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Publikacje Pracowników Politechniki Lubelskiej

Status:
Autorzy: Jonda Ewa, Łatka Leszek, Szala Mirosław, Walczak Mariusz
Dyscypliny:
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Wersja dokumentu: Elektroniczna
Język: angielski
Strony: 91 - 91
Efekt badań statutowych NIE
Materiał konferencyjny: NIE
Publikacja OA: TAK
Licencja:
Sposób udostępnienia: Witryna wydawcy
Wersja tekstu: Ostateczna wersja opublikowana
Czas opublikowania: W momencie opublikowania
Data opublikowania w OA: 28 maja 2021
Abstrakty: angielski
In this paper, the comparision of tribological properties such as wear and cavitation erosion resistance of High Velocity Oxy Fuel (HVOF) sprayed coatings onto AZ31 magnesium alloy were examined. As a coating material, three commercially available powders: WC-Co-Cr, WCCo and WC-Cr3C2-Ni were used. The manufactured coatings were analyzed extensively using optical microscopy (OM), X - ray diffraction (XRD) and scanning electron microscopy (SEM), respectively. In the case of mechanical properties, the hardness, microhardness, elastic modulus and fracture toughness were measured. Cavitation erosion tests were conducted according to ASTM G32 with the stationary specimen method. Dry sliding wear tests were conducted using WC counter sample according to ASTM standard. In both tests, the results were compared with the AZ31 magnesium references sample. Cavitation tests indicate that in the initial stages of erosion the WC-Co-Cr sample has slightly higher resistance than WC-Cr3C2-Ni and far better cavitation resistance than WC-Co coatings. In further stages of erosion, the Ni-containing coating delaminates due to its lower fracture resistance and WC-Co-Cr sample stays solid until the end of test time. As-sprayed samples exhibit accelerated mass loss. The main wear mechanism resiles on the detachment of cermet material starting at microstructural and surface nonuniformities such as pores and ceramic-metallic phase interfaces. In the case of sliding wear, the results are strongly related to the mechanical properties. The WC-Co and WC-Co-Cr samples hardness, Young modulus exceed the WC-Cr3C2- Ni, therefore, presents lower values of wear factor, on the level of approximately 6·10-7 mm3/N·m and coefficient of friction related to 0.4. The wear mechanism is affected by abrasion, growing and transfer of the material between counterball and coatings. Deposition of the cermet coatings effectively prevents the magnesium substrate which is presented very poor resistance to cavitation and sliding wear.