摘要
采用TG-DSC热分析仪,对TiB2粉末氧化进行了热重分析;采用等温氧化增重法,对TiB2粉末的氧化行为进行了研究,并对氧化产物进行了XRD分析和SEM分析。结果表明,TiB2粉末的氧化行为,在氧化温度低于1000℃时,其氧化增重与氧化时间之间符合抛物线规律,氧化机理为氧通过产物层的向内扩散为主要控制步骤;当氧化反应温度高于1000℃时,在氧化界面上的化学反应速度成为控制步骤。XRD和SEM分析表明,当氧化温度低于1200℃时,氧化产物相为TiO2(金红石)和B2O3(液相)当氧化温度高于1200℃时,由于B2O3液相转变为气相B2O3,氧化产物为TiO2(金红石)。
By using TG-DSC thermal analysiser,the thermogravimetric analysis of TiB2 powder in air was carried out.By using omnirange isothermal thermogrametiic method,the oxidation behavior of TiB2 powder was studied.The XRD and SEM analysis about oxidation product were used as well.The result showed that when the oxidation temperature was below 1000℃,the oxidation behavior of TiB2 powder obeyed paralic law between the oxidation gain in weight and oxidation time and the diffusion of oxygen through oxidation layer is the oxidation mechanism ; when the oxidation temperature was above 1000℃, the main controll procedure was the chemical reaction rate on the oxidation boundary. XRD and SEM analysis showed that the oxidation product was TiO2 （rutile） and B2O3 （liquid） when the the oxidation temperature was below 1200℃ ; when the oxidation temperature was above1200℃, the oxidation product was TiO2（rutile） because of liquid B2O3 changeing into vapor B2O3.
出处
《轻金属》
CSCD
北大核心
2009年第10期52-55,59,共5页
Light Metals
基金
西安建筑科技大学材料学院"濮耐"科研基金
西安建筑科技大学基础研究基金(编号JC0815)
关键词
TIB2
氧化行为
氧化机理
TiB2
oxidation behavior
oxidation mechanism
