Understanding the electrical, thermal, and mechanical properties of epoxy magnesium oxide nanocomposites

Epoxy MgO nanocomposites exhibit high surface discharge inception voltage (SDIV) in SF6 gas ambience. Increase in SDIV is observed with 3wt% of MgO-added epoxy nanocomposites, especially when the SF6 ambient gas pressure is high. Impact of thermal ageing of epoxy nanocomposites on SDIV is minimum. Dielectric response studies were carried out experimentally and compared with modelling studies. The surface potential decay and charge trap characteristics of epoxy nanocomposites vary with percentage of nano filler. Thermal aging of epoxy nanocomposites has less influence on surface potential decay characteristics for 1 and 3 wt% MgO-added epoxy nanocomposites, indicating anti-thermal aging characteristics. Surface discharge activity generates UHF with its dominant frequency at around 1 GHz. The UHF signal magnitude formed due to SD activity is minimum with 3 wt% MgO-added epoxy nanocomposites. Laser-induced breakdown spectroscopy (LIBS) studies indicate that plasma temperature and threshold fluence increases with increase in wt% of MgO in epoxy resin. Tensile and flexural properties are greatly improved for nanocomposite compared to epoxy. The dynamic mechanical analysis (DMA) indicates increased storage modulus and reduction of tan δ with epoxy nanocomposites. The glass transition temperature (Tg) and activation energy increases with wt % of nano filler.

[1]  R. Sarathi,et al.  Understanding the physico‐chemical and surface discharge properties of epoxy silicon carbide nanocomposites , 2018 .

[2]  B. X. Du,et al.  Temperature dependent surface potential decay and flashover characteristics of epoxy/SiC composites , 2018, IEEE Transactions on Dielectrics and Electrical Insulation.

[3]  B. Du,et al.  Carrier mobility and trap distribution dependent flashover characteristics of epoxy resin , 2018 .

[4]  Guo-ming Ma,et al.  Impact of temperature on surface charges accumulation on insulators in SF6-filled DC-GIL , 2017, IEEE Transactions on Dielectrics and Electrical Insulation.

[5]  Yu Zheng,et al.  Detection of intense partial discharge of epoxy insulation in sf6 insulated equipment using carbonyl sulfide , 2016, IEEE Transactions on Dielectrics and Electrical Insulation.

[6]  Meng Xiao,et al.  Review of high thermal conductivity polymer dielectrics for electrical insulation , 2016 .

[7]  Shudi Zhang,et al.  Laser-induced plasma temperature , 2014 .

[8]  D. Yan,et al.  The effect of graphene dispersion on the mechanical properties of graphene/epoxy composites , 2013 .

[9]  B. Du,et al.  Effects of TiO2 particles on surface charge of epoxy nanocomposites , 2012, IEEE Transactions on Dielectrics and Electrical Insulation.

[10]  Klaus Friedrich,et al.  Epoxy nanocomposites ¿ fracture and toughening mechanisms , 2006 .

[11]  R. Sarathi,et al.  Understanding the Performance of Epoxy Nano Composites — A Physico-Chemical Approach , 2006 .

[12]  J. K. Nelson,et al.  Nanocomposite dielectrics—properties and implications , 2005 .

[13]  S. Goyanes,et al.  Dynamic mechanical analysis of particulate‐filled epoxy resin , 2003 .

[14]  Ari Henrik Sihvola,et al.  Effective permittivity of mixtures: numerical validation by the FDTD method , 2000, IEEE Trans. Geosci. Remote. Sens..

[15]  M. Maeda,et al.  UV-Laser Ablation Spectroscopy in Element Analysis of Solid Surface , 1998 .

[16]  Martin D. Judd,et al.  A pulsed GTEM system for UHF sensor calibration , 1998, IEEE Trans. Instrum. Meas..

[17]  K. Srivastava,et al.  Surface charging and flashover of spacers in SF/sub 6/ under impulse voltages , 1991 .

[18]  D. Mickish.  Effects of interfacial polarization and loading factor in dielectric‐loss measurements of composites , 1979 .