Baek Inseok, Lee Seoksoon
Department of Mechanical Engineering and Engineering Research Institute, Gyeongsang National University, 501, Jinju-daero, Jinfu-si, Gyeongsangnam-do 52828, Korea.
Materials (Basel). 2020 Jan 10;13(2):318. doi: 10.3390/ma13020318.
Induction welding is a fast, clean, noncontact process that often uses a metal-mesh susceptor to facilitate localized controlled heating; however, the metal mesh presents various problems. In this study, the induction heating behavior of a 450 μ m thick thin-film susceptor, fabricated by mixing magnetite (Fe 3 O 4 ) nanoparticles (NPs) and PA6/carbon fiber (CF) (30%) thermoplastic resin, was examined with respect to the weight ratio of Fe 3 O 4 (50, 67, 75, and 80 wt%). The useful induction heating behavior of the 75 wt% Fe 3 O 4 susceptor suggested its suitability for additional heat treatment experiments, carried out at 3.4 kW at a frequency of 100 kHz. This susceptor attained the same maximum temperature during 10 cycles of repeated induction heating and cooling. It was then used to weld two thermoplastic composites, with 60 s of induction heating followed by 120 s of simultaneous cooling and pressing. The resulting welded joints had lap shear strength values of 36.8, 34.0, and 36.4 MPa under tensile test loads of 884, 817, and 874 N, respectively. Scanning electron microscopy images confirmed a uniform weld quality. Thus, the proposed manufacturing method, involving the incorporation of Fe 3 O 4 NPs into thermoplastic resin, should help expand the range of applications for thermoplastic composites.
感应焊接是一种快速、清洁的非接触式工艺，通常使用金属网感受器来促进局部控制加热；然而，金属网存在各种问题。在本研究中，研究了一种由磁铁矿（Fe₃O₄）纳米颗粒（NPs）与PA6/碳纤维（CF）（30%）热塑性树脂混合制成的450μm厚薄膜感受器在Fe₃O₄重量比（50、67、75和80 wt%）方面的感应加热行为。75 wt% Fe₃O₄感受器的有效感应加热行为表明其适用于在3.4 kW、100 kHz频率下进行的额外热处理实验。该感受器在10次重复感应加热和冷却循环中达到了相同的最高温度。然后，用其对两种热塑性复合材料进行焊接，感应加热60 s，随后同时冷却和加压120 s。在884、817和874 N的拉伸试验载荷下，所得焊接接头的搭接剪切强度值分别为36.8、34.0和36.4 MPa。扫描电子显微镜图像证实了焊接质量均匀。因此，所提出的将Fe₃O₄ NPs掺入热塑性树脂的制造方法应有助于扩大热塑性复合材料的应用范围。
