Patent ID: 8062440
Filing Date: 2011-11-22
Classification: C22C,C23C,H01L,Y10S

Abstract:
1. A method of manufacturing a hafnium alloy target, comprising the steps of hot forging and rolling an ingot or billet of hafnium alloy and thereafter heating said ingot or billet to 800-1300° C. for at least 15 minutes in an atmosphere, a vacuum, or an inert gas atmosphere, said rolling step is hot rolling or cold rolling, and said target is produced such that said target contains at least one of Zr and Ti in a gross amount of 100 wtppm-10 wt % in Hf and has a habit plane ratio of a plane {002} and of three planes {103}, {014} and {015} lying within 35° from {002} of at least 55%, a variation in a total sum of intensity ratios of these four planes depending on locations of 20% or less, an average crystal grain size of 1-100 μm, impurities of Fe, Cr and Ni of 1 wtppm or less, respectively, and an average roughness Ra of an erosion face of said target of 0.01-2 μm.