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Improvements in Stabilisation and Cellular Structure of Al based Foams with Novel Carbonate Foaming Agent

机译:新型碳酸盐发泡剂改善铝基泡沫的稳定性和孔结构

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摘要

In the present paper the applicability of CaCO_3 foaming agent for making Al-based foams by Alporas route as well as by powder compact technique is studied. Its effect on the foaming behaviour of the melt or powder precursor, stabilisation of liquid foam with solid particles, layers or network of thin oxide films as well as on the cell size and cell wall microstructure of final solid foam is clarified and discussed in comparison with conventional TiH_2 foaming agent. It is underlined that application of the novel foaming agent is more favourable in view of the processing conditions because of remarkable improvement in foam stabilisation by melt oxidation. In addition, advantages in application of CaCO_3 as foaming agent for clearing the cell wall material from undesirable contaminations induced typically by conventional titanium hydride TiH_2 is justified.
机译:本文研究了CaCO_3发泡剂通过Alporas途径以及粉末压制技术制备Al基泡沫的适用性。澄清并讨论了其对熔体或粉末前体的发泡行为,具有固体颗粒的液态泡沫,薄氧化膜层或网络的稳定以及对最终固体泡沫的泡孔尺寸和孔壁微结构的影响。常规的TiH_2发泡剂。着重指出,鉴于加工条件,新型发泡剂的应用是更有利的,因为通过熔融氧化的泡沫稳定性得到显着改善。另外,证明了使用CaCO 3作为发泡剂以清除孔壁材料免受通常由常规氢化钛TiH 2引起的不希望的污染的优点。

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