Akrout Mabrouka, Ben Difallah Basma, Kharrat Mohamed, Dammak Maher, Pereira António, Oliveira Filipe J, Duarte Isabel
Laboratory of Electromechanical Systems, National School of Engineers of Sfax, University of Sfax, Soukra Road, Km 3.5, PO Box 1173, Sfax 3038, Tunisia.
Department of Mechanical Engineering, Centre for Mechanical Technology and Automation (TEMA), University of Aveiro, 3810-193 Aveiro, Portugal.
Materials (Basel). 2023 Sep 27;16(19):6428. doi: 10.3390/ma16196428.
The purpose of this work was to investigate the structural, thermal, micromechanical and tribological properties of novel polymer/metal composite materials for bearing applications. Copper (Cu)-filled Acrylonitrile Butadiene Styrene (ABS) composites were mixed in a laboratory scale by an internal mixer with two blade impellers, and then injection-molded. Neat ABS, ABS+5wt% Cu, ABS+10wt% Cu, and ABS+15wt% Cu were the four materials that were tested. The dispersion of Cu particles in the ABS matrix was investigated using Scanning Electron Microscopy (SEM) and a micro-tomography scan. The filler particles have a uniform distribution in the matrix, according to the observations. The incorporation of Cu filler also refined an increase in the glass transition temperature from Differential Scanning Calorimetry (DSC) and less intensity in the amorphous phase by X-ray diffraction (XRD). Nanoindentation tests were carried out to characterize the micro-mechanical behavior of the composites. Friction and wear analysis were also examined using a pin-on-disk tribometer. Compared with neat ABS, all the micro-composites showed much higher indentation hardness, Vickers hardness, and indentation elastic modulus. It was also concluded that the incorporation of Cu filler into ABS simultaneously improved the friction and wear properties of the composites, which contributed to the suitability of the micro-filled composites with hard metallic particles for a wider range of mechanical components for bearing applications.
这项工作的目的是研究用于轴承应用的新型聚合物/金属复合材料的结构、热性能、微观力学性能和摩擦学性能。通过带有两个叶片叶轮的内部混合器在实验室规模下将铜（Cu）填充的丙烯腈-丁二烯-苯乙烯（ABS）复合材料进行混合，然后注塑成型。测试的四种材料分别是纯ABS、ABS + 5wt% Cu、ABS + 10wt% Cu和ABS + 15wt% Cu。使用扫描电子显微镜（SEM）和微观断层扫描研究了Cu颗粒在ABS基体中的分散情况。根据观察结果，填料颗粒在基体中分布均匀。通过差示扫描量热法（DSC）发现，Cu填料的加入还使玻璃化转变温度升高，并且通过X射线衍射（XRD）发现非晶相的强度降低。进行纳米压痕测试以表征复合材料的微观力学行为。还使用销盘摩擦磨损试验机对摩擦和磨损进行了分析。与纯ABS相比，所有微复合材料都表现出更高的压痕硬度、维氏硬度和压痕弹性模量。研究还得出结论，将Cu填料加入ABS中同时改善了复合材料的摩擦和磨损性能，这使得含有硬金属颗粒的微填充复合材料适用于更广泛的轴承应用机械部件。
