Results 251 to 260 of about 164,543 (307)

�-Al2O3 synthesis from m-Al2O3

Journal of Applied Electrochemistry, 1980
β-Al2O3 formation fromm-Al2O3 was found by a new convenient technique. By thermal decomposition of a complex compound, trioxalatoaluminate Na x (NH4)3−x [Al(C2O4)3]yH2O(0.091 ⩽x ⩽ 0.333;y= 3), a very fine powder ofm-Al2O3 was formed.
T. Takahashi, K. Kuwabara
openaire   +1 more source

Plasma spraying of Al2O3 and Al2O3Y2O3

Thin Solid Films, 1976
Abstract A microstructural study has been carried out of plasma-sprayed Al 2 O 3 and mixed and sintered Al 2 O 3 Y 2 O 3 . In order to ascertain the degree of metastability achieved by plasma spraying, these results are compared with a similar experiment utilizing a CO 2 laser for melting and the hammer-and-anvil technique for quenching of the ...
Volker Wilms, Herbert Herman
openaire   +1 more source

Wear behaviour of Al2O3–Mo and Al2O3–Nb composites

Wear, 2007
The wear behaviour of two Al2O3-Mo and two Al2O3-Nb particulate composites with different Mo particle size and Nb contents, respectively, obtained by hot-pressing, was evaluated. The inverted pin-on-disc tests were performed by making ceramic pins slide against WC discs at different loads with a constant sliding speed and sliding distance.
G de Portu, S Guicciardi, C Melandri, F Monteverde   +3 more
openaire   +2 more sources

Thermodynamic assessment of the Al2O3–ZrO2, CaO–Al2O3–ZrO2, and Al2O3–SiO2–ZrO2 systems

Ceramics International, 2022
Abstract All available thermodynamic data and phase diagram data in the Al2O3–ZrO2, CaO–Al2O3–ZrO2, and Al2O3–SiO2–ZrO2 systems at 1 bar total pressure were critically evaluated and assessed simultaneously to obtain a set of the optimized Gibbs energies of all phases in the systems.
Sun Yong Kwon, In-Ho Jung
openaire   +1 more source

Effective fracture toughness in Al2O3–Al2O3/ZrO2 laminates

Journal of the European Ceramic Society, 2007
During the processing of laminar ceramics, biaxial residual stresses can arise due to the thermal mismatch between different layers. For ceramic multilayers, the beneficial consequences of compressive stresses at the surface are well known: increase in strength, apparent toughness and reliability. Nevertheless, the resulting tensile stresses may induce
T Lube, J Pascual, F Chalvet, G De Portu
openaire   +2 more sources

Microstructural study of the κ-Al2O3 → α-Al2O3 transformation in CVD κ-Al2O3

Surface and Coatings Technology, 1992
The microstructural variations occurring during the κ → α transformation in CVD κ-Al2O3 coatings subjected to isothermal heat treatments have been investigated. The microstructures developed in the partly transformed κ-Al2O3 layer (32% α-Al2O3) and fully transformed κ-Al2O3 layer (100% α-Al2O3) were studied and compared with as-deposited κ-Al2O3 (100 ...
J. Skogsmo, M. Halvarsson, S. Vuorinen
openaire   +1 more source

Sulfuration of Pt/Al2O3, Pt−Re/Al2O3 and Pt−Ir/Al2O3 catalysts

Reaction Kinetics and Catalysis Letters, 1982
Three reforming catalysts Pt/Al2O3, Pt−Ir/Al2O3 and Pt−Re/Al2O3 have been sulfurated by H2S and tested by their activities in benzene hydrogenation. By treatment at 500°C under hydrogen flow only a part of the initial activity of the non-sulfurated catalyst is retained. So only a part of the adsorbed sulfur is easily removed in these conditions.
C. Apesteguia, J. Barbier
openaire   +1 more source

Differences in the catalytic properties of Al2O3 and Pt/Al2O3

Reaction Kinetics and Catalysis Letters, 1983
The different behaviors of Al2O3 and Pt−Al2O3 for typical hydrocarbon reactions were studied at 500°C and atmospheric pressure. Pt−Al2O3 reached higher total conversion levels, was more easily deactivated and produced more coke deposition than Al2O3 due to reactions catalyzed by Pt (hydrogenolysis and dehydrogenation).
J. M. Parera, N. S. Fígoli, G. E. Costa, M. R. Sad   +3 more
openaire   +1 more source

Adsorption and spillover of hydrogen on Al2O3 and Pt/Al2O3

Applied Catalysis, 1987
Abstract Hydrogen adsorption on alumina, Pt/Al 2 O 3 -Cl, and their mixtures at 500°C and under atmospheric pressure was studied using a volumetric technique. Alumina with and without chlorine adsorbed 0.054 cm 3 STP g −1 showing that chloride ions do not affect the adsorption.
J.C. Musso, J.M. Parera
openaire   +1 more source

Mechanisms of hydrodenitrogenation of alkylamines and hydrodesulfurization of alkanethiols on NiMo/Al2O3, CoMo/Al2O3, and Mo/Al2O3

Journal of Catalysis, 2005
Abstract The simultaneous hydrodenitrogenation (HDN) of alkylamines and hydrodesulfurization (HDS) of alkanethiols, with the NH2 and SH groups attached to primary, secondary, and tertiary carbon atoms, were studied at 270–320 °C and 3 MPa over sulfided NiMo/Al2O3, CoMo/Al2O3, and Mo/Al2O3 catalysts.
Y ZHAO, R PRINS
openaire   +1 more source