科研之友
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摘要
A method is developed to electrodeposit nanostructured yttria-stabilized zirconia (YSZ) as thermal barrier ceramic coating on In.738LC Ni base superalloy substrate. The microstructure of the deposit and its oxidation resistance were investigated in detail in the present study. The first step was to applying an incipient conversion coating from an acidic solution in order to improve the coating adhesion. The deposition was performed in an aqueous solution containing yttrium and zirconium soluble salts as well as potassium chloride. Oxidation resistance of the specimens was tested at 1000 degrees C through a cyclic voltammetry method. The surface morphology and cross section of specimens were examined by a scanning electron microscope. According to the obtained results, it was concluded that nanostructured YSZ coating can obtained by electrochemical synthesis with better oxidation resistance compared to the conventional coatings. This was attributed to the formation of the ultrafine and compact structures. Meanwhile, homogenous distribution of micro-pores which was observed within the coating might have also affected the oxidation phenomenon.
- 出版日期2015-12
