Journal of Materials Synthesis and Processing
1573-4870
1064-7562
Cơ quản chủ quản: N/A
Lĩnh vực:
Các bài báo tiêu biểu
Conversion of the Echinoderm Mellita eduardobarrosoi Calcite Skeleton into Porous Hydroxyapatite by Treatment with Phosphated Boiling Solutions
Tập 7 - Trang 211-219 - 1999
The influence of the boiling solution technique (a nonhydrothermal wet treatment) in the formation of hydroxyapatite (HA) from a novel source, an echinoderm known as Mellita eduardobarrosoi, whose skeleton contains calcite as an inorganic constituent, was investigated. The experimental plan explores the conversion using a batch boiling system composed of KH2PO4 + KOH aqueous solutions at initial p...... hiện toàn bộ
MSR Reduction of Hexachlorobenzene
Tập 8 - Trang 295-300 - 2000
This paper deals with the mechanochemical degradation of hexachlorobenzene over Li, Na, K, Mg, Ca, Ba, Ti, and W. Apart from the mixtures containing Ti and W, the other systems react in a combustive mode leading to the chlorides and the carbides of the inorganic substrates. Reaction stoichiometries and heats were experimentally determined. The activation time required to ignite the reaction decrea...... hiện toàn bộ
Reaction Bonding of Three-Layer Alumina-Based Composites
Tập 7 - Trang 195-203 - 1999
Three-layer alumina-based composites with Al2O3-containing mullite as the outer layer and ZrO2-containing alumina as the inner layer were fabricated by die-pressing and reaction bonding. The effects of the outer-layer compositions on the densification behavior of three-layer composites were investigated. The existence of residual stresses in the layers was verified using indentation methods. Compa...... hiện toàn bộ
Effect of Oxygen Content on Grain Growth Kinetics of Titanium
- 2002
The grain growth kinetics of commercially pure Titanium with different contents of oxygen have been studied. The grain size parameters have been measured by means of the Image Analysis Technique for different heat treatment temperatures and times. The growth exponents and activation energies have been calculated. Finally, tensile tests on the same materials have been carried out. When the intersti...... hiện toàn bộ
Process Parameters in Attrition Milling of Cordierite Powders
Tập 6 - Trang 115-121 - 1998
A commercial cordierite powder was selected to study the particle size reduction under several attrition milling conditions. The influence of milling parameters such as the rotor speed, solid loading, and milling time on the attrition milling process was studied in terms of the particle size distributions, mean diameters, specific surface areas, and media wear contamination of the milled powders.
The Kinetics of Pore Shape Evolution in Alumina
Tập 6 - Trang 161-167 - 1998
The kinetics of shape evolution of a completely faceted crystal/internal void by surface diffusion was modeled. Arrays of micron-sized cavities were generated in sapphire substrates with known surface orientations using microlithography and ion beam etching and converted to internal intragranular pores of nonequilibrium shape by diffusion bonding of the etched substrate to an identical-orientation...... hiện toàn bộ
Effects of a Rotating Magnetic Field on Gas Transport during Detached Crystal Growth in Space
Tập 9 - Trang 73-81 - 2001
During the detached Bridgman growth of semiconductor crystals, the melt has a short free surface, which is detached from the ampul wall near the crystal–melt interface, thus eliminating the crystal defects caused by contact with the ampul wall. Recent modeling has indicated that initiation and continuation of detached growth depends on the rate of transport of dissolved gas from the crystal–melt i...... hiện toàn bộ
Mass-Spectrometric Study of the Kinetics of Ionic and Molecular Sublimation of Sodium Chloride Single Crystals
Tập 7 - Trang 379-385 - 1999
A mass-spectrometric method is used to study the kinetics of ionic and molecular sublimation of sodium chloride single crystals. The positive ions Na+, Na2
+, and Na2Cl+ were identified in the mass spectrum in the temperature range 820–970 K. Up to 970 K no emission of negative ions was observed. The temperature dependence of thermal ion currents, lnI
i − (1/T), exhibits a maximum and a minimum su...... hiện toàn bộ
Electronic Structure of Mn Acceptor Impurity Incorporated SrTiO3 Using Embedded Cluster Method
Tập 6 - Trang 323-328 - 1998
We have performed atomic-level first principle electronic structure calculations on doped grain boundaries (GB) in SrTiO3. This was motivated by the electron holography experiments, which were able to quantify the electrostatic potential and the associated space charge distribution across the Mn-doped GB in this material. The embedded cluster Discrete Variational (DV)-Xα method was used to determi...... hiện toàn bộ
Stabilization of New Phases in Ion-Conducting Nanocomposites
Tập 8 - Trang 319-326 - 2000
Physical properies of ion-conducting nanocomposites are reviewed. Special attention is paid to the change of the bulk characteristics of ionic salts in the nanocomposites due to the formation of the interface phases. The main thermodynamic reason of the formation of the nanocomposite as well as the stabilization of the interface phases is the adhesion energy σa. At sufficiently high σa values, the...... hiện toàn bộ