Effect of La Ion-implantation on High Temperature Ozidation of Ni-40Cr Catalyst Support
Ni-based alloys are widely used in combustion process, and their catalytic activities are strongly influenced by factors such as the nature of support, active phase, metal loading, catalyst preparation method and pretreatment. The isothermal and cyclic oxidizing kinetics of Ni-40Cr alloy and its lanthanum ion-implanted samples were studied at 1000℃ in air by thermalgravimetric analysis (TGA). Scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM) was used to examine the oxide films morphology and structure after oxidation. Secondary ion mass spectrum (SIMS) method was used to examine the binding energy change of chromium caused by La-doping and its influence on formation of Cr2O3 film. Laser Raman spectrum was used to examine the tress changes within oxide films. It was found that lanthanum implantation remarkably reduced the isothermal oxidizing rate of Ni-40Cr and improved the anti-cracking and anti-spalling properties of Cr2O3 oxide film. The reasons for the improvement were mainly that the implanted lanthanum reduced the grain size and internal stress of Cr2O3 oxide, increased the high temperature plasticity of oxide film. Lanthanum mainly existed in the outer surface of Cr2O3 oxide film in the forms of fine La2O3 and LaCrO3 spinel particles.
ion-implantation nickel lanthanum catalyst Raman spectrum
Jin Huiming Felix Adriana
College of Mechanical Engineering Yangzhou University Yangzhou,China College of Materials Engineering National University of Antiuquia Medellin,Colombia
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）