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......
Synthesis of TiC Whiskers through Carbothermal Reduction of TiO2
Tập 9 - Trang 1-10 - 2001
TiC whiskers were produced through carbothermal reduction of TiO2 in the presence of potassium (K2CO3) and nickel (NiCl2). The effect of potassium, nickel, and heating rate on the formation of whiskers was studied. Potassium was found to be an essential constituent for whisker formation. Nickel acts as a catalyst for TiC whisker formation only in the presence of potassium. The yield of whiskers wa......
Synthesis of Nanosized Copper Powder by an Aqueous Route
Tập 7 - Trang 373-377 - 1999
Nanostructured, crystalline copper powder was produced at ambient temperature by aqueous reduction of a copper salt by sodium borohydride. Conditions were optimized to produce boron-free copper powder with an average particle diameter of 200 nm, surface area of 5.48 m * m/g, and oxygent content of 0.155%. The effects of different experimental conditions on average particle size of the powder were ......
Reproducibility of the Synthesis and Processing of Nanostructured Material Properties
Tập 6 - Trang 133-146 - 1998
The reproducibility or variance in the properties of nanostructured milled iron and iron alloy powders and nanostructured compacts was determined and characterized. To date, all too often the characterization of nanostructured materials has been limited to examination of one or two samples, from which it is impossible to determine the reproducibility of the reported values. In this study, multiple......
Synthesis and Characterization of a Free-Standing, One-Dimensional, Al-Cu/SiC-Based Functionally Graded Material
Tập 10 - Trang 75-81 - 2002
In this research paper the synthesis of aluminum-copper/silicon carbide–based (Al-Cu/SiC) functionally gradient material using the innovative technique of gradient slurry disintegration and deposition is presented and discussed. Using the gradient slurry disintegration and deposition technique a gradient of SiC was established using an initial weight percentage of 15%. Results of the synthesis wer......
Work Function of PbZrO3
Tập 6 - Trang 335-338 - 1998
This paper reports the results of work function (WF) changes of undoped PbZrO3 during subsequent isothermal oxidation and reduction experiments at 500°C in the p(O2) range between 10 and 2.1 × 104 Pa. The results, obtained during three consecutive runs, indicate that heating at 500°C leads to continuous changes of surface properties resulting in a complex WF vs. time characteristic. The WF changes......
Modelling the Solidification Microstructure Formation of Cobalt Dendritic Alloys
Tập 7 - Trang 41-48 - 1999
In the present work a mathematical model has been developed to explain the microstructure characteristics obtained during the solidification process of dendritic cobalt alloys, under ordinary low cooling rate conditions. The model, taking into account physical aspects such as undercooling, cooling rate, solute diffusion, interfacial energy, and dendrite tip morphology, allowed results to explain t......