Journal of The European Ceramic Society最新文献

英文中文

Damage-tolerant oxides by imprint of an ultra-high dislocation density 通过超高位错密度印记实现耐损伤氧化物

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-03 DOI: 10.1016/j.jeurceramsoc.2024.116969

Oliver Preuß , Enrico Bruder , Jiawen Zhang , Wenjun Lu , Jürgen Rödel , Xufei Fang

Dislocations in ductile ceramics offer the potential for robust mechanical performance while unlocking versatile functional properties. Previous studies have been limited by small volumes with dislocations and/or low dislocation densities in ceramics. Here, we use Brinell ball scratching to create crack-free, large plastic zones, offering a simple and effective method for dislocation engineering at room temperature. Using MgO, we tailor high dislocation densities up to ∼10¹⁵ m⁻². We characterise the plastic zones by chemical etching, electron channelling contrast imaging, and scanning transmission electron microscopy, and further demonstrate that crack initiation and propagation in the plastic zones with high-density dislocations can be completely suppressed. The residual stresses in the plastic zones were analysed using high-resolution electron backscatter diffraction. With the residual stress being subsequently relieved via thermal annealing while retaining the high-density dislocations, we observe the cracks are no longer completely suppressed, but the pure toughening effect of the dislocations remains evident.

韧性陶瓷中的位错可提供强大的机械性能，同时释放出多种功能特性。以往的研究受到陶瓷中位错体积小和/或位错密度低的限制。在这里，我们使用布氏球划痕来创建无裂纹的大塑性区，为室温下的位错工程提供了一种简单而有效的方法。利用氧化镁，我们定制了高达 ∼1015 m-2 的高位错密度。我们通过化学蚀刻、电子通道对比成像和扫描透射电子显微镜分析了塑性区的特征，并进一步证明了在具有高密度位错的塑性区中，裂纹的产生和扩展可以被完全抑制。利用高分辨率电子反向散射衍射分析了塑性区的残余应力。在保留高密度位错的同时，通过热退火释放残余应力，我们发现裂纹不再被完全抑制，但位错的纯增韧效应依然明显。

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引用次数: 0

Understanding the lower fracture resistance of cold sintered ceramics 了解冷烧结陶瓷较低的抗断裂性

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-03 DOI: 10.1016/j.jeurceramsoc.2024.116968

Abdullah Jabr , Elija Ribul , David Salamon , Raul Bermejo

The cold sintering process (CSP) enables densification of ceramics at unprecedented low temperatures, unlocking unique opportunities in microstructural design. However, the mechanical behaviour of cold sintered ceramics remains unexplored. This study aims to compare the mechanical strength and fracture resistance of cold sintered (140°C) with conventionally sintered (1000°C) ZnO. The effect of grain size is investigated in samples sintered using conventional, cold and rapid sintering. It was found that cold sintered ZnO exhibits ∼50 % lower strength compared to conventionally sintered parts (∼120 vs. ∼240 MPa). This is explained by the lower fracture toughness of the former (0.57 vs. 1.15 MPa·m^1/2), resulting from a grain size effect that favours intergranular fracture along nanometric grains. This grain size effect is supported by the higher hardness measured on cold vs. conventionally sintered ZnO (4.5 vs. 1.8 GPa). The lower toughness of cold sintered ceramics is demonstrated to be related to their nanocrystalline nature.

冷烧结工艺（CSP）能使陶瓷在前所未有的低温下致密化，为微结构设计带来了独特的机遇。然而，冷烧结陶瓷的机械性能仍有待探索。本研究旨在比较冷烧结（140°C）和传统烧结（1000°C）氧化锌的机械强度和抗断裂性。研究了传统烧结、冷烧结和快速烧结样品中晶粒大小的影响。研究发现，冷烧结氧化锌的强度比传统烧结零件低 50%（120 兆帕比 240 兆帕）。这是因为前者的断裂韧性较低（0.57 vs. 1.15 MPa-m1/2），这是晶粒尺寸效应造成的，有利于沿纳米晶粒发生晶间断裂。冷烧结 ZnO 与传统烧结 ZnO 相比测得的硬度更高（4.5 GPa 对 1.8 GPa），这也证明了晶粒尺寸效应。冷烧结陶瓷的韧性较低与它们的纳米结晶性质有关。

引用次数: 0

Influence of water vapor partial pressure on self-healing and oxidation of SiC-dispersed yttrium silicate composites 水蒸气分压对碳化硅分散硅酸钇复合材料自愈合和氧化的影响

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-03 DOI: 10.1016/j.jeurceramsoc.2024.116967

Huong Thi Nguyen , Yen-Ling Kuo , Makoto Nanko

The self-healing and oxidation behavior of SiC-dispersed Y₂Si₂O₇-Y₂SiO₅ composites were elucidated under various water vapor partial pressures

P_{H_{2} O}

. Samples were exposed in a furnace for self-healing experiments at 1100–1300°C and for high-temperature oxidation at 1200–1400°C, both for 1–24 h, under

P_{H_{2} O}

ranging from 2×10⁴ to 5×10⁴ Pa, while keeping

P_{O_{2}}

constant at 2×10⁴ Pa. Water vapor promoted the self-healing effectiveness of the composites. A mechanism contributing to the closure of surface cracks was consistent with volume expansion derived from the oxidative conversion of SiC into SiO₂ and the outward diffusion of yttrium cations. The formation of the internally oxidized zone signifies oxidation behavior, resulting from the inward diffusion of oxygen ions. Growth of the internally oxidized zone obeys the parabolic pattern. The influence of

P_{H_{2} O}

on the high-temperature oxidation of SiC/Y₂Si₂O₇-Y₂SiO₅ is discussed in this study.

在不同的水蒸气分压 PH2O 下，阐明了 SiC 分散 Y2Si2O7-Y2SiO5 复合材料的自愈合和氧化行为。在 PH2O 为 2×104 至 5×104 Pa 的条件下，将样品置于熔炉中，在 1100-1300°C 下进行自愈合实验，并在 1200-1400°C 下进行高温氧化实验，时间均为 1-24 h，同时将 PO2 保持在 2×104 Pa。导致表面裂缝闭合的机制与碳化硅氧化转化为二氧化硅和钇阳离子向外扩散所产生的体积膨胀一致。内部氧化区的形成标志着氧化行为，是氧离子向内扩散的结果。内部氧化区的生长遵循抛物线模式。本研究讨论了 PH2O 对 SiC/Y2Si2O7-Y2SiO5 高温氧化的影响。

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引用次数: 0

Synthesis of two new o-MAX phases Mo2VAlC2 and Mo2V2AlC3 and their derivatives o-MXene Mo2VC2Tx and Mo2V2C3Tx 合成两种新的 o-MAX 相 Mo2VAlC2 和 Mo2V2AlC3 及其衍生物 o-MXene Mo2VC2Tx 和 Mo2V2C3Tx

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-03 DOI: 10.1016/j.jeurceramsoc.2024.116964

Bo Wen , Yijiang Liu , Lei Cao , Xingyuan San , Yanchun Zhou , Man Jiang , Longsheng Chu , Qingguo Feng , Chunfeng Hu

The out-of-plane ordered structure endows the o-MAX phase with more excellent properties and the derivative o-MXene with more promising applications. However, too few types of o-MAX and o-MXene have been synthesized for studying, significantly limiting their promising applications. In this work, two new high-purity o-MAX phases, Mo₂VAlC₂ and Mo₂V₂AlC₃, were successfully synthesized using an solid-phase reaction method and their ordered structures were demonstrated. The lattice parameters, X-ray diffraction data, and microstructure of these two o-MAX phases were clearly determined. Meanwhile, two new o-MXene, Mo₂VC₂T_x and Mo₂V₂C₃T_x, were also obtained by etching the o-MAX powders in HF solution, which would expand their further interesting researches.

平面外有序结构赋予了 o-MAX 相更优异的性能，其衍生物 o-MXene 也具有更广阔的应用前景。然而，可供研究的 o-MAX 和 o-MXene 类型太少，大大限制了它们的应用前景。本研究采用固相反应法成功合成了 Mo2VAlC2 和 Mo2V2AlC3 两种新的高纯度 o-MAX 相，并展示了它们的有序结构。这两种 o-MAX 相的晶格参数、X 射线衍射数据和显微结构均已明确测定。同时，通过在 HF 溶液中蚀刻 o-MAX 粉末，还得到了 Mo2VC2Tx 和 Mo2V2C3Tx 两种新的 o-MXene，这将拓展其进一步的研究兴趣。

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引用次数: 0

Production of complex microchanneled parts of ZrB2-MoSi2 ultra-high temperature ceramics by freeze casting and pressureless spark plasma sintering 通过冷冻铸造和无压火花等离子烧结生产 ZrB2-MoSi2 超高温陶瓷的复杂微通道部件

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-03 DOI: 10.1016/j.jeurceramsoc.2024.116966

Álvaro Sández-Gómez, Angel L. Ortiz, Pedro Miranda

A novel approach for manufacturing complex parts of ultra-high-temperature ceramics (UHTCs) is proposed, combining freeze casting with pressureless spark plasma sintering (SPS). With the aid of MoSi₂ sintering additive (15 vol% or more), this combination enables the production of fully dense ZrB₂-based UHTC parts at 1900 °C. Producing complex-shaped samples including an intricate network of internal microchannels seems feasible, by using additive manufacturing techniques in the production of templates for the external silicone mould and the internal microchannel network to be used during the freeze casting process. Although defects are prone to occur either during freeze drying, due to thermal stresses arising from the expansion mismatch between the internal resin template and the ceramic preform, or during the resin burn-out or SPS cycles, the resulting samples exhibited a fully dense microstructure and similar hardness (17 ± 1 GPa) as the bulk material. Thus, the proposed approach shows promise in the production of arbitrarily complex-shaped UHTC parts that may find application in numerous industrial sectors including aerospace, aviation, and energy generation and storage.

本文提出了一种制造超高温陶瓷（UHTC）复杂部件的新方法，将冷冻铸造与无压火花等离子烧结（SPS）相结合。借助 MoSi2 烧结添加剂（15 Vol% 或更高），这种组合能在 1900 °C 下生产出完全致密的 ZrB2 基超高温陶瓷部件。通过使用增材制造技术生产外部硅胶模具模板和内部微通道网络模板，在冷冻铸造过程中使用这些模板，生产包括复杂的内部微通道网络在内的复杂形状样品似乎是可行的。虽然在冷冻干燥过程中，由于内部树脂模板和陶瓷预型件之间的膨胀不匹配所产生的热应力，或在树脂烧尽或 SPS 循环过程中，容易出现缺陷，但所得到的样品显示出完全致密的微观结构和与块状材料相似的硬度（17 ± 1 GPa）。因此，所提出的方法有望生产出任意复杂形状的超高真空陶瓷部件，这些部件可应用于众多工业领域，包括航天、航空以及能源生产和储存。

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引用次数: 0

Insights into pressure-driven depolarization in PLZST-based antiferroelectric ceramics 透视基于 PLZST 的反铁电陶瓷中的压力驱动去极化现象

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-02 DOI: 10.1016/j.jeurceramsoc.2024.116954

Anil Adukkadan, Deepak Sharma , Gudeta Jafo Muleta , Rajeev Ranjan

Materials showing field-driven antiferroelectric to ferroelectric transformation are interesting for the design of pyroelectric, high strain actuator and high-power dielectric energy storage and discharge devices. The stability of the antiferroelectric and ferroelectric states at room temperature can be chemically tuned by La and Ti co-modification of the antiferroelectric system Pb(Zr_1-ySn_y)O₃. Here, we have chosen a composition Pb_0.982La_0.012(Zr_0.60Sn_0.30Ti_0.10)O₃ (PLZST) at the threshold of the antiferroelectric-ferroelectric instability at room temperature and investigated the effect of electric field, temperature and pressure on the stability of the structural-polar states. We show that electric poling transforms irreversibly the antiferroelectric state into a ferroelectric state. Application of hydrostatic pressure ∼100 MPa on the field-stabilized ferroelectric phase, however, restores the antiferroelectric state and depolarizes the system.

显示场驱动的反铁电到铁电转变的材料对于设计热释电、高应变致动器和大功率介电储能和放电设备很有意义。反铁电体系 Pb（Zr1-ySny）O3 在室温下的反铁电态和铁电态的稳定性可以通过 La 和 Ti 共修饰进行化学调整。在这里，我们选择了室温下处于反铁电-铁电不稳定临界点的 Pb0.982La0.012(Zr0.60Sn0.30Ti0.10)O3（PLZST）成分，并研究了电场、温度和压力对结构极性态稳定性的影响。我们的研究表明，电极化将反铁电态不可逆地转变为铁电态。然而，对场稳定的铁电相施加 ∼100 兆帕的静水压力会恢复反铁电态并使系统去极化。

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引用次数: 0

Compositionally complex AlB2-type diborides in dissociated air plasma 离析空气等离子体中成分复杂的 AlB2-型二硼化物

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-02 DOI: 10.1016/j.jeurceramsoc.2024.116963

F. Monteverde , C. Pellegrini , M. Balat-Pichelin , W. Fahrenholtz , G. Hilmas

Multi-metal compositionally complex (CC) AlB₂-type diboride solid solutions (SS) containing IV-V-VI group elements are garnering a steadily growing research interest. The present work explores the composition dependence of oxidation resistance on nominally equiatomic (Hf,Me,Ta,Ti,Zr)B₂ SS, Me = Nb or Cr, exposed to a dissociated air plasma (total pressure of about 1 kPa): specimens were exposed for 5 min at some selected set points between 1800 K and 2500 K using a solar furnace. The CC diboride with Nb showed superior resistance to oxidation compared to that with Cr. The experimental results showed good agreement with predictions based on a thermodynamic assessment.

含有 IV-V-VI 族元素的多金属成分复杂 (CC) AlB2 型二硼化物固溶体（SS）正在引起越来越多的研究兴趣。本研究探讨了名义等原子（Hf,Me,Ta,Ti,Zr）B2 SS（Me = Nb 或 Cr）暴露于离析空气等离子体（总压力约为 1 kPa）中的抗氧化性成分依赖性：使用太阳炉在 1800 K 和 2500 K 之间的某些选定设定点对试样进行 5 分钟的暴露。与含铬的二硼化铬镍钴合金相比，含铌的二硼化铬镍钴合金具有更强的抗氧化性。实验结果与基于热力学评估的预测结果十分吻合。

引用次数: 0

Flash sintering enhanced co-doping TiO2 with Fe and Cu to improve photocatalytic efficiency 闪速烧结增强 TiO2 与 Fe 和 Cu 的共掺杂以提高光催化效率

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-10-01 DOI: 10.1016/j.jeurceramsoc.2024.116960

Anupam Raj , Adit Thampi , Bhavesh N. Socha , Shikhar Krishn Jha

Nanoparticles of TiO₂ doped with a transition metal are known to be effective photocatalysts. Fe and Cu co-doping in TiO₂ using flash sintering and its enhanced photodegradation efficiency for methylene blue (MB) are discussed here. The properties of synthesized material have been evaluated using various characterization techniques, including XRD, TEM, SEM, BET, XPS, FT-IR, and UV–visible spectroscopy. The XRD confirmed complete co-doping by using flash sintering, which was also corroborated by TEM. XPS analysis showed that the flash sintered catalyst had more defects like Ti³⁺ and oxygen vacancies than the conventionally sintered catalyst. UV-Vis spectroscopy and dye degradation experiments showed that co-doping in TiO₂ with Fe and Cu narrowed the band gap, which in turn boosted its visible light sensitivity by enhancing the trapping rate of photogenerated electrons and holes. Tested on MB, flash sintered co-doped TiO₂ showed a higher degradation efficiency under the visible range of LED white light.

众所周知，掺杂过渡金属的二氧化钛纳米颗粒是一种有效的光催化剂。本文讨论了利用闪速烧结法在二氧化钛中共同掺杂铁和铜及其对亚甲基蓝（MB）光降解效率的提高。利用各种表征技术，包括 XRD、TEM、SEM、BET、XPS、傅立叶变换红外光谱和紫外可见光谱，对合成材料的性能进行了评估。XRD 证实了通过闪速烧结实现的完全共掺杂，TEM 也证实了这一点。XPS 分析表明，与传统烧结催化剂相比，闪速烧结催化剂具有更多的 Ti3+ 和氧空位等缺陷。紫外可见光谱和染料降解实验表明，TiO2 中铁和铜的共掺杂缩小了带隙，进而通过提高光生电子和空穴的捕获率提高了其可见光灵敏度。在甲基溴的测试中，闪蒸烧结的共掺杂 TiO2 在 LED 白光的可见光范围内显示出更高的降解效率。

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引用次数: 0

Towards lower annealing temperatures and enhanced functional properties in aerosol-deposited piezoelectric thick films: A study of the effect of Li additive on BaTiO3 films 降低气溶胶沉积压电厚膜的退火温度并增强其功能特性：锂添加剂对 BaTiO3 薄膜影响的研究

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-09-30 DOI: 10.1016/j.jeurceramsoc.2024.116962

Anass Chrir , Oscar Rojas , Maggy Colas , Laurence Boyer , Olivier Durand , Pascal Marchet

The effect of incorporating Li additive (Li₂CO₃) into aerosol deposited BaTiO₃ thick films was investigated. The addition of Li₂CO₃ to the deposited powder facilitated grain growth during post deposition process, even for low annealing temperatures (≤ 700 °C). Therefore, this additive decreased the threshold for ferro/piezoelectricity recovery from 800 °C to 650 °C. Furthermore, annealing at temperatures ≥ 800 °C yielded grain sizes ranging from 100 nm to 700 nm, unprecedented in our previous investigations. Substantially improved ferroelectric and piezoelectric responses were obtained in the 800–900 °C range, with P_r values doubling to 12 µA.cm⁻² for films annealed at 900 °C. Moreover, the use of this additive improved leakage behavior, achieving a leakage current density of 0.1 µA.cm⁻² and an electrical resistivity of 10¹¹ Ω.cm at 700 °C. Microscopic analyses revealed a carbon containing secondary phase at grain boundaries, probably corresponding to Li₂CO₃.

研究了在气溶胶沉积的 BaTiO3 厚膜中加入锂添加剂（Li2CO3）的效果。在沉积粉末中添加 Li2CO3 有助于后沉积过程中的晶粒生长，即使退火温度较低（≤ 700 °C）也是如此。因此，这种添加剂将铁电/压电恢复的阈值从 800 °C 降至 650 °C。此外，在温度≥ 800 °C 的退火条件下，晶粒大小从 100 nm 到 700 nm 不等，这在我们之前的研究中是前所未有的。在 800-900 °C 范围内，铁电和压电响应得到了显著改善，在 900 °C 下退火的薄膜的 Pr 值增加了一倍，达到 12 µA.cm-2。此外，使用这种添加剂还改善了漏电行为，在 700 °C 时漏电电流密度达到 0.1 µA.cm-2，电阻率达到 1011 Ω.cm。显微分析表明，在晶界处有一种含碳的次生相，可能与 Li2CO3 相对应。

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引用次数: 0

The interface mechanical and ablative evolution behaviors under different heat flux of multiphase HfC-SiC matrix composites 不同热通量下多相 HfC-SiC 基复合材料的界面力学和烧蚀演化行为

IF 5.8 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society

Pub Date : 2024-09-30 DOI: 10.1016/j.jeurceramsoc.2024.116958

Xinhao Shi , Liping Wang , Wanbo Hou , Jiahui Ding , Tao Feng , Hongjiao Lin , Mingde Tong

Multiphase HfC-SiC ceramic matrix composites were prepared by a combination process. The interface mechanics and ablation properties behaviors were investigated. Introducing the PyC-SiC interface, the composites showed a second-order pull-out mechanism. The mechanical failure model showed that fibers and matrix have different failure strain under load depending on the component that fails first. Moreover, the ablative airflow in the center area will spread to the edge area through the thermal shock microcracks generated. Increasing of the heat flux, the crack width gradually increased to be ditches. It accelerated the evolution of surface morphology, which showed HfC-SiC substrate was first transformed into Hf-Si-O solid solution on the process of phase transformation of oxidation products from 1680 ℃ to 2150 ℃, and eventually sintered into HfO₂. The change in the morphology of oxidation product consumed more heat and protected the substrate from oxidation, resulting in improving the ablation resistance of composites.

采用组合工艺制备了多相 HfC-SiC 陶瓷基复合材料。研究了界面力学和烧蚀特性行为。通过引入 PyC-SiC 界面，复合材料显示出二阶拉拔机制。力学失效模型显示，纤维和基体在载荷作用下的失效应变因先失效的组分而异。此外，中心区域的烧蚀气流会通过产生的热冲击微裂缝扩散到边缘区域。随着热通量的增加，裂纹宽度逐渐增大，形成沟状。这加速了表面形貌的演变，表明 HfC-SiC 衬底在 1680 ℃ 至 2150 ℃ 的氧化产物相变过程中首先转化为 Hf-Si-O 固溶体，最终烧结为 HfO2。氧化产物形态的改变消耗了更多的热量，保护了基底免受氧化，从而提高了复合材料的抗烧蚀性。

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引用次数: 0

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