The in-situ formation and service behavior of spherical FeNi@SiC magnetic abrasives with core-shell structure
The surface roughness (Ra) of thermal barrier coatings (TBCs) is a critical indicator that significantly influences the service performance of engine blades. Silicon carbide (SiC) shows great potential as the hard phase in magnetic abrasive to reduce roughness. However, challenges remain regarding t...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425002261 |
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| Summary: | The surface roughness (Ra) of thermal barrier coatings (TBCs) is a critical indicator that significantly influences the service performance of engine blades. Silicon carbide (SiC) shows great potential as the hard phase in magnetic abrasive to reduce roughness. However, challenges remain regarding the mechanisms of hard phase damage and the difficulties in preparing SiC-based magnetic abrasives. In this paper, nanoindentation simulation were conducted to investigate the damage to the hard phase (SiC). The results indicate that the material beneath a spherical indenter is prone to failure through the formation of a ring-shaped crack that expands towards the surface. In contrast, a conical indenter behaves similarly to a pyramid indenter, with greater shear strain concentrated at the tip and extending along the sides. Subsequently, spherical FeNi@SiC magnetic abrasives were in-situ prepared using different silicon and carbon sources for magnetic finishing of TBCs. The results demonstrate that SiC phase content on the surface of magnetic abrasive prepared with polycarbosilane (PCS) as the carbon source reached 50.6%. Meanwhile, after 40 min of finishing, the Ra of Gd2Zr2O7 ceramic layers decreased from 8.076 μm to 3.427 μm, and the magnetic abrasives exhibited a good lifespan. The findings of this study can support the development of surface finishing techniques for aero-engine TBCs. |
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| ISSN: | 2238-7854 |