Abstract
High purity diamond film has been grown by refined Combustion Flame method with high oxygen proportion. Snapshots of time series of the diamond film forming were taken and a model was derived. By observing the period of seeding to coalescing of diamond crystals to form film, it is realized that the contacting area is small and the calculated value was less than 15%. It is also found that the base layer of the film was porous as a result of non-uniform crystal growth. To enhance adhesion of the film, the contacting area between the film and the substrate must be increased, and the porous base layer must be thin and dense as much as possible. To achieve that, very high and uniform nucleation is the key. Under this view, the nanocrystalline diamond film on smooth substrate is preferred than rough surface to have strong adhesion.
Highlights
Diamond possesses a combination of extreme properties, such as highest hardness, very low friction coefficient and highest thermal conductivity
As one of Chemical vapor deposition (CVD), Combustion Flame methods deposit diamond at high rates, but often only over very small localized areas and with poor process control resulting in poor quality films
The quality of the films by Combustion Flame methods could be improved and the acceptable quality diamond film could be produced for applications such as an abrasive and coating on cutting tool inserts, drill bits, borer, milling cutter, etc
Summary
Diamond possesses a combination of extreme properties, such as highest hardness, very low friction coefficient and highest thermal conductivity. Mechanical or chemical pretreatments, interlayers or combinations of these methods are applied to improve nucleation and adhesion strength[3,4,5,6,7]. All of these techniques are related to the final film structure which determined the adhesion strength. The aim of this study was to employ improved high-oxygen combustion flame to produce high quality diamond film on the surface of WC-Co, which was pretreated for high nucleation, to investigate the formation of the film step by step and to identify any aspects of the film that could be improved to increase the adhesion of the diamond film
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