Materials Literature
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In this paper, similar metal oxide-based arresters are tested using accelerated ageing tests with low and high total harmonic distortion content in the AC voltage stress. The extrapolated ageing times obtained are modelled using the three-parameter Weibull statistical distribution. The hypothesis testing based on the…
Moisture in a high power Insulated Gate Bipolar Transistor (IGBT) module raises serious concern on component and system level reliability. Employing diagnostic test methods on high power IGBT modules might provide an opportunity in detection and estimation of moisture, however has not received wide attention. This pap…
In recent years, Gas Insulated Switchgear (GIS) is becoming compact which implies a relatively high electric field in the enclosure. In the result, its compactness can make metallic particles move easily. To suppress the movement of particles in the tank of GIS, the nonlinear resistive coating has been developed [1].…
4-(1-Benzotriazolyl)-5-(4-tritylphenoxy)phthalonitrile was synthesized by nucleophilic substitution of bromine and nitro group of 4-bromo-5-nitrophthalonitrile, and on its basis the corresponding octa-substituted phthalocyanines were obtained. Spectral properties of the synthesized compounds were investigated.
Silicon carbide is used in the production of construction and temperature-resistant goods, capable of withstanding high mechanical and thermal loads. During recent times, silicon carbide has been frequently used in the electronics industry. Since sintered silicon carbide has increasingly been used as a replacement for…
Chrysotile samples with macroscopically ordered channels filled by gold and silver have been studied using optical transmission spectroscopy. The channels had inner diameters below 5 nm and lengths up to about 1 cm. The transmission spectra of samples strongly depend on the polarization of probing light. The observed…
This paper describes the magnetic cooling device model designed and built at the Institute of Non-Ferrous Metals in Gliwice, which utilizes reciprocating motion of a magnetic field source and a cyclic flow of a coolant through regenerator. The regenerator made from gadolinum made it possible to obtain an adiabatic tem…
Thermomechanical properties of microactuators with shape-memory effect (SME) based on the Ti 2 NiCu/Pt layered composite are analyzed. Atomic-force microscopy is used to experimentally determine rigidity of the composite microactuators that represent cantilevers with sizes of 50 × 2 × 1 μm and a thickness of the SME a…
It was shown that molded specimens of polymer composite materials can be obtained by an extrusion method by melt blending of Fluoroplast F-2 MB (modified poly(vinylidene difluoride)) and oxyfluoride glasses of the composition 3B 2 O 3 (40SnF 2 –30SnO–30P 2 O 5 ). The compositions of the observed phases of the composit…
Band structures, density of states, and absorption spectra of pure, Nd doped, C doped, and Nd-C codoped TiO2 are calculated using first-principles based on density functional theory. Calculation results show that Nd 4f state forms empty impurity energy levels below conduction band, and C 2p state together with Nd 2f s…
We report a detailed high pressure study on Eu1−xSrxTiO3 polycrystalline samples using synchrotron x-ray diffraction. We have observed a second-order antiferrodistortive phase transition for all doping levels which corresponds to the transition that has been previously explored as a function of temperature. The analys…
Undoped (1 – x )BiFeO 3 – x PbTiO 3 binary solid solutions (0 ≤ x ≤ 0.50, Δ x = 0.1) are obtained via a solid-state reaction combined with sintering in accordance with conventional ceramic technology. Features of their crystal structure formation and dielectric properties are studied in a wide range of temperatures an…
Mg alloys could potentially be used as the structural materials of next-generation high-speed transportation systems on account of their extremely low density (1.7 Mg/m3). However, the plastic formability of Mg alloys at room temperature is poor, which can be attributed to the hexagonal close-packed (hcp) crystal stru…
Abstract Phosphors of europium activated terbium tungstate (Tb 2 (WO 4 ) 3 :Eu 3+ ) were successfully prepared by hydrothermal method with the subsequent calcination treatment. The precursors presented flower‐like microstructures assembled from many nanoflakes, and various morphologies were obtained by controlling the…
Progress of technology and medicine dictates the ever-increasing requirements (heat resistance, corrosion resistance, strength properties, impregnating ability, etc.) for non-Newtonian fluids and materials produced on their basis (epoxy resin, coating materials, liquid crystals, etc.). Materials with improved properti…
The thermal diffusion, heat capacity, and thermal conductivity of BiFeO 3 , Bi 0.91 Nd 0.09 FeO 3 , and BiFe 0.91 Mn 0.09 O 3 multiferroics have been studied at high temperatures (300–1120 K). The dominant mechanisms of phonon transfer in the regions of the antiferromagnetic and ferroelectric phase transitions have be…
A novel magnetoelectric (ME) laminated composite structure is proposed in this work, aiming to provide a good self-vibration cancellation performance under the magnetic field detection environment. The proposed structure consists of two Terfenol-D magnetostrictive alloy plates which are revised and length-magnetized b…
The searches for large-gap quantum spin Hall insulators are important for both practical and fundamental interests. In this work, we present a theoretical observation of the two-dimensional fully fluorinated stanene (SnF) by means of density functional theory. Remarkably, a significant spin-orbit coupling is observed…
The number of point defects formed in spherical cementite and Cr23C6 inclusions embedded into ferrite (α-iron) has been studied and compared against cascades in pure versions of these materials (only ferrite, Fe3C, or Cr23C6 in a cell). Recoil energies between 100 eV and 3 keV and temperatures between 400 K and 1000 K…
Abstract This article describes the integration of thermodynamic modeling, mobility database, and phase-transformation crystallography into phase-field modeling and its combination with transformation texture modeling to predict phase equilibrium, phase transformation, microstructure evolution, and transformation text…