摘要
研究了新型耐650℃高温钛合金Ti650在600~700℃下的氧化行为。通过氧化增重试验研究了氧化动力学规律,采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)分析了氧化膜的相结构和表面形貌,同时测试了氧化层对力学性能的影响。结果表明,Ti650合金氧化过程分为氧化初始阶段(<50 h)和氧化稳定阶段(50~100 h)。氧化初期质量增益迅速上升,当氧化时间超过50 h后,氧化速度减慢并趋于平稳,氧化进入稳定阶段。Ti650合金的氧化反应指数n值大于2,表明Ti650合金在700℃以下具有良好的抗氧化性能。Ti650合金的氧化反应产物主要为TiO2,呈颗粒状。随着氧化温度的升高和氧化时间的延长,TiO2颗粒尺寸增大。
The oxidation behavior of a new 650℃high temperature titanium alloy Ti650 at 600~700℃was studied.The law of the oxidation kinetics was studied by oxidation weight gain test.The phase structure and surface morphology of the oxide film were analyzed using X-ray diffraction(XRD)and scanning electron microscopy(SEM).The influence of oxide scale on mechanical properties was also tested.The results show that the oxidation process of Ti650 alloy can be divided into initial oxidation stage(<50 h)and stable oxidation stage(50~100 h).At the initial oxidation stage,the mass gain increases rapidly.When the oxidation time exceeds 50 h,the oxidation speed slows down and tends to be stable,and the oxidation enters a stable stage.The oxidation reaction index n of Ti650 alloy is greater than 2 which indicates that Ti650 alloy has a good oxidation resistance below 700℃.The oxidation product of Ti650 alloy is mainly TiO 2 in granular form.With the increase of oxidation temperature and oxidation time,TiO 2 particle size increases.
作者
周伟
辛社伟
洪权
王晓
侯红苗
杨海瑛
赵圣则
Zhou Wei;Xin Shewei;Hong Quan;Wang Xiao;Hou Hongmiao;Yang Haiying;Zhao Shengze(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)
出处
《钛工业进展》
CAS
2023年第2期15-18,共4页
Titanium Industry Progress
关键词
高温钛合金
高温氧化
氧化动力学
TIO2
high temperature titanium alloy
high temperature oxidation
oxidation kinetics
TiO 2
