scholarly journals LOW-RESISTANCE Bi/Pb CERAMICS CONTAINING Ts = 295К-315K PHASES SYNTHESIZED IN A SOLAR FURNACE (PARKENT)

2020 ◽  
Vol 2020 (3) ◽  
pp. 20-24
Keyword(s):  
Solar Energy ◽  
Peritectic Reaction ◽  
Heterogeneous System ◽  
Mutual Influence ◽  
Solar Furnace ◽  
Low Resistance ◽  
Superconducting Phases ◽  
Superconducting Ceramics ◽  
Methods Of Synthesis ◽  
Layered Ceramics

The aim of this work is to obtain bulk textured superconducting ceramics based on glass-crystalline precursors of the Bi1.7Pb0.3Sr2Ca(n-1)CunOy (n=5-9) series. Technologies for obtaining superconducting materials are presented. The advantages of melt methods and “Super Fast Aloys Quenching–T” technology is shown. Compositions, methods of synthesis and study of properties of precursors and ceramics obtained by solar energy are presented. The interrelation of the morphology of glass-crystalline precursors and superconducting ceramics based on them is revealed. It is shown that nano-sized nuclei are the basis on which superconducting phases with Ts = 295-315K are formed as a result of the peritectic reaction. The mechanism of conduction in nanostructured layered ceramics containing higher superconducting phases is proposed. The contribution to the conductivity of low-resistance ceramics is assumed due to the mutual influence of Bi / Pb homologous phases, which represent a “quasi” heterogeneous system by analogy with the mechanism proposed by Rashba for heterophase semiconductors.

scholarly journals EFFECT OF LIGHT ON THE RESISTANCE OF Bi/Pb SUPERCONDUCTORS SYNTHESIZED BY SOLAR ENERGY

2021 ◽  
pp. 8-11
Keyword(s):  
Solar Energy ◽  
White Light ◽  
Room Temperature ◽  
Superconducting Phases ◽  
Ceramic Samples ◽  
Superconducting Ceramics ◽  
Effect Of Light

The aim of the work is to expand the capabilities of solar technologies and areas of practical use of superconductors. The effect of white light on the interaction of superconducting ceramics with a magnet at room temperature was investigated. It has been established that the magnet is “ejected” by ceramic samples of nominal Bi1,7Pb0,3Sr2Ca(n-1)CunOy, (n = 5-20) under the influence of white light and there is no effect in the dark. The resistance of Bi/Pb superconducting ceramics is reduced by exposure to light compared to resistance in the dark. The resistance of ceramics containing higher superconducting higher superconducting phases Tc = 267-295 K is lower in comparison with “nitrogen” ceramics Tc = 110-120 K

Surface Hardening of Steel Using Highly Concentrated Solar Energy Process

1999 ◽  
Vol 121 (1) ◽  
pp. 36-39 ◽  
Author(s):  
A. Ferriere ◽  
C. Faillat ◽  
S. Galasso ◽  
L. Barrallier ◽  
J-E. Masse
Keyword(s):  
Solar Energy ◽  
Surface Hardening ◽  
Solar Furnace ◽  
Small Scale ◽  
Single Spot ◽  
Energy Process ◽  
Concentrated Solar Energy ◽  
Compressive Stresses ◽  
Hardening Process ◽  
Continuous Scanning

A recent French contribution in the field of surface hardening of steel using concentrated solar energy is presented. Single spot and continuous scanning processes have been investigated in a small-scale solar furnace. Hardened regions of 0.5–1.5 mm in thickness have been obtained on specimens of carbon steel, resulting from the transformation hardening process. Compressive stresses are induced in the thermally affected layer, without tensile peak in the bulk.

scholarly journals Heat Treatment of Steel 1.1730 with Concentrated Solar Energy

2019 ◽  
Vol 56 (1) ◽  
pp. 261-270
Author(s):  
Maria Stoicanescu ◽  
Aurel Crisan ◽  
Ioan Milosan ◽  
Mihai Alin Pop ◽  
Jose Rodriguez Garcia ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Solar Radiation ◽  
Solar Energy ◽  
Vertical Axis ◽  
Solar Furnace ◽  
Solid Base ◽  
Heating And Cooling ◽  
Concentrated Solar Energy ◽  
Wide Range ◽  
The Impact

This paper presents and discusses research conducted with the purpose of developing the use of solar energy in the heat treatment of steels. For this, a vertical axis solar furnace called at Plataforma Solar de Almeria was adapted such as to allow control of the heating and cooling processes of samples made from 1.1730 steel. Thus temperature variation in pre-set points of the heated samples could be monitored in correlation with the working parameters: the level of solar radiation and implicitly the energy used the conditions of sample exposed to solar radiation, and the various protections and cooling mediums.The recorded data allowed establishing the types of treatments applied for certain working conditions. The distribution of hardness, as the representative feature resulting from heat treatment, was analysed on all sides of the treated samples. In correlation with the time-temperature-transformation diagram of 1.1730 steel, the measured values confirmed the possibility of using solar energy in all types of heat treatment applied to this steel. In parallel the efficiency of using solar energy was analysed in comparison to the energy obtained by burning methane gas for the heat treatment for the same set of samples. The analysis considered energy consumption, productivity and the impact on the environment. Thanks to various data obtained through developed experiences, which cover a wide range of thermic treatments applied steels 1.1730 model, we can certainly state that this can be a solid base in using solar energy in applications of thermic treatment at a high industrial level.

scholarly journals Evaluation of Heat-Treated AISI 316 Stainless Steel in Solar Furnaces to Be Used as Possible Implant Material

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 581
Author(s):  
Ioan Milosan ◽  
Monica Florescu ◽  
Daniel Cristea ◽  
Ionelia Voiculescu ◽  
Mihai Alin Pop ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Solar Energy ◽  
Heat Treatments ◽  
Solar Furnace ◽  
316 Stainless Steel ◽  
Heat Treated ◽  
Aisi 316 Stainless Steel ◽  
Aisi 316

The appropriate selection of implant materials is very important for the long-term success of the implants. A modified composition of AISI 316 stainless steel was treated using solar energy in a vertical axis solar furnace and it was subjected to a hyper-hardening treatment at a 1050 °C austenitizing temperature with a rapid cooling in cold water followed by three variants of tempering (150, 250, and 350 °C). After the heat treatment, the samples were analyzed in terms of hardness, microstructure (performed by scanning electron microscopy), and corrosion resistance. The electrochemical measurements were performed by potentiodynamic and electrochemical impedance spectroscopy in liquids that simulate biological fluids (NaCl 0.9% and Ringer’s solution). Different corrosion behaviors according to the heat treatment type have been observed and a passivation layer has formed on some of the heat-treated samples. The samples, heat-treated by immersion quenching, exhibit a significantly improved pitting corrosion resistance. The subsequent heat treatments, like tempering at 350 °C after quenching, also promote low corrosion rates. The heat treatments performed using solar energy applied on stainless steel can lead to good corrosion behavior and can be recommended as unconventional thermal processing of biocompatible materials.

Multifunctional Polymer Composites for "Intellectual" Structures: Present State, Problems, Future

2008 ◽  
Vol 47-50 ◽  
pp. 81-84
Author(s):  
Anatoliy T. Ponomarenko ◽  
Oleg Figovsky ◽  
Vitaliy G. Shevchenko
Keyword(s):  
Physical Properties ◽  
Heterogeneous Systems ◽  
Hierarchical Structures ◽  
Ceramic Matrix Composites ◽  
Matrix Composites ◽  
Technological Parameters ◽  
Inhomogeneous Materials ◽  
Intelligent Structures ◽  
Superconducting Ceramics ◽  
Methods Of Synthesis

Strategy of the synthesis of multifunctional materials is developed on the basis of physical properties of composites, composition of fillers, the type of polymer matrix and distribution of ingredients in composite. Each of these factors is displayed in material in different extent depending on technological parameters of processing, and also properties and interaction of fillers in particular conditions. In homogeneous and, in particular in heterogeneous systems, such as metals and alloys, ferro - and ferrimagnetics, ferroelectrics, ferroelectromagnetics, polymer and ceramic matrix composites, high-temperature superconducting ceramics, etc. It is always possible to outline various types of hierarchy. Investigation of the effect of hierarchical structures on physical properties and the nature of interaction of various internal fields in inhomogeneous materials is inseparably linked with the development of methods of synthesis of new smart and intelligent structures.

Rapid High Temperature Solar Thermal Biomass Gasification in a Prototype Cavity Reactor

2010 ◽  
Vol 132 (1) ◽  
Author(s):  
Paul Lichty ◽  
Christopher Perkins ◽  
Bryan Woodruff ◽  
Carl Bingham ◽  
Alan Weimer
Keyword(s):  
High Temperature ◽  
Solar Energy ◽  
Gas Flow ◽  
Biomass Conversion ◽  
Biomass Gasification ◽  
Solar Furnace ◽  
Concentrated Solar Energy ◽  
Product Stream ◽  
Tar Reduction ◽  
Composition Ratios

High temperature biomass gasification has been performed in a prototype concentrated solar reactor. Gasification of biomass at high temperatures has many advantages compared with historical methods of producing fuels. Enhancements in overall conversion, product composition ratios, and tar reduction are achievable at temperatures greater than 1000°C. Furthermore, the utilization of concentrated solar energy to drive these reactions eliminates the need to consume a portion of the product stream for heating and some of the solar energy is stored as chemical energy in the product stream. Experiments to determine the effects of temperature, gas flow rate, and feed type were conducted at the high flux solar furnace at the National Renewable Energy Laboratory, Golden, CO. These experiments were conducted in a reflective cavity multitube prototype reactor. Biomass type was found to be the only significant factor within a 95% confidence interval. Biomass conversion as high as 68% was achieved on sun. Construction and design considerations of the prototype reactor are discussed as well as initial performance results.

A Free and Open Source Monte Carlo Ray Tracing Program for Concentrating Solar Energy Research

2010 ◽  
Author(s):  
Jo¨rg Petrasch
Keyword(s):  
Monte Carlo ◽  
Solar Energy ◽  
Open Source ◽  
Ray Tracing ◽  
Modular Design ◽  
Numerical Models ◽  
Solar Furnace ◽  
High Flux ◽  
Energy Research ◽  
Solar Simulator

A free and open source Monte Carlo ray-tracing program for concentrating solar energy research and development is presented. The program uses non energy partitioning Monte Carlo methods to model radiative exchange between arbitrarily arranged surfaces. Surface models include concentrating geometries, such as spherical, parabolic, and elliptical concentrators as well as compound parabolic concentrators. The program’s modular design allows implementation of additional surface and source models. The program has been thoroughly tested and experimentally validated. It has been used to model several concentrating devices including PSI’s high flux solar furnace and ETH’s high flux solar simulator. Furthermore, it has been used to design PSI’s high flux solar simulator and UFL’s high flux solar simulator. The code is particularly suited to provide radiative boundary conditions for numerical models of high temperature solar receivers and solar thermochemical reactors.

Phase composition and properties of superconducting ceramics based on Bi1.7Pb0.3Sr2Ca2Cu3O y precursors fabricated by melt quenching in a solar furnace

2009 ◽  
Vol 54 (6) ◽  
pp. 860-864 ◽  
Author(s):  
D. D. Gulamova ◽  
D. E. Uskenbaev ◽  
G. Fantozzi ◽  
J. G. Chigvinadze ◽  
O. V. Magradze
Keyword(s):  
Phase Composition ◽  
Solar Furnace ◽  
Melt Quenching ◽  
Superconducting Ceramics
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