JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2026
·Vol. 109
·期 7
·e71019
·
IF 4.2
Fuhao Xu,Mengcheng Nie,Jian Ren,Yong Kong,Xiaodong Shen,Gaofeng Shao
Structure-function integrated ceramic aerogels that offer mechanical strength, high-temperature stability, wave transparency, and thermal insulation are vital for aerospace radomes and protective systems. Herein, Si 3 N 4 ceramic aerogels were prepared by a carbothermal reduction−nitridation of pre-densified resorcinol–formaldehyde/silica hybrid aerogel powder. Benefiting from an interconnected skeleton and optimized crystallization, the Si 3 N 4 aerogel exhibits a high compressive strength of 48 MPa with a density of 1.02·g cm −3 . Meanwhile, it achieves a low dielectric constant of 2.19–2.36 with ultralow dielectric loss (5.4×10 −3 –9.6×10 −3 ) in the range of 2–18 GHz and a low thermal conductivity (0.0344 Wm −1 ·K −1 at 25°C), ensuring excellent electromagnetic wave transparency and thermal insulation. Ablation tests confirm improved oxidation resistance and structural integrity. This unique combination of properties highlights Si 3 N 4 aerogels as promising candidates for next-generation aerospace radomes and multifunctional components operating in harsh environments.
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高影响因子
CERAMICS INTERNATIONAL
·
2018
·
IF 3.057
Jia Hongsheng,Li Jiaqi,Niu Rui,Ye Chaochao,Ru Hongqiang,Liu Baochang,E. Yuanlong,Li Haibo
In this work, the Silicon nitride composite ceramics (β-Si 3 N 4 ) by ultra-high pressure sintering were investigated. And the effect of sintering temperature , hold time and α-Si 3 N 4 powders on the sintering process had been analyzed in detail. These experimental results showed the larger particle size and lower porosity had an obvious effect on the thermal conductivity . Meanwhile, the addition of α-Si 3 N 4 powder could be also attributed to thermal conductivity. We had been calculated the porosity of β-Si 3 N 4 composite ceramics that the sample D (0.26%) was lower than the others samples. For a comparison, the thermal conductivity of sample D was up to 64.6 W/m K that was also attributed to its higher diffusion rate and small grain size.
研究领域:
材料科学
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热传导工程
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高影响因子
NANO
·
2015
·
IF 1.09
HUI ZHU,PENG CHEN,RU XIA,JIASHENG QIAN,JIBIN MIAO,BIN YANG,LIFEN SU
Poly(methyl methacrylate)-b-poly(vinyltriethoxysilane) (PMMA-b-PVTES) are synthesized using atom transfer radical polymerization (ATRP) and used as macromolecular coupling agents to modify silicon nitride nanoparticles (nano- Si 3 N 4 ). The chemical composition of copolymers PMMA-b-PVTES and modified nano- Si 3 N 4 are confirmed by various characterization techniques. The modified nano- Si 3 N 4 shows excellent hydrophobic nature, which make nanoparticles (NPs) stably disperse in organic solvent. Transmission electron microscope (TEM), particle size testing, contact angle measuring and sedimentation experiment are employed to examine the dispersion of modified nano- Si 3 N 4 in chloroform. By comparing the effects of copolymers with varied number-average molecular weight (M n ) and block length ratio on stabilizing nano- Si 3 N 4 , we discussed the mechanism of macromolecular coupling agent stabilizing NPs. In our experiments, the copolymer PMMA 88 -b-PVTES 17 is found to be the most effective macromolecular coupling agent for stabilizing nano- Si 3 N 4 .
研究领域:
材料科学
·
高分子化学
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高影响因子
Nano Research
·
2023
·
IF 9.9
Tong Zongwei,Yan Xiangjie,Wang Yuexiang,Li Kexun,Ma Weihai
Increasing porosity is one of the most direct ways to improve the thermal insulation and dielectric properties of materials. Until now, many wet methods for preparing Si 3 N 4 ceramic foams usually face the problems of complex rheology, long period, and expensive cost, and the reported pore sizes of Si 3 N 4 ceramic foams are typically micron-grade, resulting in a lack of competitiveness in thermal insulation and wave-transparent applications. In this paper, the Si 3 N 4 @SiO 2 ceramic foams were prepared using an efficient dry-method, which combined three processes of low temperature chemical vapor deposition (LTCVD), template, and isostatic pressing. The method has the advantages of simple operation and short preparation period, and can realize near-net size molding and mass production. In addition, the evolution mechanisms of honeycomb microstructure and composition of Si 3 N 4 @SiO 2 ceramic foam during sintering were studied by chemical reaction thermodynamics. The as-prepared Si 3 N 4 @SiO 2 ceramic foam possesses low density (0.377 g·cm −3 ), high compressive strength (7.5 MPa), low thermal conductivity (0.0808 W·m −1 ·K −1 ), and excellent dielectric properties ( ε < 1.32, tan δ < 0.009) in the frequency range of 8–18 GHz, and its maximum working temperature in air can reach up to 1100 °C. It will be recommended to be applied in the interlayer of Si 3 N 4 ceramic radome to improve its thermal insulation and electromagnetic wave transparency performances.
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高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Yuelong Wang,Jianjun Tian,Haoyang Wu,Baorui Jia,Xingyu Li,Yiming Zhang,Zhirui Zhang,Xuanhui Qu,Mingli Qin
Si 3 N 4 ceramics were prepared using novel two-step sintering method by mixing α -Si 3 N 4 as raw material with nanoscale Y 2 O 3 –MgO via Y(NO 3 ) 3 and Mg(NO 3 ) 2 solutions. Si 3 N 4 composite powders with in situ uniformly distributed Y 2 O 3 –MgO were obtained through solid–liquid (SL) mixing route. Two-step sintering method consisted of pre-deoxidization at low temperature via volatilization of in situ-formed MgSiO 3 and densification at high temperature. Variations in O, Y, and Mg contents in Si 3 N 4 –Y 2 O 3 –MgO during first sintering step are discussed. O and Mg contents decreased with increasing temperature because SiO 2 on Si 3 N 4 surface reacted with MgO to form low-melting-point MgSiO 3 compound, which is prone to volatilize at high temperature. By contrast, Y content hardly changed due to high-temperature stability of Y–Si–O–N quaternary compound. In the second sintering step, skeleton body was densified, and the formation of Y 2 Si 3 O 3 N 4 secondary phase occurred simultaneously. Two-step sintered Si 3 N 4 ceramics had lower total oxygen content (1.85 wt%) than one-step sintered Si 3 N 4 ceramics (2.51 wt%). Therefore, flexural strength (812 MPa), thermal conductivity (92.1 W/m·K), and fracture toughness (7.6 MPa⋅m 1/2 ) of Si 3 N 4 ceramics prepared via two-step sintering increased by 28.7%, 16.9%, and 31.6%, respectively, compared with those of one-step sintered Si 3 N 4 ceramics.
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高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Yao Liu,Lina Zhan,Yu He,Jun Zhang,Jianjun Hu,Lijin Cheng,Qiumei Wu,Shaojun Liu
Photocurable gray-colored Si 3 N 4 ceramic slurry with high solid loading, suitable viscosity and high curing depth is critical to fabricate dense ceramic parts with complex shape and high surface precision by stereolithography technology. In the present study, Si 3 N 4 ceramic slurry with suitable viscosity, high solid loading (45 vol %) and curing depth of 50 μm was prepared successfully when surface modifier KH560 (1 wt%) and dispersant Darvan (1 wt%) were used. The slurry exhibits the shear thinning behavior. Based on the Beer-Lambert formula, D p ( the attenuation length) and E c (the critical energy dose) of Si 3 N 4 ceramic slurry with solid loading of 45 vol % were derived as 0.032 mm and 0.177 mJ/mm 2 , respectively. Si 3 N 4 ceramic green parts with complex shape and high surface precision were successfully fabricated by stereolithography technology. After optimizing the debinding and sintering process for green parts, dense Si 3 N 4 ceramics with 3.28 g/cm 3 sintering density were fabricated. The microhardness and fracture toughness of as-sintered Si 3 N 4 ceramics are ~14.63 GPa and ~5.82 MPa m 1/2 , respectively, which are comparable to those of the samples by traditional dry-pressed and pressureless sintering technology. These results show that ceramic stereolithography technology could be promising to fabricate high performance ceramics, especially for gray-colored monolithic Si 3 N 4 ceramics.
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高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Jianning Zhang,Yanpei Dang,Tianhao Li,Yangzhong Zhao,Liantai Duan,Ke Chen,Xiao Zhang,Hengli Duan,Wensheng Yan,Sihua Feng,Gang Shao,Zhaoju Yu,Qing Huang,Yujie Song
Silicon boron carbonitride (SiBCN) ceramics have garnered significant attention due to their exceptional high-temperature stability, resistance to creep, and favorable electrical properties. However, the ceramicization mechanism of covalently bonded boron atoms in polyborosilazane (PBSN), which is crucial in determining the structural and crystalline phase evolution of silicon boron carbonitride (SiBCN) ceramics through the polymer-to-ceramic process, still needs further clarification for the design of advanced ceramics. Therefore, PBSN precursors constructed with B–C bonds were systematically investigated in the polymer-to-ceramic conversion process. B–C bonds were transformed into B-N bonds between 300°C and 600°C, ultimately resulting in the formation of h-BN at high temperatures. Meanwhile, higher levels (8.11–14.12%) of B facilitated the formation of SiC at equivalent temperatures but hindered the formation of Si 3 N 4 crystal nuclei. That is due to the formation of B–N and NB 3 units, which inhibited the formation of Si–N bonds and SiN 4 units, thereby interfering with the nucleation process of Si 3 N 4 and facilitating the crystallization of SiC. This study offers valuable insights for regulating the microphase evolution and properties of PDC nanocomposites.
研究领域:
材料科学
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陶瓷材料
·
聚合物衍生陶瓷
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固态化学
·
高温材料
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高影响因子
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2017
·Vol. 43
·期 2
·151-155
·
IF 1.908
Na Sun,Zhenggang Xiao
A morphologically stable silicon oil microcapsule base polystyrene as shell modified with TiO 2 and Si 3 N 4 nanoparticles was synthesized, characterized and applied as an inhibitor for high energy propellant to reduce erosion of gun barrel. The composite microcapsules were obtained by an eco-friendly method. Embedding heat-resistant TiO 2 and Si 3 N 4 nanoparticles in polystyrene shell enhances the reliability of polymeric shell. The anti-erosion effect of composite microcapsules for high energy propellant was investigated by using an erosion tester. Results showed that the erosion property of high energy propellant with composite microcapsule was significantly decreased when compared to control sample (without microcapsules). It showed a decrease of 20.6 % in erosion mass when 7 wt.% of composite microcapsules were added to the high energy propellant. Moreover, the anti-erosion efficiency of composite additives exhibited an increasing trend with the increase of their contents. The pressure and time history confirmed that the composite microcapsules also have ability to adjust the combustion performance of high energy propellants. The developed silicon oil microcapsule shows a potential application for propellant erosion additive.
研究领域:
材料科学
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化学工程
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Binbin Fan,Tianci Wang,Dengke Zhao,Bohan Wang,Shuo Zhao,Shijia Zhang,Zhipeng Xie,Kexin Chen,Guanghua Liu
To achieve high-performance Si₃N₄ ceramics for advanced thermal management, this study proposes a synergistic strategy that integrates initial particle gradation with Y 2 O 3 /MgO additive ratio to guide grain growth and microstructure evolution. A bimodal powder blend enhances green body densification and promotes the development of elongated β-Si₃N₄ grains through localized dissolution–precipitation. Simultaneously, an intermediate Y 2 O 3 /MgO ratio effectively modulates the liquid-phase viscosity and interfacial wetting, enabling controlled anisotropic grain growth while suppressing amorphous boundary phases and oxygen impurity. The optimized sample exhibits a refined bimodal microstructure with 20.8 % of grains > 8 μm and a maximum mean aspect ratio of ∼2. This tailored microstructure underpins its outstanding thermal conductivity (124 W·m⁻¹·K⁻¹), flexural strength (708 ± 10 MPa), and fracture toughness (9.0 ± 0.5 MPa·m 1/2 ). These results highlight the effectiveness of co-optimizing powder characteristics and additive chemistry to engineer grain architecture and achieve simultaneous enhancement of thermal and mechanical properties in Si₃N₄ ceramics.
研究领域:
材料科学
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陶瓷工程
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热管理
·
显微结构设计
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高影响因子
CERAMICS INTERNATIONAL
·
2023
·Vol. 49
·期 11
·19281-19289
·
IF 5.2
Jianwei Sun,Qiang Jing,Liwen Lei,Jinyong Zhang
Residual stress greatly affects the mechanic performance of the functionally graded materials (FGM). The residual stress distributions in different Si 3 N 4 /SiC FGMs formed in the fabricating processes were investigated with X-ray diffraction method in this work. It's found that residual stresses in FGMs with different component gradients were the gradient function of the quadratic of the component content and mainly determined by gradual changes of thermal mismatch and elastic modulus caused by the component content gradient. And the maximum tensile strength of FGM was limited by the ultimate tensile strength or shearing strength of SiC . When the maximum tensile strength exceeded the ultimate tensile strength or shearing strength of SiC and the maximum residual stress was maintained within the ultimate limit and resulted in the newly balanced stress distribution due to the same gradient function, cracks were formed. These results obviously provide ideas for regulating the performance and designing the FGM gradient for some special applications.
研究领域:
材料科学
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陶瓷
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机械工程
·
复合材料
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高影响因子
Applied Sciences-Basel
·
2020
·Vol. 10
·期 18
·6438
·
IF 2.474
Xingbang Li,Jingxian Zhang,Yusen Duan,Ning Liu,Jinhua Jiang,Ruixin Ma,Hongan Xi,Xiaoguang Li
Among a series of 3D printing techniques, stereolithography provides a new route to produce ceramic architectures with the advantages of high-precision and short cycle time. However, up to now the stereolithography of non-oxide ceramics still face complex and difficult problems. This work focused on the analysis of rheological and curing ability of Si3N4photocurable slurries. The effects of monomer type, coarse silicon powder, solid loading and ambient temperature on the rheological behavior were intensively studied. The relationships between powder characteristic (involving refractive index, absorbance and the introduce of coarse silicon powder), monomer type and curing ability were discussed in detail. It is expected that this study may benefit the development of Si3N4or other non-oxide ceramic slurries for stereolithography.
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高影响因子
Journal of Water Process Engineering
·
2024
·
IF 6.3
Yun-fei Zhang,Xin Quan,Sheng-gui Chen,Jian-hui Xu,Dan Li,Lei Li,Si-hao Lv,Jin-ze Li,Yi-hang Zhang,Zhuo-wei Zhong
In this study, silicon nitride-zero-valent iron (Si 3 N 4 -ZVI) powders were obtained through post-milling and employed as a catalyst to activate peracetic acid (PAA) for the removal of Ranitidine (RAN). The system achieved an impressive 90.4 % of degradation efficiency, with a pseudo-first-order kinetic reaction constant 11.3 times higher than that of the ZVI/PAA system. Quenching experiments and Electron Paramagnetic Resonance (EPR) analysis confirmed that both radical and non-radical processes are involved in RAN degradation within the Si 3 N 4 -ZVI/PAA system. Moreover, the identified ten degradation products are less toxic compared to the byproducts from alternative oxidation methods reported by prior literature. The proposed degradation pathway of RAN includes C S cleavage, oxygenation/hydroxylation demethylation, and denitrification. Furthermore, the Si 3 N 4 -ZVI/PAA system showed effectively in treating RAN-contaminated surface water, artificial wastewater, and dissolved organic matter, demonstrating its great ability in treating diverse organic-contaminated water sources. In conclusion, results of this study suggest that the Si 3 N 4 -ZVI/PAA system possess high pollutant removal efficiency, broad applicability, and less environmental and health risks.
研究领域:
环境科学
·
水处理工程
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高影响因子
危险品化学品经营许可证（带存储）