抄録
Carbon felt is composed of carbon fibers and, when calcined at high temperatures in the vicinity of 2000
°C or above, exhibits specific properties, including a large specific area, low electrical resistance and high
microwave absorptivity. Recently, it was found that irradiation of a pair of disc-like carbon felts arranged in
parallel with a ceramic ring spacer by 2.45 GHz microwaves (MW) under atmosphere air generates a thermal
discharge plasma, termed a carbon felt atmospheric pressure microwave plasma (CAMP), at the gap between
the felts. The temperature of the gap increases rapidly to reach thermal equilibrium at 1200 °C or higher in
approximately 20 seconds, although the temperature at the circumference of felts can be as low as 200 °C 1).
In the present study, the surface nitriding and oxynitridation of titanium by CAMP under atmospheric
pressure nitrogen were successfully performed using carbon felts as a MW absorbing material. In addition,
the formation of hydroxyapatite (HAp) by surface contact with a simulated body fluid (SBF) was assessed.
The resulting surfaces of the titanium substrates were analyzed by X-ray photoelectron spectroscopy, X-ray
diffraction and scanning electron microscopy.
