Effect of BN nanosheet concentration on space charge characteristics in XLPE/BNNS nanocomposites

Li, Guochang; Zhou, Xuguang; Wei, Yanhui; Hao, Chuncheng; Liu, Qingquan

doi:10.1088/2053-1591/ab4bf4

Cited by 14 publications

(12 citation statements)

References 22 publications

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“…For the low concentration, it has been observed that space charge can be effectively inhibited by the pulse electro‐acoustic (PEA) method in our previous work. [ 3 ] The formation of deep traps at the interface between the electrode and the composite will inhibit the further injection of interface charge, resulting in the reduction of free moving electrons. With the increase in the concentration, the interface charges gradually migrate to the composite bulk, and the “charge barrier effect” becomes weaken.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

Effect of Boron Nitride Concentration and Morphology on Dielectric and Breakdown Properties of Cross‐Linked Polyethylene/Boron Nitride Nanocomposites

Zhou

Yang

et al. 2021

Adv Eng Mater

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Nanocomposite dielectric is considered the most promising insulation material for high‐voltage direct current cables. Herein, boron nitride nanoparticles (BNNPs) and boron nitride nanosheets (BNNSs) are used as nanofillers to study the effect of nanofiller concentration and morphology on the electrical properties of cross‐linked polyethylene (XLPE) composite based on experiments and simulation. The experimental results indicate that nanofiller concentration has a great influence on permittivity, while the influence of the morphology at the same concentration is small. The maximum relative permittivity occurs at 1 wt%. They are 2.35 and 2.32, respectively, for XLPE/BNNSs and XLPE/BNNP, increasing by about 11% and 9% than that of XLPE matrix. The morphology of BN significantly influence the breakdown performance, and the breakdown strength of the nanocomposite increases first and then decreases with the increase in doping concentration. The maximum breakdown strength of the composite occurs at 0.5 wt%. They are 403.8 and 349.2 kV mm−1, respectively, for XLPE/BNNSs and XLPE/BNNP, which is about 33% and 13% higher than that of XLPE matrix. Molecular simulations show that the free volume of XLPE/BNNSs is lower than that of XLPE/BNNP. In addition, the sheet structure can effectively block the carrier transport and prolong the discharge path.

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Section: Experimental Results and Analysismentioning

confidence: 99%

Effect of Boron Nitride Concentration and Morphology on Dielectric and Breakdown Properties of Cross‐Linked Polyethylene/Boron Nitride Nanocomposites

Zhou

Yang

et al. 2021

Adv Eng Mater

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“…When the concentration of BNNSs is high, the interaction zones between matrix and nanofillers may overlap, which will provide a low‐resistance path for electrons, and accelerate charge carriers transport through the amorphous zone. It has been studied that shallow traps are introduced owing to physical contact among BNNSs when the concentration of BNNS is high [27]. The trap level is 0.62 eV and the trap density is 5.76 × 10 20 m 3 when BNNS concentration is 5 wt%.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…When the specimen was applied electric field of 20 kV/mm for 30 min, some parts of charges will be injected into the specimen, which will affect the breakdown process. It has been measured that the accumulated charge amount of pure XLPE stressed of 20 kV/mm is about 1.08 × 10 −5 C by pulsed electro‐acoustic (PEA) method [27]. The homo‐charges near the electrode will weaken the applied electric field, inhibiting the interfacial charge injection, thus improving the breakdown strength.…”

Section: Experimental Results and Analysismentioning

confidence: 99%

“…It inhibits the carrier transport, and significantly enhances the breakdown strength of XLPE/BNNSs. Space charge and trap characteristics of XLPE/BNNSs have been specially studied in our previous work [27]. It indicates that the deep traps [31][32][33] are introduced between the matrix and nanofiller when a small amount of BNNS is doped into XLPE.…”

Section: Effect Of Bnnss Concentration On Breakdown Characteristicmentioning

confidence: 99%

“…Especially, the high thermal conductivity and excellent electrically insulating properties of BNNSs have great potential for fabricating electrically insulating materials. Our previous studies have shown that the addition of BNNSs can effectively inhibit the space charge accumulation in XLPE/BNNSs and improve the insulation performance of the composite [27].…”

Section: Introductionmentioning

confidence: 99%

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DC breakdown characteristics of XLPE/BNNS nanocomposites considering BN nanosheet concentration, space charge and temperature

Zhou

et al. 2020

High Voltage

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Breakdown failure in insulation material is one of the key problems that threaten the safe operation of high-voltage direct current cable. In this work, the effect of boron nitride nanosheets (BNNSs) concentration, space charge and temperature on DC breakdown strength have been explored. Cross-linked polyethylene (XLPE)/BNNS nanocomposites were prepared by the melt blending method, and the basic characteristics of nanoparticles and composite were characterised. The experimental results indicate that DC breakdown strength of nanocomposite can be effectively improved when a small amount of BN nanosheet is doped into the matrix. The breakdown strength of the sample reaches the maximum value of 407.52 kV/mm when BNNS content is 0.5 wt%, which is about 33% higher than that of pure XLPE. Further, the effect of space charge on the breakdown of nanocomposites has been studied by pre-injecting charges. For the samples with different BNNS contents, all the breakdown strength present ascending trend when the polarity of the applied voltage is the same as that of the pre-injected charges. Besides, it can be found that the breakdown strength of the XLPE/BNNSs composite decreases significantly at 50°C, which is due to more charge accumulation at 50°C. It reaches 2.06 × 10 −8 C which increases by about 2.2 times than the room temperature.

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Voltage stabilizer and nanofiller in enhancement of insulation properties of cross‐linked polyethylene

Chen

Hong

Dai

et al. 2022

J of Applied Polymer Sci

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This paper investigates the influence of voltage stabilizer and nanofiller addition on the insulation performance of the cross-linked polyethylene (XLPE). The test samples of XLPE/stabilizer blends consisting of 1 wt% maminobenzoic acid, XLPE nanocomposites consisting of 0.5 wt% nano MgO and XLPE hybrid composite consisting of both voltage stabilizer and nanofillers were prepared. Various physicochemical and electrical properties were measured to analyze the performance of prepared samples. The obtained results show that the addition of nanofillers deteriorates the electrical insulation performance of the XLPE. On the other hand, the voltage stabilizer addition proves to be suitable for enhancing the electrical insulation performance of the XLPE. Meanwhile, the hybrid XLPE composites have shown medium behavior. The voltage stabilizer addition reduces, but the nanofillers increase the space charge density inside the XLPE compared to pure XLPE. It is also found that the dispersion of the voltage stabilizer in the material is uniform, whereas the nanofillers are aggregated. Furthermore, both additives slightly improve the thermal stability of the XLPE. The trap level theory based on quantum chemical calculation is proposed to explain the influence mechanism of the additives on the XLPE.

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Effect of BN nanosheet concentration on space charge characteristics in XLPE/BNNS nanocomposites

Cited by 14 publications

References 22 publications

Effect of Boron Nitride Concentration and Morphology on Dielectric and Breakdown Properties of Cross‐Linked Polyethylene/Boron Nitride Nanocomposites

Effect of Boron Nitride Concentration and Morphology on Dielectric and Breakdown Properties of Cross‐Linked Polyethylene/Boron Nitride Nanocomposites

DC breakdown characteristics of XLPE/BNNS nanocomposites considering BN nanosheet concentration, space charge and temperature

Voltage stabilizer and nanofiller in enhancement of insulation properties of cross‐linked polyethylene

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