Publication: Estudio de la influencia del proceso de molienda de alta energía en derivados carbonosos: propiedades, optimización y aplicaciones
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2008
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2008-07-11
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Abstract
En esta Tesis Doctoral se han estudiado tres áreas perfectamente definidas. En primer lugar se ha realizado un estudio detallado del comportamiento de tres coques de petróleo procedentes de la destilación del petróleo, como son un coque de recarburación, un coque regular y un coque combustible que han sometidos a procesos de molienda de alta energía, estudiándose los cambios estructurales y morfológicos, además de la evaluación de las propiedades tanto físicas como químicas como consecuencia del proceso de molienda. En segundo lugar, se ha evaluado la posibilidad de emplear algunos de los polvos de coque molido como aporte de carbono en aceros pulvimetalúrgicos fabricados según el proceso convencional, aplicándose tanto aceros al carbono como aceros de baja aleación al cromo. El empleo de coque en lugar del tradicional grafito se ha evaluado mediante el estudio de las propiedades físicas y mecánicas de los aceros sinterizados. Asimismo, se han empleado técnicas estadísticas para analizar los resultados. Por último, se ha estudiado la posibilidad de moler conjuntamente coque y boro para su empleo como ánodos de carbono en baterías de ión-litio. Se han empleado técnicas electroquímicas para determinar la capacidad de almacenamiento de energía en las pilas formadas. Esta Tesis Doctoral ha mostrado la molturabilidad de los tres coques de diferente naturaleza química, la influencia del proceso de molienda y la influencia de la estructura de los coques en las propiedades de los coques molidos. Esta Tesis Doctoral ha verificado que estos materiales son válidos para fabricar aceros sinterizados, sustituyendo al grafito como material de aporte carbonoso, y que la molienda conjunta de coque y boro abre una vía para la optimización y mejora de las propiedades electroquímicas como material anódico en las baterías recargables de ión-litio.------------------------------------------------------------------------------------------------------------------------------------------------------------------------
In this PhD Thesis three perfectly delimited areas have been studied. First of all, it has made a detailed study of the milling behaviour of three cokes derived from the destilation of petroleum, such as a C1 coke, a C3 coke and a C4 coke. These cokes have been subjeted to high energy milling processes, studyng the structural and morfological changes, and the evaluation of the physical and chemical properties after the milling process. In the second part, the possibility of using some of the milled coke powders as carbon incorporated to powder metallurgical steels manufactured following the conventional process, focus on carbon or chromium low alloyed steels, has been evaluated. The use of coke instead of the traditional graphite has been evaluated by means of the study of the physical and mechanical properties of the sintered steels. In order to analyze the results, statistical techniques have been used. Finally, the possibility of milling coke and boron together for using as carbon anodes in lithium-ion batteries has been studied. For determinate energy storage capacity, these batteries has been used electrochemical techniques. This PhD Thesis the easinees of milling of the three cokes of different chemical nature, the influence of the milling process and the influence of the cokes structure on the properties of the milled cokes have been evaluated. In addition, the Thesis has confirmed that these materials are adequated to manufacture sintered steels, substituting the graphite as carbon raw material, and the milling of coke and boron together gives a new way in order to optimization and the improvement of the electrochemical properties as new anodic material in the lithiumion rechargeable batteries.
In this PhD Thesis three perfectly delimited areas have been studied. First of all, it has made a detailed study of the milling behaviour of three cokes derived from the destilation of petroleum, such as a C1 coke, a C3 coke and a C4 coke. These cokes have been subjeted to high energy milling processes, studyng the structural and morfological changes, and the evaluation of the physical and chemical properties after the milling process. In the second part, the possibility of using some of the milled coke powders as carbon incorporated to powder metallurgical steels manufactured following the conventional process, focus on carbon or chromium low alloyed steels, has been evaluated. The use of coke instead of the traditional graphite has been evaluated by means of the study of the physical and mechanical properties of the sintered steels. In order to analyze the results, statistical techniques have been used. Finally, the possibility of milling coke and boron together for using as carbon anodes in lithium-ion batteries has been studied. For determinate energy storage capacity, these batteries has been used electrochemical techniques. This PhD Thesis the easinees of milling of the three cokes of different chemical nature, the influence of the milling process and the influence of the cokes structure on the properties of the milled cokes have been evaluated. In addition, the Thesis has confirmed that these materials are adequated to manufacture sintered steels, substituting the graphite as carbon raw material, and the milling of coke and boron together gives a new way in order to optimization and the improvement of the electrochemical properties as new anodic material in the lithiumion rechargeable batteries.
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Pulvimetalurgia, Aceros sinterizados, Coques de petróleo