JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
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IF 5.8
Yixin Guo,Sijia Huo,Qingyi Kong,Lei Chen,Yujin Wang,Xinghong Zhang,Yu Zhou
Monolithic ZrB 2 , ZrB 2 -SiC, ZrB 2 -TiC and ZrB 2 -SiC-TiC were fabricated by hot pressing. Contour maps depicting grain size and mechanical properties were generated on the ZrB 2 -SiC-TiC ternary diagram through experimental data and software fitting. These visual representations effectively establish the relationships between chemical composition and material properties, despite the similar high hardness of three main compounds. Notably, the average grain size of ZrB 2 -SiC-TiC is significantly reduced by an order of magnitude compared to monolithic ZrB 2 . Both strength and hardness exhibit a strong correlation with grain size, while the elastic modulus demonstrates insensitivity to microstructure changes. The evolution of toughness proves to be complex.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Engineering Materials
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2023
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IF 0
Mengen Hu,Zhulin Huang,Xinyang Li,Yuan Cheng,Zhen Wang,Kewei Li,Tianxu Wang,Xiaoye Hu,Yue Li,Xinghong Zhang
The sol–gel method synergized with a carbothermic reaction has been known to be one of the most promising strategies for preparing a high-quality boride and carbon-based ultrahigh-temperature ceramic, yet their growth mechanism remains underexplored. Herein, high-purity ZrB2 ceramic powders are prepared by a sol–gel method synergized with a subsequent carbothermic reaction. Specifically, sorbitol (C6H14O6) is adopted to build molecularly disperse networks of Zr–O–C–B. Structural characterizations reveal that the calcination temperature and duration have a great influence on the phase and morphological transformation of the precursor. The ZrB2 seeds start to be generated near ZrO2 particles around 1100 °C and grow from the surface to the core of ZrO2 particles with heat and mass transportation around ZrO2 driven by B2O3 at high temperature. Additionally, the ZrB2 powders could research a hardness of 22.5 GPa and a bending strength of 540 MPa after sintering, showing improved mechanical properties. This work reveals the growth mechanism of ultrafine and high-purity ZrB2 powders by a sol–gel method and a carbothermic reaction, which can be used as raw materials to obtain ZrB2 ultrahigh-temperature ceramics with improved mechanical properties.
研究领域:
材料科学
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无机非金属材料
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纳米材料
✓ 已验证
DOI
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2025
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IF 6.2
Kailei Xu,Yumin An,Zanchao Gao,Yehong Cheng,Libin Zhao
A method combining low-temperature demolding with precursor infiltration and pyrolysis (PIP) for preparing C f /SiC-ZrB 2 ceramic composites with bouligand structure is proposed. First, C f /SiC-ZrB 2 -PCS ceramic films were prepared using polycarbosilane (PCS), carbon fiber, and SiC-ZrB 2 ceramic particles through liquid nitrogen demolding technology. Then, C f /SiC-ZrB 2 green body with bouligand structure was achieved by helically assembled and pre-crosslinked C f /SiC-ZrB 2 -PCS ceramic films at a fixed angle. Finally, precursor infiltration and pyrolysis method was employed to densify the C f /SiC-ZrB 2 ceramic composites with bouligand structure using PCS. The mechanical properties of the composites with different carbon fiber contents were investigated, revealing that at a carbon fiber content of 30%, the composites exhibited a flexural strength of 358.9 MPa, a fracture toughness of 10.4 MPa·m 1/2 , and a work of fracture of 2445.4 J·m -2 . The toughening mechanism of C f /SiC-ZrB 2 ceramic composites with bouligand structure was elucidated through two-dimensional crack propagation analysis via scanning electron microscopy (SEM) with three-dimensional fracture network reconstruction using synchrotron X-ray computed tomography (CT).
研究领域:
材料科学
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工程学
✓ 已验证
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
Boren Ke,Ji Zou,Weimin Wang,Wei Ji,Zhengyi Fu
ZrC-SiC-ZrB 2 ceramics were prepared via ultra-high pressure sintering under 15 GPa at 1200 °C. The densification mechanism, microstructures, and properties of the prepared ceramics were investigated. The sintered ceramics with ZrB 2 content of 15 vol % showed the improved comprehensive mechanical properties, including Vickers hardness of 26.6 GPa, Young's modulus of 469.1 GPa, and fracture toughness of 5.0 MPa·m 1/2 , which was 86.7 % higher than that of pure ZrC ceramics. In the sintered sample, the ultra-high pressure induced new microstructure, such as L-C lock in ZrC phase, stacking faults and nanotwins in SiC phase, and severe lattice distortion in ZrB 2 phase, jointly contributed to the improvement in Vickers hardness. Deflection and bridging during crack propagation were ascribed to the uniform combination of various phases.
研究领域:
材料科学
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陶瓷工程
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力学性能
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）