Patent ID: 8674262
Filing Date: 2014-03-18
Classification: C23C,H03K

Abstract:
1. A method of depositing electrically conductive electrode material onto a top surface of an electrically conductive work piece comprising: applying three current pulses between the electrically conductive electrode material and the top surface of the electrically conductive work piece; pausing between a first current pulse and a second current pulse for a duration no less than twice the duration of the first current pulse to ensure that any molten metal mass has re-crystallized and for a duration of no more than five times the duration of the first current pulse to prevent irregularities on the top surface of the electrically conductive work piece to solidify; and pausing between the second current pulse and a third current pulse for a duration no less than twice the duration of the second current pulse to ensure that any molten metal mass has re-crystallized and for a duration of no more than five times the duration of the second current pulse to prevent irregularities on the top surface of the electrically conductive work piece to solidify, wherein the first current pulse has a first amplitude, the second current pulse has a second amplitude, and the third current pulse has a third amplitude, and wherein the first amplitude is greater than the second amplitude and the third amplitude such that main mass transfer takes place when the first current pulse passes from the conductive electrode material onto the top surface of the electrically conductive work piece, thereby forming a layer of material onto the to surface of the electrically conductive work piece, and the second current pulse and the third current pulse produce electrospark smoothening of the roughness in the layer which is formed by the first current pulse.