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Interface Reaction (interface + reaction)

Distribution by Scientific Domains

Polymers and Materials Science	40%

Selected Abstracts

Interface Reactions in Ultrathin Functional Dielectric Films,

ADVANCED ENGINEERING MATERIALS, Issue 4 2009
Dieter Schmeißer
The functional properties of shrunken materials should not be influenced by the reduction of the dimensions. Here, an important consideration is the control of interfacial reactions. We report on synchrotron-based spectroscopic analysis of interfaces of ultrathin functional materials (thickness <10 nm). Examples of high- k oxides, as well as of a ferroelectric polymer, are shown. We demonstrate that our spectroscopic findings are also reflected in the electric properties of thin-film devices. [source]

A new method of potassium chromate production from chromite and KOH-KNO3 -H2O binary submolten salt system

AICHE JOURNAL, Issue 10 2009
Zhi Sun
Abstract A new method of chromate production by applying a new reaction system of KOH-KNO3 -H2O (binary submolten salt system) is proposed and proved feasible. Under conditions of temperature 350°C, KOH-to-chromite ore ratio 2:1, stirring speed 700 rpm, KNO3 -to-chromite ore ratio 0.8:1, oxygen partial pressure 50%, and gas flow 1 L/min, chromium conversion ratio obtained is >98% with reaction time around 300 min. The decomposition of chromite ore in the system is a typical process of solid, liquid,gas reaction, which is coordinately controlled by mass diffusion in product layer and interface reaction. Apparent activation energy of decomposition in the temperature range from 280 to 370°C is 55.63 kJ/mol. During reaction, oxygen dissolves into KOH-KNO3 -H2O melt system first and some cluster, e.g. O, is formed and the mass diffusion coefficient of the cluster was calculated. The system can be considered as both a media of oxygen transportation and reactant donator. Potassium nitrate plays a role of catalyst in the oxidation decomposition reaction of chromite ore and potassium hydroxide. © 2009 American Institute of Chemical Engineers AIChE J, 2009 [source]

Microstructure and Creep Behavior of a Si3N4,SiC Micronanocomposite

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, Issue 2 2009
Monika Ka, iarová
The microstructure and its influence on the creep behaviour of carbon derived Si3N4 -SiC micro/nanocomposite tested in bending at temperatures from 1200° to 1400°C in air has been studied. No phase and microstructure change after creep test implied that material is stable at tested temperature range. After creep test only partial crystallization of glassy intergranular phase has been observed. Creep parameters n close to 1, apparent activation energy around 350 kJ/mol together with TEM observation indicated that the main creep mechanisms is solution precipitation controlled by interface reaction in combination with grain boundary sliding caused by the amorphous intergranular phases present in microstructure. However, the grain boundary sliding is hindered by local SiC particles interlocking neighboring Si3N4 grains. [source]

The effect of alloying elements on the crystallization behaviour and on the properties of galvanized coatings

CRYSTAL RESEARCH AND TECHNOLOGY, Issue 1 2004
G. Vourlias
Abstract The influence of the alloying elements on the interface reactions of zinc coatings during the galvanization process was examined. These reactions affect the crystallization and the structure and properties of the outer layer of the coatings. Depending on the type and concentration of the alloying additions in the galvanizing bath differences were induced in the crystallization process of the Fe-Zn phases. It was found that both the concentration and the distribution of the alloying elements played an important role in the growth of the phases. The formation of the phases and the distribution of the alloying elements in the coatings were determined using X-Ray diffraction (XRD) and Scanning Electron Microscopy (SEM) associated with an Energy Dispersive X-Ray Spectroscopy (EDS) analysis. Finally the behaviour of the galvanized coatings was examined under accelerated salt spray corrosion conditions. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

INCISED SLIPWARE PRODUCTION AT CASTELFIORENTINO (FLORENCE): THE ,VIA BERTINI' SITE (15TH,17TH CENTURIES)*

ARCHAEOMETRY, Issue 5 2008
N. BRIANESE
This study deals with the physical,chemical and mineralogical,petrographic investigations (OM, SEM,EDS, EPMA, ICP, XRpD, Mössbauer and IR) conducted on first- and second-firing wasters belonging to two types of incised slipware (sgraffito), manufactured at Castelfiorentino between the late 15th and the early 17th centuries. Raw materials, colouring agents and firing products were analysed in order to establish the production technology of the ceramic coatings, by means of detailed microtextural and chemical investigations. The pottery underwent two firing processes: the firing of the white slip-coated ceramic body and a further firing after application of the glaze. The homogeneity of the raw materials, white slip and glaze is remarkable, and demonstrates the use of well-established recipes with a constant supply of raw materials from the same places. Highly efficient kiln management during both firings is revealed by body,glaze interface reactions. [source]