Growing kinetics and structural characterization of oxide film formed on La-doped Co-40Cr alloy

作     者：Hui Ming Jin Adriana Felix Majorri Aroyave 

作者机构：College of Mechanical Engineering Yangzhou University Yangzhou 225009 China College of Materials Engineering National University ofAntioquia Medelin 23715 Colombia 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2007年第18卷第5期

页      面：577-580页

核心收录：

学科分类：080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：This work was supported by National Natural Science Foundation of China (No.29233011) National Natural Science Foundation of Colombia (M018327) 

主　　题：Oxidation Doping Raman spctrum SIMS Lanthanum 

摘      要：The isothermal and cyclic oxidizing kinetics of Co-40Cr alloy and its lanthanum ion-implanted samples were studied at 1000 ℃ in air by thermal-gravity analysis （TGA）. Scanning electronic microscopy （SEM） and transmission electronic microscopy （TEM）） were used to examine the oxidized film＇s morphology and the 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 oxidized films. It was found that lanthanum implantation remarkably reduced the isothermal oxidizing rate of Co-40Cr and improved the anti-cracking and anti-spalling properties of Cr2O3 film. The reasons were that the implanted lanthanum reduced the grain size and internal stress of Cr2O3 oxide, increased the high temperature plasticity of oxidized film. Lanthanum mainly existed in the outer surface of Cr2O3 film in the forms of fine La2O3 and LaCrO3 spinel panicles.