Patent ID: 6217821
Filing Date: 2001-04-17
Classification: H01B,H01L,H05K

Abstract:
A method of forming a distortion-free circuit comprising the following steps:A. applying a conductive composition to at least one layer of green ceramic tape forming an assemblage wherein the conductive composition comprises, based on total composition:(a) conductive powder selected from Ag, Pd, Pt and mixtures thereof; and(b) 0.5 to 1.5 wt. % boron; wherein a and b are dispersed in organic medium; and wherein the ceramic green tape comprises, based on total composition: (a) 25-50 wt. % glass composition comprising, based on mole %, 50-67% B.sub.2 O.sub.3 ; 20-50% alkaline earth metal oxide; 2-15% rare earth oxide and 0-6% alkali metal oxide and 0-10% Al.sub.2 O.sub.3 ; (b) 50-75 wt. % refractory oxide and (c) organic polymer binder; andB. firing the assemblage to form a distortion-free circuit.