Effect of Agglomerate Size on AC Breakdown Strength of TiO&lt;sub&gt;2&lt;/sub&gt;/Epoxy Nanocomposites

Tagawa, Kazuma; Kurimoto, Muneaki; Yoshida, Seikoh; Umemoto, Takuya; Mabuchi, Takuya; Muto, Hirotaka

doi:10.1541/ieejfms.142.159

Cited by 6 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This mechanism is believed to be influenced by the electric field enhancement around the agglomerates. Previous studies have examined the effects of electric field enhancement based on the assumption of spherical agglomerates [12]. However, depending on the types of nanofillers and the manufacturing processes of the required nanocomposites, certain agglomerates can have three-dimensional (3D) asymmetric shapes [13].…”

Section: Introductionmentioning

confidence: 99%

Electric field distribution around asymmetric agglomerate model reconstructed from FIB–SEM images of epoxy nanocomposite

Tagawa

Kurimoto

Sawada³

et al. 2023

IET Nanodielectrics

Self Cite

View full text Add to dashboard Cite

This study focussed on determining the electric field distribution formed by asymmetric agglomerates in order to elucidate the mechanism by which large agglomerates reduce the dielectric breakdown strength of nanocomposites. Epoxy nanocomposite sample was prepared by adding 2.5 vol% of TiO 2 nanoparticles with a primary particle size ranging from 30 to 50 nm. The three-dimensional (3D) structure of the epoxy nanocomposites with a thickness of 5 μm was analysed via focussed ion beam and scanning electron microscopy. The 3D reconstruction was performed using 250 observation images, and a 3D model of the particle in the observational range was obtained. The electric field distribution for the 3D model of the agglomerate with the largest size was determined using the finite element method. In addition, we constructed a calculation model that effectively accommodate changes in the direction of the applied electric field. Subsequently, we examined the changes in the maximum electric field intensity around the agglomerate.

show abstract

Section: Introductionmentioning

confidence: 99%

Electric field distribution around asymmetric agglomerate model reconstructed from FIB–SEM images of epoxy nanocomposite

Tagawa

Kurimoto

Sawada³

et al. 2023

IET Nanodielectrics

Self Cite

View full text Add to dashboard Cite

show abstract

“…One kind of such advanced insulating materials explored by researchers is epoxy nanocomposites in which nano-sized particles and platelets are used as fillers in epoxy resin to tree-discharge paths. [1][2][3][4] However, it is difficult to disperse the filler uniformly, and experiments confirmed decline in breakdown strength caused by filler agglomerates 5 .…”

Section: Introductionmentioning

confidence: 99%

Electrical treeing phenomena in two‐layer silicone gel with different crosslinking degrees and its dielectric strength

Kuroda

Jeon

Ihori

2023

Electrical Engineering Japan

View full text Add to dashboard Cite

Silicone gel is widely used to encapsulate power modules, and improvement of its dielectric strength has been required. So, the purpose of our research is to improve dielectric strength of silicone gel encapsulant, and we focus on crosslinking degree of silicone gel. Previous studies have shown that growth mechanism of electrical tree changes with crosslinking degree of silicone gel. This suggests the possibility that the presence of the interface by different crosslinking degrees inhibits the tree growth. In this paper, we have investigated the tree growth and breakdown characteristics in silicone gel—crosslinking degrees graded layer materials. The interfaces in our study are arrange as being vertical to the line of electric force. Consequently, it was clarified that barrier effect of interface by different crosslinking degrees and the relaxation of electric field in low crosslinking degree region retards on tree growth, which improves the dielectric strength.

show abstract

AC breakdown characteristics of ultra violet curable epoxy resin with nitrogen fine bubbles

Araoka,

Takamura,

Inoue

et al. 2024

Electrical Engineering Japan

View full text Add to dashboard Cite

We investigated AC breakdown characteristics of ultra violet curable epoxy resin (UV‐EP) with nitrogen fine bubbles (FBs) in order to improve insulating properties of UV‐EP. As a result, it was found that self‐made FB generator mainly add FBs with a diameter between 60 and 150 nm to FB‐EP before curing. In addition, SEM images revealed that FB‐EP has FBs after curing. Bubble diameter in FB‐EP after curing was estimated between 55 and 140 nm due to resin shrinkage. Furthermore, partial discharge inception voltage and electric strength of FB‐EP with FB addition for 10 min were almost the same as No FB‐EP.

show abstract

Effect of Agglomerate Size on AC Breakdown Strength of TiO<sub>2</sub>/Epoxy Nanocomposites

Cited by 6 publications

References 10 publications

Electric field distribution around asymmetric agglomerate model reconstructed from FIB–SEM images of epoxy nanocomposite

Electric field distribution around asymmetric agglomerate model reconstructed from FIB–SEM images of epoxy nanocomposite

Electrical treeing phenomena in two‐layer silicone gel with different crosslinking degrees and its dielectric strength

AC breakdown characteristics of ultra violet curable epoxy resin with nitrogen fine bubbles

Contact Info

Product

Resources

About