QUASICRYSTALS - NEW TYPE OF MATERIAL TO PREVENT COLD WELDING

摘要

This paper shall presents a survey of a vacuum or space related effect, which is referred to as "cold welding", "adhesion" or "sticking" of quasicrystal bulk materials versus different kinds of counterparts (steel, aluminium, titanium, hard metals). Full series of samples, prepared either by crystal-pulling techniques (single crystals) or by sintering (multi-grain samples), were analysed. Four alloy systems were investigated: Al-Pd-Mn, Al-Cr-Fe-B, Al-Cu-B and Al-Cu-Fe-B, with different nominal compositions and crystallographic structures. These materials, especially icoshaedral phases, exhibit the absence of cold-welding in vacuum versus certain steels.