摘要
采用电弧熔炼法制备了Fe3Si金属间化合物。选用AISI304不锈钢作对比,研究了Fe3Si在800℃和900℃空气环境中的高温抗氧化性能,利用XRD,SEM,EPMA等测试设备对Fe3Si金属间化合物进行了表征。结果表明:在800℃,900℃下,Fe3Si金属间化合物都表现出较AISI 304不锈钢更好的高温抗氧化性能。其在800℃的氧化动力学近似表现为抛物线、线性复合规律9,00℃下则转变为单一的二次抛物线规律。800℃下,Fe3Si初始的氧化膜生长机制受Si的扩散过程控制,而后因氧化膜剥落严重而转变为Si的氧化反应控制;900℃下,Fe3Si的氧化动力学过程主要受扩散过程控制,Si的扩散是氧化膜生长机制的主因,辅有Fe从SiO2膜向外扩散的传质过程。
Fe3Si intermetallic was prepared using vacuum arc melting.The oxidation products of Fe3Si intermetallic were characterized by XRD,SEM,EPMA.Meanwhile,Fe3Si oxidation resistances were studied at temperature 800℃ and 900℃.The results show that the oxidation resistance of Fe3Si intermetallic is better than AISI 304 stainless steel at temperature 800℃ and 900℃.The oxidizing dynamics curves of Fe3Si was complex curves conforming to parabolic rule and linear rule at temperature 800℃.But at temperature 900℃ it was single parabolic curves.The initial growth mechanism of oxide layer was diffusion process of Si at temperature 800℃,and then with the crumbling of oxide layer,the growth mechanism was diffusion process of Si.The process of the oxidation kinetics was controlled by diffusion process at 900℃.Diffusion process of Si played a leading role in growth mechanism of oxide layer,with a mass transfer of Fe moved away from SiO2 of film.
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2011年第2期72-78,共7页
Journal of Aeronautical Materials
基金
甘肃省自然科学基金(1014RJZA006)
作者简介
周琦（1963-），女，硕士，教授，从事新材料的开发与应用研究，（E—mail）zhouxq301@sina．com。
