Preparation of graphite-dispersed copper composite with irradiation of CO2 laser to graphite fixed by waterglass on copper plate

Carbon dioxide laser was irradiated on the graphite particles adhered on a copper plate through waterglass in order to prepare graphite-dispersed copper composite on a surface of a copper plate. The particles which were not removed with ultrasonic cleaning were judged to be adhered on the copper. The graphite particles at the laser spot were heated with the laser ablation, and these particles adhered on the copper plate. This originates in that wettability between graphite and molten copper was improved at a higher temperature by the laser heating. The carbon content at the laser spot decreased with the increase in the laser irradiation time, because the graphite particles at the laser spot were removed by the laser trapping. The electric resistance reduced to around 1 Ω. The graphite particles at the outside of the laser spot adhered on the copper plate through the waterglass by conduction heat from the laser spot. The particles were eliminated by the ultrasonic cleaning during insufficient heat hardenin...