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首页> 外文期刊>Journal of Materials Engineering and Performance >A Comparative Study of Thermal Conductivity and Tribological Behavior of Squeeze Cast A359/AlN and A359/SiC Composites
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A Comparative Study of Thermal Conductivity and Tribological Behavior of Squeeze Cast A359/AlN and A359/SiC Composites

机译：挤压铸造A359 / ALN和A359 / SIC复合材料的热导率和摩擦学行为的比较研究

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摘要

A comparative study of thermal and wear behavior of squeeze cast A359 alloy and composites containing 5, 10 and 15 wt.% AlN and SiC particulates was investigated. It was pointed out that A359/AlN composites have a superior thermal conductivity as compared to A359 alloy or even to A359/SiC composites. Composites wear characteristics were achieved by pins-on-disk instrument over a load range of 20-60 N and a sliding speed of 2.75 m/s. Results showed that A359/AlN and A359/SiC composites exhibited higher wear resistance values compared to A359 alloy. Moreover, A359/AlN composites showed superior values of wear resistance than A359/SiC composites at relatively high loads. Friction coefficients and contact surface temperature for A359/AlN specimens decreased as AlN content increased, while they increased for A359/ SiC. Investigations of worn surfaces revealed that A359/AlN composites were covered up by aluminum nitrides and iron oxides, which acted as smooth layers. However, A359/SiC composites were mainly covered only by iron oxides. The superior thermal conductivity and the significant wear resistance of the developed A359/AlN composites provided a high durable material suitable for industrial applications.
机译：对挤压铸造A359合金和含有5、10和15 wt.%AlN和SiC颗粒的复合材料的热性能和磨损性能进行了对比研究。指出与A359合金甚至A359/SiC复合材料相比，A359/AlN复合材料具有优越的导热性能。在载荷范围为20-60 N、滑动速度为2.75 m/s的情况下，通过销盘式磨损仪获得了复合材料的磨损特性。结果表明，与A359合金相比，A359/AlN和A359/SiC复合材料具有更高的耐磨性。此外，在相对较高的载荷下，A359/AlN复合材料比A359/SiC复合材料表现出更好的耐磨性。A359/AlN试样的摩擦系数和接触表面温度随AlN含量的增加而降低，而A359/SiC试样的摩擦系数和接触表面温度随AlN含量的增加而升高。对磨损表面的研究表明，A359/AlN复合材料被氮化铝和氧化铁覆盖，形成光滑层。然而，A359/SiC复合材料主要由氧化铁覆盖。A359/AlN复合材料优越的导热性和显著的耐磨性为工业应用提供了一种高耐久性材料。

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