CERAMICS INTERNATIONAL
·
2026
·
IF 6
Yongji Xia,Hanzi Du,Xiantao Yang,Ralf Riedel,Guanghui Yue,Zhaoju Yu
Silicon-based anodes in lithium-ion batteries (LIBs) suffer from significant volume expansion, resulting in poor cycle stability, which seriously hinders their large-scale application in the field of high-performance energy storage. To this end, we design a single-source-precursor derived multicomponent Mo 4.8 Si 3 C 0.6 /MoSi 2 /SiC nanocomposite as a novel anode for LIBs. The composite is prepared through an innovative process involving the introduction of carbon nanotubes (CNTs) by the polymer-derived ceramics (PDC) method. Compared with the traditional physical mixing method, the ceramics derived from single-source-precursors achieve uniform dispersion of CNTs. Meanwhile, Mo 4.8 Si 3 C 0.6 is grown in situ within a SiC matrix. This strategy not only significantly increases the proportion of Mo 4.8 Si 3 C 0.6 within the material, but also ingeniously constructs a SiC framework structure. The designed composite material effectively mitigates the problem of rapid capacity loss due to volume expansion during battery cycling. After this modification, the battery capacity retention rate increases from 45.4% to 80.3%, demonstrating the ability to withstand 3300 ultra-long cycles. This work provides a novel perspective for the design of anode materials for LIBs.
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DOI
高影响因子
MATERIALS CHARACTERIZATION
·
2026
·
IF 6.2
Jun Zhao,Xiang Ji,Peipei Wang,Leihua Xu,Peizhong Feng,Guozheng Lv,Changlin He,Xuanru Ren
A Hf-based borosilicate glass modification strategy is proposed to enhance the oxidation resistance of ZrB 2 -MoSi 2 ceramics. • Moderate HfO 2 addition forms in-situ dense Zr-Hf-Si-O multiphase glass layer, suppressing oxygen inward diffusion. • ZMGH30 sample shows 23.73% lower oxidation weight gain, 70.38% lower average oxidation rate, and 61.17% hardness retention. To address the issues of loose oxide scale and insufficient protective performance in ZrB 2 -MoSi 2 composite ceramics under ultra-high temperature oxidizing environments, caused by the volatilization of B 2 O 3 and the self-depletion of MoSi 2 , A novel Hf-based borosilicate glass modification strategy is proposed by this work. The effects of varying HfO 2 contents on the oxidation resistance and mechanical properties of the ceramics after oxidation at 1700 °C for 100 min were systematically investigated. The results indicate that, with an appropriate amount of HfO 2 modification, a continuous Zr-Hf-Si-O multiphase glass layer forms in situ during oxidation, significantly suppressing the inward diffusion of oxygen. Compared with the unmodified sample, the ZMGH30 sample exhibits a 23.73% reduction in oxidation weight gain, a 70.38% decrease in average oxidation rate, and an increase in hardness retention to 61.17%. Excessive HfO 2 leads to excessively high viscosity of the glass layer, Hf element agglomeration, and dendritic precipitation, thereby weakening the self-healing ability and deteriorating the oxidation resistance. A new approach for developing ultra-high temperature ceramics that combine excellent oxidation resistance and mechanical reliability is provided by this work.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2026
·
IF 6.7
Feng Jiang,Chenchen Li,Xiang Ling
Molybdenum (Mo) is a promising structural material for ultra-high temperature applications, but its catastrophic oxidative degradation remains a critical bottleneck. Conventional single-layer silicide coatings often fail prematurely due to either weak interfacial adhesion (spallation) or insufficient long-term structural stability (cracking). To overcome these limitations, a novel dual-layer composite coating was developed in this study. An inner Mo-Si diffusion layer (∼90 μm) was first fabricated by pack cementation process to ensure robust metallurgical bonding with the Mo substrate. Subsequently, an anti-oxidative outer layer (∼98 μm) containing MoSi 2 , boron and quartz was deposited using slurry sintering technique. Isothermal oxidation tests revealed that the composite coating exhibited excellent protective performance at 1500 °C in air, with only minimal mass loss of 0.178 mg/cm 2 after 9 h. Microstructural analysis demonstrated that bidirectional Si diffusion dynamically transformed the coating into a highly stable gradient structure of SiO 2 -Mo 5 Si 3 -MoSi 2 -Mo 5 Si 3 during high-temperature exposure. The superior oxidation resistance was attributed to a synergistic anti-oxidation mechanism: the inner layer physically anchored the coating to prevent spallation, while the outer layer continuously generated a B 2 O 3 -fluxed fluid borosilicate glass phase that effectively sealed microcracks and pores. This work provides an effective architectural design strategy for developing high-performance oxidation-resistant coatings on refractory metals in ultra-high temperature environments.
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DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 5
·118006
·
IF 6.2
Yulei Sun,Yuzhi Gao,Lianfeng Wu,Zhiyong Wang,Rongguo Wang,Xiaodong He,Fei He,Mingwei Li
High-emissivity coatings are vital for thermal protection systems in hypersonic vehicles, but there is often a conflict between the oxidation behaviors of sintering aids and high-emissivity fillers during the preparation. Here, we propose an in-furnace oxygen partial pressure regulation strategy to fabricate TaSi 2 /MoSi 2 /SiB 4 /borosilicate-glass coatings on the oxidisable substrate of carbon-bonded carbon fiber composites. The oxidation behavior of fillers under various oxygen partial pressures were conducted, and their oxidative characteristics were established. Furthermore, the sintering atmosphere and temperature were optimized to achieve a dense, uniform microstructure. The coatings exhibited an average emissivity of ∼0.94 in the 2.5–8 µm wavelength range, and a total hemispherical emissivity of 0.906 over 2.5–25 µm. After ablation for 1200 s at 1650 ℃, the coatings maintained structural integrity, with a mass ablation rate of 2.25 × 10 −4 g/s, a linear ablation rate of 3.75 × 10 −4 mm/s, which resulted from the formation of porous yet robust Ta 2 O 5 -enriched outer layers.
研究领域:
材料科学
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航空航天工程
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热防护系统
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陶瓷涂层
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高温材料
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DOI
高影响因子
MATERIALS & DESIGN
·
2012
·
IF 2.2
Rujie He,Xinghong Zhang,Wenbo Han,Ping Hu,Changqing Hong
HfB 2 –20 vol.% MoSi 2 ultra high temperature ceramic composites were prepared through aqueous gelcasting route. The stability of HfB 2 and MoSi 2 suspensions were studied by zeta potential measurements, sedimentation tests and apparent viscosity measurements. The solids loading had significant effects on the green and sintered densities, microstructure and mechanical properties of HfB 2 –MoSi 2 composites. The values of flexural strength of the green and sintered bodies ranged from 18.3 to 38.7, and 111.5 to 415.9 MPa, respectively, which were strongly dependent on the solids loading. The values of fracture toughness of the sintered bodies ranged from 2.18 to 4.24 MPa m 1/2 . The highest relative density, mechanical properties and the most homogeneous microstructure was obtained when the solids loading was 45 vol.%. The highest green strength, flexural strength and fracture toughness were 38.7 ± 5.3 MPa, 415.9 ± 17.0 MPa and 4.24 ± 0.22 MPa m 1/2 , respectively.
研究领域:
材料科学
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陶瓷与复合材料
·
机械工程
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DOI
高影响因子
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