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
✓ 已验证
产品关联
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2012
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IF 0.884
Zhongming Dai,Shiyang Zhu,Shanyou Liu,Shaowei Guan
Si3N4 fillers were added to polyethersulfone (PES) using the solution mixing and ball-mill mixing methods to increase the thermal conductivity. 3-Aminpropyltriethoxysilane was used as a coupling agent for the surface modification of the Si3N4 particles. The morphology, thermal stability, mechanical properties, and thermal conductivity of the Si3N4/PES composites were then studied in detail. The dispersion of the Si3N4 particles into the matrix resin was higher in ball-mill mixing than in solution mixing. As the Si3N4 content increased, the coefficient of thermal expansion of the composites gradually decreased, whereas the Vickers hardness and thermal conductivity increased. At 19 vol.% Si3N4, the thermal conductivities of the composites via ball-mill mixing and solution mixing reached 0.677 and 0.7 W/m·k, respectively.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
Polymers
·
2022
·Vol. 14
·期 14
·2952
·
IF 4.967
Ming-Chao Han,Shun-Zhong Cai,Ji Wang,Hong-Wei He
Meltblown (MB) nonwovens as air filter materials have played an important role in protecting people from microbe infection in the COVID-19 pandemic. As the pandemic enters the third year in this current global event, it becomes more and more beneficial to develop more functional MB nonwovens with special surface selectivity as well as antibacterial activities. In this article, an antibacterial polypropylene MB nonwoven doped with nano silicon nitride (Si3N4), one of ceramic materials, was developed. With the introduction of Si3N4, both the average diameter of the fibers and the pore diameter and porosity of the nonwovens can be tailored. Moreover, the nonwovens having a single-side moisture transportation, which would be more comfortable in use for respirators or masks, was designed by imparting a hydrophobicity gradient through the single-side superhydrophobic finishing of reactive organic/inorganic silicon coprecipitation in situ. After a nano/micro structural SiO2precipitation on one side of the fabric surfaces, the contact angles were up to 161.7° from 141.0° originally. The nonwovens were evaluated on antibacterial activity, the result of which indicated that they had a high antibacterial activity when the dosage of Si3N4was 0.6 wt%. The bacteriostatic rate againstE. coliandS. aureuswas up to over 96%. Due to the nontoxicity and excellent antibacterial activity of Si3N4, this MB nonwovens are promising as a high-efficiency air filter material, particularly during the pandemic.Keywords:PP meltblown nonwoven;silicon nitrile (Si3N4);filtration;antibacterial materials;superhydrophobicity
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
International Journal of Applied Ceramic Technology
·
2022
·Vol. 20
·期 3
·1855-1864
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IF 2.328
Shi Fu,Zengchao Yang,Honghua Li,Liang Wang,Yong Li,Jiangtao Li
Si 3 N 4 ceramics were prepared by gas pressure sintering at 1900°C for 12 h under a nitrogen pressure of 1 MPa using Gd 2 O 3 and MgSiN 2 as sintering additives. The effects of the Gd 2 O 3 /MgSiN 2 ratio on the densification, microstructure, mechanical properties, and thermal conductivity of Si 3 N 4 ceramics were systematically investigated. It was found that a low Gd 2 O 3 /MgSiN 2 ratio facilitated the thermal diffusivity of Si 3 N 4 ceramics while a high Gd 2 O 3 /MgSiN 2 ratio benefited the densification and mechanical properties. When the Gd 2 O 3 /MgSiN 2 ratio was 1:1, Si 3 N 4 ceramics obtained an obvious exaggerated bimodal microstructure and the optimal properties. The thermal conductivity, flexural strength, and fracture toughness were 124 W·m −1 ·k −1 , 648 MPa, and 9.12 MPa·m 1/2 , respectively. Comparing with the results in the literature, it was shown that Gd 2 O 3 -MgSiN 2 was an effective additives system for obtaining Si 3 N 4 ceramics with high thermal conductivity and superior mechanical properties.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yun Liu,Ruixiang Liu,Yuanhang Zheng,Jixue Zhao,Tianyi Sui,Xiaolei Li,Bin Lin
To investigate the mechanism of the influence of the sintering additive ratio on the microstructure evolution of silicon nitride (Si 3 N 4 ) ceramics, Si 3 N 4 ceramics were prepared by gas pressure sintering using different ratios of Y 2 O 3 /MgSiN 2 as additives. Varying the ratio of Y 2 O 3 /MgSiN 2 changed the composition of the liquid phase, thereby affecting the densification process and phase transformation rate of Si 3 N 4 ceramics, and ultimately changing their microstructure. The reduction in the Y 2 O 3 /MgSiN 2 ratio raised the N/O and Si/O ratios in the system, which increased the liquid phase viscosity. The Si 3 N 4 grain distribution varied from "normal to bimodal". In the case of increasing the proportion of MgSiN 2 and prolonging the sintering time, more of the glass phase evaporated, which reduced the content of the low thermal conductivity phase and increased the continuity of Si 3 N 4 /Si 3 N 4 . Therefore, Si 3 N 4 ceramics with 1 wt% Y 2 O 3 and 5 wt% MgSiN 2 exhibited excellent properties after sintering at 1900 °C for 12 h, with thermal conductivity, bending strength , and fracture toughness of 106.7 Wm −1 K −1 , 776 MPa, and 11.66 MPa m 1/2 , respectively.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
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2018
·Vol. 42
·期 14
·11715-11723
·
IF 3.201
Abdelaal S. A. Ahmed,Wanchun Xiang,Anna Gu,Xiaowei Hu,Ibrahim Amiinu Saana,Xiujian Zhao
A carbon black–silicon nitride (CB–Si3N4) nanocomposite is prepared as a cost-effective counter electrode (CE) for dye-sensitized solar cells (DSSCs). The CB–Si3N4 nanocomposite is coated on an FTO substrate via the screen printing method. The results demonstrate that when the thickness is fixed at 4.7 μm the CB–Si3N4 composite CE exhibits lower charge transfer resistance and higher electrocatalytic activity towards the reduction of tri-iodide over the CB and Si3N4 electrodes. The CB–Si3N4-3% CE achieves the best catalytic activity and the prepared DSSC shows a power conversion efficiency of 8.06%. As the thickness of the CB–Si3N4-3% CE increases, the electrocatalytic ability is enhanced, and the charge transfer resistance at the electrolyte/CE interface decreases. The overall performance of the CB–Si3N4-3% CE with a thickness of 14.1 μm is comparable to that of Pt-doped CEs. Furthermore, a DSSC equipped with CB–Si3N4-3% CEs of 14.1 μm thickness exhibits a high efficiency of 8.37%, which is comparable to that of the Pt-based DSSC (8.50%). The simple preparation technique, outstanding electrocatalytic activity, and low cost of production allow the CB–Si3N4 nanocomposite to be a promising and efficient CE for DSSCs.
研究领域:
材料科学
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能源科学
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
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2022
·Vol. 19
·期 5
·2533-2544
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IF 2.328
Changxi Jiang,Yinghua Zhuang,Jianjun Wang,Shengjun Liao,Lijuan Zhou,Shuang Li,Yunxia Zhao
Si 3 N 4 ceramics with high thermal conductivity and outstanding mechanical properties were prepared by adding β-Si 3 N 4 seeds and nanophase α-Si 3 N 4 powders as modifiers. The introduction of β-Si 3 N 4 seeds enhanced the growth of β-Si 3 N 4 grains. Owing to the interlocked structure induced by the β-Si 3 N 4 grains, the fracture toughness of Si 3 N 4 ceramics reached a high value of 7.6 MPa·m 1/2 ; also, the large-sized grains increased the contact possibility of Si 3 N 4 grains, improving the thermal conductivity of Si 3 N 4 ceramics (64 W/(m·K)). Because of the introduction of nanophase α-Si 3 N 4 , the flexural strength, fracture toughness, and thermal conductivity of the Si 3 N 4 ceramics increased to 754 MPa, 7.2 MPa·m 1/2 , and 54 W/(m·K), respectively. According to the analysis of the growth kinetics of Si 3 N 4 grains, the rapid growth of Si 3 N 4 grains was ascribed to the reduction in the activation energy resulting from the introduction of β-Si 3 N 4 seeds and nanophase α-Si 3 N 4 .
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Feng Hu,Zonghua Wang,Zhipeng Xie
With the advancement of power electronics, packaging materials are facing more stringent requirements, especially in mechanical reliability and thermal conductivity. Silicon nitride (Si 3 N 4 ) ceramics are promising due to their excellent mechanical properties, but their relatively low thermal conductivity limits wider applications. In this study, we propose a dual strategy of optimizing sintering aids during hot-press sintering to facilitate convenient regulation of β -Si 3 N 4 crystal-axis orientation, and applying heat treatment to enhance thermal conductivity while retaining excellent mechanical properties. The results show that the composition ratio of MgSiN 2 -Y 2 O 3 composite sintering aids significantly influences the crystallographic orientation (Lotgering orientation factors ranging from 0.19 to 0.29) and the anisotropy in thermal conductivity, with the aligned direction exhibiting a ∼24% higher thermal conductivity than the non-aligned direction. Post-sintering heat treatment at different temperatures further improved the grain boundary structure, leading to an additional ∼17% increase in thermal conductivity while maintaining high flexural strength (>800 MPa). This approach enables the effective tuning of grain alignment and boundary characteristics, balancing thermal and mechanical performance. The findings offer a new pathway for developing high thermal conductivity Si 3 N 4 ceramics, expanding their potential for high-power electronic packaging applications.
研究领域:
材料科学
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陶瓷材料
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电子封装
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热管理
·
微观结构工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2021
·
IF 10.588
Nannan Zhang,Daoping Xiang
Solar cells based on crystalline silicon wafers have dominated the global photovoltaic market for many years. Unfortunately, a large amount of photovoltaic silicon waste (PSW) also was produced during the process of cutting silicon ingot into silicon wafer. The improperly discarded PSW will bring about serious environmental hazardous problems, so it is highly necessary to safely and effectively recover and utilize PSW. Here, we report self-assembled 3D Si 3 N 4 @SiO 2 nanofibre sponges utilising PSW as silicon sources for the first time. This kind of ceramic sponge displays excellent compression resilience under a maximum strain of 67% due to the flexibility of the Si 3 N 4 @SiO 2 nanofibres. The Si 3 N 4 @SiO 2 nanofibre sponges can withstand high temperatures beyond 1200 °C with negligible weight loss and demonstrates favourable thermal insulation properties. Furthermore, the porous Si 3 N 4 @SiO 2 nanofibre sponges possess ultra-low dielectric properties , with the minimum dielectric constant and dielectric loss approaching 1 and 0, respectively. In short, a simple and low-cost technology using industrial waste to fabricate versatile Si 3 N 4 @SiO 2 nanofibre sponges with prominent performance is of great significance for the development and application of 3D ceramic architectures in various industry fields including aerospace, electronic devices and thermal insulation.
研究领域:
材料科学
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环境科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Xuanzhi Chen,Yehua Li,Yujie Qi,Pengjin Huang,Haidong Wu,Xin Deng,Shanghua Wu
In this study, self-synthesized Gd 3 Si 2 C 2 and MgO were used as sintering aids to fabricate Si 3 N 4 ceramics via gas-pressure sintering. The results indicated that Gd 3 Si 2 C 2 reacted with inherent SiO 2 on the Si 3 N 4 surface to form Gd 2 O 3 and β-Si 3 N 4 in situ, thereby increasing the N/O ratio of the liquid phase. In addition, in situ β-Si 3 N 4 induced grain growth, enhancing the thermal conductivity of Si 3 N 4 ceramics while maintaining excellent mechanical properties. Compared to the samples with Gd 2 O 3 and MgO as sintering aids, those with Gd 3 Si 2 C 2 and MgO as sintering aids demonstrated superior overall performance with the thermal conductivity, bending strength, fracture toughness, and Vickers hardness of 101.96 W⋅m −1 ⋅K −1 , 848.26 ± 4.66 MPa, 6.23 ± 0.15 MPa⋅m 1/2 , and 16.56 ± 0.43 GPa, respectively.
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
CURRENT APPLIED PHYSICS
·
2013
·
IF 1.814
Qi-fei Lu,Jian Li,Da-jian Wang
A single-phased (Ba,Sr) 3 MgSi 2 O 8 :Eu 2+ , Mn 2+ phosphor with 660 nm-featured dual band-emission is investigated upon optimizing composition to simulate the artificial photosynthetic action spectrum (PAS) for near-ultraviolet (NUV) biological light-emitting diodes (bio-LEDs). A specific composition range in Ba–Sr binary solid solution of (Ba,Sr) 3 MgSi 2 O 8 is found to be capable of obtaining single-phased host in the absence of an easily formed orthosilicate impurity, leading to a 660 nm-featured red band emission of Mn 2+ induced by an efficient energy transfer from a co-doped blue-emitting Eu 2+ sensitizer. This dual broad band emission phosphor has a 72 nm full width at half maximum (FWHM) for red band that covers fairly well to the absorption spectrum of chlorophyll and PAS for most plants, enabling a flexible option in the application of bio-illumination for artificial photosynthesis.
研究领域:
材料科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Wenjing Zou,Ping Yang,Lifu Lin,Yehua Li,Shanghua Wu
Silicon nitride (Si 3 N 4 ) slurries with high solid loading, low viscosity and good stability is difficulty prepared, due to low intrinsic surface charge and a large refractive index (RI) difference between Si 3 N 4 powder and resin. In this paper, the curing behavior of Si 3 N 4 slurry with different functional group and RI of resin monomer were systematically researched, and then the kind and optimum content of dispersant were investigated. Subsequently, a high solid loading Si 3 N 4 slurry (44 vol%) with good curing behavior, low viscosity and favorable stability was successfully prepared. Lastly, the dense Si 3 N 4 ceramic parts were fabricated by the suitable Si 3 N 4 slurry (44 vol%) via stereolithography . After debinding and sintering process , the relative density and flexural strength of Si 3 N 4 ceramic were 98.28% and 800 ± 27.28 Mpa, respectively.
研究领域:
材料科学
·
制造工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）