The Experts below are selected from a list of 191352 Experts worldwide ranked by ideXlab platform
Yasuo Suzuoki - One of the best experts on this subject based on the ideXlab platform.
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Relative Permittivity of TiO 2 /Silicone Elastomer Composite Stretched in Uniaxial Direction
2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2018Co-Authors: K. Naya, Muneaki Kurimoto, T. Kato, Yasuo SuzuokiAbstract:A dielectric elastomer is used for conversion of electrical and mechanical energy. The output energy of dielectric elastomer depends on the relative Permittivity of the elastomer sheet. The relative Permittivity of the elastomer can be increased by filling the elastomer with high Permittivity particles. In this paper, the relative Permittivity of TiO 2 /silicone elastomer composites was measured in the uniaxial stretching experiment assuming the state of use of dielectric elastomer. The relative Permittivity of TiO 2 /silicone elastomer composite was higher than that of unfilled silicone elastomer and also increased with the increase in the volume fraction of TiO 2 particles. The uniaxial stretching reduced the relative Permittivity of the composite. The decreasing ratio of the stretched composites was larger than that of the stretched silicone.
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Influence of Elastomer Material and Stretch Direction on Relative Permittivity of Stretched Dielectric Elastomer
2018 IEEE 2nd International Conference on Dielectrics (ICD), 2018Co-Authors: Muneaki Kurimoto, K. Naya, Takeyoshi Kato, Yasuo SuzuokiAbstract:A dielectric elastomer (DE), which is an elastomer sheet sandwiched between two compliant electrodes, is used for conversion of electrical energy into mechanical energy and vice versa. The energy output of DE depends on the relative Permittivity of the elastomer sheet. When DE is stretched, the geometric capacitance increases but the relative Permittivity may change. It is because the density of the elastomer sheets is decreased and/or the orientation polarization of the elastomer molecules is restricted. The change in the Permittivity of stretched DE prevents the accurate evaluation of the output of the DE. In this paper, to evaluate relative Permittivity of the stretched DE, we built the electrode system measuring the capacitance. As a result, we clarified that the elastomer material and the stretch direction affected relative Permittivity of the elastomer.
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filling ratio control of tio2 and sio2 in epoxy composites for Permittivity graded insulator with low coefficient of thermal expansion
IEEE Transactions on Dielectrics and Electrical Insulation, 2018Co-Authors: Muneaki Kurimoto, Hiroya Ozaki, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:The feasibility of a Permittivity-graded epoxy insulator with a low coefficient of thermal expansion (CTE) was clarified by evaluating the dielectric and thermomechanical properties of TiO2/SiO2 epoxy composites, which were epoxy composites co-filled with TiO2 and SiO2 particles. Upon varying the filling ratio of TiO2 to SiO2 while keeping the total filler volume constant, the relative Permittivity of the TiO2/SiO2 epoxy composites varied in the range of 3.5–7.5 in our experiment while the CTE remained similar to that of an aluminum conductor used in gas-insulated power apparatus. The range of the relative Permittivity of the TiO2/SiO2 epoxy composites with a low CTE satisfied the condition for realizing a Permittivity-graded epoxy insulator. The application of an appropriate gradient of the Permittivity distribution to a Permittivity-graded epoxy insulator with a low CTE resulted in the relaxation of the electric field on the surface of an insulator.
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Permittivity Calculation Model for Low Permittivity Characteristic of Epoxy/Hollow Silica Nanocomposites
2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2018Co-Authors: M. Kurimoto, T. Kato, T. Yoshida, C. Kato, Yasuo SuzuokiAbstract:To achieve a low Permittivity solid insulator for HV power apparatus, we have developed an epoxy composite filled with hollow silica nanoparticles (epoxy/hollow silica nanocomposite). It has become clear that the relative Permittivity of epoxy/hollow silica nanocomposite is lower than that of unfilled epoxy. In this paper, a Permittivity calculation model of epoxy/hollow silica nanocomposite was constructed using the finite element method (FEM). The relative Permittivity by the model calculation corresponds with the result of the capacity measurement on the actual epoxy/hollow silica nanocomposite. Therefore, it is confirmed that the low Permittivity characteristic of epoxy/hollow silica nanocomposites is due to the hollow structure of nanoparticles.
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particle porosity and relative Permittivity of epoxy hollow silica nanocomposites
Conference on Electrical Insulation and Dielectric Phenomena, 2017Co-Authors: T. Yoshida, Muneaki Kurimoto, Toshihisa Funabashi, Takeyoshi Kato, Yusuke Manabe, Yasuo SuzuokiAbstract:In this paper, we investigated the relation between particle porosity and relative Permittivity of epoxy/hollow silica nanocomposites. The hollow silica nanoparticle comprised a silica nanoparticle containing a nanometric pore. If an air pore inside the hollow silica nanoparticle remain unfilled with epoxy resin, the hollow silica nanoparticle can be used as a lower-Permittivity filler for epoxy composite. It was confirmed that particle porosity of epoxy/hollow silica nanocomposites was about 70 vol% experimentally. Relative Permittivity of epoxy/hollow silica nanocomposites was lower than that of unfilled epoxy resin. To verify the measurement results of the Permittivity, the Permittivity calculation model of epoxy/hollow silica nanocomposites was constructed with using a finite element method (FEM). The hollow silica nanoparticles were simply modeled as spherical hollow nanoparticles. Finally, we discussed whether the pore of the hollow silica nanoparticles affected the low Permittivity of epoxy/hollow silica nanocomposites.
Muneaki Kurimoto - One of the best experts on this subject based on the ideXlab platform.
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Relative Permittivity of TiO 2 /Silicone Elastomer Composite Stretched in Uniaxial Direction
2018 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), 2018Co-Authors: K. Naya, Muneaki Kurimoto, T. Kato, Yasuo SuzuokiAbstract:A dielectric elastomer is used for conversion of electrical and mechanical energy. The output energy of dielectric elastomer depends on the relative Permittivity of the elastomer sheet. The relative Permittivity of the elastomer can be increased by filling the elastomer with high Permittivity particles. In this paper, the relative Permittivity of TiO 2 /silicone elastomer composites was measured in the uniaxial stretching experiment assuming the state of use of dielectric elastomer. The relative Permittivity of TiO 2 /silicone elastomer composite was higher than that of unfilled silicone elastomer and also increased with the increase in the volume fraction of TiO 2 particles. The uniaxial stretching reduced the relative Permittivity of the composite. The decreasing ratio of the stretched composites was larger than that of the stretched silicone.
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Influence of Elastomer Material and Stretch Direction on Relative Permittivity of Stretched Dielectric Elastomer
2018 IEEE 2nd International Conference on Dielectrics (ICD), 2018Co-Authors: Muneaki Kurimoto, K. Naya, Takeyoshi Kato, Yasuo SuzuokiAbstract:A dielectric elastomer (DE), which is an elastomer sheet sandwiched between two compliant electrodes, is used for conversion of electrical energy into mechanical energy and vice versa. The energy output of DE depends on the relative Permittivity of the elastomer sheet. When DE is stretched, the geometric capacitance increases but the relative Permittivity may change. It is because the density of the elastomer sheets is decreased and/or the orientation polarization of the elastomer molecules is restricted. The change in the Permittivity of stretched DE prevents the accurate evaluation of the output of the DE. In this paper, to evaluate relative Permittivity of the stretched DE, we built the electrode system measuring the capacitance. As a result, we clarified that the elastomer material and the stretch direction affected relative Permittivity of the elastomer.
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filling ratio control of tio2 and sio2 in epoxy composites for Permittivity graded insulator with low coefficient of thermal expansion
IEEE Transactions on Dielectrics and Electrical Insulation, 2018Co-Authors: Muneaki Kurimoto, Hiroya Ozaki, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:The feasibility of a Permittivity-graded epoxy insulator with a low coefficient of thermal expansion (CTE) was clarified by evaluating the dielectric and thermomechanical properties of TiO2/SiO2 epoxy composites, which were epoxy composites co-filled with TiO2 and SiO2 particles. Upon varying the filling ratio of TiO2 to SiO2 while keeping the total filler volume constant, the relative Permittivity of the TiO2/SiO2 epoxy composites varied in the range of 3.5–7.5 in our experiment while the CTE remained similar to that of an aluminum conductor used in gas-insulated power apparatus. The range of the relative Permittivity of the TiO2/SiO2 epoxy composites with a low CTE satisfied the condition for realizing a Permittivity-graded epoxy insulator. The application of an appropriate gradient of the Permittivity distribution to a Permittivity-graded epoxy insulator with a low CTE resulted in the relaxation of the electric field on the surface of an insulator.
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particle porosity and relative Permittivity of epoxy hollow silica nanocomposites
Conference on Electrical Insulation and Dielectric Phenomena, 2017Co-Authors: T. Yoshida, Muneaki Kurimoto, Toshihisa Funabashi, Takeyoshi Kato, Yusuke Manabe, Yasuo SuzuokiAbstract:In this paper, we investigated the relation between particle porosity and relative Permittivity of epoxy/hollow silica nanocomposites. The hollow silica nanoparticle comprised a silica nanoparticle containing a nanometric pore. If an air pore inside the hollow silica nanoparticle remain unfilled with epoxy resin, the hollow silica nanoparticle can be used as a lower-Permittivity filler for epoxy composite. It was confirmed that particle porosity of epoxy/hollow silica nanocomposites was about 70 vol% experimentally. Relative Permittivity of epoxy/hollow silica nanocomposites was lower than that of unfilled epoxy resin. To verify the measurement results of the Permittivity, the Permittivity calculation model of epoxy/hollow silica nanocomposites was constructed with using a finite element method (FEM). The hollow silica nanoparticles were simply modeled as spherical hollow nanoparticles. Finally, we discussed whether the pore of the hollow silica nanoparticles affected the low Permittivity of epoxy/hollow silica nanocomposites.
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Evaluation of relative Permittivity and coefficient of thermal expansion of TiO 2 /SiO 2 epoxy composites for Permittivity-graded insulator
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP), 2017Co-Authors: Hiroya Ozaki, Muneaki Kurimoto, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:We have been investigating the feasibility of Permittivity graded material whose coefficient of thermal expansion (CTE) was low. We have already reported that relative Permittivity of TiO 2 /SiO 2 epoxy composites was able to be changed in 3.5–7.5 with keeping CTE low in 23–29 ppm/K by changing the filling ratio of TiO 2 and SiO 2 in keeping the total volume fraction at 50 vol%. In this paper, we evaluated relative Permittivity and CTE of the TiO 2 /SiO 2 epoxy composites with using conventional calculation models. The tendency of relative Permittivity of the TiO 2 /SiO 2 epoxy composites was roughly explained by Lichitenecker & Rother equation. CTE of the TiO 2 /SiO 2 epoxy composites was in the range between upper and lower limit of a calculation model based on Schapery equation. Furthermore, the range from 3.5 to 7.5 in relative Permittivity of the TiO 2 /SiO 2 epoxy composites with low CTE was met the condition necessary for realizing Permittivity graded material. The electric field relaxation effect of the Permittivity graded material was estimated.
Takeyoshi Kato - One of the best experts on this subject based on the ideXlab platform.
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Influence of Elastomer Material and Stretch Direction on Relative Permittivity of Stretched Dielectric Elastomer
2018 IEEE 2nd International Conference on Dielectrics (ICD), 2018Co-Authors: Muneaki Kurimoto, K. Naya, Takeyoshi Kato, Yasuo SuzuokiAbstract:A dielectric elastomer (DE), which is an elastomer sheet sandwiched between two compliant electrodes, is used for conversion of electrical energy into mechanical energy and vice versa. The energy output of DE depends on the relative Permittivity of the elastomer sheet. When DE is stretched, the geometric capacitance increases but the relative Permittivity may change. It is because the density of the elastomer sheets is decreased and/or the orientation polarization of the elastomer molecules is restricted. The change in the Permittivity of stretched DE prevents the accurate evaluation of the output of the DE. In this paper, to evaluate relative Permittivity of the stretched DE, we built the electrode system measuring the capacitance. As a result, we clarified that the elastomer material and the stretch direction affected relative Permittivity of the elastomer.
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filling ratio control of tio2 and sio2 in epoxy composites for Permittivity graded insulator with low coefficient of thermal expansion
IEEE Transactions on Dielectrics and Electrical Insulation, 2018Co-Authors: Muneaki Kurimoto, Hiroya Ozaki, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:The feasibility of a Permittivity-graded epoxy insulator with a low coefficient of thermal expansion (CTE) was clarified by evaluating the dielectric and thermomechanical properties of TiO2/SiO2 epoxy composites, which were epoxy composites co-filled with TiO2 and SiO2 particles. Upon varying the filling ratio of TiO2 to SiO2 while keeping the total filler volume constant, the relative Permittivity of the TiO2/SiO2 epoxy composites varied in the range of 3.5–7.5 in our experiment while the CTE remained similar to that of an aluminum conductor used in gas-insulated power apparatus. The range of the relative Permittivity of the TiO2/SiO2 epoxy composites with a low CTE satisfied the condition for realizing a Permittivity-graded epoxy insulator. The application of an appropriate gradient of the Permittivity distribution to a Permittivity-graded epoxy insulator with a low CTE resulted in the relaxation of the electric field on the surface of an insulator.
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particle porosity and relative Permittivity of epoxy hollow silica nanocomposites
Conference on Electrical Insulation and Dielectric Phenomena, 2017Co-Authors: T. Yoshida, Muneaki Kurimoto, Toshihisa Funabashi, Takeyoshi Kato, Yusuke Manabe, Yasuo SuzuokiAbstract:In this paper, we investigated the relation between particle porosity and relative Permittivity of epoxy/hollow silica nanocomposites. The hollow silica nanoparticle comprised a silica nanoparticle containing a nanometric pore. If an air pore inside the hollow silica nanoparticle remain unfilled with epoxy resin, the hollow silica nanoparticle can be used as a lower-Permittivity filler for epoxy composite. It was confirmed that particle porosity of epoxy/hollow silica nanocomposites was about 70 vol% experimentally. Relative Permittivity of epoxy/hollow silica nanocomposites was lower than that of unfilled epoxy resin. To verify the measurement results of the Permittivity, the Permittivity calculation model of epoxy/hollow silica nanocomposites was constructed with using a finite element method (FEM). The hollow silica nanoparticles were simply modeled as spherical hollow nanoparticles. Finally, we discussed whether the pore of the hollow silica nanoparticles affected the low Permittivity of epoxy/hollow silica nanocomposites.
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Evaluation of relative Permittivity and coefficient of thermal expansion of TiO 2 /SiO 2 epoxy composites for Permittivity-graded insulator
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP), 2017Co-Authors: Hiroya Ozaki, Muneaki Kurimoto, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:We have been investigating the feasibility of Permittivity graded material whose coefficient of thermal expansion (CTE) was low. We have already reported that relative Permittivity of TiO 2 /SiO 2 epoxy composites was able to be changed in 3.5–7.5 with keeping CTE low in 23–29 ppm/K by changing the filling ratio of TiO 2 and SiO 2 in keeping the total volume fraction at 50 vol%. In this paper, we evaluated relative Permittivity and CTE of the TiO 2 /SiO 2 epoxy composites with using conventional calculation models. The tendency of relative Permittivity of the TiO 2 /SiO 2 epoxy composites was roughly explained by Lichitenecker & Rother equation. CTE of the TiO 2 /SiO 2 epoxy composites was in the range between upper and lower limit of a calculation model based on Schapery equation. Furthermore, the range from 3.5 to 7.5 in relative Permittivity of the TiO 2 /SiO 2 epoxy composites with low CTE was met the condition necessary for realizing Permittivity graded material. The electric field relaxation effect of the Permittivity graded material was estimated.
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Evaluation of coefficient of thermal expansion and relative Permittivity of TiO 2 /SiO 2 epoxy composite
2017 International Symposium on Electrical Insulating Materials (ISEIM), 2017Co-Authors: Hiroya Ozaki, Muneaki Kurimoto, Toshihisa Funabashi, Takeyoshi Kato, Toru Sawada, Yasuo SuzuokiAbstract:To obtain Permittivity graded material whose coefficient of thermal expansion (CTE) was low, this paper investigated the feasibility of changing Permittivity of epoxy composites with keeping CTE low. The epoxy composites cofilled with TiO 2 particles and SiO 2 particles (TiO 2 /SiO 2 epoxy composites) were fabricated. To change Permittivity of epoxy composites with keeping CTE low, the filling ratio of TiO 2 and SiO 2 was changed from 0:50 to 20:30 in keeping the total volume fraction at 50 vol%. The CTE and relative Permittivity of TiO 2 /SiO 2 epoxy composites were compared with those of TiO 2 epoxy composites. It was confirmed that the CTE of TiO 2 /SiO 2 epoxy composites was lower than that of TiO 2 epoxy composites. With increasing TiO 2 volume fraction in keeping the total volume fraction at 50 vol%, the relative Permittivity of TiO 2 /SiO 2 epoxy composites was increased from 3.5 to 7.5. These results indicated the possibility of obtaining the Permittivity graded material with keeping CTE low.
Hiroya Ozaki - One of the best experts on this subject based on the ideXlab platform.
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filling ratio control of tio2 and sio2 in epoxy composites for Permittivity graded insulator with low coefficient of thermal expansion
IEEE Transactions on Dielectrics and Electrical Insulation, 2018Co-Authors: Muneaki Kurimoto, Hiroya Ozaki, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:The feasibility of a Permittivity-graded epoxy insulator with a low coefficient of thermal expansion (CTE) was clarified by evaluating the dielectric and thermomechanical properties of TiO2/SiO2 epoxy composites, which were epoxy composites co-filled with TiO2 and SiO2 particles. Upon varying the filling ratio of TiO2 to SiO2 while keeping the total filler volume constant, the relative Permittivity of the TiO2/SiO2 epoxy composites varied in the range of 3.5–7.5 in our experiment while the CTE remained similar to that of an aluminum conductor used in gas-insulated power apparatus. The range of the relative Permittivity of the TiO2/SiO2 epoxy composites with a low CTE satisfied the condition for realizing a Permittivity-graded epoxy insulator. The application of an appropriate gradient of the Permittivity distribution to a Permittivity-graded epoxy insulator with a low CTE resulted in the relaxation of the electric field on the surface of an insulator.
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Evaluation of relative Permittivity and coefficient of thermal expansion of TiO 2 /SiO 2 epoxy composites for Permittivity-graded insulator
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP), 2017Co-Authors: Hiroya Ozaki, Muneaki Kurimoto, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:We have been investigating the feasibility of Permittivity graded material whose coefficient of thermal expansion (CTE) was low. We have already reported that relative Permittivity of TiO 2 /SiO 2 epoxy composites was able to be changed in 3.5–7.5 with keeping CTE low in 23–29 ppm/K by changing the filling ratio of TiO 2 and SiO 2 in keeping the total volume fraction at 50 vol%. In this paper, we evaluated relative Permittivity and CTE of the TiO 2 /SiO 2 epoxy composites with using conventional calculation models. The tendency of relative Permittivity of the TiO 2 /SiO 2 epoxy composites was roughly explained by Lichitenecker & Rother equation. CTE of the TiO 2 /SiO 2 epoxy composites was in the range between upper and lower limit of a calculation model based on Schapery equation. Furthermore, the range from 3.5 to 7.5 in relative Permittivity of the TiO 2 /SiO 2 epoxy composites with low CTE was met the condition necessary for realizing Permittivity graded material. The electric field relaxation effect of the Permittivity graded material was estimated.
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Evaluation of coefficient of thermal expansion and relative Permittivity of TiO 2 /SiO 2 epoxy composite
2017 International Symposium on Electrical Insulating Materials (ISEIM), 2017Co-Authors: Hiroya Ozaki, Muneaki Kurimoto, Toshihisa Funabashi, Takeyoshi Kato, Toru Sawada, Yasuo SuzuokiAbstract:To obtain Permittivity graded material whose coefficient of thermal expansion (CTE) was low, this paper investigated the feasibility of changing Permittivity of epoxy composites with keeping CTE low. The epoxy composites cofilled with TiO 2 particles and SiO 2 particles (TiO 2 /SiO 2 epoxy composites) were fabricated. To change Permittivity of epoxy composites with keeping CTE low, the filling ratio of TiO 2 and SiO 2 was changed from 0:50 to 20:30 in keeping the total volume fraction at 50 vol%. The CTE and relative Permittivity of TiO 2 /SiO 2 epoxy composites were compared with those of TiO 2 epoxy composites. It was confirmed that the CTE of TiO 2 /SiO 2 epoxy composites was lower than that of TiO 2 epoxy composites. With increasing TiO 2 volume fraction in keeping the total volume fraction at 50 vol%, the relative Permittivity of TiO 2 /SiO 2 epoxy composites was increased from 3.5 to 7.5. These results indicated the possibility of obtaining the Permittivity graded material with keeping CTE low.
Toshihisa Funabashi - One of the best experts on this subject based on the ideXlab platform.
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filling ratio control of tio2 and sio2 in epoxy composites for Permittivity graded insulator with low coefficient of thermal expansion
IEEE Transactions on Dielectrics and Electrical Insulation, 2018Co-Authors: Muneaki Kurimoto, Hiroya Ozaki, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:The feasibility of a Permittivity-graded epoxy insulator with a low coefficient of thermal expansion (CTE) was clarified by evaluating the dielectric and thermomechanical properties of TiO2/SiO2 epoxy composites, which were epoxy composites co-filled with TiO2 and SiO2 particles. Upon varying the filling ratio of TiO2 to SiO2 while keeping the total filler volume constant, the relative Permittivity of the TiO2/SiO2 epoxy composites varied in the range of 3.5–7.5 in our experiment while the CTE remained similar to that of an aluminum conductor used in gas-insulated power apparatus. The range of the relative Permittivity of the TiO2/SiO2 epoxy composites with a low CTE satisfied the condition for realizing a Permittivity-graded epoxy insulator. The application of an appropriate gradient of the Permittivity distribution to a Permittivity-graded epoxy insulator with a low CTE resulted in the relaxation of the electric field on the surface of an insulator.
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particle porosity and relative Permittivity of epoxy hollow silica nanocomposites
Conference on Electrical Insulation and Dielectric Phenomena, 2017Co-Authors: T. Yoshida, Muneaki Kurimoto, Toshihisa Funabashi, Takeyoshi Kato, Yusuke Manabe, Yasuo SuzuokiAbstract:In this paper, we investigated the relation between particle porosity and relative Permittivity of epoxy/hollow silica nanocomposites. The hollow silica nanoparticle comprised a silica nanoparticle containing a nanometric pore. If an air pore inside the hollow silica nanoparticle remain unfilled with epoxy resin, the hollow silica nanoparticle can be used as a lower-Permittivity filler for epoxy composite. It was confirmed that particle porosity of epoxy/hollow silica nanocomposites was about 70 vol% experimentally. Relative Permittivity of epoxy/hollow silica nanocomposites was lower than that of unfilled epoxy resin. To verify the measurement results of the Permittivity, the Permittivity calculation model of epoxy/hollow silica nanocomposites was constructed with using a finite element method (FEM). The hollow silica nanoparticles were simply modeled as spherical hollow nanoparticles. Finally, we discussed whether the pore of the hollow silica nanoparticles affected the low Permittivity of epoxy/hollow silica nanocomposites.
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Evaluation of relative Permittivity and coefficient of thermal expansion of TiO 2 /SiO 2 epoxy composites for Permittivity-graded insulator
2017 IEEE Conference on Electrical Insulation and Dielectric Phenomenon (CEIDP), 2017Co-Authors: Hiroya Ozaki, Muneaki Kurimoto, Tooru Sawada, Toshihisa Funabashi, Takeyoshi Kato, Yasuo SuzuokiAbstract:We have been investigating the feasibility of Permittivity graded material whose coefficient of thermal expansion (CTE) was low. We have already reported that relative Permittivity of TiO 2 /SiO 2 epoxy composites was able to be changed in 3.5–7.5 with keeping CTE low in 23–29 ppm/K by changing the filling ratio of TiO 2 and SiO 2 in keeping the total volume fraction at 50 vol%. In this paper, we evaluated relative Permittivity and CTE of the TiO 2 /SiO 2 epoxy composites with using conventional calculation models. The tendency of relative Permittivity of the TiO 2 /SiO 2 epoxy composites was roughly explained by Lichitenecker & Rother equation. CTE of the TiO 2 /SiO 2 epoxy composites was in the range between upper and lower limit of a calculation model based on Schapery equation. Furthermore, the range from 3.5 to 7.5 in relative Permittivity of the TiO 2 /SiO 2 epoxy composites with low CTE was met the condition necessary for realizing Permittivity graded material. The electric field relaxation effect of the Permittivity graded material was estimated.
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Evaluation of coefficient of thermal expansion and relative Permittivity of TiO 2 /SiO 2 epoxy composite
2017 International Symposium on Electrical Insulating Materials (ISEIM), 2017Co-Authors: Hiroya Ozaki, Muneaki Kurimoto, Toshihisa Funabashi, Takeyoshi Kato, Toru Sawada, Yasuo SuzuokiAbstract:To obtain Permittivity graded material whose coefficient of thermal expansion (CTE) was low, this paper investigated the feasibility of changing Permittivity of epoxy composites with keeping CTE low. The epoxy composites cofilled with TiO 2 particles and SiO 2 particles (TiO 2 /SiO 2 epoxy composites) were fabricated. To change Permittivity of epoxy composites with keeping CTE low, the filling ratio of TiO 2 and SiO 2 was changed from 0:50 to 20:30 in keeping the total volume fraction at 50 vol%. The CTE and relative Permittivity of TiO 2 /SiO 2 epoxy composites were compared with those of TiO 2 epoxy composites. It was confirmed that the CTE of TiO 2 /SiO 2 epoxy composites was lower than that of TiO 2 epoxy composites. With increasing TiO 2 volume fraction in keeping the total volume fraction at 50 vol%, the relative Permittivity of TiO 2 /SiO 2 epoxy composites was increased from 3.5 to 7.5. These results indicated the possibility of obtaining the Permittivity graded material with keeping CTE low.
