CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Jian Meng Jiao,Kai Tang,Jafar Safarian,Bettina Grorud,Kathrine Sellevoll,Merete Tangstad
Si 3 N 4 is a candidate crucible material for Si–B alloys in high temperature thermal energy storage system. In this regard, the phase formation in the Si–B alloys and the interaction between the alloys and Si 3 N 4 were investigated in an induction furnace at 1750 °C with the B addition of 2, 5, 8, and 11 mass %, respectively. Moreover, the wettability property of the Si-3.25B alloy (mass %) on Si 3 N 4 substrate was examined at temperatures up to 1400 °C. The cross-sectional images and micro-analyses showed that BN precipitates were produced in the Si–B alloys and a BN layer was formed at the interface between the Si–B alloys and Si 3 N 4 . However, the amount of BN precipitates was negligible. Next, the equilibrium contact angle of liquid Si-3.25B alloy on Si 3 N 4 substrate was determined to be 134 ± 1°, which indicates non-wetting behavior. The above results support that Si 3 N 4 is a desirable refractory material for the high temperature thermal energy storage system.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Jieyan Zhao,Qing Meng,Yong Li,Zengchao Yang,Jiangtao Li
Radiative cooling enables the passive cooling of buildings without energy input. Structural radiative cooling materials, such as cellulose-based composites, have recently received extensive attention due to their exceptional mechanical properties and spectral selectivity. However, the cellulose-based materials face challenges in durability and flame resistance, which limits their practical application. Herein, a structural porous Si3N4–BN ceramic with a high solar reflectivity of ∼0.95 and an atmospheric window emissivity of ∼0.95 was prepared by one-step combustion synthesis. The porous ceramic achieves a subambient radiative cooling performance of 5.14 °C under direct sunlight and theoretically yields a cooling power of 78.55 W m–2. The network structure of Si3N4 crystals leads to a flexural strength of 31.07 MPa and a compressive strength of 65.36 MPa. The porous Si3N4–BN ceramics with excellent radiative cooling performance, mechanical properties, and thermal insulation exhibit wide application prospects in building cooling, especially in the harsh environment of tropical desert and island regions.
研究领域:
材料科学
·
建筑工程
·
环境科学
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DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chengzhi Xu,Haiyuan Zhang,Xiaodong Li,Jiakai Cao,Lei Yang,Gang He
Fabrication of high density silicon nitride (Si 3 N 4 ) ceramics by ultrafast high-temperature sintering remains challenges due to the decomposition of Si 3 N 4 under high temperature at atmospheric pressure. Herein, a gas-pressure assisted ultrafast high-temperature sintering (G-UHS) was developed for the preparation of Si 3 N 4 ceramics. The effects of sintering temperature (T), heating rate (HR), nitrogen pressure (P), holding time (t), and Y 2 O 3 -MgO composite sintering aids on the mass loss, oxygen content, phase evolution, and microstructure of Si 3 N 4 ceramics were systematically investigated. The densification mechanism during ultrafast high-temperature sintering was further elucidated by thermodynamic analysis in terms of mass loss and oxygen content changes. It was found that under atmospheric pressure, the mass loss during the ultrafast high-temperature sintering process first originates from the decomposition of silicon oxynitride generated by the reaction between silicon oxide on the powder surface and internal Si 3 N 4 , followed by the direct decomposition of Si 3 N 4 . Increasing the gas pressure can effectively inhibit the decomposition of Si 3 N 4 and the volatilization of liquid-phase sintering aids, thereby promoting the densification of Si 3 N 4 ceramics. It was indicated that under ultrafast high-temperature sintering, the rapid formation of rod-like crystal structure by α/β phase transition through dissolution and precipitation inhibits particle rearrangement and restricts the densification of Si 3 N 4 ceramics. Si 3 N 4 ceramics with a relative density of 94.17% were successfully prepared under the optimal sintering conditions (sintering temperature 1750 °C, nitrogen pressure 0.2 MPa, heating rate 50 °C/s, holding time 180 s) with the addition of 4 wt% Y 2 O 3 and 6 wt% MgO. This study can provide useful guidance for the optimization of the ultrafast high-temperature sintering process of high performance Si 3 N 4 ceramics.
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DOI
高影响因子
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
·
2016
·
IF 2.264
Ping Hu,Shun Dong,Cheng Fang,Yuan Cheng,Boqian Sun,Guiqing Chen
The composition and morphology of obtained products depended on the processing atmosphere using the raw materials of nanosilicon, nanosilica and graphite, with N 2 -generating several millimeters long single-crystal Si 3 N 4 nanobelts (NBs) and Ar SiC nanobelts . The width and thickness of in situ NBs ranged from 100 to 300 nm and 50–100 nm with an average width of 196 nm, while the width and thickness of ex situ NBs fluctuated from 150 to 500 nm and 80–200 nm with an average width of 436 nm. Alumina-assisted VS mechanism was proposed for the growth mode of in situ growth of Si 3 N 4 nanobelts, while a combined mechanism involving VS and VLS was controlled the growth of Si 3 N 4 nanobelts obtained on the inner walls of the crucible due to the presence of Fe 2 O 3 , which provides an effective means of fabricating ultra-long Si 3 N 4 nanobelts on an industrial scale.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Ningning Dong,Yuan zhang,Jinwei Guan,Li Guo,Lu Liu,Liuxin Chao,Li Yang,Wei Zheng,Zhengming Sun,Guobing Ying
Preeminent mechanical and dielectric performances are demonstrated by covalently bonded Si 3 N 4 ceramics, yet their application range is still challenged because of limited toughness and sintering density. In this work, the Si 3 N 4 f /BN i fibrous monolithic ceramic with uniaxially arranged Si 3 N 4 fibers cells separated by BN interfaces were successfully synthesized via hot-pressed sintering based on bionic structural design. The Si 3 N 4 f /BN i fibrous monolithic ceramics with bionic structure exhibited flexural strength, fracture toughness, and density of up to 501 MPa, 10.99 MPa m 1/2 , and 3.43 g/cm 3 , respectively. The results revealed that bionic structural design enables to significantly increase the toughness of the ceramic without sacrificing its strength. Furthermore, an original model for determining the flexural strength of fibrous monolithic ceramics was proposed, which can account for various shapes of fibrous cells. The findings of this research open up new prospects for achieving competitive mechanical performance of ceramics.
研究领域:
材料科学
·
力学
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DOI
高影响因子
MATERIALS & DESIGN
·
2024
·
IF 7.6
Yunwei Shi,Jinghan Wang,Yichao Ren,Aiyang Wang,Qianglong He,Yanbo He,Hao Wang,Weimin Wang,Zhengyi Fu
The grain preferential orientation has a significant influence on the mechanical properties of silicon nitride (Si 3 N 4 ) ceramics. Based on the Jeffery’s theory, a grain rotation model under uniaxial compression is created to predict the texture evolution mechanism during sintering of Si 3 N 4 ceramics. With deformation, the grain orientation was predicted to rotate towards the plane perpendicular to the pressure direction, and large strain was favorable for the formation of strong texture. According to guidance of the model, the weakly textured microstructure prepared by normal hot pressing is attributed to the limited strain, due to the constrains of graphite die. Therefore, a new PHIP (pseudo-hot isostatic pressing) process with the large deformation is guided to fabricate the strongly textured ceramics by promoting the grain rotation and dynamic grain growth. Generally, the experimental results are well accordance with the model prediction. Furthermore, this model could be applied to guide the design and fabrication of other isotropic and anisotropic ceramic materials.
研究领域:
材料科学
·
陶瓷工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Chengzhi Xu,Lei Yang,Jieliang Su,Jianping Zhang,Jiakai Cao,Xiaodong Li,Gang He,Zhanggui Hu
Silicon nitride (Si 3 N 4 ) with α -phase content ∼90.0 wt% and oxygen content ∼1.00 wt% was prepared by combustion synthesis method using recycled silicon waste from photovoltaic industry. The effects of reaction pressure and environmentally-friendly new additive C 3 H 6 N 6 on the phase composition, and morphology and reaction mechanism of the combustion synthesized α -Si 3 N 4 powder were studied. The results indicate that a lower N 2 pressure is conducive to increasing the α -phase content and reducing the oxygen content of the Si 3 N 4 powder. The addition of C 3 H 6 N 6 as an effective additive facilitates the deoxidation and nitridation reactions of recycled silicon waste, which further increases the α -phase content and reduces the oxygen content of the Si 3 N 4 powder. This work demonstrated that the recycled silicon waste from photovoltaic industry holds great promise to be used as the silicon source for the cost-effective synthesis of high quality α -Si 3 N 4 powder.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zhe Wang,Zhenkai Mu,Xuye Wang,Wei Wang,Xuerui Dai,Shibo Ma,Xinni Zhang
Vat photopolymerization technology has garnered significant attention in the field of ceramic additive manufacturing due to its high precision and efficient forming capabilities. However, a fundamental challenge remains in balancing the curing depth and printing accuracy during the fabrication of Si 3 N 4 ceramics. To address this issue, this study proposes a novel strategy for the synergistic modulation of slurry optical properties via the integration of a photoinitiator (PI, Irgacure 819), a UV absorber (UA, UV-531), and an oxygen scavenger (OI, BHT). Through a full-factorial experimental design, a multivariate nonlinear model was established. The results demonstrate that the photoinitiator (PI) enhances the polymerization efficiency by generating reactive radicals under UV exposure, while the UV absorber (UA) suppresses lateral over-curing by increasing the ultraviolet absorption coefficient, and the oxygen scavenger (OI) mitigates oxygen-induced inhibition of polymerization. The synergistic effects of these three additives maintain the curing depth within the range of 67.3–86.7 μm, while significantly improving the printing accuracy of submillimeter-scale microholes. The relative errors for square holes ranging from 200 to 500 μm were reduced to less than 2 %. The optimized slurry formulation ensures sufficient curing depth while markedly enhancing printing precision, enabling the rapid fabrication of high-resolution complex structures. This work provides a solid foundation for the advancement of vat photopolymerization of silicon nitride ceramics.
研究领域:
材料科学
·
陶瓷增材制造
·
光聚合化学
·
精密制造
·
功能陶瓷
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Lei Han,Longhao Dong,Faliang Li,Hongjuan Duan,Haijun Zhang,Guangqiang Li,Quanli Jia,Shaowei Zhang
Recently, high-performance ceramic aerogels (CAs) have become a research hotspot because of their multi-functional properties. Compared to their oxide counterparts, non-oxide CAs show better thermal shock resistance and other high-temperature properties, making them suitable for applications in harsh environments. In this work, Si 3 N 4 -BC x N-TiN ceramic aerogels (SBCNT CAs) with molar ratios of B/C/Si/Ti = 2:1:5:5 were synthesized at 1623 K for 3 h via foam-gelcasting, from Si, Ti, melamine and boron acid raw materials. The prepared SBCNT CAs containing 91.0% porosity exhibited the highest compressive strength up to 1.0 MPa, and thermal conductivity of 0.144 W/(m·K) at 298 K. They also exhibited excellent service performance at 1473 K in Ar, demonstrating their great potential for high-temperature applications.
研究领域:
材料科学
·
无机非金属材料
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产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2022
·
IF 9.417
Dandan Wu,Chengyong Wang,Xiaoyue Hu,Wanglin Chen
A novel composite materials using silicon nitride (Si 3 N 4 ) as the substrate and diamond particles as the reinforcement phase were developed to increase both thermal conductivity and mechanical properties. The Ti coating on the surfaces of the diamond particles facilitated the formation of a titanium carbonitride (TiC i N 1-i ) interface between the two constituents during sintering, creating a strong bonding for high thermal conduction at the diamond-Si 3 N 4 interface and inhibiting the graphitization of diamond during the sintering process. Furthermore, a sandwiched material design was made whereby Si 3 N 4 and Si 3 N 4 /Ti-coated diamond layers were stacked alternately to endow the composites with a directional heat conduction characteristic. The thermal conductivity of the fabricated Si 3 N 4 /diamond composites increased by up to 272.87 % compared to that of commercially available Si 3 N 4 , making them excellent candidates for thermal management materials required in high-performance electronic devices.
研究领域:
材料科学
·
热管理工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Materials Research
·
2024
·Vol. 115
·期 6
·391-399
·
IF 0.7
Haiqing Li,Yanru Wang,Runze Liu,Shuming Wang
Due to their special structure and many excellent properties, porous Si 3 N 4 ceramics have a wide range of potential applications as a new structural and functional integrated material. In the present study, porous Si 3 N 4 ceramics with excellent bending properties and satisfactory porosity were prepared by the gel-casting method. The variations in porosity, bending strength, fracture morphology and phase composition of the porous Si 3 N 4 ceramics with different weight fractions of La 2 O 3 –MgO sintering additive were investigated. The results showed that the density of porous Si 3 N 4 ceramics increased linearly with the increase of sintering additive content. When the content of sintering additive increased from 2.5 wt.% to 10 wt.%, the porosity of porous ceramics decreased from 30 % to 10 %. With the increase of sintering additive content, the bending strength of the samples first increased and then decreased. When the sintering additive content was 5.0 wt.%, the average bending strength of the samples reached a maximum of 240.88 MPa, and scanning electron microscopy and X-ray diffractometry results showed that β-Si 3 N 4 particles with well-developed pores and a maximum aspect ratio of 5.8 were formed in the porous silicon nitride ceramics. This study provides a reference for the preparation of porous Si 3 N 4 ceramics with good bending properties and porosity.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
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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DOI
高影响因子
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