Patent ID: 6284013
Filing Date: 2001-09-04
Classification: B22F,C22B,C23C

Abstract:
A method for manufacturing a high-purity ruthenium sputtering target comprising the steps of:feeding crude ruthenium powder into a sodium hydroxide solution;blowing an ozone-containing gas and blowing chlorine gas into said sodium hydroxide solution which was fed with crude ruthenim powder to form ruthenium tetroxide;absorbing said ruthenium tetroxide in a solution selected from the group consisting of a hydrochloric acid solution and a mixed solution of hydrochloric acid and ammonium chloride;evaporating said solution which has absorbed said ruthenium tetroxide to dryness to form a resultant ruthenium salt;sintering the resultant ruthenium salt in a hydrogen atmosphere to form high-purity ruthenium powder; andhot-pressing said high-purity ruthenium powder into a sputtering target.