Patent ID: 6092714
Filing Date: 2000-07-25
Classification: B23K,H05K

Abstract:
A method for cleaning, de-oxidizing and coating a conductor for dry soldering attachment utilizing a plasma gas mixture containing carbon Tetrafloride (CF.sub.4) and Argon (Ar) gases in a vacuum including the following steps:positioning a component within a plasma chamber;sealing the plasma chamber;providing a first atmosphere within the plasma chamber with a first plasma gas mixture ratio of substantially 60 CF.sub.4 :10 Ar and a first negative pressure in the range of 275-325 m torr;generating a plasma within the plasma chamber, the plasma having a first output power in the range of 525-575 watts for a first period of time in the range of 2-3 minutes;providing a second atmosphere within the plasma chamber with a second plasma gas mixture ratio of substantially 20 CF.sub.4 :10 Ar and a second negative pressure in the range of 175-275 m torr;generating a plasma within the plasma chamber, the plasma having a second output power in the range of 375-425 watts for a second period of time in the range of 2.5-3.5 minutes;providing a third atmosphere within the plasma chamber with a third plasma gas mixture ratio of substantially 10 CF.sub.4 :30 O.sub.2 and a third negative pressure in the range of 175-250 m torr;generating a plasma within the plasma chamber, the plasma having a third output power in the range of 325-375 watts for a third period of time in the range of 1.5-2.5 minutes; andPA