LOW MELTING IRON BASED BRAZE FILLER METALS FOR HEAT EXCHANGER APPLICATIONS

摘要

Iron-based braze filler alloys having unexpectedly narrow melting temperature ranges, low solidus and low liquidus temperatures, as determined by Differential Scanning Calorimetry (DSC), while exhibiting high temperature corrosion resistance, good wetting, and spreading, without deleterious significant boride formation into the base metal, and that can be brazed below 1,100C contains: a) nickel in an amount of from 0% to 35% by weight, b) chromium in an amount of from 0% to 25% by weight, c) silicon in an amount of from 4% to 9% by weight, d) phosphorous in an amount of from 5% to 11% by weight, e) boron in an amount of from 0% to 1% by weight, and f) the balance being iron, the percentages of a) to f) adding up to 100% by weight. The braze filler alloys or metals have sufficient high temperature corrosion resistance to withstand high temperature conditions of Exhaust Gas Recirculation Coolers.