Enhancement in electrical and thermal performance of high‐temperature vulcanized silicone rubber composites for outdoor insulating applications

Azizi, Sohrab; Momen, Gelareh; Ouellet-Plamondon, Claudiane; David, Éric

doi:10.1002/app.49514

Cited by 12 publications

(4 citation statements)

References 51 publications

(60 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…13 In case of nanofillers, several studies involving popular nanofillers such as alumina (Al 2 O 3 ), silica (SiO 2 ), magnesium oxide (MgO), zinc oxide (ZnO), boron nitride (BN), and aluminum nitride (AlN) were conducted. [14][15][16][17][18][19][20][21][22] However, in choice of nanofillers, there often exists a trade-off between electrical insulating properties and thermal conductivity. Electrical resistivity of Al 2 O 3 , SiO 2 (quartz), ZnO, MgO, and BaTiO 3 at ambient conditions was reported to be between 10 12 -10 15 , 23 10 16 -10 18 , 24 10 6 , 25 10 16 , 13 10 7 -10 10 Ω m, 26 respectively.…”

Section: Introductionmentioning

confidence: 99%

Nano and micro co‐filled aluminum nitride/magnesium dihydrate—Silicone rubber composites for high voltage insulation

Ashitha,

Shanker,

Meena

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

Co‐filled composites of micro magnesium dihydrate (MDH) and hydrophobically treated nano aluminum nitride (nH‐AlN) fillers in high temperature vulcanizing silicone gum are studied for thermal and dielectric characteristics for use as an insulating material in high voltage applications. The study begins with description of the compounding protocol adopted, followed by spectroscopic and optical characterization. Fourier transform infrared spectroscopy (FTIR) and energy dispersive X‐ray spectroscopy (EDX) analysis are used to verify the presence of nH‐AlN and MDH in the composites. Thermal analysis through thermogravimetric analysis revealed a stark enhancement in the onset of polymer degradation temperature, with an improvement of 208 °C achieved at 30 phr by weight loading level of MDH. Volume resistivity of 9.71 E14 Ω‐cm is obtained at 30 phr weight loading of MDH and 5 phr of nH‐AlN. AC, +DC, and −DC dielectric strength improved by 1.09, 2.06, and 1.08 times for co‐filled composites at 30 phr MDH and 5 phr nH‐AlN loading levels over unitary filled composite. Effect of dielectric polarization on dielectric constant and dissipation factor is studied at various frequencies. Limitations while conducting dry arc resistance test at standard voltage of 12.50 kV is discussed, with modification in dry arc resistance test voltage to 16.95 kV. The results are presented and discussed here.

show abstract

Section: Introductionmentioning

confidence: 99%

Nano and micro co‐filled aluminum nitride/magnesium dihydrate—Silicone rubber composites for high voltage insulation

Ashitha,

Shanker,

Meena

et al. 2024

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

“…Rubber products are widely used in automobiles, construction, electrical appliances, medical equipment, and other fields. − Rubber materials and rubber composites have always been the focus of research. − Among other things, rubber materials in applications are subject to changing with environmental changes, such as high temperature, low temperature, acid–base, oily and organic media, and so forth, leading to changes in the properties of rubber materials and thus limiting their use. − At present, the above problems can be effectively solved by combining two or more rubbers or other materials through physical and chemical actions. , Previous studies have made significant progress in improving the properties of rubber composites. , In rubber composites, one kind of rubber is used as the matrix material, and it is a common method for researchers to select different auxiliary materials for composites. The selection of synergistic materials involves the design and preparation of materials, which can be another rubber or filler. , …”

Section: Introductionmentioning

confidence: 99%

“… 5 − 7 Among other things, rubber materials in applications are subject to changing with environmental changes, such as high temperature, low temperature, acid–base, oily and organic media, and so forth, leading to changes in the properties of rubber materials and thus limiting their use. 8 − 10 At present, the above problems can be effectively solved by combining two or more rubbers or other materials through physical and chemical actions. 11 , 12 Previous studies have made significant progress in improving the properties of rubber composites.…”

Section: Introductionmentioning

confidence: 99%

Preparation of High-Strength and Excellent Compatibility Fluorine/Silicone Rubber Composites under the Synergistic Effect of Fillers

et al. 2023

View full text Add to dashboard Cite

Fluorine/silicone composite rubber is widely used as a sealing material in aerospace, missile, automotive, petroleum, and other industries, but the traditional process does not use synergistic fillers to strengthen the composite system. In this research, fumed SiO2 and black caron (N990) were used as synergistic fillers, fluorine/silicone composite rubber was prepared by mechanical mixing process, and three different fluorine rubber systems were used to find the best composite material. The mechanical properties, thermal properties, aging properties, moderate strength properties, and microstructure of the composites were evaluated. Studies have shown that mixing the two can produce a certain interface interaction and effectively improve the compatibility. The physical properties of the material tended to decrease during the increase in the added amount of silicone rubber (MVQ). The maximum tensile strength of the hybrid material can reach 15 MPa. The optimal mixing ratio is fluororubber/silicone rubber (FKM/MVQ) = 9/1. At this time, the mechanical properties of the composite material are in the best state, and SiO2 and black caron (N990) have a reinforcing effect, which can effectively improve the mechanical properties. After the composite was kept at 200 °C for 48 h, the tensile strength and elongation of the best sample A1 were 99.5 and 97.0%, respectively, showing excellent anti-aging properties. This work provides a method to fabricate high-strength fluorine/silicone composites using synergistic fillers that may be used in heat-medium-sealed environments.

show abstract

“…With the rapid development of nuclear power, rockets, aerospace, radio, and electrical industries, the extreme working environment has higher and higher requirements for the working temperature, electrical insulation and lifespan of insulating parts [ 1 , 2 , 3 , 4 ]. The machinery also puts forward higher requirements for the complexity, surface quality, and dimensional accuracy of insulating parts.…”

Section: Introductionmentioning

confidence: 99%

Research on Postcuring Parameters Effect on the Properties of Fiberglass-Reinforced Silicone Resin Coil Bobbin

Gao

et al. 2023

Materials

View full text Add to dashboard Cite

With the growing demand for insulation parts in extreme service environments, such as nuclear power, aviation, and other related fields, fiberglass-reinforced silicone resin (FRSR) has become a popular choice due to its exceptional physical and chemical properties in high-temperature and electromagnetic working environments. To enhance the performance of FRSR molded parts that can adapt to more demanding extreme environments, the oven postcuring process parameters on thermal stability and mechanical properties of the bobbin were investigated. The curing behavior of FRSR was analyzed by using thermogravimetric analysis (TGA) and the differential scanning calorimetry (DSC) method, and the bobbins were manufactured based on the testing results. Subsequently, the bobbins were oven postcured at different conditions, and the heat resistance and mechanical properties were analyzed by TGA and tensile tests. The results revealed that the tensile strength of the bobbin increased by 122%, and the weight loss decreased by 0.79% at 350 °C after baking at 175 °C for 24 h. The optimal process parameters for producing bobbins to meet the criteria of nuclear installations were determined to be a molding temperature of 120 °C, molding pressure of 50 MPa, pressure holding time of 3 min, oven postcuring temperature of 175 °C, and postcuring time of 24 h. The molded products have passed the thermal aging performance test of nuclear power units.

show abstract

Enhancement in electrical and thermal performance of high‐temperature vulcanized silicone rubber composites for outdoor insulating applications

Cited by 12 publications

References 51 publications

Nano and micro co‐filled aluminum nitride/magnesium dihydrate—Silicone rubber composites for high voltage insulation

Nano and micro co‐filled aluminum nitride/magnesium dihydrate—Silicone rubber composites for high voltage insulation

Preparation of High-Strength and Excellent Compatibility Fluorine/Silicone Rubber Composites under the Synergistic Effect of Fillers

Research on Postcuring Parameters Effect on the Properties of Fiberglass-Reinforced Silicone Resin Coil Bobbin

Contact Info

Product

Resources

About