Characterisation of Oxidised Surfaces
physically and chemically stable. An ideal oxide would not dissociate nor melt at the temperatures and pressures of interest;
mechanically stable. The scale would be capable of maintaining intimate contact with the surface of the metal, particularly when sudden temperature changes occur;
a barrier to diffusion. The function of a protective oxide is to separate the metal from the oxygen in the gas phase. The ideal oxide would, therefore, have a low diffusion rate for both oxygen and metal ions, otherwise the oxidation reaction would proceed at the oxide/metal or oxide/gas interfaces respectively;
continuous and dense. When pores or cracks are present in the oxide scale the protective capabilities of the oxide are lost.
KeywordsCombustion Nickel Chromia Cobalt Milling
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