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Clay raw materials from the Triassic Red Beds (Northern Jaen, Spain) for making ceramic construction materials
The suitability of Triassic Red Beds from northern Jaén in the production of structural clay products has been evaluated. These materials have high phyllosilicate contents (36-69%), although some samples are enriched in quartz (
Metallic materials in solid oxide fuel cells
Fe-Cr alloys with variations in chromium content and additions of different elements were studied for potential application in intermediate temperature Solid Oxide Fuel Cell (SOFC). Recently, a new type of FeCrMn(Ti/La) based ferritic steels has been developed to be used as construction material for SOFC interconnects…
Alloy degradation under oxidizing-sulfidizing conditions at elevated temperatures
Exposure of high-temperature alloys to a low-P O2 oxidizing-sulfidizing environment above about 550 °C is often characterized by an initial period of protective oxidation followed by more rapid corrosion. This paper will provide a brief overview of alloy corrosion in oxidizing-sulfidizing atmospheres, with specific co…
The role of alloy composition, environment and stresses for the oxidation resistance of modern 9% Cr steels for fossil power stations
In recent years a new group of ferritic-martensitic chromium steels for the use in fossil power stations has been developed with chromium contents between 9 and 12%. Typical representatives of these steels are P91, E911 and Nf616, which are nowadays widely used in the more advanced power plants. In the development pha…
Degradation of some ceria electrolytes under hydrogen contact nearby anode in solid oxide fuel cells (SOFCs)
This work is concerned with thermodynamic analysis of the stability of some ceria electrolytes under contact with hydrogen gas nearby anode in fuel cells. It was considered the following types of ceria-electrolytes: pure ceria, strontium-doped ceria, calcium-doped ceria and calcium-bismuth-doped ceria. The equilibrium…
TABLE OF CONTENTS
Tribological Studies of Bronze Filled PTFE Polymer
Editorial
Investigations on Polyvinyl Chloride - Carbon Black Blends
Solid particle erosion of plasma sprayed ceramic coatings
Thermal spraying allows the production of overlay protective coatings of a great variety of materials, almost without limitations as to its components, phases and constituents on a range of substrates. Wear and corrosion resistant coatings account for significant utilization of thermal spray processes. Besides being a…
Oxidation - Nitridation of Ni-Cr-Al alloys
A series of alloys containing 24-36 wt pct Cr and 13.5 - 25.0 wt pct Al was reacted with air at 1100°C for 260 h. The products of isothermal reaction were scales of a-Al2O3 plus small amounts of Cr2O3. These grew according to parabolic kinetics, interrupted by episodic weight losses caused by partial spallation. No ni…
Congresos, Seminarios y Cursos
Characterization of the materials of the ceiling that covers the Mayor Sacristhi of Seville's Cathedral
In this article we expose the technics used to characterize the materials of the ceiling that covers the Mayor sacristy of Seville's Cathedral and the causes of the loosening of mortar and stone fragments, we also expose some ways to overcome this fact.
Rupestral paintings of the "La Graja" cave. Pigment characterization and digital image analysis
The present study is part of a wide-ranging research on a group of archaeological sites located in Andalucía (Spain) whose main aim was a better understanding of these sites within a geomorphological, biological and climatic context. This specific investigation concerns the alteration processes affecting the rupestral…
Reactivity of laser-cleaned stones to a SO2 ageing test
In order to study the reaction or susceptibility of Nd:YAG laser cleaned stones to polluted atmospheres, several types of stone, both cemented (limestone) and crystalline (marble, granite), were exposed to an atmosphere having simulated SO2 pollution. The subsequent effects on the specimens were assessed for variation…
Constructive applications of composite gypsum reinforced with Typha Latifolia fibres
The present research analyses the possibility to reinforce gypsum using enea fibres (Typha Latifolia) creating a compound material in wich the fibres contribute to increase mechanical resistance, producing as well a reduction of the weight and a possible regulation of the set time.
Duplex Al-based thermal spray coatings for corrosion protection in high temperature refinery applications
The application of thermal spray coatings has been effective in preventing corrosion of steel and iron products. It has been used in a wide range of applications spreading from the petroleum to the food industry. In this work, the performance and effectiveness of a two-layered aluminum-based thermal spray coating appl…