表面制备SiO2涂层的Ti2AlNb基合金高温氧化激活能研究

摘要

Amorphous silica coating was deposited on a Ti2AlNb alloy by sol-gel method.The kinetic data of oxidation mass gain was measured for coated and blank samples at 800℃ and 900℃ in air,and the oxidation rate constants at different temperatures were determined by the relevant linear fitting.According to Arrhenius relation of the oxidation rate constants,the activation energy of oxidation was derived for these samples at 800 ℃ and 900 ℃.It is found that the oxidation rate constant of coated sample is lower than the blank one and the value of activation energy of oxidation of coated sample is higher than the blank sample.%利用溶胶-凝胶法在Ti2AlNb基合金表面制备非晶SiO2涂层,测定了涂层样品和空白样品在800℃和900℃下空气氧化增重动力学数据,通过线性拟合获取试样在不同温度下的氧化速率常数.根据氧化速率常数的Arrhenius关系,计算试样在800℃和900℃高温环境中的氧化激活能.结果表明,涂层样品较空白样品的氧化速率常数降低,氧化激活能升高.