Patent ID: 6849139
Filing Date: 2005-02-01
Classification: C22C,C23C,Y10T

Abstract:
1. A method of making a sputtering target assembly comprising: providing high purity copper target of at least about 99.999 wt. % purity; preparing a master alloy comprising copper and not more than about 10 ppm of at least one of Ag, Sn, Te, In, Mg, B, Bi, Sb, and P; preparing a cast billet by forming a molten combination of copper and master alloy and solidifying the molten combination; deforming the cast billet for a total of at least about 50% deformation on each axis and then rapidly quenching the deformed billet; frictionless forging the quenced billet at elevated temperature to about 70% of the starting length of the billet, and rapidly quenching; cold rolling to a total of about 90% deformation; providing an aluminum alloy backing plate having a preclad CuCr surface; and precipitation hardening the aluminum alloy backing plate.