Gadelmoula Abdelrasoul, Aldahash Saleh Ahmed
Department of Mechanical and Industrial Engineering, College of Engineering, Majmaah University, Al-Majmaah 11952, Saudi Arabia.
Department of Mechanical Design and Production Engineering, Faculty of Engineering, Assiut University, Assiut 71515, Egypt.
Polymers (Basel). 2023 Mar 2;15(5):1268. doi: 10.3390/polym15051268.
To enhance the properties of polyamide 12 (PA12/Nylon 12) manufactured by the selective laser sintering (SLS) process, micron-sized glass beads are used as a filler, and the resulting composite is known as glass bead-filled PA12 (PA 3200 GF). Despite PA 3200 GF basically being a tribological-grade powder, very little has been reported on the tribological properties of laser-sintered objects based on this powder. As the properties of SLS objects are orientation-dependent, this study is devoted to investigating the friction and wear characteristics of the PA 3200 GF composite sliding against the steel disc in the dry-sliding mode. The test specimens were aligned in the SLS build chamber along five different orientations (X-axis, Y-axis, Z-axis, XY-plane, and YZ-plane). Additionally, the interface temperature and the friction-induced noise were measured. The pin-shaped specimens were examined using a pin-on-disc tribo-tester for 45 min to investigate the steady-state tribological characteristics of the composite material. The results revealed that the orientation of build layers relative to the sliding plane was a ruling parameter that determined the dominant wear pattern and the wear rate. Accordingly, where build layers were parallel or inclined to the sliding plane, abrasive wear predominated, and wear rate became 48% higher than that of specimens with perpendicular build layers, for which adhesive wear predominated. Interestingly, a noticeable synchronous variation of adhesion and friction-induced noise was observed. Taken together, the results from this study can efficiently serve the goals of fabricating SLS-functional parts with customized tribological properties.
为了提高通过选择性激光烧结（SLS）工艺制造的聚酰胺12（PA12/尼龙12）的性能，微米级玻璃珠被用作填料，由此得到的复合材料被称为玻璃珠填充PA12（PA 3200 GF）。尽管PA 3200 GF基本上是一种摩擦学级粉末，但关于基于这种粉末的激光烧结物体的摩擦学性能的报道却很少。由于SLS物体的性能取决于取向，本研究致力于研究PA 3200 GF复合材料在干滑动模式下与钢盘滑动时的摩擦和磨损特性。测试样品在SLS成型腔中沿五个不同取向（X轴、Y轴、Z轴、XY平面和YZ平面）排列。此外，还测量了界面温度和摩擦产生的噪声。使用销盘摩擦磨损试验机对销形样品进行了45分钟的测试，以研究复合材料的稳态摩擦学特性。结果表明，成型层相对于滑动平面的取向是决定主要磨损模式和磨损率的主导参数。因此，当成型层与滑动平面平行或倾斜时，磨粒磨损占主导，磨损率比成型层垂直的样品高48%，后者以粘着磨损为主。有趣的是，观察到粘着和摩擦产生的噪声有明显的同步变化。综上所述，本研究的结果可以有效地服务于制造具有定制摩擦学性能的SLS功能部件的目标。
