Materials Literature
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We have analyzed the correlation between insulator surface copper contamination and time-dependent dielectric breakdown (TDDB) quantitatively for the first time. TDDB lifetime strongly depends on the copper contamination after CMP process, and it is important to control the redox potential to be less than -0.5 V vs. N…
For the size reduction of electric power equipment, an increase of electric field stress around solid insulators is carefully to be considered. The application of FGM (Functionally Graded Materials) with spatial distribution of dielectric permittivity (epsiv-FGM) will be an effective solution for this concern. In this…
Superior contamination flashover voltage performance of polymer insulators for transmission or distribution line is attributable not only to the hydrophobicity of silicone rubber housing material but also to their configurations. In the case of transmission or distribution line polymer insulators, core diameters are s…
Abstract The general formula of the amphiboles of this series may be written as Na x Mg 2 (Mg (5- y ) Al y ,)(Si (8- z ) Al z )O 22 (OH) 2 , where Mg = Mg + Fe 2+ + Mn 2+ and Al = Al + Fe 3+ + Ti. The individual < T –O> distances are linear functions of their [4] Al content, and the [4] Al content is strongly or…
Effects of untreated calcium carbonate (CaCO3) of different sizes, and silane pretreated CaCO3 fillers on properties of polyurethane (PU) composites (PU/CaCO3) were investigated. Small angle X-ray scattering research of phase structure and morphology has shown significantly stronger influence of the CaCO3 nanofillers…
This paper reports a study on the effect of phase change material (PCM) in design of cold protective clothing. Two clothing systems with the same structural design, one was smart clothing (clothing C) was treated with PCM, the other one was moisture management clothing (clothing B), were tested in a climate chamber wh…
Abstract The effect of red phosphorus was found to be effective for flame‐retardancy of a pure cotton fabric. The laundered bone‐dried weighed samples were impregnated with red phosphorus at suitable concentrations. Vertical flame spread test was accomplished. The optimum add‐on value to impart flame‐retardancy onto c…
The vanadium orthoborate VBO 3 was synthesized under high-pressure / high-temperature conditions of 7.5 GPa and 1250 °C in a Walker-type multianvil apparatus. The crystal structure was determined on the basis of single crystal X-ray diffraction data, collected at r. t. The title compound crystallizes in the trigonal c…
Recyclization of poly (ethyleneterphthalate), (PET), with Diethanolamine and Triethanolamine having 1:2 wt% of PET: wt% of DEA or wt% TEA, in presence of manganese acetate as a catalyst. The inhibition action of the prepared compounds (D2 & T2) on the corrosion of carbon-steel which used in the manufacture of petroleu…
Polymer nanocomposites are defined as polymers in which small amounts of nanometer size filers are homogeneously dispersed and will have a potential significant impact on materials mechanical, electrical and thermal properties etc. In power industry, electrical insulating polymers usually incorporate inorganic fillers…
This paper focuses on the development of insulation systems for high-speed and hence high-frequency electric motors with multi-MW ratings. With the growing demand for variable speed applications, an increasing number of medium and high voltage (4-13.8 kV) motors are being powered by adjustable speed drives (ASD's). On…
The effect of microwave irradiation (MW, 1.55 kW at 2450 MHz on the dissolution chitosan(CHI) and on the properties of the solutions was studied and the results compared with those obtained by using mechanical stirring. MW effects were tested by analysing the viscosity of the solutions as well as the properties of the…
At present, the detection methods of electric device faults are often undertaken by infrared imaging system, ultrasonic imagining system, etc. However, these techniques have some inherited shortcomings. As to the high insulation level of an ultra high voltage system, the long distance from ground exists. Thus it needs…
Multiwalled carbon nanotube (MWCNT) reinforced and unfilled epoxy resins were prepared. Viscosity tests were run on the MWCNT filled and unfilled resins, comparative tensile, three point bending and Charpy impact tests were performed. The viscosity of MWCNT filled epoxy resin has increased by from three to one order o…
Abstract A principal possibility of the utilization of polymer peroxides for the modification of polymer surfaces that provides an immobilization of the tailored quantity of peroxide groups at them has been established. The processes of polymer surface activation with following “grafting from” or “grafting to” utilizi…
A novel diamine monomer containing the alicyclic unit 1,4‐bis(4‐aminophenoxymethylene) cyclohexane (BAMC) was synthesized successfully and employed in the preparation of polyimides with two aromatic dianhydrides by a two‐step procedure. Experimental results indicate that the resulting polyimides show exceptional therm…
Syntactic foam is a special kind of composite material. It usually consists of a polymer matrix (called binder) and hollow spherical particles with a diameter in the range of 20 - 120 mum (microspheres) which are mixed into the binder. Due to the gas in the microspheres, the material structure of syntactic foam is sim…
Novel porous polyimides (PIs) having diameters of several hundred nanometers have been fabricated successfully from precursor poly(amic acid) (PAA) derivatives with poly(acrylic acid) (PAS) as the porogen, using a reprecipitation method and subsequent imidization. The superficial high porosity with deep pores was intr…
This paper addresses some specific design issues encountered in the development of isolation transformers for the rolling stock auxiliary power supply (APS). The optimal transformer design rule of the copper and core loss equalization will not work for middle-frequency (500...3000 Hz) high-power transformers. Main att…
We demonstrate the printing of carbon nanotube (CNT) solution using the electrostatic inkjet nozzle and the field emission from the printed CNT. The CNT solution was prepared from the water-soluble single-wall CNT. An electrostatic inkjet nozzle having a needle inside a capillary was built in-house, which was able to…