Ti40合金的高温氧化动力学研究

Study on High Temperature Oxidation Kinetics of Ti40 Alloy

为了准确预测外界环境对Ti40合金氧化反应的影响规律,利用一种新的气固反应动力学模型对阻燃钛合金Ti40合金在773~1 273 K范围内的恒温氧化行为进行研究。发现Ti40合金在773~873 K时的氧化主要受内扩散控制,活化能为262.20 k J/mol;在973~1 273 K时的氧化主要受界面反应控速,其活化能为155.67 k J/mol。另外,通过模型预测了各因素(氧气分压、温度、目标氧化厚度等)对其氧化反应分数ξ、特征时间tc和转化速率dξ/dt的影响规律。

For predicting the influence rule of external environment on the oxidation reaction of Ti40 alloy, a new gas- solid reaction kinetics model was used to study the isothermal oxidation behavior of Ti40 flame-retarded alloy in the range of 773-873 K. It was found that the oxida- tion of Ti40 alloy in the range of 773-1 273 K was mainly controlled by internal diffusion, and the activation energy was 262.20 kJ/mol. In the range of 973-1 273 K, the oxidation process was mainly controlled by the interface reaction, and the activation energy was 155.67 kJ/mol. In addition, the reaction fraction ξ, characteristic reaction time tc and conversion rate dξ/dt under various parameters （ pressure, temperature and target oxidation thickness） were predicted by the model.