A new alloy design concept for austenitic stainless steel with tungsten modification for bipolar plate application in PEMFC

The feasibility of a new alloy design concept utilizing the principle of ‘tungsten bronze effect’ is critically evaluated for the development of metallic bipolar plates for proton exchange membrane fuel cell (PEMFC). An austenitic stainless steel (ASS) is modified with W and La to improve the stability of the passive film in an acidic environment as well as to reduce the contact resistance by the tungsten bronze effect. The experimental ASS containing W and La was evaluated in a simulated PEMFC environment of H₃PO₄ and H₂SO₄ solutions at 80 °C, and the electrical property was evaluated by performing a contact resistance test. The test results show that the ASS modified with W and La has good passive film stability for corrosion resistance and low contact resistance. The X-ray photoelectron spectroscopy (XPS) analysis clearly suggests the possibility of the tungsten bronze effect from the change in valency state of W⁶⁺ to W⁵⁺ in the passive film formed on the modified ASS. The feasibility of a new alloy design concept utilizing the ‘tungsten bronze effect’ is well demonstrated; however, more study is highly required for the development of metallic bipolar plates of PEMFC.     

热宽带钢连轧机调宽轧制工艺参数研究

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一种微机控制的多测头凸轮轴测量系统

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测定磷酸异戊酯（ＴｉＡＰ）对Ｕ（Ⅵ）、Ｎｐ（Ⅳ）、Ｎｐ（Ⅴ）、Ｎｐ（Ⅵ）、Ｐｕ（Ⅳ）和Ｐｕ（Ⅲ）的萃取性能及对Ｔｈ（代替Ｐｕ）的萃取容量。研究了二乙三胺五乙酸（ＤＴＰＡ）络合剂对上述核素形成配合物的条件。结果表明，在用ＴＢＰ和ＴｉＡＰ作萃取剂时，可用ＤＴＰＡ络合Ｎｐ（Ⅵ）、Ｐｕ（Ⅲ）．从而改善乏燃料后处理中Ｕ产品对Ｎｐ、Ｐｕ和Ｐｕ产品对Ｎｐ的去污。     

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Binary particle swarm optimization with multiple evolutionary strategies

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