BT25Y钛合金在600~800℃的高温氧化行为  

High Temperature Oxidation Behavior of BT25Y Titanium Alloy at 600~800℃

作　　者：刘艳明 赵兴兴 汪欣[3] 李洪福[4] 辛社伟[3] Liu Yanming;Zhao Xingxing;Wang Xin;Li Hongfu;Xin Shewei(College of Materials Science and Engineering,Xi’an Shiyou University,Xi’an 710065,China;Xi'an Key Laboratory of High Performance Oil and Gas Field Materials,Xi5an 710065,China;Northwest Institute for Non-ferrous Metal Research,Xi’an 710016,China;Xinjiang Oilfield Oil-Gas Storage and Transportation Company,China National Petroleum Corporation,Karamay 831100,China)

机构地区：[1]西安石油大学材料科学与工程学院,陕西西安710065 [2]西安市高性能油气田材料重点实验室,陕西西安710065 [3]西北有色金属研究院,陕西西安710016 [4]中国石油天然气股份有限公司新疆油田油气储运分公司,新疆克拉玛依831100

出　　处：《稀有金属材料与工程》2022年第4期1332-1340,共9页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51701157,52071274);西安石油大学研究生创新项目(YCS20211041);陕西省创新人才推动计划-青年科技新星项目(2020KJXX-062)。

摘　　要：研究了BT25Y钛合金在600、700和800℃下的高温氧化行为。采用连续氧化增重法,并结合氧化速度常数、氧化活度等理论计算了合金的氧化动力学和热力学规律;利用XRD、SEM和EDS等表征方法研究了氧化膜的相结构和表面、截面形貌及元素分布。结果表明:BT25Y钛合金在600和700℃均有较好的抗氧化性能,其连续氧化动力学曲线符合抛物线规律,氧化层由细小TiO;和Al_(2)O_(3)组成,氧化膜可有效阻止氧渗入基体,降低氧化速度;BT25Y钛合金在800℃氧化严重,其连续氧化动力学曲线近似符合直线规律,氧化层由Al_(2)O_(3)层和TiO;层交替组成,氧化膜疏松多孔,不能有效阻挡氧向基体一侧的扩散。The high temperature oxidation behavior of BT25Y titanium alloy at 600,700 and 800℃was studied.The thermodynamics and kinetics laws of the alloy oxidation were calculated by the method of continuous oxidation mass gain,oxidation rate constant and oxidation activity.The phase composition,surface and cross-section morphologies and elemental distribution of the oxide scale were investigated by XRD,SEM and EDS,respectively.The results show that BT25Y titanium alloy exhibits good oxidation resistance at 600 and 700℃,and the oxidation kinetics curves follow the parabolic law.The continuous oxide scale composed of fine TiO;and Al_(2)O_(3)particles can effectively prevent oxygen from infiltrating into the matrix and then remarkably reduce the oxidation rate.At 800℃,the oxidation behavior of the BT25Y titanium alloy is catastrophic,and its continuous oxidation kinetics approximately follows the linear law.The oxide layer is alternately composed of Al_(2)O_(3)layer and TiO;layer,and the oxidation film is loose and porous,which cannot effectively prevent the diffusion of oxygen into the matrix.

关 键 词：BT25Y钛合金 高温氧化 氧化动力学 微观结构 

分 类 号：TG146.23[一般工业技术—材料科学与工程]