The effect of gas flow rate on the growth rate of hot-filament CVD dia
mond is reported. With increasing gas flow rate, the growth rate of th
e HFCVD diamond film increases. The crux of increasing the growth rate
of the HFCVD diamond film is to increase the mass flow passing throug
h the filamentary heater region and to increase the quantity of reacti
ve gas mixture reaching the substrate surface per unit time. Eventuall
y the growth rate of 8.67 mu m/h was obtained at the gas flow rate of
800 sccm.