Kościelniak Barbara, Groch Diana, Nowak Wojciech J, Drajewicz Marcin, Kwolek Przemysław
Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, al. Powstańców Warszawy 12, 35-959 Rzeszow, Poland.
Materials (Basel). 2024 Oct 31;17(21):5331. doi: 10.3390/ma17215331.
The high-energy ball milling process was applied to fabricate a composite material from 7075 aluminium alloy milling chips, silicon carbide, and titanium dioxide powders. Raw materials were ground, and the obtained powders were cold pressed and sintered. It was demonstrated that this method can be used in the recycling of aluminium alloy scrap characterised by a high surface-to-volume ratio, and also that chemical removal of the oxide layer from chips is not necessary. The finest particles, with 50 vol.% of their population below 36 μm, were obtained after grinding for 60 min at a 1000 rpm rotational speed. Such an intensive grinding was necessary to fabricate the compact composite material with a homogeneous microstructure and a low porosity of 0.7%. The corrosion resistance of the composites was studied in 3.5 wt.% NaCl solution using cyclic voltammetry and electrochemical impedance spectroscopy, and corrosion rates in the range of ca. 342 and 3 μA∙cm were obtained. The corrosion mechanism includes aluminium alloy dissolution at the matrix/reinforcement interphase and around intermetallic particles localised within the matrix grains.
采用高能球磨工艺，以7075铝合金铣削切屑、碳化硅和二氧化钛粉末为原料制备复合材料。对原料进行研磨，然后将所得粉末进行冷压和烧结。结果表明，该方法可用于回收具有高比表面积的铝合金废料，而且无需对切屑进行化学除氧化层处理。在1000 rpm转速下研磨60分钟后，获得了最细颗粒，其中50 vol.%的颗粒尺寸小于36μm。为制备具有均匀微观结构和0.7%低孔隙率的致密复合材料，需要进行如此强烈的研磨。采用循环伏安法和电化学阻抗谱研究了复合材料在3.5 wt.% NaCl溶液中的耐蚀性，得到的腐蚀速率约为342和3 μA∙cm。腐蚀机制包括铝合金在基体/增强相界面以及基体晶粒内局部存在的金属间化合物颗粒周围的溶解。
