bulk metallic glass matrix composite membranes

SUMMARY A new concept of membrane composed of in-situ �(Ti,Nb,Zr) crystalline phase in Ti-based BMGs matrix has been developed for the separation of hydrogen. The results obtained are s umm arized as follows: (I) By increasing the amount of Niobium represented by x in the composition (Ti4sZr16Be2oCulONi9)lOo_xNbx a dendritic crystalline phase rich in Nb and Ti grows within an amorphous matrix (2) The crystalline Nb-rich phase acts as a path for the fast diffusion of hydrogen. The value of hydrogen permeability was found to be proportional to the volume fraction of the dendritic phase (3) The value of the hydrogen penneability for those amorphous matrix composites are four to five times higher than pure-Pd membranes and other exisiting metallic glasses. (4) The values of the hydrogen permeability for those composites are relatively stable in stable. ACKNOWLEDGMENT We acknowledge the 21 sl Frontier Program CNMT (# 2010K000265) of the Korean Ministry of Education, Science 472 and Technology for the financial support.

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