Cavitation Erosion and Sliding Wear of MCrAlY and NiCrMo Coatings Deposited by HVOF Thermal Spraying

Abstract

<jats:title>Abstract</jats:title><jats:p>The investigation into wear resistance is an up-to-date problem from the point of view of both scientific and engineering practice. In this study, HVOF coatings such as MCrAlY (CoNiCrAlY and NiCoCrAlY) and NiCrMo were deposited on AISI 310 (X15CrNi25-20) stainless steel substrates. The microstructural properties and surface morphology of the as-sprayed coatings were examined. Cavitation erosion tests were conducted using the vibratory method in accordance with the ASTM G32 standard. Sliding wear was examined with the use of a ball-on-disc tribometer, and friction coefficients were measured. The sliding and cavitation wear mechanisms were identified with the SEM-EDS method. In comparison to the NiCrMo coating, the MCrAlY coatings have lower wear resistance. The cavitation erosion resistance of the as-sprayed M(Co,Ni)CrAlY coatings is almost two times lower than that of the as-sprayed NiCrMoFeCo deposit. Moreover, the sliding wear resistance increases with increasing the nickel content as follows: CoNiCrAlY &lt; NiCoCrAlY &lt; NiCrMoFeCo. The mean friction coefficient of CoNiCrAlY coating equals of 0.873, which almost 50% exceed those reported for coating NiCrMoFeCo of 0.573. The as-sprayed NiCrMoFeCo coating presents superior sliding wear and cavitation erosion resistance to the as-sprayed MCrAlY (CoNiCrAlY and NiCoCrAlY) coatings.</jats:p>

Comparative Analysis of Mechanical Properties of WC-based Cermet Coatings Sprayed by HVOF onto AZ31 Magnesium Alloy Substrates

“…Relatively new and not deep investigated group of the substrate are light metal alloys. A proposed in this paper, AZ31 magnesium alloy with poor mechanical properties could be a good candidate for novel type of substrate for HVOF spraying [28][29][30].…”

Mechanical Properties and Sliding Wear Resistance of Suspension Plasma Sprayed YSZ Coatings

“…Summing up, the results given in Table 3 indicate a relatively high wear resistance of both YSZ coatings. In comparison to the recent results reported by our research group [39][40][41][42][43][44][45] for metallic materials, coatings and surface treatments, the overall wear resistance of the YSZ coatings can be classified as comparable to the alumina-based ceramic coating, rather than bulk metal alloys, composite coatings or metallic coatings. On the other hand, it is to be mentioned that similar results were obtained for typically submicrometric coatings, also with yttria stabilised zirconia oxide as the output material, but with the grain size c.a.…”

Neural Modelling of APS Thermal Spray Process Parameters for Optimising the Hardness, Porosity and Cavitation Erosion Resistance of Al₂O₃ -13% TiO₂ Coatings

“…partly melted particles) and the spallation of splat-edges. This effect can be observed not only for ceramic coatings but also for HVOF nickel-and cobalt-based coatings and cold-sprayed MMC [32,43]. The lowest erosion rate is observed for the AT13-3 coating (Figure 3a) and results from the low porosity of the coating and is a result of spraying parameters: h = 90 mm and V = 400 m/s, see Table 2.…”

“…The hardness H (HV0.1) and porosity P (%) of the coatings were evaluated according to the procedures described in our previous papers [43][44][45] while obtained results were discussed in detail in [40]. Cavitation erosion resistance (CER) tests were conducted according to the ASTM G32 standard [46] using the vibratory test rig described in [32,40].…”