Abstract

Herein, we study the effect of Ti₃SiC₂ on the microstructures and tribological properties of an in situ TiC reinforced Ni(Si, Ti) composites elaborated from Ni and Ti₃SiC₂ MAX phase powders against steel (100Cr6). Pressureless sintering at 1080 °C for 4 h of Ni and Ti₃SiC₂ powders was used to elaborate these composites with 10, 20 and 30 wt.% of Ti₃SiC₂. The microstructures of the composites were investigated by scanning electron microscopy (SEM), x-rays diffraction and Raman spectroscopy. Standard ball-on-disk friction wear tests under different applied loads were conducted on the composites surfaces at room temperature. For the three elaborated composites, Ti₃SiC₂ was totally decomposed and transformed to TiC phase, while the released Si and Ti atoms from Ti₃SiC₂ diffused into Ni matrix forming Ni(Si, Ti) solid solution. As compared with reference (Ni) sinter, the addition of 20 wt.% Ti₃SiC₂ in the Ni matrix improved the hardness by ~ 250%. The addition of Ti₃SiC₂ particles also had a beneficial effect on the tribological performance of these composites against steel. The worn surfaces of the elaborated composites under all applied loads are characterized by the presence of a lubricious Fe₃O₄-αFe₂O₃ tribofilms. The effect of chemical compositions and different applied loads on the wear mechanisms of the three elaborated composites is discussed.

中文翻译：

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Ni和Ti 3 SiC 2粉末制备的原位TiC-Ni（Si，Ti）复合材料的微观结构和摩擦学行为

摘要

本文中，我们研究了Ti ₃ SiC ₂对由Ni和Ti ₃ SiC ₂ MAX相粉末针对钢（100Cr6）制备的原位TiC增强Ni（Si，Ti）复合材料的微观结构和摩擦学性能的影响。使用Ni和Ti ₃ SiC ₂粉末在1080°C下进行4 h的无压烧结来制备含有10、20和30 wt。％的Ti ₃ SiC _2的复合材料。通过扫描电子显微镜（SEM），X射线衍射和拉曼光谱研究了复合材料的微观结构。在室温下，对复合材料表面进行了不同载荷下的标准圆盘摩擦磨损试验。对于这三种精心制作的复合材料，Ti ₃ SiC ₂完全分解并转变为TiC相，而从Ti ₃ SiC ₂释放的Si和Ti原子扩散到Ni基体中，形成Ni（Si，Ti）固溶体。与参比（Ni）烧结相比，在Ni基体中添加20 wt。％Ti ₃ SiC _2可以将硬度提高约250％。Ti ₃ SiC _2的添加颗粒还对这些复合材料的抗钢摩擦性能产生了有益的影响。所有施加的载荷下详尽复合材料的磨损表面由光滑Fe的特征在于存在₃ ö ₄ -αFe ₂ ö ₃摩擦膜。讨论了化学成分和不同施加载荷对三种复合材料的磨损机理的影响。