Abstract
The carbon absorption of tungsten filament in hot-filament method was mainly studied in relation to the amount of diamond deposition on WC-Co substrate. The newly.used tungsten filament absorbed the carbon in the mixed gas of CH4 plus H2 at the initial stage of deposition treatment, so that the incubation period for the deposition, which was varied according to the CH4 concentration in a mixed gas, appeared. It was suggested that pre-carburizing treatment of tungsten filament in a gas having higher CH4 content was effective in order to stably deposit the diamond. Diamond was deposited also by passing hydrogen gas only through the pre-carburized filament.
