIONAL
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2025
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IF 6.9
Zheng Yang,Zihan Wang,Jinjin Li,Songlin Ding,Shuang Yi
Magnesium alloys, valued for low density and high strength, are extensively used but challenged by poor corrosion resistance, complicating machining processes. This study introduces a novel bio-microcapsule nanofluid combining diatomite earth (DE) and Mo₂CTₓ MXene nanoparticles as cutting fluids. Comprehensive tests analyzed cutting forces, friction, tool wear, surface quality, and chip morphology. Results showed DE@Mo₂CTₓ MXene nanofluids reduced cutting force by 29.6 %, friction force by 65.7 %, surface roughness from 6.2 μm to 2.1 μm (66.1 % improvement), and coefficient of friction from 0.55 to 0.29. These nanofluids demonstrated superior lubrication and heat dissipation, significantly enhancing machining performance and surface integrity, highlighting promising applications for precision-critical industries machining magnesium alloys.
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
CERAMICS INTERNATIONAL
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2025
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IF 5.6
Hao Fu,Qinghua Zhao,Yuqi Zhang,Xichao Dong,Xingang Luan,Laifei Cheng
The thin-film electrode, as the core unit of wireless passive surface acoustic wave sensors, undertakes the signal conversion function. However, finding materials for thin-film electrodes that endure high temperatures while retaining excellent conductivity remains a formidable challenge. In this research, a series of SiHfBCN-based films doped with different fillers were fabricated via the polymer-derived ceramic method. Subsequently, the effect of film microstructure on room- and high-temperature conductivity was studied. Results showed the sole MoB 2 -doped film demonstrated the best electrical conductivity at room temperature. In contrast, adding CNTs lowered film conductivity due to filler agglomeration. Nevertheless, higher film pyrolysis temperatures built better conductive networks. At high temperatures, SiHfBCN-based films exhibited much lower resistivity compared to room temperature, with a minimum of 0.1 Ω cm. Moreover, after the high-temperature test, the films still retained a dense surface morphology. These findings strongly suggest SiHfBCN-based films have great promise and application potential for high-temperature electrodes.
研究领域:
材料科学
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无机非金属材料
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高温功能材料
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电子器件材料
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陶瓷工程
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DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
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2020
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IF 3.408
Feng Zhao,Qiang Tao,Cun You,Meiyan Ye,Li Li,Yang Han,Shushan Dong,Xin Wang,Tian Cui,Pinwen Zhu
MoB 2 , with a layered structure, is a potential functional material that is expected to be used as catalysts and conductors. However, the lower hardness limits its application in extreme environment. Solid-solution hardening is a suitable way to enhance hardness and keep structure, but it is complicated in transition metal borides (TMBs) solid solutions . Up to now, uncovering the intrinsic factors of solid-solution hardening is still a challenge. In this work, the structural, electronic and hardness properties of Mo 1-x W x B 2 ( x = 0.01~0.20) is studied to explore the potential factors. It is found that sharp increase in hardness of Mo 1-x W x B 2 at low W doping level (≤5 at%), and highest Vickers hardness of 26.7 ± 1.2 GPa (applied 0.49 N load) was obtained by Mo 0.95 W 0.05 B 2 . The high hardness reason is ascribed to the lattice distortions lead to internal stress at the nanoscale , which created local symmetry reduction by affected local electron distribution of B–B bond and the lattice position of Mo atoms. Moreover, at higher W doping level, TM-B bond is strengthened by increasing electron transfer from the tungsten atoms to the boron atoms , which resulting in the hardness increasing of Mo 1-x W x B 2 . This provides guidance for designing TMBs solid solutions with better mechanical properties.
研究领域:
材料科学
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固体物理
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无机非金属材料
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结构与性能关系
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过渡金属硼化物
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DOI
高影响因子
SURFACE & COATINGS TECHNOLOGY
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2019
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IF 3.192
Lu Zhu,Yousen Zhu,Xuanru Ren,Ping Zhang,Jianghao Qiao,Peizhong Feng
MoSi 2 -MoB-ZrO 2 composite powders are one-step synthesized prepared by self-propagating high-temperature synthesis (SHS), which are further utilized to prepare the oxidation protective coatings by spark plasma sintering (SPS) method on molybdenum substrate. Microstructure and properties of the coatings were investigated and determined. Oxidation behavior of the coatings at high temperature was also studied. The results showed that the composite coating is dense and crack-free due to the addition of ZrO 2 , which is beneficial for the decrease of mismatch in coefficient of thermal expansion, and no void exists in the diffusion layer owing to the diffusion of Si, which is inhibited by adding MoB. Compared with the pure MoSi2 coating, the high hardness of the composite coating is enhanced by about 20% while the fracture toughness of the composite coating is improved by about 25%, which makes the occurrence of intergranular fracture , crack deflection and crack bridging. After oxidation at 1400 °C for 80 h, MoSi 2 coating failed while xMoSi 2 -MoB-3ZrO 2 (x = 3, 4, 5) composite coating still kept its protective effect. Only a little substrate is consumed during oxidation and improved oxidation resistance is gained by MoSi 2 -MoB-ZrO 2 composite coating. 3MoSi 2 -MoB-3ZrO 2 coating shows the relatively best oxidation resistance due to the formation of crack-free oxide film on the surface of the coating.
研究领域:
材料科学
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表面工程
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高温氧化
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陶瓷涂层
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粉末冶金
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Jiahao Zhao,Xiaohui Ma,Mengyao Ren,Jianlin Zhao,Chunhua Yuan,Jinlong Cui,Wenxiu He
The development of efficient and low-cost photocatalysts has always been sought in H 2 production from water cracking. Herein, a series of MoB/Mn 0.43 Cd 0.57 S composites were developed for high-performance photocatalytic H 2 production. Mn 0.43 Cd 0.57 S nanoparticles were deposited on bulk metalloid MoB via a hydrothermal method (as confirmed by morphology tests) to construct a Schottky heterojunction. In the composites, the Fermi levels of Mn 0.43 Cd 0.57 S and MoB were rearranged (as confirmed by ultraviolet photoelectron spectroscopy) and the electrons of Mn 0.43 Cd 0.57 S rapidly migrated to MoB (as confirmed by X-ray photoelectron spectroscopy). Ultimately, the formation of the Schottky heterojunction significantly improved interfacial carrier separation, leading to efficient H 2 production. MoB, which exhibits a Pt-like electronic structure, provided active sites for H 2 evolution in the heterojunction composites. Furthermore, compared with those of Mn 0.43 Cd 0.57 S, the visible-light absorption capacity and H 2 evolution kinetics of the heterojunction composites were also vastly improved. After photocatalytic H 2 production, the performance of all heterojunction composites markedly increased. The performance of the composite with 20 % MoB/Mn 0.43 Cd 0.57 S) was the highest (4146.92 μmol·g −1 ·h −1 ), which was 11.3 times that of Mn 0.43 Cd 0.57 S (367.56 μmol·g −1 ·h −1 ). The stability of the composites was further evaluated, and the 20MoB/Mn 0.43 Cd 0.57 S composite lost only 12.8 % of its activity, indicating its excellent photostability. The underlying mechanism of H 2 production over the heterojunction composites was also investigated. This work provides an innovative approach for achieving high-efficiency H 2 production in a sulfide solid solution modified by a metalloid MoB cocatalyst.
研究领域:
材料科学
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能源科学
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化学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Yiying Sun,Huaimin Wang,Meng Shuang,Chenying Zhou,Yiming Sun,Heng Zhang,Yang Liu,Peng Zhou,Bo Lai
Coupling extra electron supply with iron-mediated advanced oxidation processes (AOPs) is an efficient strategy for long-lasting oxidation of organic contaminants in environmental remediation. Many subsequent attempts have been made, such as homogeneous catalysts and metal catalysts, of which secondary organic pollution and surface passivation layers limit their application. In this work, metal borides as co-catalysts can efficiently accelerate the Fenton reaction by firmly sacrificing electrons to Fe(III) reduction. Among multiple metallic borides, vanadium boride (VB 2 ) performs superiorly as dual active sites to solve the Fe(III) cycle dilemma and quickly generate hydroxyl radicals via Fenton reaction for almost completely eliminating almost carbamazepine (CBZ) in VB 2 /Fe(III)/H 2 O 2 . Characterization analysis and the density functional theory (DFT) calculation unveil that the synergistic effect of V and B on the surface of VB 2 makes Fe-O bonds of FeOH 2+ weaker (from 173.8 pm to 178.4 pm) to produce more active Fe(III) species. And meanwhile, active Fe(III) can be rapidly reduced into Fe(II) on the surface of VB 2 and then be completely released into solution for subsequent Fenton reaction and hydroxyl radical generation. More importantly, VB 2 performs steadily and efficiently for 7th consecutive test in VB 2 /Fe(III)/H 2 O 2 to degrade more than 95% CBZ, resulting from the self-cleaning surface of VB 2 to expose reactive regions for persistent electron sacrifice and sustainably stimulative Fenton oxidation. Therefore, this research offers the detailed fundamental perception into the genesis of VB 2 as well as a novel electron donor for boosting Fenton oxidation towards water remediation.
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产品关联
DOI
PubMed
高影响因子
ACS Catalysis
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2024
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IF 11.3
Miao Liu,Ying He,Ying-Ying Jiao,Ling Ding,Di An,Yang Yang,Qing-Qing Hao,Hui-Yong Chen,Qun-Xing Luo
The nature of Mo-catalyzed glucose epimerization in the aqueous phase was elaborately studied. We herein formulate the thermodynamic properties (e.g., ΔrHT, ΔrGT, and Keq.T) of the reversible epimerization by collecting the equilibrium composition. The isotopic tracing and NMR spectra show that the overall tautomerization network encompasses the reversible epimerization and isomerization and the irreversible degradation of all hexoses. The leaching tests and kinetic and spectroscopic studies reveal that glucose epimerization catalyzed by Mo-containing solid catalysts in the aqueous phase resembles homogeneous catalysis. All catalysts enable a near-equilibrium yield of mannose (28%) at 373 K except MoP but undergo a different kinetic course of which MoN is the best catalyst according to the apparent kinetic parameters. The molybdenum species dissolved in an aqueous solution evolves into the truly active centers of the MoVI–O–MoVI bridged polymolybdates. Moreover, we propose that a single Mo center as Lewis acidic site coordinates with the aldoses to form a bidentate complex, which thereby contributes two different mechanisms to generate the epimers, viz., the intramolecular 1, 2-carbon exchange and two-step isomerization. The former proceeds through a three-membered cyclic transition state (TSC) that mediates the simultaneous cleavage of the bond between C-2 and C-3 and formation of the bond between C-1 and C-3, whereas the latter undergoes two hydride transition states (TSH-1 and TSH-2) via the hydride transfer twice, leading to the chiral inversion of the configuration at C-2. Last but not least, the presence of phosphates in an aqueous solution leads to the deactivation of Mo-based catalysts because of the interplay between glucose and phosphates.
研究领域:
催化化学
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生物化学
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Xian Dang,Zhulin Huang,Jieyan Yuan,Ke Li,Mengen Hu,Zhuoming Xie,Haoran Song,Bensong Chen,Xinyang Li,Ming Li,Xiaoye Hu,Yue Li
High-purity, nano-sized (Ti 0.2 Zr 0.2 Nb 0.2 Mo 0.2 Hf 0.2 )B 2 (TZNMH) diboride powders were successfully synthesized via a combined flocculation precipitation and boro/carbothermal reduction method. Then, the solid solution formation, thermal radiation performance and mechanical properties of TZNMH were investigated. It is found that high entropy effect endows TZNMH ceramic with outstanding near-blackbody radiation performance in the UV-Vis-NIR region, with a thermal emissivity ≥ 95%. This is because high entropy induces robust intraband transition. A dense and single-phase TZNMH ceramic was obtained by spark plasma sintering with high hardness (HV 0.1 =31.6 GPa) which remained above 30 GPa even after 60 h exposure at 1800 °C in Ar environment. This high hardness of TZNMH ceramic is believed to arise from the strong hybridization between metals and boron, as revealed by density functional theory calculations. This study demonstrates that high-entropy boride ceramics can be used as ideal high-temperature structural component with high thermal emissivity.
研究领域:
材料科学
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陶瓷工程
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
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2025
·
IF 26.8
Yuchun Liu,Tianqi Liu,Xinyun Wang,Jing Zhang,Xingwu Zhai,Tianchen Wei,Qianqi Shi,Chengjie Lu,Huan Yan,Yujian Xia,Weiren Cheng,Min Zhou
Li-CO₂ batteries promise ultrahigh theoretical energy densities but face efficiency limitations owing to the sluggish decomposition of stable Li 2 CO 3 . Redirecting the redox pathway toward Li 2 C 2 O 4 overcomes this challenge, but its metastability leads to facile conversion to Li 2 CO 3 during discharge. Herein, subsurface electronic confinement is engineered in Mo-based catalysts, leveraging electron-deficient boron (B) as electron traps in the subsurface atomic layers to tailor their interfacial electronic landscapes. This design elevates the Mo d-band and intensifies the hybridization between the Mo d-orbitals and O p-orbitals of oxalate. Strengthening the Mo-O interaction stabilizes Li 2 C 2 O 4 against decomposition. The highly reversible and stable redox chemistry enabled by MoB results in an exceptional cycling stability and energy efficiency across a wide temperature range, with an expanded practical viability. At 70 µA cm −2 , the MoB-based battery is cycled for >1400 h with a high energy efficiency of >85%. The energy efficiency even remains at >90% for ≈150 h at a high temperature (90 °C). This study pioneers a material design framework for use in stabilizing metastable products within Li-CO 2 batteries, advancing their applicabilities in extreme environments, such as deep-earth exploration, by revealing the role of subsurface charge redistribution in steering reaction pathways.
研究领域:
储能
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材料科学
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电化学
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催化
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纳米技术
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产品关联
DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
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IF 11.4
Shuang Meng,Minglu Sun,Peng Zhang,Chenying Zhou,Chuanshu He,Heng Zhang,Yang Liu,Zhaokun Xiong,Peng Zhou,Bo Lai
The continuous electron supply for oxidant decomposition-induced reactive oxygen species (ROS) generation is the main contributor for the long-standing micropollutant oxidation in the iron-based advanced oxidation processes (AOPs). Herein, as a new class of co-catalysts, metal borides with dual active sites and preeminent conductive performance can effectively overcome the inherent drawback of Fenton-like reactions by steadily donating electrons to inactive Fe(III). Among the metal borides, tungsten boride (WB) exhibits a significant co-catalytic performance run ahead of common heterogeneous co-catalysts and exceptionally high stability. Based on qualitative and semi-quantitative tests, the hydroxyl radical, sulfate radical, and iron(IV)-oxo complex are all produced in the WB/Fe(III)/PDS system and Fe(IV)-induced methyl phenyl sulfoxide decomposition is up to 72%. Moreover, the production efficiency of ROS and relative proportions of radical and nonradical pathways change with various experimental conditions (dosages of PDS, WB, and solution pH) and water matrices. The rate-determining step of Fe(II) regeneration is greatly accelerated resulting from the synergetic effect between exposed metallic reactive sites and nonmetallic boron with reductive properties of WB. In addition, the self-dissolution of surface tungsten oxide and boron oxide leads to a renovated surface for sustainable Fe(III) reduction in long-term operations. Our discovery provides an efficient and sustainable strategy in the field of enhanced AOPs for water remediation.
研究领域:
环境科学
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材料科学
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化学工程
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水处理
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产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）