WIRE CONSTITUTED BY PT-IR ALLOYS AND OTHER HARDENED BY DISPERSION OF OXIDES WITH IMPROVED SURFACE FOR THE ELECTRODES OF IGNITION PLUGS.

摘要

Band or wire, which are constituted by an alloy hardened by dispersion of oxides, based on platinum or palladium or a mixture formed by platinum and palladium, the mass ratio of platinum and palladium, in sum, at least 50% by weight and containing one or more oxidizers, which forms either the easily volatile oxides (s), chosen from 0.3 to 50% by weight of iridium, from 0.3 to 30% by weight of ruthenium, from 0.3 to 20% by weight of rhenium, from 0.3 to 10% by weight of tungsten and from 0.3 to 10% by weight of molybdenum, in sum at least 3% and a maximum of 35% characterized (or) because the cross-section of the band or wire has a marginal area, which represents from 0.1 to 5% of the thickness of the band or wire in which it is diluted, at least in a quarter, at least one of these oxidizers, which forms oxides, which are volatile in one Ma relatively simple.