A COMPARATIVE-STUDY OF LAMINAR AND TURBULENT OXYGEN ACETYLENE FLAMES FOR DIAMOND DEPOSITION

Free-standing polycrystalline diamond films have been deposited using pre-mixed laminar and turbulent oxygen-acetylene flames. The use of new burners which had been developed at CSEM has made it possible to compare the performance of laminar and turbulent oxygen-acetylene flames produced by burners with the same exit opening size using the same total gas flow amount and gas mixing ratio. The quality of the as-deposited films was measured by electron microscopy and Raman spectroscopy. A marked difference in growth rate was observed. Films grown in a turbulent flame grow twice as fast as in the laminar case.