Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748285
Chen Can, Yifeng Lin, Zhidong Jia, Li Tong, L. Hai, Wang Xilin
In recent years, liquid silicone rubber (LSR) has been widely used in the external insulation field. However, further study on the degradation mechanism and the influencing factors of liquid silicone rubber is still required. Especially when it is used in southern parts of China, of which the high temperature and humidity environment could accelerate the degradation process. It is reported that cracking and chalking phenomena were observed on the liquid silicone rubber sheath of PT and CT. In this paper, a series of ageing experiments were designed and carried out to test the performance of liquid silicone rubber when exposed to factors such as high temperature, high humidity, sun exposure and corona discharge. After the experiments, characteristics such as hardness, hydrophobicity, glossiness and mechanical properties were tested and SEM was used to study the change of micro structure. It is concluded that high temperature, high humidity and sun exposure play significant roles in the degradation of liquid silicone rubber, which could lead to the rise of hardness, loss of hydrophobicity, decrease of glossiness and surface cracking. The results also show that the change of mechanical properties of liquid silicone rubber were tiny.
{"title":"Study on the influencing factors of natural degradation of liquid silicone rubber used for external insulation","authors":"Chen Can, Yifeng Lin, Zhidong Jia, Li Tong, L. Hai, Wang Xilin","doi":"10.1109/CEIDP.2013.6748285","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748285","url":null,"abstract":"In recent years, liquid silicone rubber (LSR) has been widely used in the external insulation field. However, further study on the degradation mechanism and the influencing factors of liquid silicone rubber is still required. Especially when it is used in southern parts of China, of which the high temperature and humidity environment could accelerate the degradation process. It is reported that cracking and chalking phenomena were observed on the liquid silicone rubber sheath of PT and CT. In this paper, a series of ageing experiments were designed and carried out to test the performance of liquid silicone rubber when exposed to factors such as high temperature, high humidity, sun exposure and corona discharge. After the experiments, characteristics such as hardness, hydrophobicity, glossiness and mechanical properties were tested and SEM was used to study the change of micro structure. It is concluded that high temperature, high humidity and sun exposure play significant roles in the degradation of liquid silicone rubber, which could lead to the rise of hardness, loss of hydrophobicity, decrease of glossiness and surface cracking. The results also show that the change of mechanical properties of liquid silicone rubber were tiny.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122265207","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748131
Xiaobo Meng, Jianfeng Hui, H. Mei, Liming Wang, Z. Guan
Corona problem is one of the important problems in the design and operation of the transmission lines. The corona discharge of high voltage transmission lines, results in power loss, radio interference and audible noise, which become more serious at the high altitudes. Besides, it has a great influence on the safe and robust operation of high voltage apparatus. A study carried out in the chamber made of perspex, was that AC corona characteristics varied with air pressure and humidity through the rod plane electrodes. The experiments showed that the inception voltage of AC corona was reduced with air pressure decreasing or humidity increasing. Meanwhile, the amplitude - phase distribution of AC corona pulse was displayed under different air pressure and humidity. Under low humidity (RH=25% or 55%), the streamer pulses only appear in the rise edge of positive half cycle, and the number of streamer pulses is few. The negative streamer pulses occur around the peak value of the negative half cycle. The streamer pulses appear in the rise and fall edge of positive half cycle at the same time with high humidity (RH=85%), and the number of streamer pulses increases obviously. When the humidity is higher (RH=95%), the streamer pulses appear only in the fall edge of positive half cycle. Furthermore, the negative streamer pulses around the peak of the negative half cycle also disappear.
{"title":"Influence of pressure and humidity on the amplitude — Phase distribution of AC corona pulse","authors":"Xiaobo Meng, Jianfeng Hui, H. Mei, Liming Wang, Z. Guan","doi":"10.1109/CEIDP.2013.6748131","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748131","url":null,"abstract":"Corona problem is one of the important problems in the design and operation of the transmission lines. The corona discharge of high voltage transmission lines, results in power loss, radio interference and audible noise, which become more serious at the high altitudes. Besides, it has a great influence on the safe and robust operation of high voltage apparatus. A study carried out in the chamber made of perspex, was that AC corona characteristics varied with air pressure and humidity through the rod plane electrodes. The experiments showed that the inception voltage of AC corona was reduced with air pressure decreasing or humidity increasing. Meanwhile, the amplitude - phase distribution of AC corona pulse was displayed under different air pressure and humidity. Under low humidity (RH=25% or 55%), the streamer pulses only appear in the rise edge of positive half cycle, and the number of streamer pulses is few. The negative streamer pulses occur around the peak value of the negative half cycle. The streamer pulses appear in the rise and fall edge of positive half cycle at the same time with high humidity (RH=85%), and the number of streamer pulses increases obviously. When the humidity is higher (RH=95%), the streamer pulses appear only in the fall edge of positive half cycle. Furthermore, the negative streamer pulses around the peak of the negative half cycle also disappear.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127153535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6747086
Yantao Li, Guangning Wu, Wei Li, Yunguang Cui, B. Gao
To research the influence mechanism of moisture and oxygen on the aging process of oil-paper insulation, accelerated thermal aging experiment which the mineral oil-paper samples with different moisture and oxygen contents were thermally aged under different temperature has been designed. The degree of polymerization (DP) and furfural in oil were measured during the aging process, and the influence of changes in the degree of polymerization on the second-order kinetics model parameters were verified under the condition of moisture and oxygen. Experimental results indicate that: the phenomenon of accelerated aging under the effect of moisture and temperature is obvious, there is an antagonistic effect between water and oxygen with low moisture content. Oxygen in oil will prevents the interaction of water and cellulose, and with the increase of the oxygen content it will become more and more obvious, thereby the rate of aging of the insulating paper will be reduced; Moisture and oxygen content and the type of insulation paper will affect furfural variation tendency during the aging process.
{"title":"Influence of moisture and oxygen on aging of oil-paper insulation","authors":"Yantao Li, Guangning Wu, Wei Li, Yunguang Cui, B. Gao","doi":"10.1109/CEIDP.2013.6747086","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747086","url":null,"abstract":"To research the influence mechanism of moisture and oxygen on the aging process of oil-paper insulation, accelerated thermal aging experiment which the mineral oil-paper samples with different moisture and oxygen contents were thermally aged under different temperature has been designed. The degree of polymerization (DP) and furfural in oil were measured during the aging process, and the influence of changes in the degree of polymerization on the second-order kinetics model parameters were verified under the condition of moisture and oxygen. Experimental results indicate that: the phenomenon of accelerated aging under the effect of moisture and temperature is obvious, there is an antagonistic effect between water and oxygen with low moisture content. Oxygen in oil will prevents the interaction of water and cellulose, and with the increase of the oxygen content it will become more and more obvious, thereby the rate of aging of the insulating paper will be reduced; Moisture and oxygen content and the type of insulation paper will affect furfural variation tendency during the aging process.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"112 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124119702","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748257
J. Yang, X. Wang, C. Zheng, H. Zhao, Q. Lei
In order to understand the change rule and its mechanism for the space charge property of Magnesium oxide (MgO)/ LDPE nanocomposites after damp, the moisture absorption weight and space charge properties of wet LDPE and MgO/LDPE were studied. Experiments results show that moisture absorption has a strong influence on dielectric properties of MgO/LDPE nanocomposite. After nanocomposite had been exposed for a week under the 40% relative humidity conditions, the improved space charge property of the composite at high electric field above 20kV/mm, were decreased obviously compare to dry MgO/LDPE. It is believed that moisture absorption may lead to a weakening of original interfacial charge distribution. On contrary, at low electric field, the MgO/LDPE system showed the strong suppression effect of aditional carriers migration caused by absorbed moisture.
{"title":"Influence of moisture absorption on space charge property of MgO/LDPE nanocomposite","authors":"J. Yang, X. Wang, C. Zheng, H. Zhao, Q. Lei","doi":"10.1109/CEIDP.2013.6748257","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748257","url":null,"abstract":"In order to understand the change rule and its mechanism for the space charge property of Magnesium oxide (MgO)/ LDPE nanocomposites after damp, the moisture absorption weight and space charge properties of wet LDPE and MgO/LDPE were studied. Experiments results show that moisture absorption has a strong influence on dielectric properties of MgO/LDPE nanocomposite. After nanocomposite had been exposed for a week under the 40% relative humidity conditions, the improved space charge property of the composite at high electric field above 20kV/mm, were decreased obviously compare to dry MgO/LDPE. It is believed that moisture absorption may lead to a weakening of original interfacial charge distribution. On contrary, at low electric field, the MgO/LDPE system showed the strong suppression effect of aditional carriers migration caused by absorbed moisture.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"215 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122361054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748272
Yu-fei Chen, Jialin Sun, T. Feng, Liping Wang, Zuoyu Wu
Epoxy resin (EP) and polyurethane (PU) were used as polymer matrix, chopped basalt fiber (BF) as reinforcement and prepared BF/EP-PU composites. And studied how different content of chopped BF influenced on the properties of BF/EP-PU composite. The results of SEM photos showed that the connection of BF and polymer matrix formed and chopped BF played a reinforcing role in BF/EP-PU composite. Mechanical properties of composites have attained to develop, shear strength reached 18.5MPa and breakdown field was 16.6kV/mm, when the chopped basalt fiber content was 3wt%.
{"title":"Study on properties of BF/EP-PU composite","authors":"Yu-fei Chen, Jialin Sun, T. Feng, Liping Wang, Zuoyu Wu","doi":"10.1109/CEIDP.2013.6748272","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748272","url":null,"abstract":"Epoxy resin (EP) and polyurethane (PU) were used as polymer matrix, chopped basalt fiber (BF) as reinforcement and prepared BF/EP-PU composites. And studied how different content of chopped BF influenced on the properties of BF/EP-PU composite. The results of SEM photos showed that the connection of BF and polymer matrix formed and chopped BF played a reinforcing role in BF/EP-PU composite. Mechanical properties of composites have attained to develop, shear strength reached 18.5MPa and breakdown field was 16.6kV/mm, when the chopped basalt fiber content was 3wt%.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116932027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748144
M. Salam, S. Ang, B. T. Ong, O. A. Malik, W. Voon, M. Alinurrezan
The presence of unwanted constituent on insulator surface of transmission tower plays an important ignition property for the likelihood of occurrence of flashover. In this paper, the pollution level of two aged insulators namely the longrod silicon rubber and the cap-and-pin glass insulators are measured. The results from the measurement shows that the Equivalent Salt Deposit Density (ESDD) of the cap-and-pin glass insulator, particularly near the pin is found to be 0.169 mg/cm2 while the composition over the cap surface is 0.136 mg/cm2. For the case of longrod silicon rubber insulator, the ESDD for both the pin and the cap are found to be 0.063 mg/cm2 and 0.016 mg/cm2 respectively. The outcomes from the ESDD measurements suggest that the cap-and-pin glass insulator string is severely contaminated with salt spray as compared to the longrod silicon rubber. Furthermore, a mathematical model of ESDD expressed in terms of salinity and temperature for both insulators is derived from multivariable regression method. The coefficients for both the cap-and-pin glass and longrod silicon rubber insulator are found to be 0.9984 and 0.9867 respectively.
{"title":"Measurement of pollution level of 66 kV transmission line insulators","authors":"M. Salam, S. Ang, B. T. Ong, O. A. Malik, W. Voon, M. Alinurrezan","doi":"10.1109/CEIDP.2013.6748144","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748144","url":null,"abstract":"The presence of unwanted constituent on insulator surface of transmission tower plays an important ignition property for the likelihood of occurrence of flashover. In this paper, the pollution level of two aged insulators namely the longrod silicon rubber and the cap-and-pin glass insulators are measured. The results from the measurement shows that the Equivalent Salt Deposit Density (ESDD) of the cap-and-pin glass insulator, particularly near the pin is found to be 0.169 mg/cm2 while the composition over the cap surface is 0.136 mg/cm2. For the case of longrod silicon rubber insulator, the ESDD for both the pin and the cap are found to be 0.063 mg/cm2 and 0.016 mg/cm2 respectively. The outcomes from the ESDD measurements suggest that the cap-and-pin glass insulator string is severely contaminated with salt spray as compared to the longrod silicon rubber. Furthermore, a mathematical model of ESDD expressed in terms of salinity and temperature for both insulators is derived from multivariable regression method. The coefficients for both the cap-and-pin glass and longrod silicon rubber insulator are found to be 0.9984 and 0.9867 respectively.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"1993 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131004833","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6747098
D. Taylor, H. Hiziroglu, P. H. Foss
It is clear that during the manufacturing of the windings of an electric motor, enamel-insulated copper conductors are subjected to mechanical strain. The electrical performance of the enamel insulation could be adversely affected by this mechanical strain. Partial discharge inception voltage (PDIV) is a useful tool for comparing the performance of insulations. Therefore, PDIV tests along with breakdown voltage tests were performed for evaluating the effect of different levels of tensile-strain on the electrical properties of the enamel insulation of the copper conductor. In a previous work the enamel insulation was tested between two parallel-plate electrodes. In this study, however, unstrained and tensile-strained, enamel-insulated, copper conductors with rectangular cross-section were investigated and compared for their breakdown voltages and partial discharge behavior in a carbon powder medium.
{"title":"Partial discharge and breakdown behavior of enamel-insulated copper conductors in carbon powder","authors":"D. Taylor, H. Hiziroglu, P. H. Foss","doi":"10.1109/CEIDP.2013.6747098","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747098","url":null,"abstract":"It is clear that during the manufacturing of the windings of an electric motor, enamel-insulated copper conductors are subjected to mechanical strain. The electrical performance of the enamel insulation could be adversely affected by this mechanical strain. Partial discharge inception voltage (PDIV) is a useful tool for comparing the performance of insulations. Therefore, PDIV tests along with breakdown voltage tests were performed for evaluating the effect of different levels of tensile-strain on the electrical properties of the enamel insulation of the copper conductor. In a previous work the enamel insulation was tested between two parallel-plate electrodes. In this study, however, unstrained and tensile-strained, enamel-insulated, copper conductors with rectangular cross-section were investigated and compared for their breakdown voltages and partial discharge behavior in a carbon powder medium.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"89 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132873228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6747096
F. Rogti, M. Ferhat
Space charge behavior at dielectric interfaces in multi-layer Fluorinated Ethylene Propylene (FEP) and Low Density Polyethylene (LDPE) subjected to a dc field has been investigated as a function of the temperature using the pulsed electro acoustic (PEA) technique. A sandwich structure constituted by two dielectric films not identical FEP/LDPE was used to study the charging propensity of electrode/dielectric and dielectric/ dielectric interface. The time dependence of the space charge distribution was subsequently recorded at different temperature under field (polarization) and short circuit condition (depolarization). Experimental results demonstrated that charge injected process take place in all cases. However it is shown that the amount of interfacial charge depends drastically on the temperature. It has greater influence on the distribution, injection and mobility of space charge in the bulk and at dielectric/ dielectric interfaces.
{"title":"Temperature effect on space charge dynamics in multi-layer insulation Fluorinated Ethylene Propylene (FEP) Low Density Polyethylene (LDPE)","authors":"F. Rogti, M. Ferhat","doi":"10.1109/CEIDP.2013.6747096","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6747096","url":null,"abstract":"Space charge behavior at dielectric interfaces in multi-layer Fluorinated Ethylene Propylene (FEP) and Low Density Polyethylene (LDPE) subjected to a dc field has been investigated as a function of the temperature using the pulsed electro acoustic (PEA) technique. A sandwich structure constituted by two dielectric films not identical FEP/LDPE was used to study the charging propensity of electrode/dielectric and dielectric/ dielectric interface. The time dependence of the space charge distribution was subsequently recorded at different temperature under field (polarization) and short circuit condition (depolarization). Experimental results demonstrated that charge injected process take place in all cases. However it is shown that the amount of interfacial charge depends drastically on the temperature. It has greater influence on the distribution, injection and mobility of space charge in the bulk and at dielectric/ dielectric interfaces.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134262908","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748306
Gang Ye, Hua Li, Fuchang Lin, Xiaogang Wu, Zeqi Huang, Qin Zhang, Jingwei Cai
As a key factor of insulation deterioration of XLPE cables, water tree can lead to the decrease of insulation property. But the dielectric loss caused by water tree is obvious at a very low frequency due to the long-time polarization of internal space charge. In this paper, focused on the dielectric response of cables, the dielectric loss spectrum of cable samples is also calculated by employing the extended Debye approach. Then the results are compared to measurements of dissipation factor (tan δ) at different frequencies by IDAX206, which shows that the aged cable has higher values of dielectric loss than a new one. The paper studies how the dielectric loss data can be effectively used to determine ageing state of the cables' insulation.
{"title":"Study on the dielectric response characteristic of XLPE cables","authors":"Gang Ye, Hua Li, Fuchang Lin, Xiaogang Wu, Zeqi Huang, Qin Zhang, Jingwei Cai","doi":"10.1109/CEIDP.2013.6748306","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748306","url":null,"abstract":"As a key factor of insulation deterioration of XLPE cables, water tree can lead to the decrease of insulation property. But the dielectric loss caused by water tree is obvious at a very low frequency due to the long-time polarization of internal space charge. In this paper, focused on the dielectric response of cables, the dielectric loss spectrum of cable samples is also calculated by employing the extended Debye approach. Then the results are compared to measurements of dissipation factor (tan δ) at different frequencies by IDAX206, which shows that the aged cable has higher values of dielectric loss than a new one. The paper studies how the dielectric loss data can be effectively used to determine ageing state of the cables' insulation.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134042162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2013-10-01DOI: 10.1109/CEIDP.2013.6748227
Jinqiang He, Hui Wang, Chunjiang Lin, Jiajun Lin, Shengtao Li
CaCu3Ti4O12 (CCTO) ceramics as a dielectric material are of potential applications in capacitors and memory devices, however, how to further improve the dielectric properties of CCTO ceramics is still a challenge. The dielectric behavior of this material can be manipulated via the modification in composition, and Si as a glass phase should have an impact on the properties of CCTO ceramics, this work investigated the effects of Si-doping on CaCu3Ti4O12 with the aim of improving dielectric characteristics. CaCu3Ti4O12 ceramics of various Si-doping concentrations were synthesized by solid state reaction method at 1050 C. The microstructure and the dielectric properties of Si-doped and undoped CaCu3Ti4O12 were studied. It is found that the added silicon can be incorporated into the structure of CaCu3Ti4O12, a certain amount of Si-doping would facilitate the grain growth, promote the precipitation of intergranular phase, and improve the compactness and homogeneity of CaCu3Ti4O12 ceramics. Si-doped CaCu3Ti4O12 samples show significantly higher dielectric constant, accompanied by larger dielectric loss. The temperature dependence of dielectric permittivity ε" for various frequencies shows three successive sets of peaks attributed to intrinsic relaxation polarization processes, suggesting that Si-doping has little influence on the relaxation mechanism of CaCu3Ti4O12 ceramics.
{"title":"The effects of Si-doping on the properties of CaCu3Ti4O12 ceramics","authors":"Jinqiang He, Hui Wang, Chunjiang Lin, Jiajun Lin, Shengtao Li","doi":"10.1109/CEIDP.2013.6748227","DOIUrl":"https://doi.org/10.1109/CEIDP.2013.6748227","url":null,"abstract":"CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> (CCTO) ceramics as a dielectric material are of potential applications in capacitors and memory devices, however, how to further improve the dielectric properties of CCTO ceramics is still a challenge. The dielectric behavior of this material can be manipulated via the modification in composition, and Si as a glass phase should have an impact on the properties of CCTO ceramics, this work investigated the effects of Si-doping on CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> with the aim of improving dielectric characteristics. CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> ceramics of various Si-doping concentrations were synthesized by solid state reaction method at 1050 C. The microstructure and the dielectric properties of Si-doped and undoped CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> were studied. It is found that the added silicon can be incorporated into the structure of CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub>, a certain amount of Si-doping would facilitate the grain growth, promote the precipitation of intergranular phase, and improve the compactness and homogeneity of CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> ceramics. Si-doped CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> samples show significantly higher dielectric constant, accompanied by larger dielectric loss. The temperature dependence of dielectric permittivity ε\" for various frequencies shows three successive sets of peaks attributed to intrinsic relaxation polarization processes, suggesting that Si-doping has little influence on the relaxation mechanism of CaCu<sub>3</sub>Ti<sub>4</sub>O<sub>12</sub> ceramics.","PeriodicalId":393969,"journal":{"name":"2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134543273","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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