A new closed gas circuit method for diamond chemical vapour deposition
(CVD) has been investigated. On the basis of thermodynamic and kineti
c considerations a carbon reactor has been designed which is able to r
emove undesired products of the CVD process and to replenish the neces
sary gaseous components, particularly methane and carbon monoxide. The
limits of this gas regeneration method with respect to flow rates, pr
essure and temperature are reported and discussed.