This study of the resistance to contact fatigue of Ni-5%Al alloy coatings and Ni-5%Al-15%Al2O3 composite
coatings were evaluated. The coatings were prepared by flame spraying (Casto-Dyn DS 8000 torch) and plasma
spraying (PN 120 plasma jet). The coatings were subjected to a finishing treatment: turning, burnishing and grinding.
Depending on coatings phase composition and finishing treatment, the parameter mean values of surface roughness
(Ra) were in the wide range of 0.28 to 2.61 m. The coatings after burnishing characterized by smallest of surface
roughness. The largest value of the parameter Ra was observed in the case of coatings after turning. The presence of
the reinforcing phase in the coating increases the surface roughness of thermally sprayed composite coatings. The
hardness of coatings also depends on the finishing methods. The minimum hardness equal to 192 HV2 was found in
the case of coatings of Ni-5%Al obtained by using a Casto-Dyn DS 8000 gas torch. Burnished Ni-5%Al-15%Al2O3
coatings obtained by plasma spraying characterized by hardness 291 HV2.
Resistance of fatigue surface of thermally sprayed coatings on a SCF (standing contact fatigue) test stand was
assessed. The test was designed based on the guidelines of the PN-80/H-04324 Polish standard. During the fatigue
tests were provided constant contact of co-acting parts, without slipping.
Based on the survey it was found that the plasma sprayed coatings (PN120 plasma-jet) have a greater resistance
to fatigue then the coatings obtained by flame spraying Casto-Dyn DS 8000 torch. Composite coatings of Ni-5%Al-
15%Al2O3 are more resistant to contact fatigue, compared to the alloy coatings of Ni-5%Al. Burnishing increases the
fatigue resistance of coatings when compared to turning. Burnished and polished surfaces are characterized by
a similar contact fatigue resistance.
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