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A new approach to synthesis Ti2AlC MAX phase using PVD coating and post-laser treatment
Surface & Coatings Technology ( IF 5.4 ) Pub Date : 2020-01-13 , DOI: 10.1016/j.surfcoat.2019.125314
Mahsa Bahiraei , Yousef Mazaheri , Mohsen Sheikhi , Akbar Heidarpour

The Ti2AlC MAX phase was synthesized on the Ti-6Al-4V alloy substrate using a novel technique. In contrary to the most techniques used for synthesizing the MAX phases in which the metal powders were the main raw material, the metal powder wasn't used in this procedure. The Ti-6Al-4V plates were carbon coated by physical vapor deposition (PVD), and then the Nd: YAG and diode lasers were irradiated on the coated samples. The laser process was performed at different variables including the power, scan speed, and focal position of the laser. The laser-treated samples were investigated by optical microscopy, X-Ray diffraction (XRD), and field-emission scanning electron microscopy (FESEM) equipped with energy disperse spectroscopy (EDS). In addition to the other phases such as titanium carbide (TiC) and titanium nitride (TiN), the Ti2AlC MAX phase was also detected by the XRD analysis. The hardness of the coated irradiated samples was nearly 2.5 to 4.5 times higher than the substrate. The wear and friction performances of the samples was evaluated using a reciprocal wear device in which the AISI 52100 steel with the hardness of 63 HRC was used as the counterpart. The wear rate of the laser-treated sample decreased about 81% with respect to the Ti-6Al-4V substrate. The average friction coefficient reduced nearly 66% after the laser treating of the Ti-6Al-4V sample. The SEM images of the worn surfaces and debris were used to deduce the wear mechanisms. The abrasive wear was the dominant wear mechanism.



中文翻译:

PVD涂层和激光后处理合成Ti 2 AlC MAX相的新方法

2使用一种新技术,在Ti-6Al-4V合金基底上合成了AlC MAX相。与大多数用于合成以金属粉末为主要原料的MAX相的技术相反,此过程中未使用金属粉末。通过物理气相沉积(PVD)对Ti-6Al-4V板进行碳涂覆,然后将Nd:YAG和二极管激光器照射在涂覆的样品上。激光加工是在不同的变量下执行的,这些变量包括激光的功率,扫描速度和焦点位置。通过光学显微镜,X射线衍射(XRD)和配备能量分散光谱仪(EDS)的场发射扫描电子显微镜(FESEM)研究了经过激光处理的样品。除碳化钛(TiC)和氮化钛(TiN)等其他相外,Ti 2XRD分析也检测到AlC MAX相。涂覆的辐照样品的硬度比基材高近2.5至4.5倍。使用往复磨损装置评估样品的磨损和摩擦性能,其中使用硬度为63 HRC的AISI 52100钢作为对应材料。相对于Ti-6Al-4V基板,激光处理样品的磨损率降低了约81%。在对Ti-6Al-4V样品进行激光处理后,平均摩擦系数降低了近66%。磨损表面和碎屑的SEM图像被用来推断磨损机理。磨料磨损是主要的磨损机制。

更新日期:2020-01-13
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