Influence of temperature on mechanical and insulation properties of epoxy-layered silicate nanocomposite

Imai, T.; Sawa, Fumio; Ozaki, T.; Shimizu, Toshio; Kido, Ryō; Kozako, Masahiro; Tanaka, Toshikatsu

doi:10.1109/tdei.2006.1624291

Cited by 106 publications

(51 citation statements)

References 19 publications

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“…In general, epoxy resin is essential for heavy apparatus systems, not only for electric rotating machinery, but for static mold machinery as well. The epoxy resin needs to be filled by certain micro scaled fillers (silica or alumina) in order to obtain a low thermal expansion needed by some conductors, such as aluminum or copper [2]. The conventional filled epoxy with low thermal expansion avoids the exfoliation that occurs between conductors caused by thermal cycles or epoxy casting sections.…”

Section: Introductionmentioning

confidence: 99%

The Properties of DSC and DMA for Epoxy Nano-and-Micro Mixture Composites

Lee¹,

Park²

2010

Transactions on Electrical and Electronic Materials

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As noted in Table 1, the epoxy resins that are not made with nano-fillers are referred to as conventional epoxy resins and the composites in which the conventional micro scaled epoxies are made with nano-fillers are referred to as epoxy nano-and-micro mixture composites (ENMCs). Three different ENMCs were fabricated with the composition ratios shown in Table 1.As this table shows, all of the epoxies were made with the same basic ratios of resin, hardener, and microparticles. The three different ENMCs are differentiated by nano SiO 2 concentrations of 0.5, 1, and 5 phr. In addition, this study looked at the effects of the silane processing (silane coupling agent: KBE_903_2.5 phr) for the micro composites. Keywords:Epoxy nano-and-micro mixture composites, Microcomposites, Cross-linking density, Differential scanning calorimeter, Dynamic mechanical analyser This study investigates the thermal and mechanical properties of insulation elements through the mixing of epoxy based micro and nano particles. Regarding their thermal properties, differential scanning calorimeter and dynamic mechanical analyser were used to calculate the cross-linking densities for various types of insulation elements. The mechanical properties of the bending strength, the shape and scale parameters, were obtained using the Weibull plot. This study obtained the best results in the scale parameters, at 0.5 phr, for the bending strength of the epoxy nanoand-micro mixture composites.

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Section: Introductionmentioning

confidence: 99%

The Properties of DSC and DMA for Epoxy Nano-and-Micro Mixture Composites

Lee¹,

Park²

2010

Transactions on Electrical and Electronic Materials

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“…In recent years, many researchers have focused on the application of nano-sized fillers on a polymer matrix [4][5][6][7] because polymer nanocomposites have much better insulation characteristics than neat polymers without nanofiller. It was also found that nanofillers improved the electrical and mechanical properties of polymers.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ambient Temperature on Insulation Lifetime of Winding Coil Prepared with Polyamideimide/Nanosilica Enamelled Wire

Park¹,

Woo²,

Lee³

et al. 2016

Transactions on Electrical and Electronic Materials

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The effects of ambient temperature and diameter on the insulation lifetime of winding coils prepared with polyamideimide (PAI), flexural PAI (nanosilica 5 wt%) and anti-corona PAI (nanosilica 15 wt%) wires were investigated. The winding coils were made of enameled wire with enamel thickness of 30~50 μm. The thickness and width of the rectangular copper wires were 0.77~0.83 mm and 1.17~1.23 mm, respectively. The insulation breakdown lifetime decreased with increasing ambient temperature regardless of wire type and winding coil diameter under an inverter surge of 1.5 kV/20 kHz. The insulation breakdown lifetimes of φ5 mm winding coils at 150, 200, and 250℃ were 11.38, 5.19, and 4.22 min respectively, and those of φ10 mm winding coils at 150, 200, and 250℃ were 11.32, 5.79, and 4.57min respectively. The winding coil diameter had little effect on the insulation lifetime.

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“…Mülhaupt and co-workers [5] demonstrated that toughness and stiffness of epoxy resin were modified by adding nano-sized mica, bentonite or hectorite. T. Tanaka and co-workers [6] demonstrated that epoxy/layered silicate nanocomposite had much better insulation breakdown strength than that of the nonfilled epoxy resin system in needle-plate electrodes geometry. We have already reported that its insulation breakdown strength was 33% higher than that of the system without nano-silicate [7].…”

Section: Introductionmentioning

confidence: 99%

Long-term and Short-term AC Treeing Breakdown of Epoxy/Micro-Silica/Nano-Silicate Composite in Needle-Plate Electrodes

Park¹

2012

Transactions on Electrical and Electronic Materials

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In order to characterize insulation properties of epoxy/micro-silica/nano-silicate composite (EMNC), long-term and short-term AC treeing tests were carried out undr non-uniform electric field generated between needle-plate electrodes. In a long-term test, a 10 kV (60 Hz) electrical field was applied to the specimen positioned between the electrodes with a distance of 2.7 mm in an insulating oil bath at 30℃, and a typical branch type electrical tree was observed in the neat epoxy resin and breakdown took place at 1,042 min after applying the 10 kVelectrical field. Meanwhile, the spherical tree with the tree length of 237 μm was seen in EMNC-65-0.3 at 52,380 min (36.4 day) and then the test was stopped because the tree propagation rate was too low. In the short-term test, an electrial field was applied to a 3.5 mm-thick specimen at an increasing voltage rate of 0.5 kV/s until breakdown in insulating oil bath at 30℃ and 130℃, and the data was estimated by Weibull statistical analysis. The electrical insulation breakdown strength for neat epoxy resin was 1,763 kV/mm at 30℃, while that for EMNC-65-0.3 was 2,604 kV/mm, which was a modified value of 47%. As was expected, the breakdown strength decreased at higher test temperatures.

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Influence of temperature on mechanical and insulation properties of epoxy-layered silicate nanocomposite

Cited by 106 publications

References 19 publications

The Properties of DSC and DMA for Epoxy Nano-and-Micro Mixture Composites

The Properties of DSC and DMA for Epoxy Nano-and-Micro Mixture Composites

Effect of Ambient Temperature on Insulation Lifetime of Winding Coil Prepared with Polyamideimide/Nanosilica Enamelled Wire

Long-term and Short-term AC Treeing Breakdown of Epoxy/Micro-Silica/Nano-Silicate Composite in Needle-Plate Electrodes

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