Journal of Materials Synthesis and Processing
1573-4870
1064-7562
Cơ quản chủ quản: N/A
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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......
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......
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......
Self-Propagating Reactions in the Ti–Si System: A SHS-MASHS Comparative Study
Tập 8 - Trang 377-383 - 2000
In this work, we report on the self-propagating reaction in Ti–Si blends, observed by SHS and MASHS (mechanical activated SHS) techniques. In spite of the differences between the two reacting methods, correlations were found between the key parameters of the two modes of activation. Moreover, this comparative study enabled us to gain some hints on the reaction mechanism. The combustive behavior of......
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......
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.
Sintering Behavior of Hot-Pressed Ca–αSialon Ceramics
Tập 7 - Trang 35-39 - 1999
On the basis of phase relationships in the Ca–Si–Al–O–N system, a Ca–α–sialon ceramic was synthesized using the hot-pressing technique. The reaction sequences and densifications of the Ca–α–sialon vs. firing temperatures have been characterized in detail. The present experiments reveal a reaction sequence as follows: at 1250°C the reactant mixture started to soften, at 1300°C a gehlenite phase was......
Reaction Driven Elastic Waves in Solid Media
Tập 6 - Trang 105-113 - 1998
Chemical reactions and phase transformations couple in solid systems with the stress fields. When reaction rates become of the same order as the rate of relaxation of mechanical perturbations, the reactions can stabilize elastic waves in the system. Density varies with temperature and conversion and since the elastic waves are driven by the gradients in temperature and conversion, these source ter......
Mathematical Model of Compact Changes in Volume during Liquid-Phase Sintering. II
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The mathematical model for the quantitative circumscription of volume changes of compacts from interacting components during liquid-phase sintering has been determined. The results of numerical calculations obtained on the basis of the created model qualitatively correlates with experimental data described in the literature.