Ceramics International最新文献_第5页

New phase-construction phosphors ceramics for warm-white solid-state lighting: Orange-yellow-emitting (Lu,Gd)3(Sc,Al)5O12: Ce3+ 用于暖白固态照明的新型相构荧光粉陶瓷：橙黄色发光(Lu,Gd)3(Sc,Al)5O12：Ce3+

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.309

Yuelong Ma , Zezhong Yang , Yimo Zhao , Xingyu Qi , Shisheng Lin , Lan Wu , Lingwei Zeng , Lili Lu , Zongcai Wang , Xingzhou Chen , Guoxing Jiang , Dengjie Zhu , Daqin Chen

Phosphor-converted white light-emitting diodes (pc-wLEDs) and phosphor-converted white laser diodes (pc-wLDs) are extensively utilized in lighting applications, with their quality and reliability heavily dependent on color converters. Recent progress in all-inorganic color converters, particularly phosphor ceramics (PCs), have markedly enhanced performance. However, due to the difficulty of managing emissive components, achieving warm white light with substantial red emission still remains challenging. In this work, a series of pure-phase Ce³⁺-activated garnet-structured solid-solution PCs, (Lu,Gd)₃(Sc,Al)₅O₁₂: Ce (LGSAG: Ce), were fabricated using vacuum sintering technology for the first time. Through systematic analysis, it can be revealed that the addition of Gd³⁺ leads to a red shift in emission through changes in crystal-field splitting, whereas the inclusion of Sc³⁺ primarily focuses on improving the microstructure of the developed PCs. Particularly, the pc-wLED constructed from typical LGSAG: Ce PC generated significantly warmer light with a correlated color temperature (CCT) of 2916 K, compared to the 9557 K from LuAG: Ce PC. Meanwhile, under 40.0 W (15.7 W/mm²) blue laser excitation, the maximum luminous flux and luminescence efficiency of one typical LGSAG: Ce PG are 1172 lm and 29.3 lm/W, respectively. Therefore, the developed LGSAG: Ce PCs can show notable potential as color converters for future high-power warm-white solid-state lighting applications.

荧光粉转换白光发光二极管（pc-wLED）和荧光粉转换白光激光二极管（pc-wLD）广泛应用于照明领域，其质量和可靠性在很大程度上取决于色彩转换器。无机色彩转换器，特别是荧光粉陶瓷（PC）的最新进展显著提高了其性能。然而，由于难以管理发射元件，实现暖白光和大量红色发射仍然具有挑战性。在这项工作中，首次利用真空烧结技术制造了一系列纯相 Ce3+ 激活石榴石结构固溶体 PC，即 (Lu,Gd)3(Sc,Al)5O12：Ce（LGSAG：Ce）。通过系统分析，可以发现 Gd3+ 的加入会通过改变晶场分裂而导致发射红移，而 Sc3+ 的加入则主要侧重于改善所制备 PC 的微观结构。特别是，用典型的 LGSAG: Ce PC 制成的 pc-wLED 发出的光明显较暖，相关色温（CCT）为 2916 K，而 LuAG: Ce PC 的相关色温（CCT）为 9557 K。同时，在 40.0 W（15.7 W/mm2）蓝色激光激发下，一个典型 LGSAG: Ce PG 的最大光通量和发光效率分别为 1172 lm 和 29.3 lm/W。因此，所开发的 LGSAG: Ce PC 在未来大功率暖白固态照明应用中作为色彩转换器具有显著的潜力。

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引用次数: 0

TiO2-doping boosting resource utilization of high-manganese electrolytic manganese residue for superior performance glass-ceramics 掺杂 TiO2 提高高锰电解锰渣的资源利用率，以生产高性能玻璃陶瓷

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.333

Ling Wang , Weiwen Zhou , Xiaofeng Lin , Yulei Xie

The technology for the resourceful utilization of electrolytic manganese residue (EMR) in the production of superior performance glass-ceramics has garnered significant interest for its potential to maximize the consumption of waste residues in the Mn metal industry. In this study, utilizing the unique chemical composition of high-Mn EMR, superior performance glass-ceramics were prepared via a melting method, with TiO₂ utilized as a nucleating agent. The influence of the TiO₂ doping amount on the crystalline characteristics, microstructure and properties of the glass-ceramics were systematically evaluated. Additionally, the curing mechanism of Mn in glass-ceramics was scrutinized. The results show that TiO₂ enhances the precipitation of Ca(Ti,Mg,Al) (Si,Al)₂O₆ predominant crystalline phase in the glass-ceramics. This phase transitions from a spherical to an interlocking and dense dendritic morphology. The glass-ceramics containing 10 wt% TiO₂, which was heat-treated by nucleation at 750 °C for 2 h followed by crystallization at 900 °C for 3 h, exhibits enhanced mechanical properties and chemical stability. Its bending strength exceeds 40 MPa, with a water absorption of 0.11 %. Additionally, the acid resistance of glass-ceramics is rated at higher than 97 %, while the alkali resistance is over 99.7 %. Notably, the superior performance in Mn leaching toxicity is achieved in T10 (1.39 mg/L), which is attributable to the fact that Mn is physically coating between the crystalline and glassy phases. This technology has the potential to address the issue of heavy metal release from EMR, and provides a theoretical foundation for the industrial production path of glass-ceramics from high-Mn EMR.

资源化利用电解锰残渣（EMR）生产高性能玻璃陶瓷的技术因其可最大限度地利用锰金属工业废渣的潜力而备受关注。本研究利用高锰 EMR 的独特化学成分，通过熔融法制备了高性能玻璃陶瓷，并使用 TiO2 作为成核剂。研究系统地评估了 TiO2 掺杂量对玻璃陶瓷的结晶特性、微观结构和性能的影响。此外，还仔细研究了玻璃陶瓷中 Mn 的固化机理。结果表明，二氧化钛会促进玻璃陶瓷中主要结晶相 Ca(Ti,Mg,Al) (Si,Al)2O6 的沉淀。这种相从球形转变为交错致密的树枝状形态。含 10 wt% TiO2 的玻璃陶瓷在 750 °C 下成核 2 小时，然后在 900 °C 下结晶 3 小时后进行热处理，其机械性能和化学稳定性均有所提高。其弯曲强度超过 40 兆帕，吸水率为 0.11%。此外，玻璃陶瓷的耐酸性超过 97%，耐碱性超过 99.7%。值得注意的是，T10（1.39 毫克/升）在锰浸出毒性方面表现出色，这归因于锰在晶体和玻璃相之间的物理包覆。该技术有望解决电磁辐射重金属释放问题，并为高锰电磁辐射玻璃陶瓷的工业化生产提供了理论基础。

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引用次数: 0

Sensing-performance improvement of 2D MoSH based gas sensors for detecting NO, NO2, and NH3 gas molecules 基于二维 MoSH 的气体传感器在检测 NO、NO2 和 NH3 气体分子方面的传感性能改进

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.313

Wensheng Zhou , Guogang Liu , Tong Chen , Cheng Luo , Danfeng Qin , Xianbo Xiao

Nitrogen group oxide is one of the major pollutants in the air, and its accurate and rapid detection is essential for environmental protection and human health. Therefore, it is of great significance to develop high-performance new line sensor for Nitrogen group oxide. Here, we investigate the potential of monolayer 2D MoSH materials as candidates for NO gas sensing using a combination of density functional theory and non-equilibrium functions to construct nanodevices based on MoSH monolayer, and theoretically study the adsorption behavior of MoSH monolayer to NO, NO₂, and NH₃ gas molecules. The results indicate that MoSH monolayer exhibit metallicity, and nanodevices based on 2D MoSH monolayer exhibit anisotropic transport properties and significant negative differential resistance effects(NDR). More interestingly, gas sensors based on MoSH monolayers exhibit typical chemical adsorption of NO, NO₂, and NH₃ gas molecules, and the anisotropic transport properties still maintain, but significant differences of sensitivity appear for these three gas molecules. Specifically, the MoSH based gas sensor has the highest sensitivity to NO, reaching 93.1 % and 76.3 % along the armchair and zigzag directions, respectively. These results show that 2D MoSH monolayer is an excellent gas-sensing material with excellent application prospects for NO gas detection.

氮氧化物是空气中的主要污染物之一，准确、快速地检测氮氧化物对环境保护和人类健康至关重要。因此，开发高性能的新型氮氧化物线性传感器具有重要意义。在此，我们研究了单层二维 MoSH 材料作为氮氧化物气体传感候选材料的潜力，采用密度泛函理论和非平衡函数相结合的方法构建了基于 MoSH 单层的纳米器件，并从理论上研究了 MoSH 单层对 NO、NO2 和 NH3 气体分子的吸附行为。结果表明，MoSH 单层具有金属性，基于二维 MoSH 单层的纳米器件具有各向异性的传输特性和显著的负微分电阻效应（NDR）。更有趣的是，基于 MoSH 单层的气体传感器对 NO、NO2 和 NH3 气体分子表现出典型的化学吸附，各向异性传输特性依然保持，但对这三种气体分子的灵敏度出现了显著差异。具体来说，基于 MoSH 的气体传感器对 NO 的灵敏度最高，沿扶手和之字形方向分别达到 93.1% 和 76.3%。这些结果表明，二维 MoSH 单层是一种优秀的气体传感材料，在氮氧化物气体检测方面具有良好的应用前景。

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引用次数: 0

Research on high-entropy spinel microwave absorption materials: Exploration of machine learning and experimental integration 高熵尖晶石微波吸收材料研究：机器学习与实验整合的探索

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.335

Pengyu Liu , Zhenming Cui , Yan Sun , Wenpei Yuan , Lin Qu , XiaoMing Wang , Yanlan Zhang , YongZhen Wang

With the advancement of electronic communication technology, the intensity of electromagnetic radiation is increasing, and traditional wave-absorbing materials no longer meet the demands in various current environments. Spinel ferrite is one of the earliest materials used for absorbing electromagnetic waves, and the introduction of "high entropy" and controlling the degree of entropy disorder can achieve performance regulation. Nonetheless, the lengthy testing period and high costs associated with trial and error have posed challenges, limiting the development of high entropy microwave absorbing materials. This study utilized machine learning techniques to construct a high-entropy spinel microwave absorption property database. The design of Co_xNi_0.4-xCu_0.2Zn_0.2Mn_0.2Fe₂O₄ (X = 0, 0.1, 0.2, 0.3, 0.4) was informed by the SHAP plots of the GBR model. Machine learning demonstrates that factors such as cobalt and nickel content, particle size, and others significantly influence microwave absorption performance. The experimental result manifests it and Co content regulate the microwave absorbing performance through adjusting the defect density and particle size. The Co_xNi_0.4-xCu_0.2Zn_0.2Mn_0.2Fe₂O₄ with optimized Co content achieved a reflection loss (RL) of −45.32 dB, and an effective absorption bandwidth (EAB) of 6.48 GHz. This approach significantly reduced the research period, presented a novel research methodology for other scholars, and expedited the research progress in the field of microwave absorbing materials.

随着电子通信技术的发展，电磁辐射强度不断增加，传统的吸波材料已不能满足当前各种环境的需求。尖晶石铁氧体是最早用于吸收电磁波的材料之一，引入 "高熵 "并控制熵的无序程度可以实现性能调节。然而，试验周期长、试错成本高，限制了高熵微波吸收材料的发展。本研究利用机器学习技术构建了高熵尖晶石微波吸收特性数据库。CoxNi0.4-xCu0.2Zn0.2Mn0.2Fe2O4（X = 0、0.1、0.2、0.3、0.4）的设计参考了 GBR 模型的 SHAP 图。机器学习证明，钴和镍含量、粒度等因素对微波吸收性能有显著影响。实验结果表明，钴和镍含量通过调整缺陷密度和粒度调节微波吸收性能。优化 Co 含量的 CoxNi0.4-xCu0.2Zn0.2Mn0.2Fe2O4 的反射损耗（RL）为 -45.32 dB，有效吸收带宽（EAB）为 6.48 GHz。这种方法大大缩短了研究周期，为其他学者提供了一种新颖的研究方法，加快了微波吸收材料领域的研究进展。

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引用次数: 0

Tailoring the additional content of short carbon fiber in the reduced graphene oxide-Cu self-lubricating composites for enhanced mechanical and tribological performance 调整还原氧化石墨烯-铜自润滑复合材料中短碳纤维的额外含量以提高机械和摩擦学性能

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.324

Ming Yang , Xinjiang Zhang , Cailiu Yin, Jianlie Liang, Chengcheng Peng, Chunqiang Yi, Guosheng Chen, Wenbo Zhu

The reduced graphene oxide-Cu self-lubricating composites with short carbon fiber fillers were fabricated by powders wet-mixing combined with hot-pressed sintering process. The impacts of short carbon fiber content on microstructure, mechanical and tribological performance of reduced graphene oxide-Cu composites were characterized. The reduced graphene oxide/carbon fiber hybrid fillers were randomly distributed in the sintered bulk compacts. The hybrid filled composites achieved enhancement in mechanical and tribological properties. With increasing carbon fiber content, hardness and compressive yield strength of the prepared composites were increased, and both friction coefficient and wear rate showed a constant decrease trend under different loads. Owing to the synergy effect of reduced graphene oxide/carbon fiber hybrid lubricant fillers during sliding together with the greatly enhanced hardness and yield strength, up to 0.6 wt% carbon fiber incorporation resulted a lowest friction coefficient and decreased wear rate. Randomly distributed reduced graphene oxide/carbon fiber hybrid fillers provided the lubrication to reduce friction and wear for Cu matrix.

通过粉末湿法混合结合热压烧结工艺，制备了含有短碳纤维填料的还原氧化石墨烯-铜自润滑复合材料。研究了短碳纤维含量对还原氧化石墨烯-铜复合材料微观结构、力学和摩擦学性能的影响。还原氧化石墨烯/碳纤维混合填料随机分布在烧结的块状致密材料中。混合填料复合材料的机械性能和摩擦学性能都得到了提高。随着碳纤维含量的增加，所制备复合材料的硬度和抗压屈服强度均有所提高，而摩擦系数和磨损率在不同载荷下均呈持续下降趋势。由于还原氧化石墨烯/碳纤维混合润滑填料在滑动过程中的协同效应，以及硬度和屈服强度的大幅提高，碳纤维含量达到 0.6 wt%时，摩擦系数最低，磨损率降低。随机分布的还原氧化石墨烯/碳纤维混合填料为铜基体提供了润滑，从而降低了摩擦和磨损。

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引用次数: 0

In-situ synthesis of synergistic ZnMn2O4/MnOOH nanocomposite as a cutting-edge pseudocapacitive electrode material for all-solid-state asymmetric supercapacitors 原位合成协同作用的 ZnMn2O4/MnOOH 纳米复合材料，作为全固态不对称超级电容器的尖端伪电容电极材料

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.326

Yu Zhao , K. Sunil Kumar , Mohamed A. Ghanem , Nipa Roy , Jong Su Kim , Sang Woo Joo

Currently, there has been a growing interest in constructing metal oxide composite structures through the in-situ synthesis method, especially for fabricating electrode materials for supercapacitors. This approach offers several advantages, such as improved contact between different materials, enhanced conductivity, efficient ion diffusion, and better overall electrochemical performance. This work investigates the synthesis of zinc manganese oxide and manganese oxyhydroxide (ZnMn₂O₄/MnOOH) composite using a solvothermal method. The structure, surface morphology, and composition of the ZnMn₂O₄/MnOOH composite were elucidated using standard physicochemical characterization techniques where the presence of ZnMn₂O₄ and MnOOH phases was confirmed and the ZnMn₂O₄/MnOOH nanocomposite behaved as a pseudocapacitive electrode with a notable specific capacitance of 1039.2 F g⁻¹ at a current density of 1 A g⁻¹. When subjected to a 10-fold increase in current density, the ZnMn₂O₄/MnOOH electrode maintained 50 % of its initial capacity, registering 513.4 F g⁻¹. Additionally, the electrode showcased excellent cyclic stability, preserving 95 % of its initial capacity after 5000 cycles at 10 A g⁻¹. Moreover, the constructed ZnMn₂O₄/MnOOH//activated carbon (AC) asymmetric supercapacitor (ASC) device attained a high energy density of 29.45 Wh kg⁻¹ at a power density of 1384.5 W kg⁻¹. The results confirm that the ZnMn₂O₄/MnOOH composite, prepared in a single synthesis step, shows great potential as a phenomenal pseudocapacitive electrode for energy storage applications.

目前，人们越来越关注通过原位合成法构建金属氧化物复合结构，尤其是用于制造超级电容器的电极材料。这种方法具有多种优势，如改善不同材料之间的接触、增强导电性、高效离子扩散和更好的整体电化学性能。本研究采用溶热法合成了氧化锰锌和氢氧化锰（ZnMn2O4/MnOOH）复合材料。采用标准的物理化学表征技术阐明了 ZnMn2O4/MnOOH 复合材料的结构、表面形貌和成分，证实了 ZnMn2O4 和 MnOOH 相的存在，ZnMn2O4/MnOOH 纳米复合材料表现为伪电容电极，在电流密度为 1 A g-1 时，比电容高达 1039.2 F g-1。当电流密度增加 10 倍时，ZnMn2O4/MnOOH 电极的电容量保持在初始电容量的 50%，达到 513.4 F g-1。此外，该电极还具有出色的循环稳定性，在 10 A g-1 条件下循环 5000 次后，仍能保持 95% 的初始容量。此外，所构建的 ZnMn2O4/MnOOH// 活性碳（AC）非对称超级电容器（ASC）装置在功率密度为 1384.5 W kg-1 的情况下实现了 29.45 Wh kg-1 的高能量密度。这些结果证实，只需一步合成就能制备的 ZnMn2O4/MnOOH 复合材料作为一种神奇的伪电容电极，在储能应用中显示出巨大的潜力。

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引用次数: 0

Effects of Gd2O3 additives on microscopical morphology of ZrB2-SiC sintering ceramic system: Insights for electron transpiration cooling Gd2O3 添加剂对 ZrB2-SiC 烧结陶瓷体系微观形貌的影响：电子蒸发冷却的启示

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.299

Renqi Yang , Xiuyi Ma , Shidi Mo , Meng Wu , Wei-Wei Xu , Hua Jin

By manipulating the work function, the dissipation of thermal energy on the material surface can be regulated through Electron Transpiration Cooling (ETC) mechanism. The doping of rare-earth oxide serves as an effective approach for reducing the work function, whereas there is still a lack of comprehensive research into the microstructural morphology of the rare-earth oxides and their correlations with the modifications of the work functions. This study investigates the detailed microscopical structure of Gd₂O₃ in the ultrahigh-temperature ceramic system (ZrB₂-20 vol%SiC). Semi-quantitative composition analyses based on X-ray photoelectron spectra indicate that an increased doping concentration of Gd₂O₃ is beneficial for the formation of a single solid-state Gd_0.18Zr_0.82O_1.91 phase of ZrB₂-SiC system. Atomic-scale scanning transmission electron microscopy (STEM) analyses suggest that Gd₂O₃ is enriched at the interfaces between SiC and ZrB₂ matrix with a nanoscale fibrous morphology composed of alternated Gd₂O₃ crystals and pores, rendering a continuous microstructure throughout the entire system. This peculiar microstructural morphology is anticipated to facilitate its diffusion along the grain boundary and the formation of Gd₂O₃ nanolayers at the surface region below the melting points of the ceramic matrix, which can efficiently lower the material work function and reduce the emission energy of the surface electrons during thermal emission through ETC mechanism. The composite with 10 vol% Gd₂O₃ induces a reduction of the averaged work function of ∼0.49 eV before preforming the thermionic emission experiments. Our results provide valuable insights into the impacts of rare-earth oxide on the ZrB₂-SiC matrix, as well as shed light on the feasibility of the ETC mechanism through the efficient design of thermal protection materials.

通过操纵功函数，可以通过电子传输冷却（ETC）机制调节材料表面的热能耗散。掺杂稀土氧化物是降低功函数的一种有效方法，但目前还缺乏对稀土氧化物微观结构形态及其与功函数变化相关性的全面研究。本研究调查了 Gd2O3 在超高温陶瓷体系（ZrB2-20 vol%SiC）中的详细微观结构。基于 X 射线光电子能谱的半定量成分分析表明，增加 Gd2O3 的掺杂浓度有利于在 ZrB2-SiC 系统中形成单一的固态 Gd0.18Zr0.82O1.91 相。原子尺度扫描透射电子显微镜（STEM）分析表明，Gd2O3 富集于 SiC 和 ZrB2 基体之间的界面，其纳米级纤维状形态由交替出现的 Gd2O3 晶体和孔隙组成，使整个体系呈现出连续的微观结构。这种奇特的微观结构形态可促进 Gd2O3 沿晶界扩散，并在陶瓷基体熔点以下的表面区域形成 Gd2O3 纳米层，从而有效降低材料的功函数，并通过 ETC 机制降低热发射过程中表面电子的发射能量。含有 10 vol% Gd2O3 的复合材料在进行热电子发射实验前，平均功函数降低了 ∼0.49 eV。我们的研究结果为了解稀土氧化物对 ZrB2-SiC 基体的影响提供了有价值的见解，并通过热保护材料的有效设计阐明了 ETC 机制的可行性。

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引用次数: 0

A new strategy to prepare MLG-SiCw/SiCp composites via three-roll milling exfoliation and catalytical-conversion for advanced refractories 通过三辊研磨剥离和催化转化制备 MLG-SiCw/SiCp 复合材料的新策略，用于先进耐火材料

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.329

Yang Xia, Lingyu Liu, Juntong Huang, Fangqiang Wang, Jiayao Bao, Zhi Chen, Jinbiao Qiu, Huiyong Yang, Ruiying Luo

Cost-effective decarbonization and structural strengthening of carbon-containing refractory materials are crucial for the development of low-carbon steel (LCS) and ultra-low-carbon steel (ULCS) technologies. In this study, a carbonaceous-ceramic reinforcement assembly structure composed of multilayer graphenes and silicon carbide whiskers/particles (MLGs-SiC_w/SiC_p) has been successfully designed and fabricated. By employing three-roll milling (TRM) for low-cost exfoliation of expanded graphite (EG) into MLGs in a phenolic resin (PF) medium, we optimized the exfoliation cycles to fine-tune the morphology of MLGs. Subsequently, the catalytical solid-state conversion of PF/MLGs reacting with Si into SiC_w/SiC_p at 1400 °C, under varying C/Si molar ratios and catalyst contents, not only retained the structural integrity of MLGs but also embedded them within a novel SiC_w/SiC_p composite matrix. Our research elucidates the catalytic conversion mechanism, underscoring the significant role of nickel catalysts in promoting efficient SiC conversion. This work offers a promising pathway for developing high-performance, economical, low-carbon refractories.

具有成本效益的含碳耐火材料脱碳和结构强化对于低碳钢（LCS）和超低碳钢（ULCS）技术的发展至关重要。本研究成功设计并制造了一种由多层石墨烯和碳化硅晶须/颗粒（MLGs-SiCw/SiCp）组成的碳质陶瓷增强装配结构。我们采用三辊研磨（TRM）技术，在酚醛树脂（PF）介质中将膨胀石墨（EG）低成本剥离成多层石墨烯，并优化了剥离周期以微调多层石墨烯的形态。随后，在不同的 C/Si 摩尔比和催化剂含量条件下，PF/MLGs 在 1400 °C 下与硅反应催化固态转化为 SiCw/SiCp，不仅保留了 MLGs 的结构完整性，而且还将其嵌入了新型 SiCw/SiCp 复合基质中。我们的研究阐明了催化转化机制，强调了镍催化剂在促进碳化硅高效转化中的重要作用。这项工作为开发高性能、经济型、低碳耐火材料提供了一条前景广阔的途径。

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引用次数: 0

Microstructure and properties of in situ TiCP/Mn18Cr2 architecture composites 原位 TiCP/Mn18Cr2 结构复合材料的微观结构和性能

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-24 DOI: 10.1016/j.ceramint.2024.09.322

Mojin Zhou , Jian Yang , Zulai Li , Yehua Jiang , Dehong Lu

In situ TiC ceramic particle-reinforced steel matrix composites, typically produced via liquid metal infiltration of unstructured preforms, often demonstrate issues with composite areas being prone to fracture. To address this problem, particles with an average diameter of 3 mm were constructed and used to fabricate preforms. Using the in situ self-generation method, the composites were then synthesised with liquid Mn18Cr2. To control the degree of in situ spontaneous reaction, moderator alloy powders at concentrations of 20, 30, 40 and 50 wt.% were utilised. The results reveal that the TiC particle size in the composites gradually decreases as the moderator concentration in the preform increases, reducing from 1.31 to 0.92 μm. The microhardness and elastic modulus at the composite interfaces are intermediate between those of the TiC ceramic particles and the high manganese steel matrix. The inclusion of millimetre-scale architecture enhances the tensile strength of the composites, with tensile strength gradually increasing as the moderator content decreases. This study offers a comprehensive understanding of how moderator content influences the microstructure and mechanical properties of TiC-reinforced Mn18Cr2 composites, providing valuable insights for the development of high-performance structural materials.

原位 TiC 陶瓷颗粒增强钢基复合材料通常是通过液态金属渗入非结构化预型件生产的，经常出现复合材料区域容易断裂的问题。为解决这一问题，我们构建了平均直径为 3 毫米的颗粒，并将其用于制造预型件。使用原位自生成方法，然后用液态 Mn18Cr2 合成复合材料。为了控制原位自发反应的程度，使用了浓度为 20、30、40 和 50 wt.% 的慢化剂合金粉末。结果表明，随着预型件中慢化剂浓度的增加，复合材料中的 TiC 粒径逐渐减小，从 1.31 μm 减小到 0.92 μm。复合材料界面的微硬度和弹性模量介于 TiC 陶瓷颗粒和高锰钢基体之间。毫米级结构的加入增强了复合材料的抗拉强度，随着慢化剂含量的减少，抗拉强度逐渐增加。这项研究全面了解了慢化剂含量如何影响 TiC 增强 Mn18Cr2 复合材料的微观结构和机械性能，为开发高性能结构材料提供了宝贵的见解。

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引用次数: 0

Enhanced thermal stability and excellent electrochemical and photocatalytic performance of needle-like form of zinc-phthalocyanine 针状锌酞菁的热稳定性增强，电化学和光催化性能优异

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International

Pub Date : 2024-09-23 DOI: 10.1016/j.ceramint.2024.09.290

Bojana R. Vasiljević , Jovana R. Prekodravac , Marjan S. Ranđelović , Jelena Z. Mitrović , Aleksandar Lj Bojić , Slavica Porobić Katnić , Milan Z. Momčilović , Dragana Marinković

This study proposes enhanced thermal stability and excellent electrochemical and photocatalytic performance of hierarchical structure of zinc-phthalocyanine (ZnPc) samples prepared through eco-friendly enhanced microwave (MW) synthesis over 5 min at T = 200 °C. The structure and morphology of the obtained ZnPc were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscope (TEM), and Atomic Force Microscope (AFM). At the same time, thermal stability was analyzed using thermogravimetric analysis (TGA) and differential thermal analysis (DTA). The obtained ZnPc with high crystallinity, pure crystalline phases and reflection peaks related to the β-form of ZnPc. The average crystallite size (D) of 74 nm was determined using the Debye-Scherrer equation for a peak at 2θ = 9.30°. AFM image presented ZnPc material as a distinguished multilayered crystal with a rhombus-shaped crystal structure that seems very smooth on its surface, while TEM images showed a hierarchical structure of synthesized ZnPc self-organized assembles from the needle-like morphology which are aligned at different orientations having length up to approximately 500 nm and with 20 nm in diameter. TGA and DTA showed that the decomposition process occurred at a high temperature of 649 °C, for a heating rate of 15 °C/min, indicating good thermal stability of the investigated ZnPc. The photocatalytic activity of the hierarchically structured ZnPc was evaluated using different initial concentrations of Reactive Blue 19 (RB-19), pH value, and catalyst dose. Additionally, the electrochemical performance of ZnPc as electrode material was investigated. This study indicates facile, low-cost, and green MW method can be used for the preparation of the needle-like form of ZnPc as a promising multifunctional material for the potential applications: in thermal energy storage in future solar power technologies, as electrode material exhibiting superior voltammetric response, with cathodic and anodic current values and as photocatalyst for degradation of RB-19 and other organic dye-pollutants.

本研究提出了通过环保型增强微波（MW）合成法在温度为 200 ℃ 的条件下 5 分钟制备的分层结构锌酞菁（ZnPc）样品，其热稳定性增强，电化学和光催化性能优异。通过 X 射线衍射 (XRD)、高分辨率透射电子显微镜 (TEM) 和原子力显微镜 (AFM) 对得到的 ZnPc 的结构和形貌进行了表征。同时，利用热重分析（TGA）和差热分析（DTA）分析了热稳定性。所获得的 ZnPc 结晶度高、晶相纯净，并出现了与 ZnPc β 形式相关的反射峰。根据 2θ = 9.30° 处的峰值，利用 Debye-Scherrer 公式确定了平均晶体尺寸 (D) 为 74 nm。原子力显微镜（AFM）图像显示 ZnPc 材料是一种独特的多层晶体，具有菱形晶体结构，表面看起来非常光滑；而 TEM 图像则显示合成的 ZnPc 自组织组装体具有分层结构，其形态呈针状，按不同方向排列，长度可达约 500 nm，直径为 20 nm。TGA 和 DTA 显示，在加热速率为 15 °C/min 时，分解过程发生在 649 °C 的高温下，这表明所研究的 ZnPc 具有良好的热稳定性。使用不同初始浓度的活性蓝 19（RB-19）、pH 值和催化剂剂量评估了分层结构 ZnPc 的光催化活性。此外，还研究了作为电极材料的 ZnPc 的电化学性能。这项研究表明，可以采用简便、低成本和绿色的 MW 方法制备针状 ZnPc，并将其作为一种具有潜在应用前景的多功能材料：用于未来太阳能发电技术中的热能储存；作为电极材料显示出卓越的伏安响应（阴极和阳极电流值）；以及作为光催化剂降解 RB-19 和其他有机染料污染物。

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引用次数: 0