JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Fahai Dong,Nannan Zhu,Zhongya Zhang,Jiawei Jiang,Juhai Weng,Lijuan Zhang
This study successfully synthesized a novel SiCN ceramic precursor with high photosensitivity and ceramic yield through the addition reaction of Si-H and N-H groups in polysilazane (PSZ) with isocyanate groups in 2-isocyanoethyl methacrylate (IEM). The reaction mechanism between IEM and PSZ, and the curing and pyrolysis effects were investigated. The results showed that compared with 5 s exposure time, PSZ could not be cured, while the curing depth of PSZ could reach 1.51 mm after adding IEM chemical grafting modification, which significantly improved the curing printing efficiency. Increasing IEM content to 10 wt% reduced cure shrinkage from 13.85 % to 12.56 %, with a ceramic yield of 79.92 %. The bending strength of SiCN ceramic reached 30.7 MPa, and the microstructure of pyrolyzed samples was dense and free of defects. This research expands the application field of 3D-printed SiCN ceramics.
研究领域:
材料科学
·
高分子化学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhongya Zhang,Lijuan Zhang,Guangwu Wen,Yongzhao Hou,Nannan Zhu,Cheng Zhong,Jing Xue,Chuncheng Wei,Shuang Li
In this paper, polysilazane photocurable slurry with low viscosity and excellent rheological properties was prepared with β-Si 3 N 4 filler. Digital light processing (DLP) technique was utilised to form green bodies through optimized printing parameters. It was found that the introduction of β-Si 3 N 4 filler reduced the shrinkage and improved the mechanical properties of the polysilazane derived SiCN ceramics. The flexural strength of the resulted ceramics reached a maximum of 253.0 ± 15.1 MPa while 20 wt% of β-Si 3 N 4 powder was added, and the fracture toughness increased to 3.1 ± 0.3 MPa m 1/2 at 30 wt% of the β-Si 3 N 4 powder addition. The shape of the introduced β-Si 3 N 4 particles were believed to be faveriable for uniform dispersion in the printing slurry without agglomeration. In the following pyrolysis treament the β-Si 3 N 4 powders promoted the release of gaseous products so that maintained the structure integrety of the printed parts and the rod-like β-Si 3 N 4 particles enhanced the energy dissipation during ceramic fracture. In this study, silicon-based composite of β-Si 3 N 4 /SiCN ceramics with excellent mechanical properties were prepared by DLP additive manufacturing technology, which confirmed the feasibility and the great potential of photo-curing additive manufacturing technology in the manufacturing of SiCN ceramic matrix composites with complex structures.
研究领域:
材料科学
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Chang Liu,Kaidi Mao,Hang Teng,Rui Zhang,Haibin Sun,Qiangqiang Hu,Cuncheng Li,Hongyu Gong,Paolo Colombo,Xue Guo,Yurun Feng
This study demonstrates the electromagnetic simulation-guided additive manufacturing of SiCN ceramics with a gyroid architecture for enhanced microwave absorption. Rare earth (Ce, Pr) doping enables the precipitation of polarization-active SiC/C phases after low-temperature pyrolysis (900°C), synergistically optimizing impedance matching and electromagnetic energy dissipation. The optimized ceramics exhibit exceptional performance: GS-Ce900 achieves full X-band coverage at 3.86–4.07 mm thickness, while GS-Pr900 delivers a minimum reflection loss of −30.99 dB at 2.73 mm. Furthermore, under 60 s of electromagnetic irradiation, GS-Pr900 demonstrates an 84.3°C temperature decrease via thermoelectric conversion, showcasing strong infrared stealth potential.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Shan Wang,Hongyu Gong,M. Zeeshan Ashfaq,Desheng Qi,Pan Xu,Xigui Yue
In order to expand the application prospects of SiCN ceramics in the field of microwave (MW) absorption materials, a series of Ni 3 Si embedded SiCN ceramic fibers composites (NSF) were prepared by controlling Ni conversion rate through the electrospinning technique and polymer derivation, with the intention of improving the impedance matching degree, enhancing the conductivity and polarization, and further promoting the dielectric loss ability and MW absorption performance of ceramic materials. The microstructure, phase composition, conductivity, MW absorption properties and mechanism of the material were analyzed by a variety of characterization methods. The results show that NSF exhibited high dielectric loss efficiency and desirable effective absorption bandwidth (EAB) when the conversion rate of Ni was 0.5 wt%: The MW of the entire Ku band (12–18 GHz, 6 GHz) could be effectively absorbed by the sample with a thickness of 2.64 mm, and its EAB could cover 6–18 GHz by adjusting its thickness from 1 mm to 5 mm, so its performance is significantly superior to a number of similar SiCN based composite ceramic materials previously reported. To sum up, the NSF prepared in this work exhibits suitable impedance matching degree, good conductivity, obvious polarization effect, excellent dielectric loss ability, and gratifying EAB in MW, and it is expected to become a powerful candidate in the field of broadband MW absorption materials in the future.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Guiqin You,Daoyang Han,Huijie Tian,Junfang Liang,Chang-An Wang,Keke Yuan,Mingliang Li,Hailong Wang,Rui Zhang,Gang Shao
Mullite fiber heat insulation tile is extensively used in thermal protection system (TPS) of aircrafts due to its excellent thermal insulation and chemical stability. However, there is a lack of research on the design of its microwave absorption function, which can affect aircraft safety and service efficiency. In this study, mullite fiber felts were used as framework to impregnate polysilazane. After sol-gel and high-temperature pyrolysis processes, SiCN microwave absorption ceramics with 3D nano-network structure were prepared on mullite fibers (SiCN/mullite composites). By controlling pyrolysis temperature from 800°C to 1200°C, the microstructure, dielectric properties , and microwave absorption properties of SiCN/mullite composites in the range of 2–18 GHz were regulated. Findings show that when pyrolysis temperature was 1000°C, microwave absorption properties of SiCN/mullite composites were better. Their minimum reflection loss value reached −39.38 dB at 12.08 GHz and the absorption bandwidth almost covered the whole X-band. Therefore, microwave absorption function of mullite fibers based on heat insulation property is of strategic significance for TPS.
研究领域:
材料科学
·
航空工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Jie Liu,Chunmiao Liu,Yanchun Tong,Haibin Sun,Hui Peng,Mingwei Zhang,Shigang Wu,Hongying Zhang,Hongyu Gong,Zhiqin Zheng,Xue Guo,Yurun Feng
The SiCN/Fe/Ni ceramics codoped with iron acetylacetonate (FA) and nickle acetylacetonate (NA) was synthesized by polymer-derived ceramics (PDCs) method in this study. The microstructure, phase composition and electromagnetic wave (EMW) absorption properties of the samples were analyzed. The polarization loss and conduction loss of materials were analyzed by the direct current (DC) multimeter and the contribution rate of polarization loss was more than 94% in the whole frequency band. The results showed that C, SiC, Fe 2 Si, Ni 3 Si, γ- (Fe, Ni) and CNTs were formed after pyrolysis which provided lots of heterogeneous interface and enhanced the interfacial polarization. Meanwhile, Ni could enter the lattice of Fe and formed a unique electronic configuration, which reinforced the conductivity and stability of Fe. In addition, the in-situ generated Fe 2 Si and Ni 3 Si provided magnetic loss and conduction loss. The RL min value of SiCN/Fe/Ni-3 ceramic was −52.06 dB at 1.54 mm and the effective absorption band (EAB, RL ≤ −10 dB) reached 4.21 GHz (13.79–18 GHz, 1.43 mm).
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 18
·1-15
·
IF 2.8
Shi Haofan,Li Jinping,Zhang Gaoming,Meng Songhe
SiCN ceramic is a candidate material for high-temperature sensors because of its stability and semiconductor characteristics at high temperatures. The free carbon content within the SiCN ceramics is a main factor that affects its conductivity. This study adjusted the free carbon content inside amorphous SiCN by adding divinylbenzene into the precursor. The electrical properties of SiCN ceramics with different free carbon contents were explored using ultraviolet fluorescence spectrum and temperature-resistant experiments. The results showed that with the increase of divinylbenzene from 0 to 20%, the conductivity of SiCN ceramics at room temperature increases from 2.77 × 10 −9 to 3.66 × 10 −4 S/cm, and the forbidden bandwidth decreases from 3.81 to 2.25 eV. At the same time, the increase of divinylbenzene content would promote the hybridization extent of free carbon from sp 3 to sp 2 and improve the degree of order. This work could pave the way for applying amorphous SiCN serving as temperature sensors.
研究领域:
材料科学
·
半导体材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jimei Xue,Song Hu,Xiaoping Li,Fei Li,Yuqiang Liu,Hanjun Wei
Polymer derived SiCN ceramics (PDC SiCN) are the key high-temperature matrix materials for structural and stealth integrated ceramic matrix composites (CMC). However, low crystallization degree and homogeneous microstructure of PDC SiCN ceramics results in the lack of effective microwave attenuation mechanism. Hence, a new kind of nonmagnetic metal oxide (Y 2 O 3 ) was in-situ formed in SiCN ceramics to enhance the conductivity loss as well as the polarization loss. Y 2 O 3 modified PDC SiCN ceramics (SiCN-Y 2 O 3 ceramics) were fabricated by pyrolysis polysilazane with different Y(NO 3 ) 3 content at 900 ºC. For the SiCN-Y 2 O 3 ceramic, Y 2 O 3 nanoparticles were dispersed in SiCN ceramic uniformly forming a large number of Y 2 O 3 -SiCN heterogeneous amorphous interface, defects and dipole polarization to enhance its microwave absorbing properties. Due to the multiple polarization loss mechanism, SiCN-Y 2 O 3 ceramic with 10 wt% Y(NO 3 ) 3 content achieved excellent microwave absorption performance at a wide thickness range with the microwave absorbing efficiency more than 90% in the whole X band, and the RC min could reach − 50.2 dB at the thickness of 3.5 mm.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2023
·Vol. 106
·期 11
·6951-6961
·
IF 3.9
Yuangao Yan,Xuan Fei,Liuying Huang,Yuxi Yu,Yichen Wen,Gang Zhao
Hexagonal boron nitride (h-BN) with low dielectric loss and high temperature resistance opens up new opportunities for the preparation of polymer-derived SiCN ceramics (PDCs-SiCN ceramics) with excellent mechanical and dielectric properties. BN-containing polymer-derived SiCN composite ceramics (PDCs-SiCN(BN) composite ceramics) with different BN content were prepared via a pyrolysis process of ball-milling-blended Polyvinylsilazane/boron nitride (PVSZ/BN) precursors. BN is stably embedded in the SiCN tissue and tightly bound with it. The appropriate content of BN greatly improves the mechanical properties of PDCs-SiCN ceramics, as BN reduces the number of pores and prevents crack expansion. Additionally, BN is also beneficial in lowering the dielectric loss of PDCs-SiCN ceramics because of the weakened polarization relaxation behavior. PDCs-SiCN (BN) composite ceramics have optimal mechanical and dielectric properties when the BN content is 1 wt%. The flexural strength, flexural modulus and compression strength of PDCs-SiCN(BN) composite ceramics with 1 wt% BN doping content were 189.37 MPa, 46.38 GPa, and 399.02 MPa, respectively. Its average dielectric loss (tanδ ε ) at 12.4-18 GHz is 0.0049.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Keke Yuan,Daoyang Han,Wanyu Zhao,Weiwei Zhang,Guiqin You,Mingliang Li,Bingbing Fan,Hongxia Lu,Hailong Wang,Hongliang Xu,Gang Shao,Rui Zhang
In the present work, polymer-derived SiCN ceramic aerogels (PDCA-SiCN) were fabricated via a combined sol-gel/freeze drying/polymer precursor conversion method. The microstructure of PDCA-SiCN was studied by regulating the synthesis temperature and time during the sol-gel process. PDCA-SiCN showed a unique three-dimensional network structure, and the specific surface area and pore size of PDCA-SiCN prepared at 150 °C for 20 h were 134 g/m 2 and 18 nm, respectively. To assess the electromagnetic wave absorption (EMA) properties of PDCA-SiCN, the materials were uniformly blended with common paraffin, and the influence of PDCA-SiCN/paraffin ratio on the EMA properties was also investigated. The sample with a PDCA-SiCN/paraffin ratio of 20:80 exhibited the best EMA performance, with a minimum reflection loss (RL) of −43.37 dB at 7.6 GHz and electromagnetic absorption bandwidth of 3.8 GHz, which correspond to an absorption of 99.99 % of the electromagnetic waves. The excellent EMA properties of PDCA-SiCN could be attributed to a synergistic effects of good impedance matching, multiple reflections and high dielectric loss.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 73
·46215-46220
·
IF 3.108
Youzhi Wang,Yurun Feng,Xue Guo,Yu Liu,Hongyu Gong
Fe-doped polymer-derived SiCN ceramics were synthesized by a precursor conversion method with different contents of nano-Fe2O3. The phase composition and microstructure were characterized by XRD, SEM and TEM. The results revealed that α-Fe and graphite phases were generated during the synthetic process. The electromagnetic and wave absorbing properties of the Fe-doped SiCN ceramics were analyzed with different amounts of nano-F2O3 over the frequency range of 2–18 GHz. The existence of α-Fe and graphite phases improved the electromagnetic properties of the materials greatly. The reflectance and electromagnetic attenuation coefficient of Fe-doped SiCN ceramics (15 wt% F2O3) reached −11 dB and 325 at 10.5 GHz, respectively, which indicated that the Fe-doped SiCN ceramics possessed excellent absorbing properties.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 4
·2593-2602
·
IF 2.1
Guiqin You,Daoyang Han,Huijie Tian,Junfang Liang,Chang-An Wang,Keke Yuan,Jilin He,Mingliang Li,Hailong Wang,Rui Zhang,Gang Shao
Polymer-derived ceramic materials exhibit adjustable composition, microstructure, and dielectric properties and are widely used as high temperature microwave absorption materials in the aerospace field. In this study, polymer-derived SiCN ceramic aerogels with excellent electromagnetic wave absorption (EMA) properties were successfully fabricated through a combination of the sol-gel, freeze- drying, and polymer precursor conversion methods. The hydrosilylation reaction between the Si-H bond in polysilazane (a polymer ceramic precursor) and the C = C bond in divinylbenzene (a cross-linking agent) occurs to form a wet gel. The effects of the molar ratios of the two bonds (C = C/Si-H) on the microstructure and EMA properties of the SiCN ceramic aerogels were systematically studied. At a C = C/Si–H molar ratio of 1.25:1, the minimum reflection loss of the SiCN ceramic aerogels is −37.57 dB at 10.88 GHz. Moreover, the corresponding effective absorption bandwidth covers almost the entire X-band, showing excellent EMA properties.
研究领域:
材料科学
·
航空航天工程
✓ 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）