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Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica EI SCIE PubMed Scopus
期刊论文 | 2018 , 11 (8) | MATERIALS
WoS CC Cited Count: 1
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Abstract :

Polypropylene (PP) contains promising application prospects in thermoplastic cables for high voltage direct current (HVDC) power transmission because of its outstanding thermal and dielectric properties. However, the problem of poor toughness and space charge has restricted the application of pure PP in HVDC cables. In this paper, polyolefin elastomer (POE) and nano-silica were blended thoroughly and added into a PP mixture by a melting method. Scanning electron microscopy (SEM) was employed to observe the dispersion of POE and nanoparticles. Thermal properties were characterized by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). Mechanical properties were evaluated by tensile tests. The elastomeric properties of composites were improved as the dispersed POE could transfer and homogenize external mechanical forces. DC breakdown results showed that the fail strength of composite with 10 phr POE and 1 phr nano-silica was obviously enhanced. The pulsed electro-acoustic (PEA) results showed that the injection and accumulation of space charge was increased by the introduction of POE, while it was restrained by the collective effect caused by nano-silica filling. X-ray diffraction (XRD) spectrograms showed that secondary ordered structures existed in the composites of PP, POE, and nano-silica, and that the ordered structure around the nanoparticles contributed to the enhancement of breakdown strength. The mechanical and dielectric properties were modified synergistically, which made the modified PP a propitious insulation material for HVDC cables.

Keyword :

PP-based dielectric elastomer blending nano-silica filling dielectric properties mechanical properties

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GB/T 7714 Chi, Xiaohong , Cheng, Lu , Liu, Wenfeng et al. Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica [J]. | MATERIALS , 2018 , 11 (8) .
MLA Chi, Xiaohong et al. "Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica" . | MATERIALS 11 . 8 (2018) .
APA Chi, Xiaohong , Cheng, Lu , Liu, Wenfeng , Zhang, Xiaohong , Li, Shengtao . Characterization of Polypropylene Modified by Blending Elastomer and Nano-Silica . | MATERIALS , 2018 , 11 (8) .
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Review of electrical properties for polypropylene based nanocomposite Scopus
期刊论文 | 2018 , 10 , 221-225 | Composites Communications
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Abstract :

© 2018 Polypropylene (PP), is one of the most widely used dielectric materials in electrical industry, especially in power capacitors and power cables. The requirement of higher electrical properties of PP by the rapid development of power system made the nanocomposite to be a promising solution to modify PP based dielectrics. In this review, we focused on the electrical properties and systematically gave an overview of PP based nanocomposite researches for power equipment application in recent years. We categorized the electrical properties into breakdown strength, dielectric permittivity, and long-term electrical performance, and summarized the correlations between enhanced properties and nanofiller types both experimentally and theoretically. Based on the achieved approaches, prospects for the future research on PP based nanocomposite was proposed, which may provide a worth-considering direction for the future work.

Keyword :

Dielectric Nanocomposite Polypropylene

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GB/T 7714 Liu, Wenfeng , Cheng, Lu , Li, Shengtao . Review of electrical properties for polypropylene based nanocomposite [J]. | Composites Communications , 2018 , 10 : 221-225 .
MLA Liu, Wenfeng et al. "Review of electrical properties for polypropylene based nanocomposite" . | Composites Communications 10 (2018) : 221-225 .
APA Liu, Wenfeng , Cheng, Lu , Li, Shengtao . Review of electrical properties for polypropylene based nanocomposite . | Composites Communications , 2018 , 10 , 221-225 .
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A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics EI
会议论文 | 2018 | 7th International Conference on Condition Monitoring and Diagnosis, CMD 2018
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Abstract :

Grain size and its spatial distribution are the crucial issues in the study of advanced materials with a grain-grain boundary structure. It not only implies the grain growth mechanism of those materials, but also determines most of their macroscopic properties, such as mechanical strength, current conduction, ageing and so on. Therefore, it is of importance to clarify the grain size distribution (GSD) in ZnO-based varistor ceramics, a key protection element against overvoltage. In the present paper, a new approach based on the log-normal distribution was proposed to analyze the variation of GSD along the thickness direction of two commercial ZnO varistors. It is found that GSD follows log-normal distribution rather than commonly used normal distribution. In addition, with the proposed grain size, i.e., averaged log-normal grain size (dLN) and most probable grain size (dmax), the variation of GSD along the thickness direction was clearly revealed, which exhibited quite different behavior depending on the samples. With the probability plot, the microscopic uniformity is carefully analyzed and discussed. It is proposed that probability plots can be divided into three regions, representing large grains, grains whose sizes follow the lognormal rule and small grains, respectively. With the proposed method, it is possible to obtain more quantitative information, which is of significance for the further development of ZnO-based varistor ceramics and other advanced materials. © 2018 IEEE.

Keyword :

Grain-grain boundaries Grain growth mechanisms Grain size distribution Log-normal distribution Macroscopic properties Probability plot Quantitative information Zno-based varistor ceramics

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GB/T 7714 Zhang, Lei , Yu, Chuan , Zhang, Le et al. A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics [C] . 2018 .
MLA Zhang, Lei et al. "A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics" . (2018) .
APA Zhang, Lei , Yu, Chuan , Zhang, Le , Liu, Wenfeng , Wu, Kangning , Li, Shengtao et al. A Statistical Approach for Effectively Analyzing the Grain Size Distribution Along the Thickness Direction in Commercial ZnO-Based Varistor Ceramics . (2018) .
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Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point EI SCIE Scopus
期刊论文 | 2017 , 712 , 1-6 | JOURNAL OF ALLOYS AND COMPOUNDS | IF: 3.779
WoS CC Cited Count: 8 SCOPUS Cited Count: 8
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Abstract :

The piezoelectric performance, both weak-signal piezoelectric coefficient d(33) or large-field electrostrain, were systemically measured from room temperature until their Curie temperature. Large piezoelectric coefficient d(33) of 920 pC/N was found on the boundary between the tetragonal (T) and the orthorhombic (O) phase (around 50 degrees C) rather than the quadruple point with lowest free energy barrier. Further simulation work based on the Landau free energy function also supported the experimental results, owing to the joint effect of the anisotropy energy and the order parameter polarization. Besides, the electrostrain of 0.15% with small hysteresis was also found on the O-T boundary. Systemically study pointed out that polarization rotation would have a significant contribution to the overall piezoelectric response. (C) 2017 Elsevier B.V. All rights reserved.

Keyword :

MPB Ceramics Lead-free Ferroelectric Piezoelectric

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GB/T 7714 Liu, Wenfeng , Wang, Jiageng , Ke, Xiaoqin et al. Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point [J]. | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 712 : 1-6 .
MLA Liu, Wenfeng et al. "Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point" . | JOURNAL OF ALLOYS AND COMPOUNDS 712 (2017) : 1-6 .
APA Liu, Wenfeng , Wang, Jiageng , Ke, Xiaoqin , Li, Shengtao . Large piezoelectric performance of Sn doped BaTiO3 ceramics deviating from quadruple point . | JOURNAL OF ALLOYS AND COMPOUNDS , 2017 , 712 , 1-6 .
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Structure-Dominated Failure of Surge Arresters by Successive Impulses EI SCIE Scopus
期刊论文 | 2017 , 32 (4) , 1907-1914 | IEEE TRANSACTIONS ON POWER DELIVERY | IF: 3.35
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

This paper investigates the influence of structure on the failure of full-scale metal-oxide arresters under successive lightning impulses. Typical structures of arresters are compared by simulation and experiment. With a finite-element model for the electrical-thermal multiple-field analysis, the thermal characteristics of typical structures of full-scale arresters under successive impulses are obtained. It is revealed that the filled solid insulation can contribute to more radial heat dissipation than filled gas. Experimentally, two full-scale arresters with different structures were exposed to successive nominal lightning impulses until failure, and it is found that the impulse failures of arresters are dominated by the structure and component. Surface flashover is the most common destruction for the varistor column. The cylinder type of varistors is suggested rather than hollow type, and the sleeve for position constraint of the cylinder varistor column should not be organic in order to avoid carbonization by arc discharge. It is found that the metallic spacers can contribute to sprayed-electrode protection, arc extinction, and heat dissipation. Based on the aforementioned results, an advanced arrester with structure optimization is proposed.

Keyword :

failure analysis Surge protection arresters structure impulse

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GB/T 7714 He, Jinqiang , Lin, Jiajun , Liu, Wenfeng et al. Structure-Dominated Failure of Surge Arresters by Successive Impulses [J]. | IEEE TRANSACTIONS ON POWER DELIVERY , 2017 , 32 (4) : 1907-1914 .
MLA He, Jinqiang et al. "Structure-Dominated Failure of Surge Arresters by Successive Impulses" . | IEEE TRANSACTIONS ON POWER DELIVERY 32 . 4 (2017) : 1907-1914 .
APA He, Jinqiang , Lin, Jiajun , Liu, Wenfeng , Wang, Hui , Liao, Yongli , Li, Shengtao . Structure-Dominated Failure of Surge Arresters by Successive Impulses . | IEEE TRANSACTIONS ON POWER DELIVERY , 2017 , 32 (4) , 1907-1914 .
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Electrical-Thermal Failure of Metal-Oxide Arrester by Successive Impulses EI SCIE Scopus
期刊论文 | 2016 , 31 (6) , 2538-2545 | IEEE TRANSACTIONS ON POWER DELIVERY | IF: 3.218
WoS CC Cited Count: 5 SCOPUS Cited Count: 7
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Abstract :

This paper focuses on the electrical-thermal multiple-field analysis on degradation and failure of an 110 kV-class surge arrester subjected to successive lightning current impulses by experiment and simulation. Performance deterioration of the arrester under successive 8/20 mu s lightning strikes was measured. Deterioration steps of V - I characteristics and residual voltage of arrester were detected, revealing a failure threshold of impulse number to evaluate the initial failure of the varistor column. The impulse failures of ZnO varistors were mainly caused by surface flashover and puncture. It is found that the appropriate arrangement of metallic spacers along the column can terminate the consecutive failure of ZnO varistors. To characterize the electrical-thermal effect on impulse degradation, the transient nonlinear finite-element program by an axisymmetric 2-D arrester model was developed to solve the heat generation/dissipation of an arrester during successive impulses. With the combined results of simulation and experiment, it is proved that the discrepancies of heat generation/dissipation along the varistor column cause the arcuate electrical-thermal energy distribution, indicating that degradation of an arrester under successive impulses is governed by the electric-thermal coupling interaction effect.

Keyword :

surge protection electrical-thermal interaction lightning finite-element method Arrester failure analysis

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GB/T 7714 Li, S. T. , He, J. Q. , Lin, J. J. et al. Electrical-Thermal Failure of Metal-Oxide Arrester by Successive Impulses [J]. | IEEE TRANSACTIONS ON POWER DELIVERY , 2016 , 31 (6) : 2538-2545 .
MLA Li, S. T. et al. "Electrical-Thermal Failure of Metal-Oxide Arrester by Successive Impulses" . | IEEE TRANSACTIONS ON POWER DELIVERY 31 . 6 (2016) : 2538-2545 .
APA Li, S. T. , He, J. Q. , Lin, J. J. , Wang, H. , Liu, W. F. , Liao, Y. L. . Electrical-Thermal Failure of Metal-Oxide Arrester by Successive Impulses . | IEEE TRANSACTIONS ON POWER DELIVERY , 2016 , 31 (6) , 2538-2545 .
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Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance EI CPCI-S Scopus
会议论文 | 2016 , 282-286 | International Conference on Condition Monitoring and Diagnosis (CMD)
WoS CC Cited Count: 4 SCOPUS Cited Count: 4
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Abstract :

Breakdown of power capacitor major insulation is one of the most severe reasons causing capacitor failure, even explosions. Long term operation in partial discharge (PD) environment can result in accelerated degradation of major insulation, and lead to breakdown ultimately. In this paper, partial discharge performance between terminal and container of a power capacitor was studied, and a typical PD model was employed to analyze different insulation designs. Based on the results, the relationship between different major insulation designs and partial discharge performance was discussed, and an optimized major insulation design was provided, which can contribute to the improvement of capacitor reliability in the future.

Keyword :

partial discharge major insulation power capacitor insulation design

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GB/T 7714 Cheng Lu , Li Zhou , Liu Wenfeng . Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance [C] . 2016 : 282-286 .
MLA Cheng Lu et al. "Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance" . (2016) : 282-286 .
APA Cheng Lu , Li Zhou , Liu Wenfeng . Design Optimization of Power Capacitor Major Insulation based on Partial Discharge Performance . (2016) : 282-286 .
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Preparation and properties of BaTiO3 ceramics from the fine ceramic powder EI SCIE Scopus
期刊论文 | 2015 , 41 , S111-S116 | CERAMICS INTERNATIONAL | IF: 2.758
WoS CC Cited Count: 6 SCOPUS Cited Count: 5
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In the present study, the BaTiO3 ceramic from fine powder with the average particle size of 400 nm and with high tetragonality of 1.0103 was fabricated via solid-state route by employing two step pre-treatments. One is the wet ball milling of the commercially available BaCO3 powder which solved the agglomeration problem and increased the contact points during calcination. The other one is the dry milling of the calcined BaTiO3 powder which separated the powder into single particles and enhanced the stacking density during sintering. The obtained BaTiO3 ceramics showed enhanced dielectric constant of 12,000 at Curie temperature of 125 degrees C, ferroelecttic remnant polarization of 5.33 mu C/cm(2) and coercive field of 163 V/mm. Besides, the improved BaTiO3 ceramics showed piezoelectric constant d(33) of 200 pC/N, which was enhanced by 53.8% from the 130 pC/N of the normal BaTiO3 ceramic. (C) 2015 Published by Elsevier Ltd and Techna Group S.r.l

Keyword :

Dielectric response Piezoelectric Ferroelectric Solid-state reaction Barium titanate

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GB/T 7714 Zhao, Xia , Liu, Wenfeng , Chen, Wei et al. Preparation and properties of BaTiO3 ceramics from the fine ceramic powder [J]. | CERAMICS INTERNATIONAL , 2015 , 41 : S111-S116 .
MLA Zhao, Xia et al. "Preparation and properties of BaTiO3 ceramics from the fine ceramic powder" . | CERAMICS INTERNATIONAL 41 (2015) : S111-S116 .
APA Zhao, Xia , Liu, Wenfeng , Chen, Wei , Li, Shengtao . Preparation and properties of BaTiO3 ceramics from the fine ceramic powder . | CERAMICS INTERNATIONAL , 2015 , 41 , S111-S116 .
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Effect of starting raw materials on the dielectric, ferroelectric and electro-shape-memory properties of Mn3+ doped (Pb40Sr60)TiO3 ceramics EI SCIE Scopus
期刊论文 | 2014 , 25 (1) , 510-515 | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS | IF: 1.569
WoS CC Cited Count: 1
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Abstract :

The effect of starting raw materials on the dielectric, ferroelectric and electro-shape-memory properties of 0.5 mol% Mn3+ doped (Pb40Sr60)TiO3 ceramics was systematically studied. SEM observation showed that the ceramics fabricated from Pb3O4, SrCO3, TiO2 and MnCO3 possessed the most homogeneous microstructure and the largest grain size. As the macroscopic consequence, such ceramics exhibited large dielectric property and well-developed double hysteresis loop. More interestingly, it showed large digital-like recoverable electrostrain of 0.11 % under the electric field of 3 kV/mm, which can rival the widely used linear piezoelectricity of the hard PZT ceramics. Defect distribution within the large and homogenous grains was analyzed to explore the microscopic origin of the simultaneous domain switching behavior and the digital-like strain properties. Such feature indicated the importance of material processing on the on/off-characterized electromechanical applications.

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GB/T 7714 Liu Wenfeng , Zhang Lixue , Chen Wei et al. Effect of starting raw materials on the dielectric, ferroelectric and electro-shape-memory properties of Mn3+ doped (Pb40Sr60)TiO3 ceramics [J]. | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2014 , 25 (1) : 510-515 .
MLA Liu Wenfeng et al. "Effect of starting raw materials on the dielectric, ferroelectric and electro-shape-memory properties of Mn3+ doped (Pb40Sr60)TiO3 ceramics" . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS 25 . 1 (2014) : 510-515 .
APA Liu Wenfeng , Zhang Lixue , Chen Wei , Li Shengtao . Effect of starting raw materials on the dielectric, ferroelectric and electro-shape-memory properties of Mn3+ doped (Pb40Sr60)TiO3 ceramics . | JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS , 2014 , 25 (1) , 510-515 .
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Effect of spark plasma sintering temperature on the phase equilibria and dielectric properties of BaTi2O5 ceramics EI SCIE Scopus
期刊论文 | 2014 , 49 (22) , 7908-7914 | JOURNAL OF MATERIALS SCIENCE | IF: 2.371
WoS CC Cited Count: 1
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The effect of sintering temperature (ranging from 1055 to 1200 A degrees C) on the phase ingredient and dielectric property of the nominal BaTi2O5 ceramics (starting with the Ba/Ti of 1:2) fabricated by a spark plasma sintering method were systematically studied. At the first stage, BaTi2O5 component was enhanced in the sintering temperature range of 1055-1120 A degrees C; it turned out to be the dominant phase. For these BaTi2O5 phase dominated ceramics, the Curie temperature T (c) rised on increasing the sintering temperature and saturated around 440 A degrees C with the maximum dielectric constant of 500. Further increasing the sintering temperature, the decomposition of the obtained BaTi2O5 into BaTiO3 extensively happened; the ceramics turned to be the BaTi2O5 and BaTiO3 coexisting state. These ceramics can be characterized by two dielectric anomalies. One at similar to 420 A degrees C stood for the phase transition of BaTi2O5 while the other at similar to 150 A degrees C stood for the transition of BaTiO3, which is exceptionally high as the normal BaTiO3 ceramics. Further increasing the sintering temperature (until 1200 A degrees C) would dramatically enhance the BaTiO3 phase; the ceramics showed T (c) at 130 A degrees C with the maximum dielectric constant of 1800.

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GB/T 7714 Liu, Wenfeng , Tsukada, Shinya , Li, Shengtao et al. Effect of spark plasma sintering temperature on the phase equilibria and dielectric properties of BaTi2O5 ceramics [J]. | JOURNAL OF MATERIALS SCIENCE , 2014 , 49 (22) : 7908-7914 .
MLA Liu, Wenfeng et al. "Effect of spark plasma sintering temperature on the phase equilibria and dielectric properties of BaTi2O5 ceramics" . | JOURNAL OF MATERIALS SCIENCE 49 . 22 (2014) : 7908-7914 .
APA Liu, Wenfeng , Tsukada, Shinya , Li, Shengtao , Akishige, Yukikuni . Effect of spark plasma sintering temperature on the phase equilibria and dielectric properties of BaTi2O5 ceramics . | JOURNAL OF MATERIALS SCIENCE , 2014 , 49 (22) , 7908-7914 .
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