Abstract

In this work, two copper metal matrix composites (MMCs) reinforced with 20 wt.% of Ti(C,N) or Ti₂AlN particles were studied. The reinforcement particles were synthesized by flash sintering under 2 bar nitrogen atmosphere causing an SHS reaction ignited by electrical current. This reaction led to produce TiC_0.7N_0.3 solid solution for the MMC1 reinforcement and Ti₂AlN, TiN, and Ti₃Al titanium aluminide for the MMC2 reinforcement. Both MMCs were densified by liquid phase sintering. The structural characterization was performed by XRD analysis while the morphology and chemical element distribution of both MMCs were analyzed by SEM and EDS. The structure of the two MMCs was relatively dense and showed good wettability. The mechanical and tribological behavior of MMCs evaluated by nanoindentation and wear testing reveals that the addition of 20 wt.% of reinforcement considerably improves the properties of copper matrix. Indeed, the MMC1 proved to be 3 times harder and 10 times more wear-resistant than the MMC2 composite.

中文翻译：

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Ti-C和Ti-Al粉末混合物在氮气氛中的自燃：作为增强材料在金属基复合材料中的应用

摘要

在这项工作中，研究了用20％（重量）的Ti（C，N）或Ti ₂ AlN颗粒增强的两种铜金属基复合材料（MMC）。通过在2巴的氮气气氛下进行快速烧结来合成增强颗粒，从而通过电流引起SHS反应。该反应导致生成用于MMC1增强材料和Ti ₂ AlN，TiN和Ti _3的TiC _0.7 N _0.3固溶体用于MMC2增强的铝钛铝化物。两种MMC均通过液相烧结致密化。通过XRD分析进行结构表征，同时通过SEM和EDS分析两种MMC的形态和化学元素分布。两个MMC的结构相对致密并且显示出良好的润湿性。通过纳米压痕和磨损测试评估的MMC的机械和摩擦学行为表明，添加20 wt。％的增强材料可显着改善铜基体的性能。实际上，事实证明，MMC1的硬度是MMC2复合材料的3倍，耐磨性是其10倍。