The adhesion strength of the sub layer, produced by the HVOF method, changes in the range 61.6-71.0 MPa with failure through the sub layer-parent material interface. According to the experimental results, the cohesion strength is on average 93 MPa. The proposed technology of HVOF deposition of the sub layer of the NiCoCrAlTaI system results in a porosity of 6.4-7.0 percent, hardness 4745-4965 MPa, the surface roughness parameter 4.5-5.0 mum. The deposition of the intermediate layer by the method of atmospheric plasma spraying results in the optimum surface roughness for subsequent deposition of the thermal barrier coating of the ZrO_2-8 percent I_2O_3 system.
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