Photochemical Effects in Carbide Synthesis of d-group Transition Metals (Ti, Zr; V, Nb, Ta; Cr, Mo, W) in a Solar Furnace at PSA (Plataforma Solar de Almerı́a)

[+] Author and Article Information
José Rodrı́guez, Diego Martı́nez

Plataforma Solar de Almerı́a, Centro Europeo de Ensayos de Energı́a Solar, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas P.O. Box 22, 04200 Tabernas, Spain

Luı́s Guerra Rosa, Jorge Cruz Fernandes, Pedro Miguel Amaral

Instituto Superior Técnico, Departamento de Engenharia de Materiais Av. Rovisco Pais, 1049-001 Lisboa Portugal

Nobumitsu Shohoji

Instituto Nacional de Engenharia e Tecnologia Industrial, Departamento de Materiais e Tecnologias de Produção Estrada do Paço do Lumiar, 1649-038 Lisboa Portugale-mail: Nobumitsu.Shohoji@mail.ineti.pt

J. Sol. Energy Eng 123(2), 109-116 (Nov 01, 2000) (8 pages) doi:10.1115/1.1350565 History: Received April 01, 2000; Revised November 01, 2000
Copyright © 2001 by ASME
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Schematic solar furnace configuration at PSA. All solar beam reflecting components are made of silver.
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Schematic cross sectional appearance of reaction chamber (MINIVAC) (reproduced from 1)
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Schematic experimental set-up in the graphite crucible installed in atmosphere-controllable chamber (MiniVac) for solar irradiation (reproduced from 4): A) alumina sheath for thermocouple protection, B) graphite support, C) secondary alumina support, D) thermocouple, and E) cement glue
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Heating/cooling patterns in the solar furnace (a) and in the laboratory electric furnace (b) (reproduced from 7): Heating rate (HR) in the solar furnace was 20°C/min and the cooling rate (CR) immediately after the solar beam cut down about 20°C/min while HR in the electric furnace 6°C/min and CR immediately after the furnace shut down about 6°C/min
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XRD (X-ray diffraction) patterns of the reaction products from VIa-group metals (Cr, Mo and W) mixed with excess free carbon (G or aC) in Ar atmosphere under solar radiation for 30 min (reproduced from 5)
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XRD patterns obtained for Si specimens (reproduced from 1): A) 1620°C for 30 min in Ar at 1.5 bar, B) 1650°C for 30 min in N2 at 2 bar, and C) unreacted reference
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XRD patterns obtained for Ta specimens (reproduced from 7)
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Mo-C equilibrium phase diagram (reproduced from 12)




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