Effects of Ce and Si Additions to CoNiCrAlY Bond Coat Materials on Oxidation Behavior and Crack Propagation of Thermal Barrier Coatings

Non-parabolic isothermal oxidation kinetics of low pressure plasma sprayed MCrAlY bond coat

“…In TBC systems, a stable, continuous, and slow growing TGO layer is optimal, as it can increase the oxidation resistance of the bond coat. The TGO layer is mainly made up of α-Al 2 O 3 and mixed oxides (Cr 2 O 3 , NiO, and (Ni,Co)(Cr,Al) 2 O 4 spinel) [5,26]. The depletion of Al in bond coat is one of the main reasons for the formation of the mixed oxides [26][27][28][29].…”

Comparative study on oxidation behavior of selected MCrAlY coatings by elemental concentration profile analysis

“…7 (light gray regions, referred as point 2). These mixed oxides consist of Co-Ni-Cr-Al-O oxide system, i.e., NiO, CoO, Cr 2 O 3 , (Ni, Co)(Cr, Al) 2 O 4 , and so on [11]. All of the coatings appeared to be adhered to the substrate, although many microcracks were observed.…”

High Temperature Corrosion of CoNiCrAlY-Si Alloys in an Air-Na<SUB>2</SUB>SO<SUB>4</SUB>-NaCl Gas Atmosphere

“…[8][9][10] Several works on the addition of small amounts of Si ( 2 mass%) have been carried out by some researchers to improve the properties of MCrAlY coating. [11][12][13][14][15][16][17][18][19] In this study, the addition of Si of up to 30 mass% to CoNiCrAlY was considered in order to form a SiO 2 scale or a SiO 2 based multi-system scale and to develop a corrosion resistant alloy for coating applications. The high temperature corrosion behavior of CoNiCrAlY-Si alloys was investigated and the results are discussed here.…”