Copper–alumina composites of the interpenetrating networks type are interesting materials for many applications because of their properties. On the base of preliminary investigations and practical works, in order to obtain a material with high resistance to friction wear as well as good dissipation of heat generated during work, it was decided that a developed material would be prepared on the base of the Cu–Al₂O₃ composite, with a graded composition. In this paper, we present the developed method of manufacturing dense copper–alumina FGMs, using ceramic preform with a graded porosity infiltrated with molten copper. The article also presents the full characterization of the obtained materials and mainly the impact of microstructure on the useful properties. The produced gradient material of a Cu–Al₂O₃ brake disk underwent tribological tests under conditions resembling real conditions. These disks also went through a series of abrasive wear trials at different operation stages. In comparison with the reference material (i.e., grey cast iron), the obtained gradient materials are characterized by a lower degree of wear when retaining a similar coefficient of friction value due to the ceramic phase addition. Additionally, it was found that using the copper-based gradient material guarantees faster heat dissipation from the contact area.

中文翻译：

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基于铜铝复合材料的FGM，用于制动盘应用

互穿网络类型的铜铝复合材料由于其性能而成为许多应用中令人感兴趣的材料。在初步研究和实际工作的基础上，为了获得一种具有高耐摩擦磨损性和良好散热性能的材料，决定在Cu–铝₂ O ₃复合材料，具有渐变的成分。在本文中，我们介绍了一种制造致密铜-氧化铝FGM的先进方法，该方法使用了具有渗透到熔融铜中的分级孔隙率的陶瓷预成型坯。该文章还介绍了所得材料的完整特性，主要介绍了微观结构对有用性能的影响。产生的Cu–Al ₂ O ₃梯度材料制动盘在类似于真实条件的条件下进行了摩擦测试。这些圆盘还在不同的操作阶段经历了一系列磨料磨损试验。与参比材料（即灰口铸铁）相比，所获得的梯度材料的特征在于，由于添加了陶瓷相，在保持相似的摩擦系数值时，磨损程度较低。另外，发现使用铜基梯度材料可确保从接触区域更快地散热。