Hot Corrosion and Oxidation Behavior of Ti-Al/Al2O3 Composites Prepared from Combustion Synthesis Method

Oxidation & hot corrosion behavior of Ti-Al/Al2O3 composites produced by combustion synthesis method with different conditions of production (exposed to salt coating Na2S 4),was studied in air at 800°C. Electron microscopy and X-ray diffraction (XRD) tests were used to study the morphology and compositions of the corrosion products. The hot corrosion kinetics approximately follows a parabolic rate law. In the samples exposed to salt, holes and severe corrosion attack were observed. The oxide scales formed on the composites were predominantly rutile and Al2O3. Addition of more aluminum in the produced composites leads to a reduction in oxide scale thickness, i.e. the oxidation resistance of the oxide scale has generally improved.