The dimensional effect of MgTiO3 ceramic filler on the microwave dielectric properties of PTFE/MgTiO3 composite with ultra-low dielectric loss

Peng, Haiyi; Ren, Haishen; Dang, Mingzhao; Zhang, Yi; Gu, Zemao; Yao, Xiaogang; Lin, Huixing

doi:10.1007/s10854-019-00977-y

Cited by 22 publications

(8 citation statements)

References 18 publications

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“…In the effective medium theory, m is a morphology factor. The small value of m , i.e., 0.04 for our fitting, means the filler particles are close to a spherical shape [19,30], which is consistent with our microstructural observations.…”

Section: Resultssupporting

confidence: 85%

“…The densities of all the samples are shown in Figure 2. The theoretical values were calculated by the following equation: ρ=(1−Vf)·ρm+Vf·ρf, where ρ , ρ m , ρ f are the density of the composite, polymer matrix, and the filler, respectively, and V f is the volume ratio of the filler [19]. Using the densities of current silicone rubber sample (1.57 g/cm 3 ) and the pure AlN (3.26 g/cm 3 ), the theoretical densities of all samples were thus obtained and also shown in Figure 2.…”

Section: Resultsmentioning

confidence: 99%

“…For ceramic–polymer composites, the effective medium theory is usually used to calculate the dielectric constant of the composite samples [19,29]. Based on this theory, the dielectric constant of the composite can be written as: εc=εm[1+∅(εp−εm)εm+m(1−∅)(εp−εm)], where ε c , ε m , and ε p are the relative dielectric constants of the composite, polymer matrix (2.09 at 10 kHz and 1.88 at 100 kHz), and particle filler (8.8 for AlN), respectively, and ∅ is the filling fraction in volume.…”

Section: Resultsmentioning

confidence: 99%

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The Effects of Aluminum-Nitride Nano-Fillers on the Mechanical, Electrical, and Thermal Properties of High Temperature Vulcanized Silicon Rubber for High-Voltage Outdoor Insulator Applications

Liu

et al. 2019

Materials

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AlN nanoparticles were added into commercial high-temperature-vulcanized silicon rubber composites, which were designed for high-voltage outdoor insulator applications. The composites were systematically studied with respect to their mechanical, electrical, and thermal properties. The thermal conductivity was found to increase greatly (>100%) even at low fractions of the AlN fillers. The electrical breakdown strength of the composites was not considerably affected by the AlN filler, while the dielectric constants and dielectric loss were found to be increased with AlN filler ratios. At higher doping levels above 5 wt% (~2.5 vol%), electrical tracking performance was improved. The AlN filler increased the tensile strength as well as the hardness of the composites, and decreased their flexibility. The hydrophobic properties of the composites were also studied through the measurements of temperature-dependent contact angle. It was shown that at a doping level of 1 wt%, a maximum contact angle was observed around 108°. Theoretical models were used to explain and understand the measurement results. Our results show that the AlN nanofillers are helpful in improving the overall performances of silicon rubber composite insulators.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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The Effects of Aluminum-Nitride Nano-Fillers on the Mechanical, Electrical, and Thermal Properties of High Temperature Vulcanized Silicon Rubber for High-Voltage Outdoor Insulator Applications

Liu

et al. 2019

Materials

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“…Further, at B 2 O 3 <2 wt%, the dielectric constant of the samples was increased, and the dielectric loss decreased significantly. This was because the Mg 2 TiO 4 synthesis was inhibited, and the density of the samples increased [12,15,25]. This was consistent with the variation in the XRD and the density studies.…”

Section: Dielectric Propertiessupporting

confidence: 78%

Influence of B₂O₃ doping on synthesis of MgTiO₃ ceramics from recycled magnesia-hercynite materials

Jia

Mao

Lin

et al. 2021

Mater. Res. Express

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Herein, magnesium metatitanate (MgTiO3) ceramics were synthesised using recycled magnesia-hercynite (MH) bricks as the raw materials to achieve solid waste reusing of cement kiln refractories. The recycled MH materials were mixed with anatase TiO2 to investigate the effect of addition of doped B2O3 during the synthesis of MgTiO3 ceramics at 1400 °C. Phase compositions and microstructural studies were performed using x-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. In addition, energy-dispersive spectroscopy (EDS) was conducted and the dielectric properties of the samples were studied. Results show that the addition of B2O3 can promote sintering, improve shrinkage, promote densification, stabilise MgTiO3 lattice, and inhibit the formation of MgTiO3. In addition, the presence of appropriate amount of B2O3 can accelerate the material diffusion and result in grain growth through the formation of intercrystalline liquid phase. Results also suggest that an increase in dielectric constant results in a decrease in dielectric loss. It was concluded that 2 wt% was the optimum amount of B2O3 required to obtain the most favourable synthesis rate of MgTiO3 (98.2%). The samples exhibited a maximum density of 3.69 g·cm−3 and excellent microwave dielectric properties at ε r = 18.28 and tanδ = 0.086.

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“…The hybrid modification of single-/multi-component fillers via the molding process is usually used to improve the thermal-mechanical properties of PTFE. The types of fillers can be divided into two categories according to the material feature, such as inorganic fillers and metal fillers [6,7]. Based on the morphology and grain sizes of fillers, they are classified into micron, submicron, nano-scale spherical or fiber shaped fillers [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Design of Novel POB/h-BN Co-Filled PTFE Composites with Enhanced Thermal–Mechanical Properties

et al. 2021

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Polytetrafluoroethylene (PTFE) is provided with excellent self-lubricating properties and corrosion resistance. However, the lower thermal resistance greatly limits its high-temperature applications. In the present work, two types of fillers with rigid organic polymers and submicron-sized inorganic hexagonal boron nitride (h-BN) were added to the PTFE matrix. The microstructure and thermal–mechanical properties of PTFE-based composites with different filler types or ratios were comparatively investigated. The results suggested that the polyphenyl ester (POB)/h-BN co-filled PTFE composites exhibited excellent thermal–mechanical properties compared with the polyimide (PI)/h-BN/PTFE materials at high temperature. The optimal ratios of POB and h-BN were 25 wt.% and 5 wt.%, respectively. The Vicat softening temperature of 25 wt.% POB/5 wt.% PI/PTFE composite increased by 41.3% compared to that of pure PTFE, which was due to the cross-linked reticulation structure with regularly distributed pores and higher crystallization degree. The storage modulus increased from 51.99 MPa to 685.76 MPa at 260 °C and reached 187.82 MPa at 320 °C. The uniform distribution of anisotropic orientation of the h-BN flakes showed an obvious pinning effect, and further improved the thermal–mechanical stability of POB/h-BN/PTFE composites.

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The dimensional effect of MgTiO3 ceramic filler on the microwave dielectric properties of PTFE/MgTiO3 composite with ultra-low dielectric loss

Cited by 22 publications

References 18 publications

The Effects of Aluminum-Nitride Nano-Fillers on the Mechanical, Electrical, and Thermal Properties of High Temperature Vulcanized Silicon Rubber for High-Voltage Outdoor Insulator Applications

The Effects of Aluminum-Nitride Nano-Fillers on the Mechanical, Electrical, and Thermal Properties of High Temperature Vulcanized Silicon Rubber for High-Voltage Outdoor Insulator Applications

Influence of B₂O₃ doping on synthesis of MgTiO₃ ceramics from recycled magnesia-hercynite materials

Design of Novel POB/h-BN Co-Filled PTFE Composites with Enhanced Thermal–Mechanical Properties

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The dimensional effect of MgTiO3 ceramic filler on the microwave dielectric properties of PTFE/MgTiO3 composite with ultra-low dielectric loss

Cited by 22 publications

References 18 publications

The Effects of Aluminum-Nitride Nano-Fillers on the Mechanical, Electrical, and Thermal Properties of High Temperature Vulcanized Silicon Rubber for High-Voltage Outdoor Insulator Applications

The Effects of Aluminum-Nitride Nano-Fillers on the Mechanical, Electrical, and Thermal Properties of High Temperature Vulcanized Silicon Rubber for High-Voltage Outdoor Insulator Applications

Influence of B2O3 doping on synthesis of MgTiO3 ceramics from recycled magnesia-hercynite materials

Design of Novel POB/h-BN Co-Filled PTFE Composites with Enhanced Thermal–Mechanical Properties

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Influence of B₂O₃ doping on synthesis of MgTiO₃ ceramics from recycled magnesia-hercynite materials