Journal of Materials Synthesis and Processing
1573-4870
1064-7562
Cơ quản chủ quản: N/A
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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......
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......
Effect of Segregation on the Heterogeneous Kinetics at the Oxygen/Zirconia Interface
Tập 6 - Trang 401-405 - 1998
This paper considers the effect of the segregation-induced concentration gradients and related electric fields on the transport across the oxygen/zirconia interface. Specifically, this paper considers yttrium segregation in yttria-stabilized zirconia and its effect on the formation of concentration gradient in the interface layer.
Self-Propagating High-Temperature Synthesis of Functionally Graded PVD Targets with a Ceramic Working Layer of TiB2-TiN or Ti5Si3-TiN
Tập 10 - Trang 319-330 - 2002
Two- and three-layer functionally graded PVD targets with a “working” layer (sputtering surface) based on TiN-TiB2 or TiN-Ti5Si3 formation via the technology of forced SHS compaction were considered. It was shown that rather wide (up to 1 mm) transition diffusional zones providing firm adhesion of the layers were formed between the working, intermediate, and third layers. The compositions TiN + Ti......
Sintering of Mullite–Zirconia Composite Powder Prepared by Ultrasonic Spray Pyrolysis Technique
Tập 6 - Trang 221-225 - 1998
Sinterabilities of mullite (3Al2O3·2SiO2–zirconia (ZrO2)composite powders prepared by ultrasonic spray pyrolysis techniques (USPTs) were examined. Starting mullite powders containing ∼18.5 mol% (∼15.0 vol%) of zirconia (ZrO2) were prepared by single-nozzle (SN) and double-nozzle (DN) USPT. In SN-USPT, the composite powder was prepared by spray pyrolysis of a water–ethanol solution in an Al(NO3)3–S......
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 ......
Kinetics of Solid State Reactions With Fractal Reagent
Tập 6 - Trang 305-309 - 1998
In the present research we theoretically studied the kinetics of nucleation-limited solid state reactions as influenced by the fractal properties of solid reagent. We consider the model of equal-sized primary particles assembled in fractal cluster. The geometry of such an object is assumed to be described solely by its fractal dimension D and by upper (R
max) and lower (R
min) cutoffs of fractalit......
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......
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......