パラジウム系水素透過合金膜の耐久性に及ぼす周期表第5族および第6族金属の添加効果

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タイトル別名
  • Alloying Effects of Group 5 and 6 Metals on the Durability for Palladium Based Hydrogen Permeable Membrane
  • パラジウムケイ スイソ トウカ ゴウキンマク ノ タイキュウセイ ニ オヨボス シュウキヒョウ ダイ5ゾク オヨビ ダイ6ゾク キンゾク ノ テンカ コウカ

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抄録

  The alloying effects of group 5 and 6 metals on the durability for Pd-based hydrogen permeable membranes are investigated systematically. The surface defects, so called Kirkendall voids, that cause a gas leakage, are formed around iron particles adhered on the Pd-based metal membrane during hydrogen permeation reaction. It is found that the formation of these surface defects are inhibited by the addition of only 1 mol% of group 5 or 6 metals into palladium in hydrogen atmosphere at less than 873 K. The growth rate of the crystal grain of Pd-20 mol%Ag-1 mol%W alloy is slower than Pd-22 mol%Ag alloy at 973 K, indicating that the inter-diffusion of metal atoms is delayed by the addition of tungsten into palladium. The vacancy formation energies of metals increase almost linearly with their melting temperatures. Thus, it can be understood that the improvement of the durability against the iron particles may attributable to the decrement of the inter-diffusion rate through the modification of the vacancy formation energy by the addition of group 5 or 6 metals into palladium.<br>

収録刊行物

  • 日本金属学会誌

    日本金属学会誌 76 (10), 607-613, 2012

    公益社団法人 日本金属学会

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