Materials Literature
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Influence of residual porosity on the flexural strength and fracture toughness of pressureless-sintered α-SiC ceramic with controlled microstructure, characterized by equiaxed-grain and a mixture of equiaxed/plate grains were investigated together with the trend of σ-KIC behavior. Both the flexural strength and the fr…
The Si-Ti-C-O fiber (STC (6)) with a low oxygen content of 6mass% was oxidized at temperatures in the range of 1273 to 1773K in order to measure its oxidation rate and thereby to elucidate its oxidation behavior. These results were compared to those of the commercial fibers having 18 and 13mass% O (STC (18) and STC (1…
Magnetic properties and domain structure were investigated for die-drawn and subsequently annealed Fe-Si-B amorphous wires. It was found that the die-drawn wire has a bamboo domain similar to that of the Co based wire with negative magnetostriction and looses the re-entrant flux reversal characteristic. It was also fo…
Stishovite, the SiO2 polymorph obtained at extremely high pressure with octahedrally coordinated Si atoms, has been characterized by means of techniques usually employed in surface chemistry. Its surface properties have been investigated in order to explain why stishovite is the only non-pathogenic SiO2 crystalline po…
The formation of metal-ceramic multi-phase microstructures by partial reduction of ternary or higher ceramic oxides has been experimentally investigated in the model system FeMnO and in the more practical system AlNiO by changing the oxygen partial pressure at constant temperature and total pressure. In the FeMnO syst…
Summary A type 329J1 duplex stainless steel was welded by single‐pass gas tungsten arc welding in an argon‐nitrogen mixed gas atmosphere. The microstructure, Vickers hardness, and Charpy impact toughness of the weld metal were examined. The nitrogen content increases and the ferrite content decreases with increasing n…
The Pitzer ion-interaction model was employed to predict the conversion in the title quaternary water-salt system. The thermodynamic solubility products (K s 0 ) were determined and the conversion of CaSO 4 to CaCO 3 in the CaSO 4 + Na 2 CO 3 = CaCO 3 + Na 2 SO 4 system was predicted. The standard molar Gibbs free ene…
Pd/Al2O3 samples of different palladium loadings were prepared by an incipient wetness technique. The palladium dispersion (D) of each sample was estimated from its isotherm of hydrogen uptake measured volumetrically at 298 K. The isosteric heat of hydrogen sorption (q, including absorption and adsorption) on palladiu…
The combustion behavior of several elemental materials was studied using their threshold pressures (minimum pressure required to sustain combustion in 3.2-mm-(0.13-inch) diameter rod) as the ranking criterion in a promoted combustion test apparatus. Test media varied from 100% aviator's breathing oxygen to air and the…
The key to conducting an accurate damage assessment of a target impacted by a high speed projectile is the use of a robust assessment methodology. To accurately determine total target damage, a damage assessment methodology must include the effects of discrete impacts by solid debris cloud fragments as well as impulsi…
Chemical states of Mn in BaTiO3 and interactions between Mn and other dopants were studied mainly by chemical analysis and ESR spectroscopy. Chemical analysis showed that the average valency of Mn doped into BaTiO3 was about 3.4, indicating the occurrence of a significant concentration of oxygen vacancy. The average v…
V 1– x W x O 2 and V 1– x Mo x O 2 , 0 < x < 0.03, powders have been produced by the evaporative decomposition of solutions of vanadyl sulfate hydrate with tungsten dioxide dichloride or molybdenum dioxide dichloride in a hydrogen/nitrogen atmosphere. The powders consist primarily of hollow, porous, spherical sh…
This work, based on the Doctoral thesis of the autor (Santamaria, 1991), deals on the sistematics of the superfamiliy Acanthocerataceae from the Upper Cenomanian to Santonian of the northern part of the North-Castillian platform and the southern part of the Navarro-Cantabrian basin. In this second part fifty ammonite…
The palladium(II) complexes cis-[PdCl2([18]aneS2O4)], [Pd([18]aneS2O4)2][PF6]2([18]aneS2O4= 1,4,7,10-tetraoxa-13,16-dithiacyclooctadecane), [Pd([18]aneS3O3)2][PF6]2([18]aneS3O3= 1,4,7-trioxa-10,13,16-trithiacyclooctadecane) and [PdCl([20]aneS3O3)]BPh4([20]aneS3O3= 1,4,7-trioxa-10,14,18-trithiacycloicosane) have been s…
The dissolution behaviour of a 22% chromium duplex stainless steel with very low nitrogen content and containing various amounts of ruthenium was investigated. It was found that the ruthenium additions inhibits the anodic dissolution behaviour when active corrosion took place. Furthermore it was established that only…
This paper reviews the designs and performance of tubular solid oxide fuel cells (SOFCs). A large number of tubular cells of the porous support tube type have been electrically tested, some to times over 50,000 hours; these cells have shown excellent performance and performance stability. Since 1984, successfully larg…
The impact properties of the thermoplastic composites containing ground rubber tires (GRT) have been investigated. Linear low density polyethylene (LLDPE) was used as the thermoplastic polymer matrix. Ground rubber tire crumb of average mesh sizes 40 (GRT40) and 80 (GRT80) were used. To improve the impact strength dif…
Single crystals of non-linear Huntite-type borates, with good optical quality, have been grown by slow cooling from fluxes based on the K2O-MoO3 system. Crystals corresponding to the general formula Y1-xNdX(Al0.7Ga0.3)3(BO3)4(x = 0.05 and 0.15) were obtained with a relatively small size (3 × 3 × 3 mm3) whereas those w…
A simple method is described for measuring the time dependency of the magnetization reversal process in the yoke of thin-film inductive write heads. Measurement results are given for an experimental head, showing close agreement with earlier published, calculated data.
Only recently has it been possible to make iron based analogues to Sm-Co based compounds that exhibit energy products of greater than 20 MG De. These compounds have generally been in the form of pseudobinaries since some other element is required either to help stabilise the crystal structure or to modify the anisotro…