Oxidation Kinetics of Microcrystalline K38G Coating

The oxidation kinetics of microcrystalline K38G was compared with that of normal grain K38G at800℃and900℃in air.It was shown that the oxidation rate of microcrys-talline K38G was heavily decreased.The oxidation kinetics of microcrystalline K38G failed to obey the parabolic law.It was suggested that the oxide scale turned into microcrystalline state since the nuclear probability of oxide was extremely increased.The short circuit diffu sion through oxide scale was dominant.An expression,x 4 =k P t,has been derived for the oxidation kinetics of microcrystalline K38G based upon the model of short circuit diffusion.