MCrAlX (X= Y, Hf and Si) Bond Coats by Cold Spray for High Temperature Applications
We present high-pressure CS deposition of CoNiCrAlY, NiCoCrAlY and NiCoCrAlYHfSi and discuss the influence of powder properties on the deposited BCs. CFD numerical simulation is employed to tailor the spray conditions based on the feedstock characteristics. Secondly, we present the laser assisted cold spray (LACS) of NiCoCrAlYHfSi using a low-pressure CS system. We show that LACS can be successfully used to deposit this particular powder while eliminating nozzle erosion and low deposition efficiency disadvantages observed during conventional CS.
Lastly, high temperature isothermal and cyclic oxidation of TBC architectures having CS BCs are presented. Their performance is discussed in conjunction with the TGO growth and the effect of the BCs surface roughness on adhesion to the air plasma spray (APS) deposited YSZ ceramic top coats.