Patent ID: 6478902
Filing Date: 2002-11-12
Classification: C22F,C23C

Abstract:
A method of fabricating copper sputter targets comprising the steps of:heating a copper billet to at least about 500Â° C., the copper billet having a purity of at least 99.99 percent; warm working the heated copper billet to apply at least about 40 percent strain; cold rolling the warm worked copper billet to apply at least about 40 percent strain and to form a copper plate; and annealing the copper plate at a temperature above about 250Â° C. to form a target blank, the target blank having equiaxed grains, the grains having an average grain size of less than about 40 &mgr;m and having (111), (200), (220) and (311) orientations with the amount of the grains having each of the orientations being less than about 50 percent.