摘要
在600~700℃、25 MPa超临界水中对Haynes 282镍基合金进行氧化,研究了不同温度和时间下合金的氧化动力学曲线以及氧化膜的表面形貌、微观结构和物相组成等。结果表明:Haynes 282合金的单位面积氧化质量增加随着温度的升高和时间的延长而增大;600℃时合金的氧化动力学曲线遵循抛物线规律,650,700℃时的氧化动力学曲线介于抛物线和直线规律之间;合金表面的氧化膜具有双层结构,外层为呈松散的多面体形状的微米尺寸氧化物颗粒,内层为由细小晶粒组成的致密氧化膜;600℃氧化后氧化膜内层主要为Cr_2O_3,外层则为TiO_2;650℃氧化后氧化膜外层由TiO_2与MnCr_2O_4组成,而内层由Cr_2O_3和少量的MnCr_2O_4组成;700℃氧化后氧化膜外层由NiCr_2O_4与MnCr_2O_4组成,而内层由Cr_2O_3和少量的MnCr_2O_4组成。
Haynes 282 nickel-based alloy was oxidized in supercritical water at 600-700℃and 25 MPa,and then oxidation kinetics curves of the alloy and the surface morphology,microstructure and phase composition of the oxide film were investigated.The results show that the oxidation mass gain per unit area increased with the increase of the temperature and time.The oxidation kinetics curves followed parabolic law at 600 ℃ while obeyed the law between straight law and parabolic law at 650,700℃.A double-layered oxide film was formed on the surface of the alloy.The outer layer consisted of scattered oxide particles in micrometer size with the loose polyhedral shape.The inner layer was a compact oxide film composed of tiny grains.The inner layer mainly composed of Cr_2O_3 and the outer layer composed of TiO_2 were formed on the surface of the alloy at 600℃.The outer layer of the oxide film at 650 ℃ was composed of MnCr_2O_4 and TiO_2,and the inner layer consisted of Cr_2O_3 and a small amount of MnCr_2O_4.The outer layer of the oxide film at 700℃ was composed of NiCr_2O_4 and MnCr_2O_4,and the inner layer consisted of Cr_2O_3 and a small amount of MnCr_2O_4.
出处
《机械工程材料》
CAS
CSCD
北大核心
2018年第3期1-8,共8页
Materials For Mechanical Engineering
基金
国家自然科学基金资助项目(51471069)
北京市自然科学基金资助项目(2152029)
中央高校基本科研业务费专项资金资助项目(2015ZZD05)
