TiH2常用作泡沫铝和粉末冶金制品的原料,控制其脱氢进度是生产中的关键步骤.利用XRD与DSC技术得到TiH2在氩气气氛中加热分解分3步完成,即TiH2→TiH1 5→Ti(固溶)→Ti.用单个扫描速率法和多重扫描速率法对DSC/TG数据进行计算,得到TiH2→TiH1.5的机理模式为球形对称边界反应,TiH1.5→Ti(固溶)的机理模式为化学反应,Ti(固溶)→Ti转变机理为三维球形对称扩散,3步转变的活化能分别为240、190和145 kJ/mol.因此,与单个扫描速率法相比,采用多重扫描速率法研究TiH2热分解,其结果与实际情况更接近.
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