Now showing items 1-10 of 132
THE INFLUENCE OF THE ELECTROCHEMICAL TREATMENT ON CU-AL-AG ALLOYS IN DEAERATED 0.5M NAOH
(Journal of Applied Electrochemistry, 1991-05-01) [Artigo]
The effect of consecutive cyclic polarization in de-aerated 0.5 M NaOH solutions on the surface microstructure of mechanically polished Cu-Al-Ag alloys of different compositions and heat treatments has been studied using ...
Synthesis and sintering of ultra fine NaNbO3 powder by use of polymeric precursors
(Materials Letters, 1996-09-01) [Artigo]
Ultra-fine NaNbO3 powder was prepared by the use of polymeric precursors. X-ray diffraction (XRD) results showed that this niobate nucleates from the amorphous precursor, with no intermediate phases, at low temperature ...
Kinetics of eutectoid decomposition in Cu-Al and Cu-Al-Ag alloys
(Materials Letters, 1997-08-01) [Artigo]
The kinetics of eutectoid decomposition beta(1)' --> gamma(2) + (alpha + gamma(2)) in Cu-12.86 wt% Al and Cu-12.84 wt% Al-1.98 wt% Ag alloys was studied by hardness measurements, using the Johnson-Mehl-Avrami equation. The ...
EFFECT OF THE ADDITION OF CR AND NB ON THE MICROSTRUCTURE AND ELECTROCHEMICAL CORROSION OF HEAT-TREATABLE AL-ZN-MG ALLOYS
(Journal of Applied Electrochemistry, 1995-08-01) [Artigo]
The effect of the addition of Cr and Nb on the microstructure and the electrochemical corrosion of the weldable, high-strength and stress corrosion cracking (SCC) resistant Al-5%Zn-1.67%Mg-0.23%Cu alloy (H) has been studied. ...
Voltammetric study of Al-Zn-Mg alloys in chloride solutions
(Journal of Applied Electrochemistry, 1999-10-01) [Artigo]
SYNTHESIS OF ULTRA-FINE CRYSTALLINE ZRXTI1-XO4 POWDER BY POLYMERIC PRECURSOR METHOD
(Materials Letters, 1995-02-01) [Artigo]
Reactive ZrxTi1-xO4 (x=0.65, 0.50 and 0.35) powder was prepared by the polymeric precursor method. Studies by X-ray diffraction (XRD), nitrogen adsorption/desorption, and thermogravimetric analysis (TG) showed that powders ...
Structural and electrical properties of SrBi2Nb2O9 thin films prepared by chemical aqueous solution at low temperature
(Materials Letters, 1999-07-01) [Artigo]
SrBi2Nb2O9 (SBN) thin films were prepared by the polymeric precursors method and deposited by dip coating onto Pt/Ti/SiO2/Si(100) substrates. The dip-coated films were specular and crack-free and crystallized during firing ...
Synthesis of PbTiO3 by use of polymeric precursors
(Materials Letters, 1998-09-01) [Artigo]
Lead titanate powders were synthesized through the use of polymeric precursors according to the Pechini Process. The polymeric precursor was calcined at temperatures ranging from 300 to 600°C for 1 or 2 h. X-ray diffraction ...
Time evolution of the structure function and dynamical scaling in porous SnO2 dry gels
(Nuclear Inst. and Methods in Physics Research, B, 1995-05-02) [Artigo]
An in situ study of the structural evolution of a porous SnO2 dry gel, under isothermal conditions, was carried out by means of the SAXS technique. The time evolution of the structure function is in agreement with the ...
A comparative study of the corrosion of high copper dental amalgams
(Materials Letters, 1998-07-01) [Artigo]
Metallographic studies carried out for Tytin-Plus and Dispersalloy amalgams show a porous multiphase material, whose surface phases are: gamma-(Ag3Sn), gamma(1)-(Ag2Hg3), eta'-(Cu6Sn5) and epsilon-(Cu3Sn). Additionally, ...