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Revista de Metalurgia
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Efecto del reprensado en las propiedades mecánicas de guías de válvulas fabricadas por pulvimetalurgia

تأثير القمع على الخواص الميكانيكية لأدلة الصمامات المصنعة بواسطة مسحوق المعادن
Authors: Andrés Rodríguez-Spitia; Gustavo Agudelo-Ospina; Juan Galindo; Faber Correa-Ballesteros; Nelly Alba de Sánchez;

Efecto del reprensado en las propiedades mecánicas de guías de válvulas fabricadas por pulvimetalurgia

Abstract

Se determinaron la dureza, pérdida de masa y coeficiente de fricción, de guías de válvulas para motores de combustión interna fabricadas en latón por proceso de pulvimetalurgia, con el objetivo de conocer si cumplen con las exigencias que requiere un motor de combustión interna, utilizando como parámetro comparativo guías de válvulas comerciales de latón producidas por fundición. Se estudió, si las propiedades son homogéneas a lo largo de toda la guía de la válvula y se evaluó el proceso de reprensado que se lleva a cabo de manera adicional en la línea de producción. Se determinaron las durezas Brinell y Vickers; el coeficiente de fricción y la tasa de desgaste (ensayo pin on disk). Mediante microscopía electrónica de barrido y análisis metalográfico, se estudió el mecanismo de desgaste. Se llevó a cabo la determinación de la composición química de las guías y el efecto del reprensado cuantificando la porosidad superficial, mediante el software Analizador de imágenes Pro Plus®. Se puso de manifiesto que las piezas fabricadas por proceso de pulvimetalurgia presentaron valores inferiores en sus propiedades mecánico-tribológicas en comparación con las guías de válvula comerciales. Estos resultados permitirán mejorar las condiciones de fabricación de las guías mediante pulvimetalurgia.

Country
Colombia
Keywords

Effects of Cryogenic Treatment on Material Properties, Repressing effect, Materials Science, FOS: Mechanical engineering, Roughness Parameters, Material - Mechanical properties, Humanities, Dureza, Engineering, Hardness, dureza, Materials Chemistry, coeficiente de fricción, efecto de reprensado, Powder Metallurgy and Compaction Processes, Mining engineering. Metallurgy, Mechanical Engineering, Physics, Materiales - Propiedades mecánicas, TN1-997, FOS: Humanities, Friction coefficient, pérdida de masa, FOS: Philosophy, ethics and religion, Efecto de reprensado, Philosophy, Coeficiente de fricción, Physical Sciences, Pérdida de masa, Surface Texturing for Tribology, Mass loss, Friction Reduction

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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gold