Open Ceramics最新文献_第3页

Influence of aggregate particle packing on the mechanical and microstructural properties of iron-rich laterite-based geopolymer concretes 骨料颗粒充填对富铁红土基地聚合物混凝土力学和微观结构性能的影响

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-06 DOI: 10.1016/j.oceram.2025.100893

Rodrigue Cyriaque KAZE , Joseph MARAE DJOUDA , Benjamin Igor DJON LI NDJOCK , Abdolhossein NAGHIZADEH

This study investigated the effect of waste granite aggregate size on the fresh and hardened properties of high-performance concretes produced from iron-rich laterite calcined at 650°C. Three aggregate gradations of F1 (0-10 mm), F2 (0-6.5 mm), and F3 (0-5 mm), were incorporated into laterite-based geopolymer concretes and compared with Portland cement concretes produced under identical mix proportions. The activator-to-binder in geopolymer mixtures and water-to-cement ratio in Portland cement mixtures were fixed at 0.5, while the aggregate-to-binder ratio was kept constant at 2.95, regardless of the binder system. Fresh properties showed a moderate increase in slump when coarse fractions were excluded, rising from 15 to 18 mm in geopolymer mixtures and from 25 to 40 mm in Portland cement mixtures. Hardened concrete property evaluation revealed that mixtures made using F1 aggregates achieved the highest 28-day compressive strength values of 52.2 MPa for geopolymer and 48.1 MPa for Portland cement systems, along with lower porosity (10-11 %) and reduced water absorption (4.3-4.8 %). Conversely, mixes with finer F2 and F3 aggregates exhibited reduced strengths (34-45 MPa), higher porosity (14-16 %), and greater water absorption (6.5-7.2 %), confirming the detrimental effect of insufficient particle packing. Bulk density values ranged from 2230-2260 kg/m³ for mixtures containing F1 aggregate, which were higher than those of 2170 and 2200 kg/m³ for F2 and F3, respectively. Oven curing of geopolymer concretes at 60°C for 24 hours led to significant strength losses (20.3-26.6 MPa), due to rapid moisture loss and incomplete geopolymerization. Overall, the results highlight that particle size distribution plays a decisive role in optimising concrete performance, with F1 aggregates providing the most favourable balance of workability, density, and strength. The study further demonstrates the potential of thermally activated iron-rich laterite, an abundant but underutilised resource in tropical regions, combined with waste granite aggregates to produce sustainable concretes with properties comparable to Portland cement systems.

研究了废花岗岩骨料粒径对富铁红土650℃煅烧制备的高性能混凝土新鲜性能和硬化性能的影响。将F1 （0-10 mm）、F2 （0-6.5 mm）和F3 （0-5 mm）三种骨料级配掺入红土基地聚合物混凝土中，并与相同配合比下生产的波特兰水泥混凝土进行比较。无论采用何种粘结剂体系，地聚合物混合料的活化剂与粘结剂、硅酸盐水泥混合料的水灰比均固定为0.5，而骨料与粘结剂的比均保持恒定为2.95。当排除粗馏分时，新鲜性能显示出适度的坍落度增加，在地聚合物混合物中从15到18 mm增加，在波特兰水泥混合物中从25到40 mm增加。硬化混凝土性能评估显示，使用F1骨料制成的混合物达到了最高的28天抗压强度值，地聚合物为52.2 MPa，波特兰水泥体系为48.1 MPa，同时孔隙率（10- 11%）和吸水率（4.3- 4.8%）也降低了。相反，F2和F3团聚体较细的混合料强度降低（34-45 MPa），孔隙率提高（14- 16%），吸水率提高（6.5- 7.2%），证实了颗粒堆积不足的不利影响。F1骨料混合物的容重值为2230 ~ 2260 kg/m³，分别高于F2和F3的2170和2200 kg/m³。地聚合物混凝土在60°C下进行24小时的烘箱养护，由于水分流失迅速和地聚合物不完全，导致强度损失显著（20.3-26.6 MPa）。总体而言，结果强调粒径分布在优化混凝土性能方面起着决定性作用，F1骨料在和易性、密度和强度方面提供了最有利的平衡。该研究进一步证明了热活化富铁红土的潜力，这是热带地区丰富但未充分利用的资源，与废花岗岩骨料相结合，可以生产出具有与波特兰水泥系统相当性能的可持续混凝土。

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引用次数: 0

Sintering temperature dependence on microstructure and electrical properties of Co2.38Mn1.62Fe1.6Zn0.4O8 ceramics for NTC thermistors 烧结温度对Co2.38Mn1.62Fe1.6Zn0.4O8 NTC热敏电阻显微结构和电性能的影响

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-12-06 DOI: 10.1016/j.oceram.2025.100894

Jinghao Rong, Tingqing Cai, Haichao Li, Shuai Wang, Jiayao Zhang, LiangKui Peng, Shizhao Liu

Co–Mn–Fe–Zn–O-based ceramics are important negative temperature coefficient (NTC) materials. To clarify the processing-property relationship, Co₂.₃₈Mn₁.₆₂Fe₁.₆Zn₀.₄O₈ ceramics were prepared via the solid-state method, and the effects of sintering temperature (1100–1300°C) on their microstructure, electrical properties, and aging behavior were systematically investigated. XRD and SEM analyses revealed that higher temperatures promoted grain growth and densification, with the average grain size increasing from 1.6 μm to 5.3 μm. The room-temperature resistivity (ρ₂₅) exhibited a non-monotonic trend, initially increasing from 3327 Ω·cm at 1100°C to a maximum of 4287 Ω·cm at 1250°C, then decreasing to 3020 Ω·cm at 1300°C. XPS analysis indicated that the Mn³⁺/Mn⁴⁺ ratio decreased monotonically from 99.5% to 65.4% with increasing sintering temperature. This suggests that the resistivity evolution is governed by a transition in the dominant mechanism: small polaron hopping between Mn³⁺ and Mn⁴⁺ ions at lower temperatures (≤1250°C), and grain boundary scattering due to significant grain growth at higher temperatures (≥1250°C). Furthermore, all samples demonstrated excellent aging stability with a resistance drift (ΔR/R) below 0.20% over 800 hours, with the sample sintered at 1250°C achieving the optimal combination of high resistivity (4287 Ω·cm) and minimal drift (0.16%), attributable to its dense microstructure and balanced cation valence. This work provides valuable insights for optimizing the sintering process of NTC ceramics to achieve superior electrical performance and long-term stability.

co - mn - fe - zn基陶瓷是一种重要的负温度系数材料。为明确加工性质关系，Co₂.₃₈Mn₁.₆Fe₁.₆Zn₀。采用固相法制备了₄O₈陶瓷，系统研究了烧结温度（1100 ~ 1300℃）对其微观结构、电学性能和时效性能的影响。XRD和SEM分析表明，高温促进了晶粒的生长和致密化，平均晶粒尺寸从1.6 μm增加到5.3 μm。室温电阻率（ρ₂₅）呈现非单调趋势，最初从1100℃时的3327 Ω·cm增加到1250℃时的最大值4287 Ω·cm，然后在1300℃时下降到3020 Ω·cm。XPS分析表明，随着烧结温度的升高，Mn³+ /Mn⁴+的比值从99.5%单调下降到65.4%。这表明电阻率的演化受主导机制的转变支配：在较低温度（≤1250°C）下，Mn³+和Mn⁴+离子之间存在较小的极化子跳变，在较高温度（≥1250°C）下，晶粒生长导致晶界散射。此外，所有样品在800小时内均表现出优异的时效稳定性，电阻漂移（ΔR/R）低于0.20%，其中1250℃烧结的样品由于其致密的微观结构和平衡的阳离子价，实现了高电阻率（4287 Ω·cm）和最小漂移（0.16%）的最佳组合。这项工作为优化NTC陶瓷的烧结工艺以获得优异的电性能和长期稳定性提供了有价值的见解。

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引用次数: 0

Effects of annealing dwell time on piezoelectric properties of KNN thin films: Phase insensitive behavior 退火时间对KNN薄膜压电性能的影响：相不敏感行为

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-28 DOI: 10.1016/j.oceram.2025.100892

Binjie Chen , Fang-Zhou Yao , Zhongshang Dou , Wenying Fan , Dongfang Yu , Binglin Shen , Chao-Feng Wu , Qiang He , Chen Tian , Sheng Hu , Wen Gong , Ke Wang

Amorphous potassium sodium niobate (KNN) thin films were deposited onto Pt/Ti/SiO₂/Si substrates at 200 °C using magnetron sputtering. The resultant films were then annealed in an alkali metal element atmosphere formed by alkali metal carbonates. The influence of annealing dwell time on the films' properties was investigated. It was observed that while the overall crystalline phase and elemental composition of the films remained essentially unchanged, their electrical characteristics exhibited systematic variations. Microscopic analysis revealed that extending the annealing time within an optimal range facilitated the formation of ferroelectric domain structures and enhanced piezoresponse phase contrast between domains. However, prolonged annealing led to localized phase segregation, resulting in performance degradation. Our results provide useful insights into the fabrication of KNN thin films using magnetron sputtering or other thermally involved synthesis methods.

采用磁控溅射技术在Pt/Ti/SiO2/Si衬底上制备了非晶铌酸钾钠（KNN）薄膜。然后在碱金属碳酸盐形成的碱金属元素气氛中对所得薄膜进行退火。研究了退火时间对薄膜性能的影响。结果表明，虽然薄膜的整体晶相和元素组成基本保持不变，但其电特性却呈现出系统的变化。微观分析表明，在最佳范围内延长退火时间有利于铁电畴结构的形成，并增强了畴间的压响应相对比。然而，长时间退火导致局部相偏析，导致性能下降。我们的研究结果为利用磁控溅射或其他热相关合成方法制备KNN薄膜提供了有用的见解。

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引用次数: 0

Dual effects of amorphous SiO2 in ZrO2-SiO2 nanoceramics: Enable viscous flow sintering and inhibit grain coarsening 非晶SiO2在ZrO2-SiO2纳米陶瓷中的双重作用：促进粘性流动烧结和抑制晶粒粗化

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-21 DOI: 10.1016/j.oceram.2025.100889

Le Fu , Mingxi Deng , Zihua Lei , Jiang Li , Wei Xia

In this study, we investigated the effects of amorphous SiO₂ on the sintering mechanism and grain coarsening behavior of ZrO₂ nanograins in ZrO₂–SiO₂ nanocrystalline ceramics (NCCs) during pressureless sintering (PLS). Two NCCs with different ZrO₂/SiO₂ molar ratios (65 %:35 % and 50 %:50 %) were fabricated and subsequently sintered via PLS. Their densification behavior and phase composition were analyzed. The SiO₂ content had a significant effect on the activation of viscous flow sintering. The NCC containing 50 mol% SiO₂ achieved high densification after sintering at 1210 °C, whereas a higher temperature of 1250 °C was required to enable significant densification in the NCC with 35 mol% SiO₂. The crystallization of ZrO₂ restricted the viscous flow of SiO₂, thereby impeding the densification process. Hot isostatic pressing did not eliminate the residual pores remaining after PLS. The SiO₂ matrix was capable of inhibiting the coarsening of ZrO₂ nanograins by acting as a diffusion barrier. These findings reveal the dual effects of amorphous SiO₂ during PLS and provide guidance for the fabrication of dense NCCs with minimal grain coarsening.

在本研究中，我们研究了无定形SiO2对ZrO2 - SiO2纳米晶陶瓷（NCCs）无压烧结（PLS）过程中ZrO2纳米颗粒烧结机理和晶粒粗化行为的影响。制备了两种不同ZrO2/SiO2摩尔比（65%:35%和50%:50%）的ncc，并通过PLS烧结，分析了它们的致密化行为和相组成。SiO2含量对黏性流动烧结的活化有显著影响。含有50 mol% SiO2的NCC在1210℃烧结后实现了高密度化，而含有35 mol% SiO2的NCC则需要1250℃的高温才能实现显著的致密化。ZrO2的结晶限制了SiO2的粘性流动，从而阻碍了致密化过程。热等静压并不能消除PLS后的残余孔隙，SiO2基体作为扩散屏障能够抑制ZrO2纳米颗粒的粗化。这些发现揭示了非晶SiO2在PLS过程中的双重作用，并为制备晶粒粗化程度最低的致密NCCs提供了指导。

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引用次数: 0

Mechanical performance and microstructural evolution of yttria-stabilized zirconia ceramics processed via direct ink writing 直接墨水书写法制备氧化钇稳定氧化锆陶瓷的力学性能及微观结构演变

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-20 DOI: 10.1016/j.oceram.2025.100888

Mona Yarahmadi , Junhui Zhang , Laia Ortiz-Membrado , Marc Serra , Laura Cabezas , Joan Josep Roa , Luis Llanes , Gemma Fargas

This study investigates the mechanical and microstructural properties of yttria-stabilized zirconia ceramics with varying Y₂O₃ content (3–5 mol. %) fabricated via Direct Ink Writing (DIW) and and compared with those produced by Cold Isostatic Pressing (CIP). XRD, Raman spectroscopy, and electron microscopy analyses confirmed that increasing Y₂O₃ content promotes higher cubic phase fractions and grain coarsening, which enhances hardness but reduces indentation fracture toughness. Despite achieving near-theoretical densities (∼95 %), the DIW specimens exhibited lower mechanical performance due to processing-induced porosity and interlayer flaws. For the same 3Y-ZrO₂ composition, the flexural strength decreased substantially—from ∼800 MPa in CIP-processed samples to ∼500 MPa in DIW-processed ones—due to defects introduced during the DIW process. These results underscore the crucial role of microstructure and defect control in enhancing the performance of additively manufactured zirconia for structural applications.

研究了直接墨水书写法（DIW）制备的Y2O3含量（3-5 mol. %）不同的氧化锆稳定陶瓷的力学和微观结构性能，并与冷等静压法（CIP）制备的陶瓷进行了比较。XRD、拉曼光谱和电镜分析证实，增加Y2O3含量可以提高立方相分数和晶粒粗化，从而提高硬度，但降低压痕断裂韧性。尽管达到了接近理论的密度（~ 95%），但由于加工引起的孔隙率和层间缺陷，DIW试样表现出较低的力学性能。对于相同的3Y-ZrO2成分，由于DIW过程中引入的缺陷，弯曲强度大幅下降-从cip处理样品的~ 800 MPa降至DIW处理样品的~ 500 MPa。这些结果强调了微观结构和缺陷控制在提高增材制造氧化锆结构性能中的重要作用。

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引用次数: 0

Transforming FDM into a high-performance tool for multifunctional ceramic 3YSZ fabrication 将FDM转变为多功能陶瓷3YSZ制造的高性能工具

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-19 DOI: 10.1016/j.oceram.2025.100887

Aiswarya Anil , Raghukiran Nadimpalli

This work demonstrates the additive manufacturing of 3Yttria-Stabilised Zirconia (3YSZ) via Fused Deposition Modeling (FDM) and subsequent sintering at 1475 °C. The influence of infill geometry and density on dielectric, mechanical, thermal, and microstructural behaviour was systematically studied. SEM confirmed uniform grain growth and phase distribution. Density and porosity data further validated the influence of design and sintering on final part quality. Thermal expansion analysis indicated structural stability at elevated temperatures. Flexural strength peaked at 187.5 MPa with 75 % honeycomb infill, decreasing to 48.75 MPa at 50 %, reflecting the role of internal architecture in mechanical performance. A high dielectric constant (ε ≈ 35) was observed for 100 % line infill, while gyroid and honeycomb architectures showed significantly reduced values (ε ≈ 2–9.15), revealing strong geometry-dependent dielectric transparency. The absence of cracks in sintered parts highlights the effectiveness of the thermal strategy. These findings establish FDM-processed YSZ as a tunable, high-performance ceramic for advanced structural and electronic applications.

这项工作展示了通过熔融沉积建模（FDM）和随后在1475°C下烧结的3钇稳定氧化锆（3YSZ）的增材制造。系统地研究了填料的几何形状和密度对介电、力学、热学和微观结构行为的影响。SEM证实晶粒生长均匀，相分布均匀。密度和孔隙率数据进一步验证了设计和烧结对最终零件质量的影响。热膨胀分析表明在高温下结构稳定。当蜂窝填充量为75%时，抗弯强度达到峰值187.5 MPa，当填充量为50%时，抗弯强度降至48.75 MPa，反映了内部结构对力学性能的影响。100%线填充时，观察到较高的介电常数（ε≈35），而陀螺和蜂窝结构的介电常数显著降低（ε≈2-9.15），显示出强的几何依赖性介电透明度。烧结件中没有裂纹突出了热策略的有效性。这些发现确立了fdm加工的YSZ是一种可调谐的高性能陶瓷，适用于先进的结构和电子应用。

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引用次数: 0

Pressure-less joining materials for SiC-based components for light water reactors 轻水反应堆用sic基组件的无压连接材料

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-19 DOI: 10.1016/j.oceram.2025.100886

Monica Ferraris , Stefano De la Pierre , Valentina Casalegno , Rik-Wouter Bosch , James Marrow , Yang Chen , Frédérique Bourlet , Christophe Lorrette , Shuigen Huang , Konstantina Lambrinou

Silicon carbide fiber-reinforced composites (SiC/SiC) are leading candidates to replace zirconium-based alloys as cladding in light water reactors (LWR), owing to their exceptional oxidation resistance and mechanical performance under accident conditions.

However, pressure-less joining methods compatible with the extreme chemical and thermal environment of LWRs remain a major technological hurdle.

This work evaluates two promising joining materials—Mo-wrap (a MoSi₂/Si composite) and SAY (a silica–alumina–yttria glass-ceramic)—under simulated LWR conditions.

Joining was performed using both conventional furnaces and laser-assisted techniques.

Joint integrity and microstructure were assessed by SEM/EDS and X-ray computed tomography. Hydrothermal stability was evaluated in static and flowing-water (loop) autoclaves up to 30 days at 330 °C and 150–155 bar.

Mo-wrap joints showed partial degradation due to silicon dissolution, while SAY joints retained good structural integrity in static tests but suffered phase-selective corrosion under flowing conditions, with keivite emerging as the most stable crystalline phase.

Laser-processed amorphous SAY joints exhibited improved corrosion resistance, though still limited under prolonged exposure.

These findings advance the understanding of joining performance in nuclear-relevant environments and support the development of accident-tolerant fuel cladding.

碳化硅纤维增强复合材料（SiC/SiC）由于其优异的抗氧化性能和事故条件下的机械性能，成为取代锆基合金作为轻水反应堆（LWR）包层的首选材料。然而，与轻水堆极端化学和热环境相适应的无压力连接方法仍然是一个主要的技术障碍。本研究在模拟LWR条件下评估了两种有前途的连接材料- mo -wrap （MoSi₂/Si复合材料）和SAY（硅-氧化铝-钇玻璃陶瓷）。采用传统炉和激光辅助技术进行连接。通过扫描电镜/能谱仪和x射线计算机断层扫描评估关节的完整性和微观结构。在静态和流动水（循环）高压灭菌器中，在330°C和150-155 bar下，热液稳定性进行了长达30天的评估。Mo-wrap接头由于硅溶解而出现部分退化，而SAY接头在静态测试中保持了良好的结构完整性，但在流动条件下发生了相选择腐蚀，其中钾辉石是最稳定的晶相。激光加工的非晶SAY接头表现出更好的耐腐蚀性，但在长时间暴露下仍然有限。这些发现促进了对核相关环境中连接性能的理解，并支持了耐事故燃料包壳的开发。

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引用次数: 0

Magnetic alkali-activated foams from soda-lime glass and volcanic ash enabling efficient synergistic dye removal 从钠石灰玻璃和火山灰中提取的磁性碱活化泡沫，可以有效地协同去除染料

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-19 DOI: 10.1016/j.oceram.2025.100884

Francesco Lanero , Giulia Tameni , Eleonora Russo, Paolo Sgarbossa, Enrico Bernardo

As a solution to clean water scarcity, it is essential to develop new inexpensive and eco-friendly materials for wastewater treatment, since conventional methods are often energy-intensive, dependent on non-renewable and, in general, unsuitable for large-scale and sustainable applications. In this work, the preparation of magnetic foams via mild alkali activation (KOH, 3 M) process for water purification is reported. The process uses Mt. Etna volcanic ash and unemployed fraction of soda-lime glass obtained from purification of glass containers. Magnetic properties were imparted by the introduction of silica-coated magnetite nanoparticles at 5 % (m/m) and 10 % (m/m). The large surface area of the resulting foams makes them highly promising as adsorbent for dye removal. Additionally, the natural presence of TiO₂ and Fe₂O₃ in the volcanic ash contributes to photocatalytic activity. Both adsorption and photocatalytic performance were evaluated using methylene blue aqueous solution (10 mg/L) as model dye. An increased removal efficiency was observed following the incorporation of magnetite nanoparticles, reaching up to 96 %. These results highlight the potential of converting industrial and natural waste into functional materials for sustainable wastewater treatment applications.

作为清洁水短缺的解决办法，必须开发新的廉价和生态友好的废水处理材料，因为传统方法往往是能源密集型的，依赖于不可再生，一般不适合大规模和可持续的应用。本文报道了用温和碱活化（KOH, 3 M）法制备用于水净化的磁性泡沫。该工艺使用埃特纳火山火山灰和从玻璃容器净化中获得的钠石灰玻璃的残余部分。通过引入5% （m/m）和10% （m/m）的二氧化硅包覆磁铁矿纳米颗粒来提高磁性能。所产生的泡沫的大表面积使它们作为染料去除的吸附剂非常有前途。此外，火山灰中TiO2和Fe2O3的天然存在有助于光催化活性。以亚甲基蓝水溶液（10 mg/L）为模型染料，考察其吸附和光催化性能。在加入磁性纳米颗粒后，观察到去除效率提高，达到96%。这些结果突出了将工业和自然废物转化为可持续废水处理应用的功能材料的潜力。

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引用次数: 0

Self-healing and optical damage sensing in quantum-architected MXene–graphene–gold nanocomposite coatings 量子结构mxene -石墨烯-金纳米复合涂层的自修复和光损伤传感

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-17 DOI: 10.1016/j.oceram.2025.100885

Arash Vaghef-Koodehi, Yaser Bahari

The next generation of spacecraft and military vehicles requires smart protective coatings that can automatically repair radiation damage while maintaining peak performance under extreme conditions. We have developed an innovative three-layer material system that combines titanium carbide nanoparticles (2–8 nanometers), ultra-thin graphene sheets, and microscopic gold particles (10–20 nanometers) embedded in a flexible polymer matrix. This advanced coating can heal itself with remarkable efficiency—recovering 94.6 % of its original strength within just 18 h after radiation exposure. Our research used powerful computer simulations to design the optimal arrangement of these components at the atomic level. We discovered that spacing the titanium carbide particles exactly 3.2 angstroms from the graphene creates pathways for damaged atoms to migrate and repair themselves, requiring only moderate heating (activation energy of 0.35 electron volts). The gold nanoparticles act as both damage sensors and localized heaters, amplifying electromagnetic fields by over 2000 times to enable real-time monitoring and precisely controlled healing. Large-scale molecular modeling of 3.2 million atoms confirmed that our material maintains excellent mechanical properties—comparable to aerospace-grade materials—while remaining flexible enough to bend around tight curves (1.2 mm radius). Comprehensive radiation testing simulations predict the coating will retain over 95 % of its protective capabilities after 8000 h of exposure across three demanding environments: deep space missions (-200 °C to +180 °C temperature swings), ballistic impact scenarios, and nuclear facilities (intense neutron bombardment). Initial laboratory experiments have validated our theoretical predictions, demonstrating 91 % healing efficiency and repair times under 20 h. This breakthrough establishes a new class of autonomous protective materials that could revolutionize how we design systems for extreme environments, from Mars exploration vehicles to nuclear reactor components.

下一代航天器和军用车辆需要智能防护涂层，可以自动修复辐射损伤，同时在极端条件下保持峰值性能。我们开发了一种创新的三层材料系统，将碳化钛纳米颗粒（2-8纳米），超薄石墨烯片和微观金颗粒（10-20纳米）嵌入柔性聚合物基质中。这种先进的涂层可以以惊人的效率自愈，在辐射暴露后的18小时内恢复其原始强度的94.6%。我们的研究使用强大的计算机模拟来设计这些组件在原子水平上的最佳排列。我们发现，将碳化钛颗粒与石墨烯间距正好为3.2埃，为受损原子的迁移和自我修复创造了途径，只需要适度加热（活化能为0.35电子伏特）。金纳米颗粒同时充当损伤传感器和局部加热器，将电磁场放大2000倍以上，从而实现实时监测和精确控制愈合。320万个原子的大规模分子模型证实，我们的材料保持了优异的机械性能——与航空级材料相当——同时保持了足够的柔韧性，可以绕紧曲线弯曲（半径1.2毫米）。综合辐射测试模拟预测，在深空任务（-200°C至+180°C的温度波动）、弹道冲击场景和核设施（强烈中子轰炸）三种苛刻环境下，在8000小时的暴露后，涂层将保持95%以上的防护能力。最初的实验室实验验证了我们的理论预测，证明了91%的修复效率和20小时内的修复时间。这一突破建立了一类新的自主保护材料，可以彻底改变我们如何设计极端环境的系统，从火星探测车辆到核反应堆组件。

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引用次数: 0

Synchrotron-based X-ray computed tomography analysis of the internal structure and moisture adsorption–desorption behavior of the heat storage and dissipation material HASClay® 基于同步加速器的储热材料HASClay®的内部结构和吸湿解吸行为的x射线计算机断层扫描分析

IF 2.8 Q1 MATERIALS SCIENCE, CERAMICS

Open Ceramics

Pub Date : 2025-11-15 DOI: 10.1016/j.oceram.2025.100882

Satomi Fujisaki , Rimpei Shibata , Souta Arakawa , Yuichi Kouno , Goh Mitoya , Hidetaka Miyahara , Kazuko Manpuku , Masaya Suzuki , Moe Tanuma , Hidehiro Sekimoto , Akio Yoneyama , Masakazu Yoshioka , Ichiro Hirosawa , Noriyuki Yoshimoto

HASClay, a porous material designed for heat storage and dissipation, efficiently utilizes low-temperature waste heat below 100 °C. In this study, its internal density structure and moisture adsorption–desorption behavior were investigated using synchrotron radiation–based X-ray computed tomography (CT). X-ray CT analysis revealed distinct high- and low-density regions within HASClay, with the density of both regions increasing as moisture content increased due to water vapor adsorption. In addition, the morphology and distribution of these regions varied depending on the product associated with the temperature during synthesis. Because high-density regions adsorb moisture more efficiently than low-density regions, it was suggested that a key design strategy for improving HASClay is to increase the proportion of high-density regions. Furthermore, HASClay samples subjected to repeated moisture adsorption–desorption cycles exhibited reduced moisture desorption capacity compared with fresh samples. These findings demonstrate that X-ray CT is an effective technique to reveal the water vapor adsorption and desorption process of HASClay based on changes in the internal density distribution.

HASClay是一种多孔材料，专为储热和散热而设计，有效利用100°C以下的低温废热。本研究利用同步辐射x射线计算机断层扫描（CT）研究了其内部密度结构和水分吸附-解吸行为。x射线CT分析显示，HASClay内部存在明显的高密度和低密度区域，随着水蒸气吸附导致含水率的增加，这两个区域的密度也随之增加。此外，这些区域的形态和分布取决于合成过程中与温度相关的产物。由于高密度区域比低密度区域更有效地吸附水分，因此建议改进HASClay的关键设计策略是增加高密度区域的比例。此外，与新鲜样品相比，经过多次水分吸附-解吸循环的HASClay样品表现出较低的水分解吸能力。这些结果表明，x射线CT是一种有效的技术，可以根据内部密度分布的变化来揭示HASClay的水蒸气吸附和解吸过程。

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