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Melt-blending synthesis of v-GO/PCS precursor for deriving thermostable and microwave-absorbing rGO/SiC fibers

ceramics International 2025年第13期51卷 17138-17147页

作者： Liu, Tao Han, Cheng Wu, Xiaohan Wang, Yongjun Ou, Yucheng Zhang, Songhe Song, Quzhi Zhang, Xiaoshan Wang, Shanshan Wang, Yingde Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China

Silicon carbide (SiC) fiber is considered an excellent reinforcement for high-temperature microwave-absorbing composites. Embedding graphene (Gr) to SiC monolithic ceramics has been proven to be a notable enhancement in both mechanical and microwave-absorbing properties. However, achieving homogeneous dispersion of Gr within SiC fibers remains a formidable challenge. Herein, we proposed a melt blending strategy without solution to prepare homogeneous-dispersed vinyl-bridged graphene oxide/polycarbosilane (v-GO/PCS) precursor. Subsequently, rGO/SiC fibers were fabricated using the polymer-derived ceramic (PDC) method. The distinctively wrinkled structure of rGO interlocks with the SiC fiber matrix, reinforcing the pulling-out and bridging mechanisms during the fiber fracture process, leading to a 36 % increase in the tensile strength of the 0.1%-rGO/SiC (as-received) fibers compared to the 0%-rGO/SiC (as-received) fibers. Moreover, rGO effectively stabilizes the amorphous SiCxOy and inhibits the rapid growth of SiC grains under high temperatures, resulting in a notable strength retention rate of 64 % for 0.1%-rGO/SiC fibers after 1600oC-treatment. The reflection loss (RL) value of as-received 0.1%-rGO/SiC fibers reaches a minimum of −42.6 dB at 11.9 GHz, with an effective absorption bandwidth of 2.2 GHz (10.2–12.4 GHz). The results indicate that the melt blending strategy for uniformly embedding rGO into SiC fiber effectively achieves synergistic improvement of thermal stability and microwave-absorbing properties. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Silicon carbide

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High temperature mechanical and fatigue properties of sol-derived C/Mullite composites

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ceramics International 2025年

作者： Zhang, Wei Hong, Sen Ma, Qingsong Zeng, Kuanhong Mao, Weiguo College of Materials Science and Engineering Changsha University of Science & Technology Changsha410114 China Science and Technology on Advanced Ceramic Fibers &Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of Technology Harbin150001 China

To reveal the in-situ mechanical properties evolution and failure behavior of C/Mullite composites at high temperature, the in-situ mechanical and fatigue properties of the composites at high temperature were systematically studied in present study. The results suggested that C/Mullite composites presented admirable high temperature mechanical properties in air. The flexural strength of the composites at 1200 °C∼1400 °C was higher than that at room temperature. The composites showed retention of ∼120 % in flexural strength at 1400 °C. The enhanced flexural strength was ascribed to the released thermal stress. The composites showed the fracture toughness of ∼13.5 MPa m1/2 at 1200 °C. Although the fracture toughness of the composites decreased to about 5.6 MPa m1/2 at 1500 °C due to oxidation, the composites exhibited strength retention of ∼94 % at this moment. Furthermore, C/Mullite composites exhibited excellent fatigue performance at 1200 °C in vacuum. The composites was survived after 105 cycles of fatigue loading when the stress level did not exceed 75 %, and there was no decline in in-situ mechanical properties of the composites after 105 cycles of fatigue loading under the stress level of 70 %. The present study further verified the application potential of C/Mullite composites as thermal protection materials. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Thermal fatigue

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纤维表面涂层对碳化硅纤维增强复合材料吸波性能的影响规律（英文）

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science China Materials 2025年第5期68卷 1665-1675页

作者：李静丹施巧英王淇郭楷圣李锦堂许超李思维 College of Materials Fujian Key Laboratory of Advanced MaterialsXiamen University Xiamen Talentmats New Materials Science & Technology Co. Ltd. Key Laboratory of High Performance Ceramic Fibers (Xiamen University) Ministry of Education

多尺度结构调控对于优化纤维增强复合材料的电磁波吸收（EWA）性能具有重要意义.本研究选取了两种吸波SiC纤维作为增强体,L-纤维的电阻率约为3Ω·c m,而H-纤维的电阻率则较高,约为7×10～5Ω·cm.为调节阻抗匹配,在L-纤维... 详细信息

多尺度结构调控对于优化纤维增强复合材料的电磁波吸收（EWA）性能具有重要意义.本研究选取了两种吸波SiC纤维作为增强体,L-纤维的电阻率约为3Ω·c m,而H-纤维的电阻率则较高,约为7×10～5Ω·cm.为调节阻抗匹配,在L-纤维表面分别制备了BN单层涂层和SiO2/BN双层涂层.采用不同铺层规则堆叠含不同纤维的单向预浸料,制备了最终的复合材料.结果表明,纤维表面涂层和叠层结构对复合材料的EWA性能有显著影响.经过计算优化,叠层复合材料在整个X频段（8.2–12.4 GHz）和Ku频段（12.4–18.0 GHz）均实现了优异的吸波性能,反射损耗小于–10 dB.值得注意的是, L-纤维表面涂层显著拓宽了叠层复合材料的可用厚度范围,使其能够在更广泛的厚度条件下保持优异的吸波性能.相比之下,双层涂层在拓宽复合材料可用厚度范围上展现出更显著的优势.

关键词： wave-absorbing SiC fibers fiber surface coating stacking structure computational optimization

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Research on the induced crystallization behavior of high-performance thermoplastics resin-based composites

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Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica 2025年第5期42卷 2331-2348页

作者： Yu, Kun Yao, Jianan Zhang, Daijun Liu, Gang Liu, Hao Chen, Chunhai Center for Advanced Low-dimension Materials State Key Laboratory for Modification of Chemical Fibers and Polymer Materials College of Materials Science and Engineering Donghua University Shanghai201620 China AECC Beijing Institute of Aeronautical Materials Beijing100095 China National Key Laboratory of Advanced Composites Beijing100095 China Institute of Advanced Technology and Equipment Beijing University of Chemical Technology Beijing100029 China

In thermoplastic resin-based composites, optimizing interfacial properties is crucial for enhancing the overall characteristics of the composites. When carbon fibers (CF) are employed as the reinforcement, combined with semi-crystalline high-performance thermoplastic resins such as polyetheretherketone (PEEK), polyaryletherketone (PAEK), or polyphenylene sulfide (PPS) as the matrix, the induced crystallization phenomenon at the fiber/resin interface significantly impacts the interfacial properties of the composite. Taking the issue of induced crystallization in the study of high-performance thermoplastic resin-based composites as the starting point, this article comprehensively reviews the research progress in this area. The article covers the entire process from the preparation methods of induced crystallization samples to their final performance changes, analyzes the classification and influencing factors of induced crystallization, and describes several typical transcrystallinity (TC) morphologies in high-performance thermoplastic resins. Additionally, this article focuses on discussing the specific impact of TC on the interfacial properties of high-performance thermoplastic resin-based composites, and proposes the existing problems and challenges in this field. © 2025 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

关键词： Carbon fibers

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Atmospheric Switching between Etching and High-Quality Fluorination of Graphene by XeF₂

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ACS Applied Materials and Interfaces 2025年第21期17卷 31257-31264页

作者： Yan, Xingheng Zhang, Xiangzhe Lv, Bowen Zou, Yichao Zhang, Mengya We, Haitao Yu, Tongcheng Cai, Junhao Liu, Sen Li, Junsheng Zhou, Xingui Yang, Yaping Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha 410073 China Space Engineering University Beijing 101400 China College of Advanced Interdisciplinary Study National University of Defense Technology Changsha 410073 China School of Materials Science and Engineering Sun Yat-sen University Guangzhou 510275 China The College of Electronic Science and Technology National University of Defense Technology Changsha 410073 China

Fluorinated graphene (FG), a two-dimensional graphene derivative, has attracted wide attention due to its extraordinary physical and chemical properties, as well as its underlying applications. The treatment of xenon difluoride (XeF₂) has proved to be an effective way to achieve FG with different stoichiometric F/C ratios without graphene being etched. Here we compare the fluorination of mechanically exfoliated graphene by a home-built XeF₂ fluorination system and a commercial Orbis XeF₂ etching system. During fluorination in the Orbis etching system, graphene behaves as a protective mask for the silicon substrate, as expected from reported studies ( Robinson, J. T. Nano Lett. 2010, 10, 3001−3005, 10.1021/nl101437p;Rangarajan, A. Graphene as an etch mask for silicon. University of Illinois at Urbana-Champaign, 2014 ). However, in the home-built system, the results surprisingly demonstrate that graphene starts to be etched from the interface of graphene edges and the substrate, which we attribute to the introduction of water molecules during fluorination. We also find that quenching of graphene Raman signatures does not necessarily mean that all carbon atoms are covalently bound to a fluorine atom but that it probably arises from the etching away of graphene. These results reveal the importance of atmospheric water in the synthesis chemistry and derivative reactions of FG, and they provide guidance for its structure engineering to achieve high-quality FG formation. © 2025 American Chemical Society.

关键词： etching fluorination graphene water molecules XeF2

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Hot Corrosion Behavior of Lapo4-Ysz Thermal Barrier Coating Exposed to Molten Calcium-Magnesium-Alumino-Silicate (Cmas) at 1250°C-1350°C

SSRN

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SSRN 2025年

作者： Deng, Panhao Huang, Wenzhi Zhong, Ruiqi Yu, Yiping Lou, Junhua Deng, Zixin Zhou, Xin Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and Engineering National University of Defense Technology Changsha410073 China Qingdao Brunch of Naval Aeronautics University Qingdao China College of Intelligence Science and Technology National University of Defense Technology Changsha410073 China Institute for Advanced Studies in Precision Materials Yantai University Yantai264005 China National University of Defense Technology China

The calcium-magnesium-alumina-silicate (CMAS) corrosion behavior of LaPO4-YSZ thermal barrier coatings (TBCs) was investigated at 1250°C-1350°C for 4 hours. Corrosion was observed to occur primarily at the grain boundaries, and the corrosion depth increased with increasing temperature. The melt infiltration reaction layer formed after CMAS corrosion was primarily composed of ZrO2, residual CMAS, and La-apatite (Ca2+xLa8-x(SiO4)6-x(PO4)xO2), regardless of the temperature. It was worth noting that a continuous dense reaction layer was formed after the corrosion test at 1250 °C, which further delayed the infiltration of CMAS. However, the molten CMAS could infiltrate into the coating more easily when the temperature exceeds 1300 °C, leading to more severe corrosion. The results show that the CMAS corrosion behaviors of coating at different temperatures were primarily controlled by the infiltration and reaction processes;When temperatures exceed 1300°C, CMAS infiltration becomes the dominant process due to the reduced viscosity of the CMAS melt. © 2025, The Authors. All rights reserved.

关键词： Thermal barrier coatings

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Enhanced ablation performance of novel YAlSiO ceramics based on endothermic glass phase mechanism

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ceramics International 2025年

作者： Tianyi Xiang Duan Li Yanfei Wang Rongjun Liu Science and Technology on Advanced Ceramic Fibers and Composites Laboratory National University of Defense Technology Changsha 410073 PR China

High-temperature stability and oxidation resistance are crucial for electromagnetic materials used in harsh environment. Novel YAlSiO composite ceramics have been recently reported and are expected to have excellent overall performance. However, the ablation behavior and thermal protection mechanism are still unclear. In this paper, the ablation behavior and mechanism of YAlSiO ceramics which consist of Y 2 Si 2 O 7 and Al 2 O 3 were investigated by oxyacetylene flame test. The findings reveal that the linear and mass ablation rates for YAlSiO ceramics are significantly reduced by 38.4% and 36.4% compared with Y 2 Si 2 O 7 ceramics, respectively. The improvement in ablation resistance is primarily due to the heat absorption capacity of the endothermal reaction and the formed Y 2 O 3 -Al 2 O 3 -SiO 2 (YAS) glass. The endothermic reaction and the low thermal conductivity of the YAS glass significantly impede heat propagation. Additionally, the molten YAS glass effectively seals infects, creating stable interface bonds that further hinder the penetration of heat flux.

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Fabrication and Characterization of Porous Mullite ceramics from Pyrolysis of Alumina Powders Filled Silicone Resin

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Journal of Wuhan University of technology(Materials science) 2013年第6期28卷 1082-1084页

作者： MA Qingsong TIAN Hao Science and Technology on Advanced Ceramic Fibers &Composites Laboratory National University of Defense Technology

Porous mullite ceramics were fabricated from pyrolysis of nanometer alumina powders filled silicone resin. At 1573 K, the mixture of nanometer γ-Al2O3 and silicone resin can be entirely transformed to mullite in air. The effects of shaping pressure on microstructure and mechanical property were investigated. Increasing shaping pressure leads to decrease in open porosity and average pore size, narrower pore size distribution, and improvement in flexural strength. With a shaping pressure of 43 MPa, nanoporous mullite ceramics with an average pore size of 50 nm can be obtained, showing 33% in open porosity and 42 MPa in flexural strength. The microstructure of porous mullite ceramics consists of dense region and loose region.

关键词： porous ceramics mullite flexural strength pore structure

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Design and realization of a magnetic-type absorber with a broadened operating frequency band

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Chinese Physics B 2013年第1期22卷 384-388页

作者：周永江庞永强程海峰 Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace and Materials Engineering National University of Defense Technology

In this paper, we present an efficient method to obtain absorbers with broadened operating frequency bands. They are accomplished by using conventional magnetic absorbing materials （MAMs） in the forms of array and mesh structures, which are similar to those in the case of a frequency selective surface. The proposed approach is verified not only by simulations but also by experimental results under the normal incidence at microwave frequencies. Moreover, the wideband absorber is lighter than the conventional magnetic absorber. These results indicate that our proposed absorbing structures can be used for designing good electromagnetic absorbers.

关键词： magnetic absorbing material periodic structure bandwidth

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Formation of hierarchical Si3N4 foams by protein-based gelcasting and chemical vapor infiltration

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Journal of advanced ceramics 2021年第1期10卷 187-193页

作者： Junsheng LI Qiuping YU Duan LI Liang ZENG Shitao GAO Science and Technology on Advanced Ceramic Fibers and Composites Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

Silicon nitride foams with a hierarchical porous structure was formed by the combination of protein-based gelcasting,chemical vapor infiltration,and in-situ growth of silicon nitride *** porosity of the foams can be controlled at 76.3-83.8 vol%with an open porosity of 70.2—82.8 vol%.The pore size distribution was presented in three levels:<2μm(voids among grains and cross overlapping of silicon nitride nanowires(SNNWs)),10—50μm(cell windows),and>100μm(cells).The resulted compressive strength of the porous bodies at room temperature can achieve up to 18.0±1.0 MPa(porosity=76.3 vol%)while the corresponding retention rate at 800℃was 58.3%.Gas permeability value was measured to be 5.16(cm^(3)·cm)/(cm^(2)·s·kPa).The good strength,high permeability together with the pore structure in multiple scales enabled the foam materials for microparticle infiltration applications.

关键词： ceramics sintering porosity mechanical properties permeability

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