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 Almerı´a)
Author:
Rodrı´guez Jose´1, Martı´nez Diego1, Rosa Luı´s Guerra2, Fernandes Jorge Cruz2, Amaral Pedro Miguel2, Shohoji Nobumitsu3
Affiliation:
1. Plataforma Solar de Almerı´a, Centro Europeo de Ensayos de Energı´a Solar, Centro de Investigaciones Energeticas Medioambientales y Tecnologicas P.O. Box 22, 04200 Tabernas, Spain 2. Instituto Superior Te´cnico, Departamento de Engenharia de Materiais Av. Rovisco Pais, 1049-001 Lisboa Portugal 3. Instituto Nacional de Engenharia e Tecnologia Industrial, Departamento de Materiais e Tecnologias de Produc¸a˜o Estrada do Pac¸o do Lumiar, 1649-038 Lisboa Portugal
Abstract
During the course of our recent series of solar carbide and carbonitride synthesis work for d-group transition elements (Ti,Zr;V,Nb,Ta;Cr,Mo,W), we detected several intriguing evidences apparently indicative of involvement of photochemical effects in some reactions under solar radiation. 1) Acceleration of graphitization of amorphous carbon during carburization of W under solar radiation. 2) Promoted formation of high temperature mono-carbide phase of Mo under solar radiation at a temperature lower than the one indicated in equilibrium phase diagram. 3) Formation of sub-carbide Ta2C besides mono-carbide TaC in the carburization of Ta with amorphous carbon under solar radiation. Only mono-carbide TaC formed by the carburization of Ta with graphite under solar radiation in accordance with the equilibrium phase diagram. These features were already published individually elsewhere. This article is the brief summary of the reported facts in our earlier publications. Although the results so-far-obtained are rather primitive and still lacking quantitative characterization, there seems to be no doubt that solar materials processing would open new routes for unique products which cannot be prepared through traditional industrial manufacturing processes.
Publisher
ASME International
Subject
Energy Engineering and Power Technology,Renewable Energy, Sustainability and the Environment
Reference29 articles.
1. Cruz Fernandes, J., Guerra Rosa, L., Martı´nez, D., Rodrı´guez, J., and Shohoji, N., 1998,“Influence of Gas Environment on Synthesis of Silicon Carbide through Reaction between Silicon and Amorphous Carbon in a Solar Furnace at P.S.A. (Plataforma Solar de Almerı´a),” J. Ceram. Soc. Jpn., 106, pp. 839–841. 2. Martı´nez, D., Rodrı´guez, J., Guerra Rosa, L., Cruz Fernandes, J., and Shohoji, N., 1999, “Influence of Gas Environment on Synthesis of Silicon Carbide and Some Carbides and Carbonitrides of d-group Transition Metals through Reaction between Metal Powders and Amorphous Carbon Powders in a Solar Furnace at P.S.A. (Plataforma Solar de Almerı´a),” J. Phys. IV, 9, Proceedings 3, pp. 405–410. 3. Shohoji, N., Guerra Rosa, L., Cruz Fernandes, J., Martı´nez, D., and Rodrı´guez, J., 1999, “Catalytic Acceleration of Graphitization of Amorphous Carbonduring Synthesis of Tungsten Carbide from Tungsten and Excess Amorphous Carbon in a Solar Furnace,” Mater. Chem. Phys., 58, pp. 172–176. 4. Guerra Rosa, L., Cruz Fernandes, J., Amaral, P. M., Martı´nez, D., Rodrı´guez, J., and Shohoji, N., 1999, “Photochemically Promoted Formation of Higher Carbide of Molybdenum through Reaction between Metallic Molybdenum Powders and Graphite Powders in a Solar Furnace,” Int. J. Refract. Met. Hard Mater., 17, pp. 351–356. 5. Shohoji, N., Amaral, P. M., Cruz Fernandes, J., Guerra Rosa, L., Martı´nez, D., and Rodrı´guez, J., 2000, “Catalytic Graphitization of Amorphous Carbon during Solar Carbide Synthesis of VI a Group Metals (Cr, Mo, and W),” Mater. Trans., JIM, 41, pp. 246–249.
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