THE BEHAVIOR OF THE CARBON IN THE SUBSTRATE DURING DEPOSITING DIAMOND FILM BY COMBUSTION FLAME

The diamond films were deposital on the Mo substrates by combustion name in air. The behavior of the carbon was investigated during depositing diamond films. The results show that firstlly the carbon atoms are absorbed on the surface of the substrate, secondlly the carbon atoms diffuse into the substrate and react with Mo to form Mo2C, finally the Mo2C layer becomes more thick with increasing time, then the diffusing rate of carbon atoms in the substrate becomes lower so that the diamond nucleation takes place because the carbon atoms is oversaturated.