摘要
采用物质吉布斯自由能函数法,对TiB2材料的氧化进行了热力学分析。热力学计算结果表明:TiB2材料从室温到高温均可以与氧发生反应生成TiO2;当温度T<1450K时,氧化产物为TiO2固相和B2O3液相,在氧化行为上表现为氧化增重;当温度T>1450K时,由于B2O3蒸气挥发,在材料中留下孔隙,增加了TiB2材料与氧气的接触面积,TiB2材料的氧化进程加速,此时,TiB2材料的抗氧化性逐渐下降;在PB2O3=101325Pa的条件下,TiB2材料由"钝化氧化"向"活化氧化"的转变条件为T=1450K;在氧化性气氛下,氧化反应的产物为TiO2,而随着氧分压降低,Ti4O7、Ti3O5、Ti2O3、TiO等氧化产物均有可能出现,尤其是在氧分压很低的情况下,TiO生成的可能性增大。
The thermodynamic analysis on the oxidation of TiB2 material is carried on by using material Gibbs free energy function. The thermodynamic calculation result shows：from ambient temperature to high temperature,TiB2 material can react with oxygen to form TiO2 ;when the oxidation temperature is below 1450 K,the oxidation production is TiO2 solid and B203 liquid ,which has been tested by XRD and SEM. At the sametime,the oxidative behavior exhibits weight addition;when the oxidation temperature is above 1450 K,beeause of the volatilization of B203 vapour,left hole inside the material, which increase the contact area of TiB2 material with oxygen, the oxidation progress of TiB2 material accelerates, while the antioxidation of TiB2 material declines little by little; under the condition of PB2O3 = 101325 Pa, the transition condition of TiB2 material from passive oxidation to active oxidation is T = 1450 K.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2009年第1期162-166,共5页
Bulletin of the Chinese Ceramic Society
基金
西安建筑科技大学基础研究基金(DA09015)
关键词
热力学分析
TiB2材料
氧化
thermodynamic analysis
TiB2 material
oxidation
