Dielectric properties of barium titanate and alumina filled epoxy

Frost, Nancy; McGrath, P.B.

doi:10.1109/ceidp.1995.483788

Cited by 10 publications

(18 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In addition, ceramics and powders of BaTiO3 can show a different dielectric behaviour, depending on particle size and packing as well as the electric stress, so their employment as a filler to enhance relative permittivity can vary considerably. Figure 6 shows the measured relative permittivity of micron size BaTiO3 in epoxy resin for volume fractions to 30 percent [14]. The increase in relative permittivity is generally consistent with those reported in the literature for other composites [12,25].…”

Section: Introductionsupporting

confidence: 87%

“…A relative permittivity less than 50 has been reported for 40 nm A1203 coated 3 gm Al filler particles [26]. Bailum Titarate Vol % Figure 6: Relative permittivity ofbarium titanate in epoxy resin [14].…”

Section: Introductionmentioning

confidence: 98%

“…This is a method of reducing the electrical stress on the surface of insulation thereby minimizing the effects of arcing on the surface. Again, many studies have been reported on the increased relative permittivity that is obtained as a function of concentration and type of filler [11][12][13][14][15][16][17]; however, at this time there are no known commercial applications of these materials to the housings of bushings where a significant stress relief on the surface of the insulation can be obtained.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon based powders which are used in indoor stress relief applications cannot be considered for outdoor applications as heat from dry band arcing would most certainly release carbon forming tracks, leading to failure by tracking. Fillers such as BaTiO3, TiO2, and metal powders have been investigated for possible use in outdoor insulation [14,17] and extensive studies of the ferroelectric ceramic as a filler has been studied [15] and particle size, shape and concentration all play a role in the relative permittivity that can be attained in a 4 1. [31].…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Silicone rubber dielectrics modified by inorganic fillers for outdoor high voltage insulation applications

Cherney

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.

View full text Add to dashboard Cite

The paper discusses the mechanisms by which inorganic fillers in silicone rubber dielectrics enhance the properties of thermal conductivity, relative permittivity, and electrical conductivity making them useful in outdoor high voltage insulation applications. The addition of alumina tri-hydrate or silica fillers to silicone elastomers, forming binary composites with enhanced thermal conductivity, is discussed in relation to filler type, particle size, shape, and concentration, and its use as a housing material for non-ceramic insulators to minimize material erosion at dry band arcing sites by lowering hot spot temperature. Also discussed is the enhanced relative permittivity of silicone dielectrics that is obtained through the addition of barium titanate powder which can be further increased with the addition of aluminium powder forming a tertiary composite, resulting in a significant grading of the surface electric field when applied as a housing material to high voltage bushings. Controlled electrical conductivity of silicone dielectrics is discussed through the use of antimonydoped tin oxide filler binary composites and when applied as a housing material to outdoor bushings, the pollution performance is greatly enhanced.

show abstract

Section: Introductionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Silicone rubber dielectrics modified by inorganic fillers for outdoor high voltage insulation applications

Cherney

CEIDP '05. 2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, 2005.

View full text Add to dashboard Cite

show abstract

“…Carbon based powders which are used in indoor stress relief applications cannot be considered for outdoor applications as heat from dry band arcing would most certainly release carbon forming tracks, leading to failure by tracking. Fillers such as Al 2 O 3 , BaTiO 3 , TiO 2 , and metal powders have been investigated for possible use in outdoor insulation [36,37] and extensive studies of the ferroelectric ceramics as filler have been studied [38], It is reported that particle size, shape and concentration all play a role in the relative permittivity that can be attained in such composites [39].…”

Section: Dielectric Propertiesmentioning

confidence: 99%

Effects of Ph<sub>12</sub>SQ on the thermal stability and mechanical properties of high temperature vulcanized (HTV) silicone rubber

Moghadam

Morshedian

Ehsani

et al. 2014

IEEE Trans. Dielect. Electr. Insul.

View full text Add to dashboard Cite

Ph 12 SQ (C 6 H 5 SiO 1.5 ) 12 was blended into a polydimethylsiloxane (PDMS) based HTV silicone rubber as a reinforcing filler at loadings of (0, 2.5, 5, 10, 15, 20% by weight). The thermal stabilities and mechanical properties of these HTV silicone rubber composites were studied by thermal gravimetric analysis (TGA) and tensile testing, respectively. Dispersions of Ph 12 SQ were characterized by scanning electron microscopy (SEM). The obtained results show the presence of SQ-rich regions that affect the thermal stabilities and mechanical properties of HTV silicone rubber. TGA shows that T d1% is delayed from approximately 215 C for DD 0 to 350 C (DD 20 ) (about 130C) and the T d5% mass loss exhibits a similar trend. The thermo-oxidative stability also increases with Ph 12 SQ weight fraction. Also, the tensile strength and elongation at break of these HTV silicone rubbers increase from 8.8 to 11 MPa and 655 to 950 % with incremental loading of Ph 12 SQ to 5 wt% (DD 5 ). Moreover, the addition of Ph 12 SQ increases its relative permittivity from 3.2 to 14.2 and the dissipation factor at 1 MHz increases from 0.01 to 0.05. Finally, the values of T d5% at different heating rates were applied for comparison of the lifetime of DD 0 and DD 5 samples according to the D&R model. The results show that DD 5 offers a longer lifetime than DD 0 at different temperatures. He has advised nearly 100 M.S. and Ph.D. students with whom he has published over 200 papers and three books in structure-rheology correlation, polymer processing, and particularly reaction compounding with internal mixers and extruders for modified properties. Chemical, and radiation crosslinking of polyolefin is chief among his research work.

Dielectric properties of barium titanate and alumina filled epoxy

Cited by 10 publications

References 4 publications

Silicone rubber dielectrics modified by inorganic fillers for outdoor high voltage insulation applications

Silicone rubber dielectrics modified by inorganic fillers for outdoor high voltage insulation applications

Effects of Ph<sub>12</sub>SQ on the thermal stability and mechanical properties of high temperature vulcanized (HTV) silicone rubber

Nonlinear characteristics of filled resins under alternating fields

Contact Info

Product

Resources

About