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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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Chongjun Li,Lei Yang,Jieliang Su,Jianping Zhang,Jiakai Cao,Xiaodong Li,Gang He,Zhanggui Hu
Silicon nitride (Si 3 N 4 ) is regarded as promising material for various applications in the fields of electronics, chemistry and mechanics due to its outstanding properties. However, the high preparation cost has been one of the main obstacles that limits its large-scale industrial applications. Herein, we report a cost-effective strategy to synthesis high quality β -phase Si 3 N 4 powder by low-cost combustion synthesis method using recycled kerf loss silicon waste from photovoltaic industry . The effects of reaction pressure and additive on the oxygen content, phase composition, morphology and reaction mechanism of the prepared powders were investigated. Pure phase β -Si 3 N 4 powder of low oxygen content (0.95 wt%) was obtained at low combustion reaction pressure (2 MPa) with an environmentally friendly new additive C 3 H 6 N 6 . Thermal conductive silicon rubber composites were prepared by using the synthesized β -Si 3 N 4 powder as a filler. The effects of filler content on the microstructure, thermal, electric and mechanic properties of the fabricated polydimethylsiloxane (PDMS) composites were investigated. A high thermal conductivity of 1.4 Wm −1 K −1 was achieved in the PDMS composite with the addition of 80 wt% β -Si 3 N 4 powder, which is comparable to that of commercial β -Si 3 N 4 powder made from high purity silicon powder. This work proved that the recycled silicon waste from photovoltaic industry has the potential to be used as the silicon source for the cost-effective synthesis of high quality β -Si 3 N 4 powder for high thermal conductive composites applications .
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 3
·1-12
·
IF 2.8
Huang Kai,Que Tao,Guo Xiang,Wang Rui,Ding Xiang,Zhou Hongqing
The advancement of high-density integration and packaging technologies necessitates the development of packaging materials that possess enhanced thermal conductivity and substantial mechanical strength. In this paper, we present a novel type of CaO–B 2 O 3 –SiO 2 /β-Si 3 N 4 composites synthesized through the solid-state reaction. The effects of β-Si 3 N 4 ceramic content on the sinterability, phase structure, microstructure, and properties of the composites were studied. As an excellent structural and functional material, the rod-like β-Si 3 N 4 ceramic not only enhanced the thermal conductivity (λ) and flexural strength of composite materials but also effectively reduced the thermal expansion coefficient (CTE) of the composite and maintained good high-frequency dielectric properties. The composite sample containing 15wt.% β-Si 3 N 4 demonstrated exceptional performance after sintering at 850 ℃ for 30 min, achieving a bulk density of 2.80 g/cm 3 , a relative permittivity of 6.52 with a dielectric loss of 1.94 × 10 –3 (15 GHz), a λ of 3.5 W/(m·K), a CTE value of 6.40 ppm/ ℃, and a flexural strength of 180.1 MPa. Additionally, the EDS line mapping indicates that there was no diffusion of silver at the interface, thereby affirming the favorable compatibility between the composite and the silver electrode. This characteristic positions the CBS/β-Si 3 N 4 composite as a potentially promising candidate for applications in electronic packaging.
研究领域:
材料科学
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电子工程
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高影响因子
COMPOSITE INTERFACES
·
2023
·
IF 2.6
Fayu Li,Jinwei Yin,Dongxu Yao,Yongfeng Xia,Hanqin Liang,Yu-Ping Zeng
The poor wettability between the ceramic reinforcements and the metal matrix makes it difficult to realize the densification process of composites, which is severely detrimental to their mechanical properties. To improve the mechanical properties of Al matrix composites (AMCs) reinforced by β-Si3N4 whiskers (β-Si3N4w), we prepare TiN coating on the surface of β-Si3N4w via molten salt process, remarkably strengthening the interface bonding between Al matrix and β-Si3N4w. By optimizing the coating layer thickness, the bending strength of AMCs reinforced by TiN-coated β-Si3N4w reaches 439 MPa at 850°C, exhibiting remarkable enhancement relative to the composites without TiN coating (335MPa). Meanwhile, the interfacial test shows that TiN-coated β-Si3N4w is well bonded with the Al matrix, and no interfacial defects were detected. Moreover, the TiN coating with appropriate thickness can efficiently alleviate the agglomeration of β-Si3N4w, promote the densification of AMCs, and modify the Al/β-Si3N4w interface.
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高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Zhenghong Ju,Siyong Gu,Tao Li,Chujun Lin,Jidong Ma,Dongxu Qiao,Zhongyou Que,Huifeng Lu,Houan Zhang
Silicon nitride (Si 3 N 4 ) ceramics fabricated via hot-pressing sintering exhibit pronounced anisotropy in their properties, which restricts their practical applications. To clarify underlying mechanism responsible for this anisotropy, this study investigates the effect of β-Si 3 N 4 content on the anisotropy of microstructure, mechanical properties, and thermal conductivity of hot-pressed Si 3 N 4 ceramics. Results indicate that preferential growth of rod-like β-Si 3 N 4 along sintering pressure direction, together with intrinsic property differences between its c -axis and a -axis, induces the anisotropy in both microstructure and material properties of Si 3 N 4 ceramics. Among investigated samples, Si 3 N 4 ceramic consisting primarily of elongated rod-like β-Si 3 N 4 and small amount of residual α-Si 3 N 4 , exhibits highest degree of microstructural texture and most pronounced anisotropy in mechanical properties and thermal conductivity. Fracture toughness and flexural strength of Si 3 N 4 ceramics are higher in direction perpendicular to sintering pressure while thermal conductivity is higher in direction parallel to sintering pressure. Consequently, it is difficult to simultaneously optimize mechanical properties and thermal conductivity in same direction.
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高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Weide Wang,Dongxu Yao,Hanqin Liang,Yongfeng Xia,Kaihui Zuo,Jinwei Yin,Yu-Ping Zeng
The effect of YH 2 on densification, microstructure, and thermal conductivity of Si 3 N 4 ceramics were investigated by adjusting the amount of YH 2 in the range of 0–4 wt% using a two-step sintering method. Native SiO 2 was eliminated, and Y 2 O 3 was in situ formed by a metal hydride reduction reaction, resulting in various Y 2 O 3 /SiO 2 ratios. Full densification of YH 2 -doped samples could be achieved after sintering at 1900 °C for 4 h. The Y 2 O 3 /SiO 2 ratio had a significant influence on the composition of crystalline secondary phases. Besides, the increased Y 2 O 3 /SiO 2 ratio is conducive not only to the grain growth but also to the reduction of activity of SiO 2 in the liquid phase, resulting in enlarged purified grains, reduced volume fraction of intergranular phases and increased Si 3 N 4 -Si 3 N 4 contiguity. Ultimately, the thermal conductivity increased by 29 % from 95.3 to 123.0 W m −1 K −1 after sintering at 1900 ℃ for 12 h by the substitution of Y 2 O 3 with YH 2 .
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
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jieyan Zhao,Yingnan Song,Zengchao Yang,Yong Li,Jiangtao Li
Daytime radiative cooling enables passive cooling of objects without consuming energy. However, it is a challenge for most radiative cooling films to achieve exceptional solar reflectivity , infrared emissivity and thermal conductivity simultaneously, which limits their applications in above-ambient conditions such as electrical equipment . Herein, we prepare highly solar-reflective β -Si 3 N 4 dielectric particles with solar reflectivity exceeding 0.91 and atmospheric window emissivity of 0.93 by one-step combustion synthesis . The radiative cooling film consisted of β -Si 3 N 4 particles and PVDF matrix achieves a subambient cooling performance of 11.63 °C and theoretically yields a radiative cooling power of 45.41 W m −2 in the daytime. Futhermore, the film exhibits high thermal conductivity of 3.19 W m −1 K −1 due to the heat conducting pathways constructed by elongated rod-like β -Si 3 N 4 particles, which leads to a remarkable temperature drop of 5.00 °C when be applied on the surface of 5 W LED. The film reported here provides a practical option for the efficient radiative cooling and heat dissipation of electrical equipment.
研究领域:
材料科学
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热能工程
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光子学
·
能源效率
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DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 23
·5830
·
IF 3.1
Qing Qin,Lin Han,Gang Xiong,Zihan Guo,Junwei Huang,Yujuan Zhang,Zhen Shen,Changchun Ge
Digital light processing (DLP) 3D-printed Si₃N₄ ceramics, known for their exceptional performance, offer distinct advantages in meeting the high-strength and complex structural demands of industries such as aerospace, semiconductors, healthcare, automotive, energy, and machinery. However, due to Si₃N₄’s strong chemical stability, low diffusion rate, low self-sintering ability, and high melting point, achieving densification under conventional sintering conditions is challenging. As a result, sintering additives are essential to promote the sintering process, lower the sintering temperature, improve densification, and enhance performance. In this study, 45 vol% Si₃N₄ slurries were prepared using DLP 3D printing technology, incorporating nine different combinations of sintering additives, including aluminum oxide (Al2O3), yttrium oxide (Y2O3), and aluminum nitride (AlN), in various ratios with Si3N4. The slurries were then sintered at 1800 °C for 2 h under a 1 MPa N2atmosphere. Additionally, the phase composition, microstructure, grain distribution, and crack propagation of the materials. The results showed that a Si3N4to Al2O3and Y2O3ratio of 95:2.5:2.5 produced elongated β-Si3N4grain structures and enhanced density, achieving a maximum Vickers hardness of 12.88 ± 0.52 GPa. Additionally, the synergistic toughening effect of the rod-like β-Si3N4grains and sintering aids significantly improved the fracture toughness of the Si3N4ceramic matrix, with a flexural strength of 540.63 ± 10.05 MPa and a fracture toughness of 4.92 ± 0.07 MPa·m1/2. This study lays the foundation for the future application of 3D-printed Si3N4ceramics, optimization of sintering aid combinations at different ratios, and performance enhancement in extreme environments.
研究领域:
材料科学
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陶瓷工程
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增材制造
·
机械工程
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DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）