QUASICRYSTALS – NEW TYPE OF MATERIAL TO PREVENT COLD WELDING

摘要

This paper shall presents a survey of a vacuum orspace related effect, which is referred to as 'coldwelding', 'adhesion' or 'sticking' of quasicrystalbulk materials versus different kinds of counterparts(steel, aluminium, titanium, hard metals).Full series of samples, prepared either by crystal-pullingtechniques (single crystals) or by sintering(multi-grain samples), were analysed. Four alloysystems were investigated: Al-Pd-Mn, Al-Cr-Fe-B,Al-Cu-B and Al-Cu-Fe-B, with different nominalcompositions and crystallographic structures. Thesematerials, especially icoshaedral phases, exhibit theabsence of cold-welding in vacuum versus certainsteels.