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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JOURNAL OF ALLOYS AND COMPOUNDS
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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
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显微结构设计
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Shengjun Liao,Lijuan Zhou,Changxi Jiang,Jianjun Wang,Yinghua Zhuang,Shuang Li
Silicon nitride (Si 3 N 4 ) ceramics were fabricated by gas pressure sintering (GPS) using four sintering additives: Y 2 O 3 –MgO, Y 2 O 3 –MgF 2 , YF 3 –MgO, and YF 3 –MgF 2 . The phase composition, grain growth kinetics, mechanical properties, and thermal conductivities of the Si 3 N 4 ceramics were compared. The results indicated that the reduction of YF 3 on SiO 2 , induced a high Y 2 O 3 /SiO 2 secondary phase ratio, which improved the thermal conductivity of the Si 3 N 4 ceramics. The depolymerization of F atom reduces the diffusion energy barrier of solute atom and weakens the viscous resistance of anion group, which was beneficial to grain boundary migration. Besides exhibiting a lower grain growth exponent( n = 2.5)and growth activation energy ( Q = 587.94 ± 15.35 kJ/mol), samples doped with binary fluorides showed excellent properties, including appreciable thermal conductivity (69 W m −1 K −1 ), hardness (14.63 ± 0.12 GPa), and fracture toughness (8.75 ± 0.18 MPa m 1/2 ), as well as desirable bending strength (751 ± 14 MPa).
研究领域:
材料科学
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陶瓷工程
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PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
·
2024
·Vol. 221
·期 16
·2400121
·
IF 1.9
Xiaoli Ji,Ruochen Qiao,Zhihao Xu,Jian Liu,Haoze Yuan
Herein, multiwalled carbon nanotube (MWCNT)/silicon nitride (Si 3 N 4 )/polyaniline (PANI) ternary composites are prepared. The preparation method involves attaching carboxyl groups to acid-modified MWCNT surfaces and amino groups to Si 3 N 4 surfaces modified using a silane-coupling agent. Then they are combined to binary composites using the solvent-thermal method. Finally, the ternary composites are prepared by coating PANI on the surface of MWCNT/Si 3 N 4 composites in situ polymerization. The morphology and structure of these composites are characterized through X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, and X-ray photoelectron spectroscopy. Results show that the reflection loss at 8.8 GHz reaches −42.57 dB when the feeding ratio of MWCNT:Si 3 N 4 :PANI is 3:20:40 and the corresponding effective absorption bandwidth reaches 4.06 GHz when the thickness is 3.5 mm. A conductive network with effective electron leaps is formed among MWCNT, Si 3 N 4 , and PANI, which increases the conductive loss of the composites. An abundant number of interfaces have formed in the composite materials and promoted dielectric loss. Multiple loss mechanisms and good impedance matching performance endow MWCNT/Si 3 N 4 /PANI with excellent microwave absorption performance, and the incorporation of Si 3 N 4 enables the composites to exhibit satisfactory high-temperature resistance. Thus, these performances render the composites promising materials to address increasing electromagnetic pollution, particularly at high temperatures.
研究领域:
材料科学
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电磁学
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2026
·Vol. 37
·期 13
·1005
·
IF 3.2
Jia Wenlei,Geng Rencong,Yang Ping,Li Mingwei,Qi Wenhan,Zhou Ju,Yue Yihua,Li Shiqi,Han Jiao,Zeng Yiming
To improve the comprehensive properties of Si 3 N 4 ceramics, diamond powders with different particle sizes (1 and 2 μm) were added. The effects of diamond particle size on carbothermal reduction behavior, phase evolution, microstructure, and thermomechanical properties of Si 3 N 4 ceramics were systematically investigated. The results show that 1 μm diamond exhibits higher reactivity because of its smaller particle size and larger specific surface area, which promotes the carbothermal reduction of surface silica, decreases oxygen-related impurities, and increases the N/O ratio of the liquid phase. As a consequence, the dissolution–reprecipitation growth of elongated β-Si 3 N 4 grains is enhanced, leading to reduced grain-boundary scattering and improved thermal conductivity. In contrast, 2 μm diamond shows lower reactivity, resulting in insufficient carbothermal reduction, hindered densification, and inferior overall properties. Although the sample containing 1 μm diamond exhibits the highest thermal conductivity, its flexural strength decreases slightly, which is attributed to the combined effects of grain coarsening, reduced intergranular phase, and increased defect sensitivity. These results demonstrate that optimizing diamond particle size is an effective approach for regulating oxygen impurity, microstructure, and overall performance in Si 3 N 4 ceramics.
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European Physical Journal-Special Topics
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2025
·
IF 2.3
Xiang Yue,Miao Zhicong,Wu Zhixiong,Liu Huiming,Huang Chuanjun,Yang Zengchao,Li Jiangtao,Huang Rongjin,Li Laifeng
The packaging structure with efficient heat conduction and dissipation is the key to ensuring rapid cooling and heat dissipation for superconducting magnets. However, as the most common encapsulated adhesive, epoxy resin has an extremely low thermal conductivity at low temperatures (< 0.1 W/(m·K) at 77 K), which can no longer meet the demands of future superconducting technology. In this work, a high-thermal-conductivity dielectric epoxy composite was obtained by using binary fillers consisting of α- and β-silicon nitride (Si 3 N 4 ) as a reinforcement. Compared to the unitary filler system, the binary filler system can generate a more efficient thermal conduction pathway inside the composites. The results demonstrated that at a binary filler content of 60 wt%, the Si 3 N 4 -2/EP composite (α-Si 3 N 4 : β-Si 3 N 4 = 2: 8) exhibited a 687.8% increase in thermal conductivity at room temperature (RT) and a 3266% increase at low temperature (77 K) compared to neat epoxy. Over the temperature range of 77–293 K, the Si 3 N 4 -2/EP composite exhibited an average coefficient of thermal expansion (CTE) as low as 14.1 × 10 –6 ·K −1 , which was reduced by 63%. This work provides a promising strategy for obtaining high thermal conductivity encapsulation materials for superconducting magnets.
研究领域:
材料科学
·
物理学
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Hongyu Zhang,Jing Wu,Jielun Li,Tongyang Li,Zhuhui Qiao
In this study, CoO was used as a toughening phase to fabricate CoO-doped Si 3 N 4 ceramics by spark plasma sintering. The effects of different temperatures (1700°C, 1750°C,1800°C,1850°C) and CoO contents(0 wt%, 5 wt%, 10 wt%, 15 wt%) on the phase composition, microstructure, mechanical properties, and tribological properties of Si 3 N 4 ceramics were systematically investigated. The X-ray diffraction analysis revealed the formation of a new phase CoSi during the sintering process. Experimental results showed that the samples with 10 wt% CoO resulted in a 30% increase in the fracture toughness of the samples at a sintering temperature of 1700°C. Furthermore, at a sintering temperature of 1750°C, 5 wt% CoO increased the hardness by 12% and 10 wt% CoO increased the flexural strength by 51%. The doping of CoO improves the wear resistance of the material, and wear rate reduced by 71% compared to undoped CoO. Finally, first-principles calculations confirmed the interface stability of Si 3 N 4 -CoSi heterojunction. This study provides a new technological path for the development of Si 3 N 4 ceramic bearing materials with high toughness and excellent wear resistance.
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JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Ao Wang,Zhifeng Huang,Mingyong Jia,Xuye Wang,Qianshun Cui,Zhihao Wang,Qiang Shen,Fei Chen
Vat photopolymerization 3D printing of Si 3 N 4 ceramics enables complex geometries, but oxygen inhibition during photocuring induces incomplete resin polymerization. Additionally, although larger Si 3 N 4 particles improve curing depth, their sparse packing after debinding compromises sintering densification. In the present work, the oxygen reduction effect of potassium iodide was utilized to mitigate the influence of surface oxygen on resin curing. As a result, the curing depth was enhanced to 132 µm, surpassing the previously reported values of less than 90 µm. This advancement enabled the successful fabrication of complex Si 3 N 4 ceramic components with a single-layer thickness of 50 µm. Furthermore, Al(H 2 PO 4 ) 3 was incorporated as a binder, which decomposes during the debinding process to form A-type phosphate salts on the surface of the large-size (2.66 µm) Si 3 N 4 powders. These salts establish physical bonds among the powders, effectively reducing interparticle spacing and promoting densification. The present work synthesized Si 3 N 4 ceramics with a flexural strength of 304 MPa at a relatively low sintering temperature of 1700°C.
研究领域:
材料科学
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陶瓷工程
·
3D打印技术
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Li Xuefei,Jiang Pan,Wu Zumin,Yu Wei,Guo Zhiwei
The severe wear of friction pairs in water-lubricated bearings, resulting from lubricating film instability under boundary lubrication, has hindered their development and application. Enhancing surface wettability to improve interfacial adsorption capacity for water molecules and promote stable water film formation under harsh operating conditions represents an effective approach for ameliorating lubrication performance in water-lubricated bearings. Hydrophilic-modified Si 3 N 4 /polyurethane (PU) composite materials were fabricated utilizing Si 3 N 4 ceramic/PU composite material fabrication technology combined with PMPC and β-cyclodextrin surface grafting techniques. Surface characteristics, mechanical properties, and tribological performance were systematically evaluated, specifically elucidating the influence mechanisms of hydrophilic groups on wettability and lubrication behavior. Results demonstrate that distinct hydrophilic groups differentially affect composite material performance, with β-cyclodextrin exhibiting more pronounced effects. Compared to the control group, the contact angles of PMPC and β-cyclodextrin-modified composite materials were decreased by 5.69% and 10.53%, respectively. Surface-bound hydrophilic groups lowered water-lubricated friction coefficients and effectively suppressed friction-induced vibration. Superior enhancement of tribological properties was provided by β-cyclodextrin modification relative to PMPC, with optimal performance achieved at solution –OH concentrations of 0.6 mol/L. This work presents a viable strategy for mitigating tribological challenges in water-lubricated bearing materials operating under boundary lubrication state. Graphical abstract
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Journal of Materials Chemistry C
·
2016
·Vol. 4
·期 47
·11212-11218
·
IF 5.066
Shun Dong,Ping Hu,Xinghong Zhang,Yuan Cheng,Dongyang Zhang,Liwen Yan,Guiqing Chen
Single-crystalline Si3N4 nanobelts (NBs) were successfully synthesized in a size-controlled manner using graphite, nanosilicon and nanosilica powders in N2 gas. The average width of Si3N4 NBs increased with an increase in the flow rate of N2 gas, with 264 nm at 50 ml min−1, 295 nm at 100 ml min−1 and 341 nm at 200 ml min−1. The room-temperature photoluminescence (PL) spectra showed that the synthesized α-Si3N4 nanobelts with three different sizes all had two strong emission peaks located in the yellow and red spectral range, which could be mainly attributed to the incorporation of a small amount of Al in the NBs, and the larger size could also lead to a slight red shift. The Young's modulus of Si3N4 NBs was measured with a hybrid scanning electron microscope/scanning probe microscope (SEM/SPM) system by means of the modulated nanoindentation method. The Young's modulus of Si3N4 NBs strongly depended on their size, decreasing from about 548.6 to 455.1 GPa, which can be explained by surface effects and defect-related effects arising due to their nanometer size. These findings provide a method to tailor the optical and mechanical properties of the NBs in a controlled manner over a wide range of Young's modulus values.
研究领域:
材料科学
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纳米技术
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光学性能
·
力学性能
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Journal of Asian Ceramic Societies
·
2022
·
IF 2.546
Ping Yang,Zhenfei Sun,Shengwu Huang,Jun Ou,Qiangguo Jiang,Dichen Li,Shanghua Wu
Due to high light absorption and high refractive index of silicon nitride (Si3N4) ceramic, it is difficult to prepare Si3N4 slurry with favorable curing ability, high solid loading and low viscosity at the same time, and thus the high-quality Si3N4 parts are hard to fabricate via Digital Light Processing (DLP). In this paper, the oxidation process was used to enhance the curing behavior of Si3N4 slurry, and then silane coupling agent (KH560) was used to improve the rheological properties of the oxidized Si3N4 slurry. The effect of Si3N4 slurry with oxidation and modification on its rheological behavior, light absorption, curing ability and stability have been systematically investigated. A Si3N4 slurry with abundant photocuring ability, high solid loading, low viscosity and reliable stability was fabricated by the oxidized (1 h) and KH560 (1 wt.%) modified Si3N4 powders, and the dense Si3N4 ceramic parts were produced by this slurry via DLP 3D printing. Subsequently, the influence of oxidation and modification on microstructure, mechanical properties and thermal conductivity have been investigated. Finally, the microstructure and performances of Si3N4 ceramic were compared between different forming processes (including: DLP and cool isostatic pressing).
研究领域:
材料科学
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3D打印技术
·
陶瓷加工
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Chongjun Li,Xiaodong Li,Jiakai Cao,Lei Yang,Zhanggui Hu,Gang He
Silicon nitride (Si 3 N 4 ) is regarded as a promising filler for thermal conductive composites due to its excellent thermal and electrical properties. In this work, the effects of oxygen content and surface modification of combustion synthesized β-Si 3 N 4 filler on the thermal, electrical, and mechanical properties of polydimethylsiloxane (PDMS) composites were investigated. The results demonstrate that an increase in the oxygen content of β-Si 3 N 4 filler leads to a significant deterioration in the thermal conductivity of the PDMS/β-Si 3 N 4 composites, while the dielectric constant decreases accordingly. Surface modification by vinyltrimethoxysilane (VTMS) improves the interfacial bonding between β-Si 3 N 4 filler and PDMS matrix, which increases the filler loading. PDMS composite with a high thermal conductivity of 4.26 Wm −1 K −1 was acquired using the binary filler comprising 64 wt% Al 2 O 3 and 29 wt% β-Si 3 N 4 . This work provides valuable guidance for the application of combustion synthesized β-Si 3 N 4 filler in highly thermal conductive composites.
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