吹气法泡沫铝泡壁表面氧化膜（英文）

发布时间：2018-03-26 12:33

本文选题：泡沫铝　切入点：吹气法　出处：《Transactions of Nonferrous Metals Society of China》2015年07期

【摘要】：以A356铝合金为原料,使用高纯氮气、空气以及氧气体积分数为0.2%~8.0%的混合气体通过吹气法制备泡沫铝样品。利用金相显微镜、SEM和AES等检测技术,研究气体中氧气含量对泡沫铝泡孔结构、相对密度、泡壁宏观及微观形貌、氧化膜覆盖面积分数和氧化膜厚度的影响。结果表明,当氧气体积分数小于1.2%时,氧化膜覆盖面积分数随着氧气含量的上升而增加。当氧气体积分数大于1.6%时,氧化膜覆盖了泡壁的全部表面,可以制备出泡孔结构良好的泡沫铝。由氧气体积分数为1.6%~21%的气体制备泡沫铝泡壁的氧化膜厚度几乎不变。此外,从理论上分析氧化膜厚度不随氧气体积分数改变而改变的原因及实现氧化膜全覆盖的需氧量。最后,基于实验现象分析氧化膜在吹气法泡沫铝泡沫稳定中的作用。
[Abstract]:Using A356 aluminum alloy as raw material, aluminum foam samples were prepared by blowing gas with high purity nitrogen, 0.2wt% air and oxygen volume fraction. Metallographic microscope and AES were used to detect the aluminum foam. The effects of oxygen content in gas on the pore structure, relative density, macroscopic and microscopic morphology of foam wall, the coverage area fraction of oxide film and the thickness of oxide film are studied. The results show that the oxygen content is less than 1.2 when oxygen volume fraction is less than 1.2. When the oxygen content is greater than 1.6, the oxide film covers the whole surface of the bubble wall. Aluminum foams with good pore structure can be prepared. The oxide film thickness of aluminum foam wall can be almost unchanged when the oxygen content is 1.6% and 21% gas. The reason why the thickness of oxide film does not change with the change of oxygen volume fraction and the oxygen demand to realize the full coverage of oxide film are analyzed theoretically. Finally, based on the experimental phenomena, the role of oxide film in the stabilization of foamed aluminum foam is analyzed.
【作者单位】：清华大学材料学院;清华大学先进成形制造教育部重点实验室;
【基金】：Project(51371104)supported by the National Natural Science Foundation of China
【分类号】：TG146.21

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