Effects of Aluminizing on The High Temperature Oxidation Behavior of High Silicon Cast Iron
In this study, the aluminizing of high silicon cast iron by hot-dipping in pure Al melt was performed and their high temperature oxidation behaviour was tested at 750 ℃ for virous exposure time. After high temperature oxidation tests, the microstructure analysis of all samples were investigated by means of metallographical examination, scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectrometer (EDS) and X-ray diffractometry (XRD).The results showed that the coating layers consisted of three layer, in the sequence of Al, Fe-Al and Si-rich layers from external topcoat to substrate. Nodules graphite had a blocking effect to retard the outward diffusion of Fe atoms and impeded the growth of Fe2Al5 in C-axis. Eventually, the cast iron substrate was oxidized directly by oxygen penetration via the greater cracks and pores to form Fe oxide nodules after 750 ℃ oxidation for 48h.
High silicon cast iron Nodules Decarburization Aluminide layer
Meng-Bin Lin Chaur-Jeng Wang
Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan
国际会议
青岛
英文
2151-2154
2009-10-09（万方平台首次上网日期，不代表论文的发表时间）