방전플라즈마소결 공정을 통한 Al-STS316L 복합재료의 제조 및 특성 분석

Abstract

The aluminum(Al)-stainless steel 316L(STS16L) composites were successfully fabricated using ball-milling and spark plasma sintering (SPS) process. First of all, the Al-STS316L composite powder comprised Al-20, 50 and 80 vol.% STS316L to research the optimum composition of Al-STS316L composites. These three composite powders were spark plasma sintered, then were estimated through various analyses such as microstructure, phase analysis and mechanical properties. After selecting the optimum Al-STS316L composition, various sintering conditions such as temperature, pressure and sintering time were changed to study the optimum SPS process conditions. The microstructure and phase analysis of Al-STS316L composites were conducted by scanning electron microscope (SEM), transmission electron microscope (TEM), field emission-electron probe micro analysis (FE-EPMA) and x-ray diffraction (XRD) patterns. The mechanical properties of Al-STS316L composites were analyzed by Vickers hardness and tensile strength test. In addition, thermogravimetric and differential thermal analysis (TG-DTA) and laser flash analysis (LFA) were also conducted to research the thermal properties of Al-STS316L composites. Moreover, the corrosion resistance of Al-STS316L composites was analyzed by a salt spray test. As a results of this research, the Al-STS316L composites made using SPS process could be lightweight, high-corrosion resistance and insulation materials, and were expected to be applied to engineering industries such as aerospace, army, construction.