【摘要】 通过SEM、EDS、XRD分析了0Cr18Ni9Ti钢热浸镀铝层在1000℃氧化180 h后的组织变化情况,以及高温抗氧化性能与微观结构的关系。结果表明,热浸镀铝层的高温氧化动力学曲线符合抛物线规律,其抗高温氧化性能明显优于未浸镀件。在1000℃氧化180 h试验表明,镀层由Al和FeAl2相转变为β-NiAl相和FeAl相,以及很少量的β-Al2O3相。在高温氧化过程中,真正起到抗高温氧化作用的是扩散层中的金属间化合物FeAl相和β-NiAl相,β-AlO氧化膜主要起抑制氧进入的作用。更多还原

【Abstract】 The high temperature oxidation resistance of hot-dip aluminizing layer of 0Cr18Ni9Ti austenitic stainless steel oxidation at 1 000 ℃ for 180 h were analyzed by means of EDS,SEM and XRD.The results show that the oxidation kinetic curves of the steel hot-dip aluminizing layer accord with parabolic law and the oxidation resistance of the coating is obviously superior to that without coating.The 1 000 ℃×180 h oxidation test show that Al and FeAl2 in the hot-dip aluminum layer translate into β-NiAl,FeAl and a spot of β-Al2O3.It is intermetallic compound FeAl and β-NiAl in diffusion layers that really play the role of high temperature oxidation resistance,and β-Al2O3 oxide film play a major role of preventing oxygen from entering during high temperature oxidation.更多还原