Improving wear resistance of plasma-sprayed calcia and magnesia-stabilized zirconia mixed coating: roles of phase stability and microstructure
| Autor: | Ali Saeid Khalil, Sameh Ahmed Akila, Mohamed Atta Khedr, Mohamed Abd-Elsattar Hafez |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Science Oxide 02 engineering and technology engineering.material 01 natural sciences Indentation hardness Article chemistry.chemical_compound Coating 0103 physical sciences Cubic zirconia Ceramic Composite material Thermal spraying 010302 applied physics Multidisciplinary Physics 021001 nanoscience & nanotechnology Microstructure chemistry visual_art engineering visual_art.visual_art_medium Medicine 0210 nano-technology Layer (electronics) |
| Zdroj: | Scientific Reports Scientific Reports, Vol 10, Iss 1, Pp 1-14 (2020) |
| ISSN: | 2045-2322 |
| DOI: | 10.1038/s41598-020-78088-6 |
| Popis: | The phase stability and microstructure of ZrO2–5CaO and ZrO2–24MgO mixed coating (wt%) by air plasma spraying on 304 stainless steel substrates were investigated. A Ni–5Al (wt%) metallic bond coating was firstly sprayed between the substrate and the ceramic top layer. The results were compared with the individual coatings of ZrO2–5CaO and ZrO2–24MgO for a better understanding of the correlation between their microstructures and mechanical properties. Mixed zirconia coating was found to have a mixture of cubic and tetragonal phases that stabilized under different plasma spray conditions. Microscopic observations and elemental composition analysis of as-sprayed mixed coating showed that modified ceramic-matrix grains had been formed. Microsized ZrO2–5CaO particles were embedded in the matrix grain creating an intragranular microstructure. Results indicated that ceramic-matrix grains provided a diffusion barrier for the growth of oxides induced stress near and onto the bond layer that reduced cracks, thereby overcoming the top delamination of the ceramic coating. Moreover, disparity in wear resistance and microhardness behavior of the coatings was influenced by initial feedstock powder and matrix microstructures. Improvement in the wear resistance of the mixed zirconia coating was attributed to a decrease in oxide content, which resulted in an increase in intersplat cohesive strength. |
| Databáze: | OpenAIRE |
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