RESEARCH OF WETTABILITY OF IN SOLDER ON AL2O3 CERAMIC DURING LASER BEAM HEATING.

The work deals with investigation of wettability of In solder on Al2O3 ceramic substrate heated by laser beam. The soldering process was realized withou using od flux. Designed laser beam power was 1.1 kW and 0.5 kW. The In solder of high purity of 5 N was used for soldering. Wettability of solder on substrate, microstructure of joints and EDX analysis on interface were evaluated. Satisfying value of wettability was observed only with power of laser beam 1.1 kW. Lower power due to the high surface tension not allowing connection with a satisfactory value of wettability. Observation of microstructure confirmed the creation of reaction zone on joint boundary. EDX analysis identified the phase boundary witch is composed of mixture of Al + In and InO2. [ABSTRACT FROM AUTHOR]