Purpose - The paper aims to focus on lowering the soldering temperature of ionic compound free soldering using 9,10-dihydroanthracene as a hydrocarbon flux.
Design/methodology/approach - The ability of 9,10-dihydroanthracene to reduce cupric oxide in the presence of peroxides including tert-butyl peroxybenzoate, tertbutyl cumyl peroxide, tertbutyl peroxide was investigated. The applicability of 9,10-dihydroanthracene in the presence of peroxides as ionic compound free flux reagents was experimentally examined in the soldering of pre-oxidized copper electrodes under practical conditions.
Findings - The ability of 9,10-dihydroanthracene for the reduction of cupric oxide powder under argon atmosphere at 300 degrees C for 120 s was found to be improved in the presence of tert-butyl peroxybenzoate. The highest reducing ability of 9,10-dihydroanthracene in the presence of tertbutyl peroxybenzoate among the peroxides was in agreement with the lowest homolytical O-O bond dissociation energies of the peroxides calculated by the theoretical calculation. 9,10-Dihydroanthracene in the presence of tert butyl peroxybenzoate showed the highest soldering efficiency under practical conditions (soldering temperature: 300 degrees C) and sufficient reliability in the environmental testing.
Originality/value - The findings demonstrate that peroxide additives improve the applicability of 9,10-dihydroanthracene as ion free soldering even under practical conditions.