CO_2 LASER-ASSISTED LOCAL DEPOSITION OF DIAMOND FILMS BY COMBUSTION-FLAME METHOD

摘要

Diamond films were synthesized on WC-Co substrates in open air by CO_2 laser-assisted C_2H_2/O_2 combustion-flame deposition. A CO_2 laser was used to irradiate the growth area to create a locally heated zone while the bulk of the substrate was kept at a lower temperature by efficient water cooling. Diamond grains grew with various orientations such as (100) and (111) in laser-induced craters. A sharp diamond peak was observed in Raman spectroscopy indicating high quality of the diamond crystals. Surface morphologies of the deposited films were characterized by scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis so that element distribution on the WC surfaces after deposition was measured simultaneously. Some diamond grains were embedded into the WC-Co substrate surfaces, which was promising to increase adhesion between the deposited films and the substrates. A two-stage approach was developed to deposit dense films without peeling off.