TiD_(1.92)热解析的动力学行为研究

采用热分析和理论计算的方法对TiD1.92粉末的解析行为进行了研究。计算的TiD1.92粉末有3类解析峰,均与TiD1.92解析中发生相变导致的氘扩散速率变化有关。球形颗粒模型的解析与平板颗粒模型的解析因其相变和扩散机制不同导致β→α相变解析峰表现出一定的差异。TiD1.92粉末的热分析结果与平板颗粒模型的计算结果完全一致,其中δ相和β相钛氘化物的解析由表面反应控制,β→α相变阶段的解析由氘在α相的扩散控制,实验获得氘在钛表面的解析活化能为152.8kJ/mol以及氘在α相中的扩散活化能为68.6kJ/mol。

Kinetics Study of Thermal Decomposition of TiD1.92

The thermal decomposition of TiD_1.92 powder to titanium was investigated by means of thermal analysis and theoretical calculation. The model that considers bulk and surface processes during desorption shows three kinds of peak in the spectrum. They are all related to phase transformation. The calculated spectrum of spheres particle model is different from the spectrum of planar particle model for their different diffusion models. The decomposition behavior of TiD_1.92 by thermal analysis is consist with the result of planar particle model, the rate controlling process in δ-Ti and β-Ti is the reaction between hydrogen atoms to form gaseous molecules on the surface, and the rate controlling process of decomposition during β→α transform is the deuterium diffusion in α-Ti. Arrhenius plots of experiment data give 152.8 kJ/mol of the surface reaction activation and 68.6 kJ/mol of the deuterium diffusion activation in α-Ti.