SiC含量对两步发泡法制备的SiC/Al基复合泡沫的发泡稳定性、孔结构和压缩性能的影响

Influence of SiC Content on Foaming Stability, Cell Structure, and Compression Performance of SiC/Al-Based Composite Foam Prepared by Two-Step Foaming Method

摘要:

采用两步发泡法制备了SiC/Al基复合泡沫。研究了SiC含量及其分布均匀性对泡沫铝的发泡稳定性、孔结构和力学性能的影响，对泡沫铝的宏观/微观特征进行了表征和分析。结果表明，适当增加SiC的含量并使SiC分布均匀，可以提高泡沫铝的发泡稳定性，优化孔径和孔壁厚度的大小以及孔的分布，增强泡沫铝的硬度和抗压缩强度。然而，SiC含量不足或过多都会导致SiC颗粒分布不均，不利于发泡稳定性和良好孔结构的形成。当SiC含量为6wt%时，泡沫铝的发泡稳定性和孔结构都达到了最佳状态，从而获得了最高的压缩强度和最佳能量吸收能力。

Abstract:

SiC/Al-based composite foams were prepared by a two-step foaming method. The influence of the SiC content and its distribution uniformity on the foaming stability, cell structure, and mechanical properties of the aluminum foams was investigated. The macro/micro-features of the aluminum foams were characterized and analyzed. Results demonstrate that an appropriate increase in SiC content and the uniform distribution of SiC can improve the foaming stability, optimize the cell diameter and cell wall thickness, ameliorate the cell distribution, and enhance the hardness and compressive strength of the aluminum foams. However, either insufficient or excessive SiC leads to uneven distribution of SiC particles, which is unfavorable to foaming stability and good cell structure formation. With 6wt% SiC, both the foaming stability and cell structure of the aluminum foam reach the optimal state, resulting in the highest compressive strength and optimal energy absorption capacity.