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A methodology to recover the non-ohmic properties of ZnO based varistors after degradation with long and short duration pulses was proposed in this work. The basic idea consists in submitt the degraded ceramics at different temperatures and oxygen flows. Thermal treatment at 900 °C for 2 h with...
Room temperature creep (RTC) at a crack tip and its influence on the fatigue crack growth behavior of a 304 stainless steel have been studied at room temperature. A time-dependent deformation has been observed at the crack tips under various stress intensity factors. The deformation increases...
Impact fatigue properties of unidirectional carbon fibre-reinforced polyetherimide (PEI) composites was evaluated by subjecting standard izod impact samples to low velocity impact loading at energy levels ranging 0.16–1.08 J by using Ceast Model Resil 25, a pendulum type instrumented impact...
Ceramic thermal barrier coatings (TBCs) are playing an increasingly critical role in advanced gas turbine engines due to their ability to sustain further increases in operating temperatures. However, these increases in temperature could raise considerable issues associated with increased...
The metallurgical study of Pb–2wt.%Sm and Pb–0.08wt.%Ca–2wt.%Sm has been performed from hardness measurements, DSC tests, TEM and SEM observations. It has been shown that the binary alloys do not hardened by microprecipitation of an intermetallic phase such as Pb 3 Sm: after 2 years, the...
The crystallization and subsequent melting behaviour of absorbed water in the model composites of polyamide 6 (PA6) and carbon fibre were investigated by differential scanning calorimetry (DSC) in comparison with those in neat PA6, using the small rectangular specimens exposed to water at 90 °C....
Single-phased spinel-related titanium-substituted Li 0.5 Fe 2.5 O 4 has been synthesized by sintering in air a mechanically pre-milled mixture of lithium carbonate, corundum-related iron (III) oxide and the rutile polymorph of titanium (IV) oxide at 700 °C (12 h). This temperature is ca....
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