Ercetin Ali, Pimenov Danil Yurievich
Department of Mechanical Engineering, Faculty of Engineering and Architecture, Bingol University, Bingol 12000, Turkey.
Department of Automated Mechanical Engineering, South Ural State University, Lenin Prosp. 76, 454080 Chelyabinsk, Russia.
Materials (Basel). 2021 Aug 25;14(17):4819. doi: 10.3390/ma14174819.
Powder metallurgy (PM) method is one of the most effective methods for the production of composite materials. However, there are obstacles that limit the production of magnesium matrix composites (MgMCs), which are in the category of biodegradable materials, by this method. During the weighing and mixing stages, risky situations can arise, such as the exposure of Mg powders to oxidation. Once this risk is eliminated, new MgMCs can be produced. In this study, a paraffin coating technique was applied to Mg powders and new MgMCs with superior mechanical and corrosion properties were produced using the hot pressing technique. The content of the composites consist of an Mg2Zn matrix alloy and AlO particle reinforcements. After the debinding stage at 300 °C, the sintering process was carried out at 625 °C under 50 MPa pressure for 60 min. Before and after the immersion process in Hank's solution, the surface morphology of the composite specimens was examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) analysis. With the hot pressing technique, composite specimens with a very dense and homogeneous microstructure were obtained. While AlO reinforcement improved the mechanical properties, it was effective in changing the corrosion properties up to a certain extent (2 wt.% AlO). The highest tensile strength value of approximately 191 MPa from the specimen with 8 wt.% AlO. The lowest weight loss and corrosion rate were obtained from the specimen containing 2 wt.% AlO at approximately 9% and 2.5 mm/year, respectively. While the Mg(OH) structure in the microstructure formed a temporary film layer, the apatite structures containing Ca, P, and O exhibited a permanent behavior on the surface, and significantly improved the corrosion resistance.
粉末冶金（PM）法是生产复合材料最有效的方法之一。然而，该方法存在一些障碍，限制了可生物降解材料类别中的镁基复合材料（MgMCs）的生产。在称重和混合阶段，可能会出现危险情况，例如镁粉暴露于氧化环境中。一旦消除这种风险，就可以生产新的MgMCs。在本研究中，对镁粉应用了石蜡涂层技术，并使用热压技术生产出了具有优异机械性能和耐腐蚀性的新型MgMCs。复合材料的成分由Mg2Zn基体合金和AlO颗粒增强体组成。在300℃的脱脂阶段之后，在50MPa压力下于625℃进行烧结过程60分钟。在汉克溶液中浸泡前后，通过扫描电子显微镜（SEM）和能量色散光谱（EDS）分析对复合材料试样的表面形貌进行了检查。通过热压技术，获得了具有非常致密和均匀微观结构的复合材料试样。虽然AlO增强体改善了机械性能，但在一定程度上（2wt.%AlO）对改变腐蚀性能有效。含8wt.%AlO的试样的最高拉伸强度值约为191MPa。含2wt.%AlO的试样的重量损失和腐蚀速率最低，分别约为9%和2.5mm/年。微观结构中的Mg(OH)结构形成了临时的膜层，而含有Ca、P和O的磷灰石结构在表面表现出持久的行为，并显著提高了耐腐蚀性。
