Thermal stability and oxidation behavior of nanostructured NiCoCrAlY coatings

Microstructural and morphological evaluation of MCrAlY/YSZ composite produced by mechanical alloying method

“…Some researchers showed that the utilization of nanostructured powders as thermal spraying feedstock could greatly improve oxidation properties of MCrAlY coatings [13][14][15]. The improved oxidation resistance can be attributed to two main factors: (1) nanocrystalline powders will accelerate the nucleation and growth of uniform ␣-Al 2 O 3 layer.…”

The effect of heat treatment and thermal spray processes on the grain growth of nanostructured composite CoNiCrAlY/YSZ powders

“…In this case, it seemed that the effective recovery or grain growth happened in some samples. Mercier et al showed that in MCrAlY powders, complete stress relaxation of the milled powder happened at an annealing temperature above 0.3 T m (T m is the absolute melting temperature) [30]. The melting temperature range of MCrAlY coatings was 1623-1723 ºK.…”

Microstructure and oxidation resistance of cryomilled NiCrAlY coating by laser induction hybrid rapid cladding

“…Summing up the published results [6][7][8][9][10][11][12]21], it is found that MCrAlY coating is usually produced by atmospheric plasma spraying, vacuum plasma spraying and HVOF spraying. Compared to thermal spraying techniques, laser cladding can produce MCrAlY coating with low dilution, high density, metallurgical bonding to substrate and fine dendrites.…”

“…To overcome this problem, the thermal barrier coatings (TBCs) typically consisting of a ceramic top coat and a metallic bond coat are usually adopted to extend the life of gas turbine engines [3][4][5]. Generally, MCrAlY (M = Ni, Co and NiCo) alloy is used as bond coat in TBCs to limit the oxidation and to reduce the mismatch in thermo-physical properties between ceramic top coat and Ni-based superalloy substrate, due to the superior oxidation and corrosion resistance [6].…”

“…Especially, when NiCrAlY powder is processed by high-energy milling, the oxidation resistance of cryomilled NiCrAlY coating produced by HVOF spraying has been improved significantly, which has received extensive attention [6,12,20]. The reason is that the cryomilling process is used to produce nanocrystalline NiCrAlY powder and subsequently the nanostructured NiCrAlY coating can be obtained by HOVF spraying [20].…”