The present work focuses on the evaluation of high temperature thermal conductivity and coefficient of thermal expansion of chilled aluminum alloy-corundum particulate composite for automobile piston and cylinder sleeve applications. The alloys selected were LM 13, LM 28, and LM 30 which are the standard alloys used in the automobile sector for the mentioned applications. The reinforcement was corundum, selected because of its high wear resistance and lower thermal conductivity and CTE (Coefficient of Thermal Expansion) properties. By preliminary studies, the reinforcement content was fixed at 9 wt %. The composites were developed using the classical stir casting technique and the samples were selected from three different regions in order to establish the chill effect. For measuring thermal conductivity an experimental setup was prepared exclusively for the purpose since no standard setup was available. However, the CTE of the MMCs (Metal Matrix Composites) were measured using TMA setup. From the analysis it was found that thermal conductivity decreased as one moved away from the chill end. Thus, the specimen at the chill end had the maximum K value while those at the far end had the minimum K value. Of the three composites tested, LM 13 composite (at the far end of the chill) had the least value of K while LM 28 and LM 30 composite almost had the same K values. The morphology of the composite was found to influence the CTE of the composite, since, as the volume fraction and the size of the reinforcements increased in a given specimen the CTE of the specimen decreased due to the ceramic nature of the reinforcement. As seen from the results LM 13 composite had the maximum CTE while LM 28 composite had the minimum CTE values. Among the samples of LM 28, the chill end specimen had the least CTE.


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    Titel :

    Development and thermal property evaluation of chilled aluminum alloy-corundum particulate composite for automotive applications


    Weitere Titelangaben:

    Entwicklung und Bewertung der thermischen Eigenschaften von abgekühltem Aluminiumlegierung-Korundpartikel-Verbundwerkstoff für den Automobilbau


    Beteiligte:
    Shekar, K.S.S. (Autor:in) / Hemanth, J. (Autor:in)


    Erscheinungsdatum :

    2007


    Format / Umfang :

    12 Seiten, 8 Bilder, 6 Tabellen, 13 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch