Method of preparation of a sintered alloy based on iron, for a cursor of the pantograph.

摘要

The sintered alloy, in order to manufacture a collector shoe on the bow to the pantograph used on an electric vehicle at high speed of 270 to 350 km / h, is prepared by mixing, as pulverulent materials which are essential, 8 to 25% by weight of elemental chromium (cr), 3 to 9% of a metal sulfide, 0,1 to 4% of boron nitride (bn), 1% or less of phosphorus (p), 3 to 8% of lead (pb) and the remainder of the iron (fe), by molding, this mixture by compression and fritting this mixture is molded in a non - oxidizing or reducing atmosphere. The ability to the compression molding can be improved by increasing the quantities of a metal sulfide and bn contained as a matter of the sintered alloy, without incorporation of lead in the substances. In this way, the lubricating power of the metal sulphide and that of the bn are used as a whole in a range of temperatures of up to 600degré c, and excellent lubricating power of the bn is used in a temperature range of 600 to 1 / p 1000degré c.