Far East Holding Group Co.

Yicheng, China

Far East Holding Group Co.

Yicheng, China
SEARCH FILTERS
Time filter
Source Type

Zhou Z.,Shanghai University | Bai R.,Shanghai University | Ren M.,Shanghai University | Sun J.,Shanghai University | And 3 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2011

The curing reaction of multifunctional epoxy resin system was studied by using non-isothermal DSC (differential scanning calorimetry), methyl nadic anhydride (MNA) as curing agent was determined. And then the curing reactivity for a system of AG-70/MNA/2-ethyl-4-methylimidazole (EMI-2, 4) was measured at different heating rates. According to the DSC curves, the curing parameters were obtained by using T-β curve extrapolation, the temperature parameters could supply a guidance to the proper curing process. The kinetic parameters of the curing reaction of AG-70 epoxy resin system were calculated by using Kissinger and Crane equation, the kinetic model based on the nth order reaction equation was set up. Finally the curves of degree of cure a vs. temperature and time, rate of reaction dα/dt vs. temperature and time were analyzed respectively, it shows that the calculated data is in good agreement with that theoretically.


Zhou Z.,Shanghai University | Bai R.,Shanghai University | Ren M.,Shanghai University | Sun J.,Shanghai University | And 3 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2011

The curing reaction and rheological behavior of AG-70 epoxy resin system were measured using non-isothermal differential scanning calorimetry (DSC) and non-isothermal and isothermal RS600 Rotational Rheometer, respectively. From the experimental data, it is found that the cure kinetic equation of epoxy resin is correspond with two-parameter autocatalytic model. The kinetic parameters in model were calculated using the most probability method supported by Malek, and the kinetic equations were obtained from two characteristic values, then comparison between the experimental data and calculated ones was done. Gelation temperature point was determined by two different methods, the point was compared with the other one obtained from differential scanning calorimetry (DSC) measurement, gelation model was set up using the relationship between isothermal temperature and gelation time, and the mathematical description is ln tgel=-19.67+8.57/T.


Zeng T.T.,Shanghai University | Chen L.,Shanghai University | Li D.P.,Shanghai University | Sun J.L.,Shanghai University | And 2 more authors.
Advanced Materials Research | Year: 2014

The Org-rectorite, which was used as a filler in the Rectorite/Epoxy nanocomposites, was prepared by the intercalation and exfoliation of rectorite with dodecyl-bis(2-hydroxyethyl)-methylazanium chloride as the organic cation exchange agent. The two curing agents methyl hexahydrophthalic anhydride (MHHPA) and m-phenylenediamine were employed at working temperature ranging from 70 °C to 190 °C. The samples were characterized by Fourier Transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and differential scanning calorimeter (DSC) analysis. The results show that the d001 (55.9 Å) of Rectorite/Epoxy composites cured with MHHPA at 70 °C was larger than the Org-rectorite (28.7 Å), and the Org-rectorite was exfoliated at 90 °C working temperature. While the d001 of Rectorite/Epoxy composites cured with m-phenylenediamine at 70 °C and 90 °C were 40.9 Å and 42.1 Å, and were exfoliated at 140 °C. The apparent activation energy (Ea) of Rectorite/Epoxy composites cured with MHHPA and m-phenylenediamine were obtained to be 74.85 and 59.15 KJ/mol, respectively. The higher apparent activation energy (Ea) of MHHPA systems may be responsible for the lower exfoliation temperature. © (2014) Trans Tech Publications, Switzerland.


Shi H.,Xi'an Jiaotong University | Gao N.,Xi'an Jiaotong University | Jin H.,Xi'an Jiaotong University | Jin H.,Far East Holding Group Co.
Materials Science Forum | Year: 2010

The reported enhancement in dielectric properties obtained for polymer nano-composite seemed to be very encouraging. To further understand the dielectric behavior of epoxy nano-composite, aluminum oxide (Al 2O3) nano-particles were incorporated into bisphenol A epoxy resin, and the dependence of nano-particle content and the dielectric properties was investigated in this study. Results showed that, when nano-particle contents was no more than 10phr, relative permittivity (εr) decreased to be lower than that of monolithic epoxy, and the minimum value appeared in 4phr nano-particle filled composite. The minimum value of tan delta (tanδ) appeared in 6phr nano-particle filled composite. DC volume resistivity (ρv) increased due to the introduction of nano-particles when the filler content is very small (about 2phr). © (2010) Trans Tech Publications.


Li H.,Xi'an Jiaotong University | Zhang Q.,Xi'an Jiaotong University | Jin Z.,Xi'an Jiaotong University | Jin H.,Xi'an Jiaotong University | Jin H.,Far East Holding Group Co.
Materials Science Forum | Year: 2010

SiC/C (graphite) composite ceramics with 20vol% flake graphite were fabricated by Plasma Activated Sintering (PAS) firstly; the composites treated by silicon infiltration in surface were oxidized from 800°C to 1500°C. Effect of silicon infiltration on the oxidation resistance of SiC/C (graphite) composites was characterized by TG/DTA, SEM and XRD. The results show that the graphite in surface of composites reacted with silicon to form a dense SiC film about 30μm-in-thickness. The oxidation resistance temperature was increased from 600°C to 1300°C. Below 1300°C, the surface of composites by silicon filtration was oxidized to form a dense continuous oxide film to hider the oxidation of graphite in matrix. At 1500°C, the surface oxide film was heavy damaged, and many micropores were produced; inner graphite was oxidized above 1300°C again. © (2010) Trans Tech Publications.


Jin H.,Xi'an Jiaotong University | Jin H.,Far East Holding Group Co. | Shi H.,Xi'an Jiaotong University | He B.,Xi'an Jiaotong University | And 2 more authors.
Materials Science Forum | Year: 2010

AlN filled epoxy composites were fabricated. The microstructure of composites was observed by SEM. The thermal conductivity was also measured. The results showed that microstructure of AlN/ epoxy composites was different with monolithic epoxy, it had some crystal-like characteristics. The grain size of AlN/ epoxy composites decreased with increasing AlN contents, and the thermal conductivity of composites increased with increasing AlN content. The thermal conductivity of 40wt. % AlN/ epoxy was about 3 times of monolithic epoxy. © (2010) Trans Tech Publications.


Jin H.,Xi'an Jiaotong University | Jin H.,Far East Holding Group Co. | Huang Y.,Xi'an Jiaotong University | Feng D.,Xi'an Jiaotong University | And 2 more authors.
IOP Conference Series: Materials Science and Engineering | Year: 2011

Both AlN/ nano h-BN composites and AlN/ micro h-BN composites were fabricated. The high temperature oxidation behaviors were investigated at 1000°C and 1300°C using a cycle-oxidation method. The results showed that there were little changes of both nano composites and monolithic AlN ceramic at temperature of 1000°C. And at 1300°C, the oxidation dynamics curve of composites could be divided into two courses: a slowly weight increase and a rapid weight decrease, but the oxidation behavior of nano composites was better than micro composites. It was due to that the uniform distribution of oxidation production (Al18B4O33) surround the AlN grains in nano composites and the oxidation proceeding was retarded. The XRD analysis and SEM observations showed that there was no BN remained in the composites surface after 1300°C oxidation and the micropores remain due to the vaporizing of B2O3 oxidized by BN. © Published under licence by IOP Publishing Ltd.


Jin H.,Xi'an Jiaotong University | Jin H.,Far East Holding Group Co. | Huang Y.,Xi'an Jiaotong University | Gao N.,Xi'an Jiaotong University | And 3 more authors.
Journal of Nanoscience and Nanotechnology | Year: 2011

The microstructure and resistivity of AlN/BN ceramic nano-composites and micro-composites were investigated. The results showed that because the nano-BN crystals were homogeneously dispersed around the AlN grains of the matrix, the conductive glass phase surround AlN grains were separated, and it was difficult to form the electric conductible consecutive passageway (than micro composites), the leakage conductance of nano-composites was far lower than micro-composites. Copyright © 2011 American Scientific Publishers All rights reserved.


Li C.M.,Harbin University of Science and Technology | Han B.Z.,Harbin University of Science and Technology | Han B.Z.,Far East Holding Group Co. | Zhao L.,Harbin University of Science and Technology | Yin C.P.,Harbin University of Science and Technology
Advanced Materials Research | Year: 2014

Nonlinear insulated materials can uniform electric field distribution in non-uniform electric field. In order to inhibit the electric tree initiation and propagation inside high-voltage cross-linked polyethylene (XLPE) insulated cable, a kind of 220kV high-voltage XLPE insulated cable with new structure is designed by embedding nonlinear shielding layer into XLPE insulation layer of high-voltage cable with traditional structure in this study. Experimental and simulation results indicate that the nonlinear shielding layer can effectively inhibit electrical tree propagation inside the XLPE specimens, and obviously extend the breakdown time caused by electric tree propagation. When the electrical tree propagates into the nonlinear shielding layer sandwiched between insulation layers of cable, the electric field distribution near the tip of electrical tree is obviously improved. These findings prove the feasibility and the effectivity of inhibiting electrical tree propagation inside high-voltage cable by adding nonlinear shielding layer into the insulation layer. © (2014) Trans Tech Publications, Switzerland.


Li C.-M.,Harbin University of Science and Technology | Zhang G.-X.,Deyang Products Quality Supervision and Inspection Institute | Li C.Y.,Harbin University of Science and Technology | Han B.-Z.,Harbin University of Science and Technology | Han B.-Z.,Far East Holding Group Co.
Advanced Materials Research | Year: 2014

Electrical tree aging is one of the leading factors causing degradation and breakdown of insulation performance of high-voltage cross-linked polyethylene (XLPE) cable. A lot of attention has been paid to inhibiting electric tree initiation and propagation inside high-voltage cable. In this study, insulation composites with nonlinear electrical conductivity are prepared. Experimental results show that these composites are helpful for enhancing the apparent breakdown electric field strength of XLPE in the pole electrode system. A kind of high-voltage XLPE insulated cable with new structure is designed by using these composites as nonlinear shielding layer. Numerical simulation results indicate that nonlinear shielding layer can obviously improve the distribution of electrical field at the defect of insulation surface of high-voltage XLPE cable, and decrease the maximum electrical field strength at the defect. This new structure is potential for effectively inhibiting electrical tree initiation inside high-voltage XLPE insulation cable, thus increasing life span and operational reliability of the cable. © (2014) Trans Tech Publications, Switzerland.

Loading Far East Holding Group Co. collaborators
Loading Far East Holding Group Co. collaborators