CERAMICS INTERNATIONAL
·
2015
·
IF 2.605
Biao Zhang,Feng Ye,Ye Gao,Shichao Liu,Qiang Liu,Donghai Ding
Ni 0.5 Ti 0.5 NbO 4 was firstly reported as filler to adjust dielectric properties of polymer matrix composites for printed circuit board (PCB) application. In this study, the Ni 0.5 Ti 0.5 NbO 4 filler was modified using γ-aminopropyl triethoxy silane (KH550). The effects of KH550 on particle lipophilicity and Bisphenol-A cyanate ester resin (BADCy) curing behavior were studied. BADCy/Ni 0.5 Ti 0.5 NbO 4 composites were fabricated by the traditional casting method. The dielectric properties and moisture absorption of the composites were tested. Results show that most hydrophilic groups on the surface of Ni 0.5 Ti 0.5 NbO 4 powder are replaced by lipophilic groups after modification, which results in the obvious improvement of Ni 0.5 Ti 0.5 NbO 4 filler dispersion in BADCy. Beyond that, surface modification also greatly affects the curing behavior of BADCy resin. The BADCy/Ni 0.5 Ti 0.5 NbO 4 -KH550 composites exhibit excellent dielectric properties as well as low moisture absorption. Furthermore, the dielectric constant can be accurately predicted using Effective Medium Theory (EMT model) when the morphology factor is 0.1407.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2015
·
IF 3.569
Biao Zhang,Feng Ye,Ye Gao,Qiang Liu,ShiChao Liu,Limeng Liu
Bisphenol-A cyanate ester resin (BADCy)/Ni 0.5 Ti 0.5 NbO 4 composites with novel structure, within which Ni 0.5 Ti 0.5 NbO 4 and BADCy are continuous directional distribution and parallel to the electric field direction (marked as composite-directional), were designed and fabricated using freeze casting combined with vacuum assisted infiltration process. Dielectric properties as well as the moisture absorption of the composites were studied. Theoretical models used to predict the dielectric properties of the composites were established. Results show that the novel structure can significantly improve the dielectric constant while decrease dielectric loss compare with traditional structure in which Ni 0.5 Ti 0.5 NbO 4 filler is homogeneously distributed (the composite marked as composite-homogeneous). Dielectric constant of composite-directional is as high as 19.93 while dielectric loss is only 4.07 × 10 −3 (at 7319 MHz) when Ni 0.5 Ti 0.5 NbO 4 content is 43.79 vol%. Furthermore, the dielectric constant of both composite-directional and composite-homogeneous can be predicted using Rother-Lichtenecker model when the fitting parameters ( n ) are −0.5188 and −0.1499, respectively. Distribution state of Ni 0.5 Ti 0.5 NbO 4 is the main reason for the difference of fitting parameters. Due to the excellent properties of composite-directional, this kind of composites can be used as printed circuit board (PCB) materials.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Biao Zhang,Feng Ye,Shichao Liu,Haoqian Zhang,Qiang Liu,Ye Gao,Jie Ma
In this study, we developed a new route to fabricate polymer/ceramic composites. This method mainly involves tape casting and vacuum assist infiltration (called TC-VI). Composites, using Bisphenol-A cyanate ester resin (BADCy) as matrix and mixed dielectric ceramic powders (1− x ) Ni 0.5 Ti 0.5 NbO 4 + x ZnNb 2 O 6 ( x = 0–100 vol. %) as fillers, were prepared successfully by this route. Dielectric properties and thermal conductivity of the composites were tested. Furthermore, the migration of silver (Ag) electrodes in the composites was investigated. Results show that the composites exhibit excellent dielectric properties. Dielectric constant of the composites can be adjusted continuously from 13.49 to 22.46 (at 9045 MHz). Dielectric loss is lower than 3.68 × 10 −3 (at 7320 MHz). The addition of ceramic fillers can significantly enhance the thermal conductivity of BADCy resin. Moreover, no obvious Ag element migration can be detected in the composites. Due to the good performances of the composites, this method could be widely used in the fabrication of multilayer devices.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Huanhuan Wang,Yanfeng Shang,Yuanxun Li,Yulong Liao,Limei Ruan,Yong Liu
The large negative temperature coefficient of resonant frequency ( τ f ) remains a critical bottleneck restricting the high-temperature application of ZnNb 2 O 6 microwave ceramics. In this work, a titanium-tungsten (TiW) complex cation co-doping strategy was employed to modulate the crystal structure and improve the intrinsic microwave properties of ZnNb 2 O 6 . The optimized ZnNb 1.98 (TiW) 0.02 O 6 ceramic exhibited excellent microwave performance, with a dielectric constant ( ε r ) of 24.0, a high Q×f value of 120,000 GHz, and a τ f of −100.0 ppm/°C at a sintering temperature of 1100 °C. To further address the thermal instability issues, a composite ceramic system combining (1-x) ZnNb 1.98 (TiW) 0.02 O 6 with xNi 0.5 Ti 0.5 NbO 4 was developed, which effectively compensated for the large negative τ f and strikes a balance between thermal stability and dielectric performance. When x = 0.6, the composite ceramic exhibited a higher ε r of 31.7, a Q×f value of 29,800 GHz, and τ f of 0 ppm/°C. These results demonstrate that the composite strategy enables simultaneous optimization of temperature stability and dielectric properties. This approach offers a promising route for thermally resistant microwave ceramics in extreme-environment applications.
研究领域:
材料科学
·
无机非金属材料
·
功能陶瓷
·
介电材料
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 26
·期 10
·7823-7828
·
IF 1.569
Zhang Biao,Ye Feng,Liu Shichao,Liu Qiang,Gao Ye
A simple method, which include cold isostatic pressing and vacuum assisted infiltration, that can significantly improve the filler content, was employed to fabricate Bisphenol-A cyanate ester resin (BADCy)/Ni 0.5 Ti 0.5 NbO 4 composites with high-k and ultra-low-loss. Results show that briquetting pressure and sintering temperature for fabricating Ni 0.5 Ti 0.5 NbO 4 porous preforms have a great influence on the properties of BADCy/Ni 0.5 Ti 0.5 NbO 4 composites. The optimal process for the fabrication of BADCy/Ni 0.5 Ti 0.5 NbO 4 composites is fixing the briquetting pressure at 90 MPa and sintering temperature at 700 °C. The dielectric constant and loss of the composites are 22.79 and 4.17 × 10 −3 at 9041 MHz, respectively. Properties of this kind of composites can meet the requirements for high-k and ultra-low-loss PCB application.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）