Buscar
Mostrando ítems 1-10 de 16
Artículo
Larnite powders and larnite/silica aerogel composites as effective agents for CO2 sequestration by carbonation
(Elsevier, 2009)
This paper presents the results of the carbonation reaction of two sample types: larnite (Ca2SiO4) powders and larnite/silica aerogel composites, the larnite acting as an active phase in a process of direct mineral ...
Artículo
Diffusion-driven superplasticity in ceramics: Modeling and comparison with available data
(2009)
The discovery of superplasticity in ceramics polycrystals led to debates about whether or not earlier models developed for metallic polycrystals can apply to these systems. In particular, all existing models require ...
Artículo
Specific Heat Measurements on Amorphous and Nanocrystalline Al88Y5Ni5Co2
(Elsevier, 2009)
Specific heat at constant pressure, CP, was measured on amorphous and nanocrystalline Al88Y5Ni5Co2 alloys from differential scanning calorimetry experiments. Linear behavior of CP versus temperature from 323 to 423 K is ...
Artículo
The magnetocaloric effect in materials with a second order phase transition: Are T C and T peak necessarily coincident?
(AIP Publishing, 2009)
Using the Arrott–Noakes equation of state it is shown that the Curie point TC and the temperature where the magnetic entropy change is maximum Tpeak coincide only in the mean field approximation, but the Heisenberg ...
Artículo
Magnetocaloric response of Fe75Nb10B15Fe75Nb10B15 powders partially amorphized by ball milling
(AIP Publishing, 2009)
The magnetocaloric response of mechanically alloyed Fe75Nb10B15 powders was studied for samples with different amorphous and nanocrystal volume fractions. Thermomagnetic properties scale following a 3 law for different ...
Artículo
Supersaturated Solid Solution Obtained by Mechanical Alloying of 75% Fe, 20% Ge and 5% Nb Mixture at Different Milling Intensities
(Elsevier, 2009)
Mechanical alloying process of Fe75Ge20Nb5 composition has been studied at different milling frequencies from initial pure powder mixture to the development of a single bcc phase (supersaturated solid solution). As an ...
Artículo
Correlation between microstructure and temperature dependence of magnetic properties in Fe 60 Co 18 ( Nb , Zr ) 6 B 15 Cu 1 alloy series
(AIP Publishing, 2009-05-14)
Temperature dependence of magnetic properties of nanocrystalline Fe60Co18Cu1B15Nb6−xZrx (x =0, 3, 6) alloys has been studied at different stages of devitrification. Transmission electron microscopy shows nanocrystals of ...
Artículo
An investigation of silicon carbide-water nanofluid for heat transfer applications
(AIP Publishing, 2009)
Thermal conductivity and mechanical effects of silicon carbide nanoparticles uniformly dispersed in water were investigated. Mean size of SiC particles was 170 nm with a polydispersity of 30% as determined from small-angle ...
Artículo
Nanostructured sonogels
(Trans Tech Publications Ltd, 2009)
Acoustic cavitation effects in sol-gel liquid processing permits to obtain nanostructured materials, with size-dependent properties. The so-called "hot spots" produce very high temperatures and pressures which act as ...
Artículo
Field dependence of the adiabatic temperature change in second order phase transition materials: Application to Gd
(AIP Publishing, 2009-11-19)
The field dependence of the adiabatic temperature change LlTad of second order phase transition materials is studied, both theoretically and experimentally. Using scaling laws, it is demonstrated that, at the Curie ...