泡沫钛蠕变发泡动力学研究

Study on dynamics of titanium foams creep processing

通过对基于气体捕捉法制备的泡沫钛发泡过程进行分析,推导出泡沫钛蠕变发泡动力学方程,影响泡沫钛孔隙率的主要因素是发泡温度和基体的蠕变抗力。通过实验获取了不同温度条件下,孔隙率与发泡时间的关系曲线,并建立了其动力学曲线;利用金相显微镜对泡沫钛基体的微观组织进行了分析。研究表明,虽然发泡速率与发泡温度成正比,与基体材料蠕变抗力成反比,但是随着温度的升高,发泡速率并没有一直增加,原因是基体材料的微观组织结构也在发生变化,导致其蠕变抗力随温度的升高先减小后增大,由此证明了上述动力学曲线的合理性。

The foaming dynamics equation of titanium foams was deduced through analyzing the foaming process of titanium foams produced by gas trapping method. The main factors affecting titanium foam porosity are foaming temperature and creep resistance of the matrix. The relation curves of between the porosity and the foaming time,and their kinetic curves under different temperature conditions are built by experimental results. The microstructure of titanium foams matrix was analyzed by metallurgical microscope. It was found that the foaming rate was proportional to the foaming temperature and inversely proportional to the matrix material creep resistance,but with the temperature increases,the foaming rate does not increase continuously. This phenomenon can be explained by the microstructure change of the matrix material whose creep resistance decreases first and then increases with temperature increases. And this proves the reasonable of the kinetic curve.