High Temperature Oxidation of Al-Alloyed SiMo Cast Iron in CO2-Containing Atmospheres

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The SiMo cast iron with 5.45 wt% of Al has been developed for using as an automotive exhaust manifold. Cyclic oxidation test of that alloy and the conventional SiMo cast iron was conducted at 850 oC in 5%CO2+12%O2+83%N2 and 10%CO2+12%O2+78%N2. It was found that oxidation kinetics of the SiMo cast iron alloyed with 5.45 wt% of Al was lower than that of the SiMo cast iron. An X-ray diffraction technique and a scanning electron microscope equipped with energy dispersive spectroscopy were performed for characterisation. Thermal oxide scale on the SiMo cast iron consisted of hematite, magnetite and silica, while it was mainly alumina, additionally with hematite and magnetite, for the SiMo cast iron alloyed with 5.4 wt%. Formation of the alumina promoted oxidation resistance of the later cast alloy.

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132-135

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September 2013

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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