Abstract
The aim of the present study is to investigate the beneficial influence of an yttrium sol–gel coating on a chromia forming alloy (304 stainless steel), in air, at 1000°C. Thermal cyclic experiments were carried out in order to study the influence of the addition of yttriumon the scale adherence. The yttrium sol–gel coating plays a significant role in enhancing oxidation resistance during isothermal oxidation tests, decreasing specimen weight gain and suppressing the initial transient oxidation stage. Yttrium addition appears to promote silicon segregationat the metal/oxide interface. It is then observed that iron containing oxides are not formed. Under thermal cycling conditions, the addition of yttrium also remarkably improves oxide scale adherence.
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