Patent ID: 6521018
Filing Date: 2003-02-18
Classification: B22D,C22B

Abstract:
In a method of processing a nonferrous metal and alloys of said metal using a blanketing gas having a global warming potential, the improvement comprising reducing said global warming potential of said blanketing gas by blanketing said nonferrous metal and alloys with a gaseous mixture including at least one compound selected from the group consisting of COF2, CF3COF, (OF3)2CO, F3COF, F2C(OF)2, SO2 F2, NF3, SO2ClF, SOF2, SOF4, NOF, F2 and SF4, wherein said nonferrous metal and alloys have a temperature of at least about 0.5Ã—Tmelt in degrees Kelvin, wherein said temperature is greater than a solidus temperature of said metal and alloys but less than a liquidus temperature of said metal and alloys.