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A Comparative Study of Adhesively Bonded Composite Patch
Stress and integrity analysis of steam superheater tubes of a high pressure boiler
Sources that can lead to deterioration of steam superheater tubes of a high pressure boiler were studied by a stress analysis, focused on internal pressure and temperature experienced by the material at real operating conditions. Loss of flame control, internal deposits and unexpected peak charge are factors that gene…
Rare earth oxide coatings to decrease high temperature degradation of chromia forming alloys
The addition of small quantities of reactive elements such as rare earths (RE) to chromia or alumina forming alloys improves the high temperature oxidation resistance. Traditionally, these elements are alloying additions or are added as oxides to form a dispersion. The alloys can also be coated with RE oxides. Several…
High temperature corrosion issues in energy-related systems
The large majority of electric power that is generated world-wide involves heat engines of one kind or another. The significant exceptions are hydroelectric generation; wind; and photovoltaics. The thermal sources for the heat engines include: fossil fuels, nuclear fission, biomass, geothermal sources, and solar radia…
Corrosion penetration monitoring of advanced ceramics in hot aqueous fluids
Advanced ceramics are considered as components in energy related systems, because they are known to be strong, wear and corrosion resistant in many environments, even at temperatures well exceeding 1000 °C. However, the presence of additives or impurities in important ceramics, for example those based on Silicon Nitri…
Niobium and chromium rich coatings tailored by laser alloying: XRD analysis at high temperatures
Laser treatment technologies have been widely used to modify superficial layers of different materials. In this work we prepare Nb and Cr rich coatings according to laser alloying technique using cast iron as substrate material. Nb and Cr are intensive used in order to overcome challenges like good chemical and mechan…
Stress and adhesion of chromia-rich scales on ferritic stainless steels in relation with spallation
The relation between chromia scale spallation during oxidation or cooling down of ferritic stainless steels is generally discussed in terms of mechanical stresses induced by volume changes or differential thermal expansion. In the present paper, growth and thermal stress measurements in scales grown on different ferri…
Corrosion resistance of a steel under an oxidizing atmosphere in a fluid catalytic cracking regenerator
In the present work, the corrosion resistance of an ASTM A 387 G11 steel was evaluated under two conditions: an oxidizing atmosphere in a fluid catalytic cracking regenerator of a petroleum processing unit and a simulated atmosphere in the laboratory, at temperatures of 650 °C and 700 °C. The characterization of the p…
Editorial
High temperature degradation by erosion-corrosion in bubbling fluidized bed combustors
Heat-exchanger tubes in fluidized bed combustors (FBCs) often suffer material loss due to combined corrosion and erosion. Most severe damage is believed to be caused by the impact of dense packets of bed material on the lower parts of the tubes. In order to understand this phenomenon, a unique laboratory test rig at B…
Role of alloying elements and carbides in the chlorine-induced corrosion of steels and alloys
The high temperature corrosion of steels and Ni-base alloys in oxidizing and chloridizing environments is of practical interest in relation to problems in waste incineration plants and power plants using Cl containing fuels. The behaviour of the most important alloying elements Fe, Cr, Ni, Mo, Mn, Si, Al upon corrosio…
High temperature corrosion in gasifiers
Several commercial scale coal gasification combined cycle power plants have been built and successfully operated during the last 5-10 years. Supporting research on materials of construction has been carried out for the last 20 years by EPRI and others. Emphasis was on metallic alloys for heat exchangers and other comp…
Effect of Process Variables and Feeder Yarn Properties on the Properties of Core-and-Effect and Normal Air-Jet Textured Yarns
Tensile and dimensional properties of air-jet textured yarns are affected by air pressure, overfeed, and different overfeed levels of the core and effect components. There is considerable deterioration in the tenacity and modulus of yarns after texturing. Yarn breaking extension mostly decreases after texturing. Yarns…
On the computation of the nijboer-zernike aberration integrals at arbitrary defocus
We present a new computation scheme for the integral expressions describing the contributions of single aberrations to the diffraction integral in the context of an extended Nijboer-Zernike approach. Such a scheme, in the form of a power series involving the defocus parameter with coefficients given explicitly in term…
Nanostructured CdS:O film: preparation, properties, and application
In this paper, we report on a novel material: nanostructured CdS:O film prepared at room temperature by rf sputtering, and its application in CdTe solar cells. The CdS:O film has a higher optical bandgap (2.5–3.1 eV) than the poly-CdS film and a nanostructure; the bandgap increases with an increase of oxygen content (…
Characterization and selection of mortars in the restoration of the Kings Portal (Benavente, Zamora)
In the selection of materials required by any work on Architectural Heritage, a series of special requirements must be borne in mind which are essential to guarantee the application of the repairs. In this work the guidelines and basic criteria for the selection of repair mortars that have led to the design of mortars…
Evaluation of concrete mechanical strength through porosity
The increasing on voids or pores in any material - if the rest of characteristics remains equal -always causes a decrease in their mechanical strength since the ratio volume/resistant mass is lower Following all these fact a well known conclusion rises: there is a relationship between compacity/porosity and mechanical…
Role of wave interaction of wires and split-ring resonators for the losses in a left-handed composite
In this work the analytical model explaining the losses in the known two-phase lattice of D. Smith, S. Schultz and R. Shelby representing a uniaxial variant of left-handed medium (LHM) at microwaves is presented. The role of electromagnetic interaction between split-ring resonators (SRRs) and straight wires leading to…
Investigation of the incremental response of soils using a discrete element model
The incremental stress-strain relation of dense packings of polygons is investigated here by using molecular dynamics simulations. The comparison of the simulation results to the continuous theories is performed using explicit expressions for the averaged stress and strain over a representative volume element. The dis…