Carbon nanotubes±Fe±Al2O3 massive composites have been prepared by hot-pressing the corresponding composite powders, in which the carbon nanotubes are arranged in bundles smaller than 100 nm in diameter and several tens of micrometers long, forming a web-like network around the Fe±Al2O3 grains. In the powders, the quantity and the quality of the carbon nanotubes both depend on the Fe content (2...

In this study, BaZrO3:Eu0.025 powder was synthesized through the solid-state reaction method with two different heating processes. For the one-step process, the BaZrO3:Eu0.025 powder was heated to 1000 ̋C–1400 ̋C for 2 h. For the two-step heating process, the BaZrO3:Eu0.025 powder was pre-heated at 800 ̋C for 2 h, after being cooled to room temperature and ground, then the powder was heated to ...

Three kinds of Bi-based solder powders with different chemical compositions of binary Bi–Sn, ternary Bi–Sn–In, and quaternary Bi–Sn–In–Ga were prepared using a gas atomization process and subsequently ball-milled for smaller-size fabrication. In particular, only the quaternary Bi–Sn–In–Ga solder powders were severely broken to the size of less than 10 μm in a polyhedral shape due to the presenc...

The aim of this study represents the synthesis, characterization and photocatalytic activity determination of ZnO nanopowders synthesized using modified Pechini method. The obtained powders were characterized in what concerns their composition using X-ray diffraction, morphology using scanning electron microscopy and transmission electron microscopy and in what concerns the photocatalytic activ...

The compression of ceramic powders requires the addition of organic materials to insure tablet cohesion. For the compaction of formulated ceramic powders it is necessary to supply them energy. As a function of the formulation of ceramic powders, one can measure the specific energy acquired during the tablet compression. Recently, a technique used in powder metallurgy, High Velocity Compaction (...

Far-infrared rays have certain kinds of effects on the human body, especially on skin, blood circulation, and skin cell vitalizing. Some jewelry powders radiate far-infrared rays. Jade has powerful far-infrared ray radiation, and tourmaline has pyroelectric and piezoelectric properties and radiated far-infrared rays. The jewelry powders (fine powdered jade and tourmaline powders) were screened ...

medicinal plant powders have traditionally been used as grain protectants against stored-product insect pests. in this study, insecticidal activity of carum copticum l. and cuminum cyminum l. powders was assessed on adults of sitophilus granarius l. and tribolium confusum jacquelin du val. experiments were carried out on wheat at 27 ± 1 ºcand 55 ± 5% r. h. the mortality increased with increasin...

Open-celled titanium foams were fabricated by vacuum hot pressing of a blend of Ti and NaCl powders followed by NaCl removal in water. Densification kinetics of the Ti/NaCl blends are measured at 780 ◦C at various pressures (30–50MPa), NaCl volume fractions (30–70%) and NaCl powder sizes (50–500 m). As compared to pure Ti powders, densification kinetics of the blends is faster for relative dens...

A lot of metallurgical processes take places in shaft furnaces, where reacting gas carrying powders flows up in packed bed of descending metallurgical materials. Gas + powder two phase flow in fixed packed bed has been investigated by author for many years 1 . At present author undertakes the investigations with moving bed. Physical model with glass bed and glass powders was constructed. The ex...

A versatile one-pot auto-combustion method for the synthesis of powders of iron-doped strontium titanate, SrTi1-xFexO3-δ, has been developed. The synthesis is optimised by the combined use of EDTA and citric acid as chelating agents, and an appropriate balance between fuel and oxidising elements in the reaction mixture. The method produces immediately an almost phase-pure perovskite oxide powde...