宏观大孔在泡沫钛烧结过程的体积变化

摘要

理论分析造孔剂技术制备的泡沫钛中宏观大孔在烧结过程体积减小、不变和增大3种条件下所获得的泡沫孔隙率。比较不同条件下孔隙率与造孔剂含量的关系，并对宏观大孔在烧结过程的体积变化进行探讨。结果表明，第一种情况下的孔隙率与造孔剂含量的关系取决于宏观大孔在烧结过程的体积减小量和骨架上微观小孔的体积，而另外两种情况下所获得的孔隙率大于造孔剂含量。理论分析表明所得宏观大孔在烧结过程的体积是减小的。%The porosity of titanium foams obtained from the space holder technique was theoretically analyzed in the cases of volume shrinking, retaining and expanding during sintering. The relationship between porosity and spacer content was compared under different conditions. The kind of volume change of macropores during sintering was discussed. The results indicate that the relationship between porosity and spacer content depends on the decreased volume of macropores and the volume of micropores in cell-walls in the first case, while the porosity will be greater than the spacer content for the other two cases. It proves that the volume change of macropores during sintering decreases based on theory and practice.