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Keywords = polycrystalline Fe/Si multilayer

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27 pages, 10540 KiB  
Article
Self-Lubricating Effect of WC/Y–TZP–Al2O3 Hybrid Ceramic–Matrix Composites with Dispersed Hadfield Steel Particles during High-Speed Sliding against an HSS Disk
by Nickolai Savchenko, Irina Sevostyanova, Mikhail Grigoriev, Tatiana Sablina, Ales Buyakov, Maxim Rudmin, Andrey Vorontsov, Evgeny Moskvichev, Valery Rubtsov and Sergei Tarasov
Lubricants 2022, 10(7), 140; https://doi.org/10.3390/lubricants10070140 - 4 Jul 2022
Cited by 7 | Viewed by 2945
Abstract
WC/Y–TZP–Al2O3 hybrid ceramic–matrix composites (CMCs) with dispersed Hadfield steel particles were sintered and then tested at sliding speeds in the range of 7–37 m/s and contact pressure 5 MPa. Fast and low-temperature sinter-forging allowed obtaining micron-sized WC grains, submicron-sized alumina-reinforced [...] Read more.
WC/Y–TZP–Al2O3 hybrid ceramic–matrix composites (CMCs) with dispersed Hadfield steel particles were sintered and then tested at sliding speeds in the range of 7–37 m/s and contact pressure 5 MPa. Fast and low-temperature sinter-forging allowed obtaining micron-sized WC grains, submicron-sized alumina-reinforced yttria partially stabilized polycrystalline tetragonal zirconia (Y–TZP–Al2O3), and evenly distributed Hadfield steel grains. Such a microstructure provided new hybrid characteristics combining high hardness with high fracture toughness and tribological adaptation. The CMCs demonstrated low friction and high wear resistance that were better than those demonstrated by other composite materials such as, for example, MAX-phase composites, zirconia-base ceramics, ZrB2-SiC ceramics, and metal matrix WC–(Fe–Mn–C) composites. These good tribological characteristics were obtained due to the in situ mechanochemical formation of iron tungstates FeWO4 and Fe2WO6 on the worn surfaces of composite samples. These mixed oxides were included in multilayer subsurface structures that provided the self-lubricating and self-healing effects in high-speed sliding because of their easy shear and quasi-viscous behavior. Full article
(This article belongs to the Special Issue Friction and Wear in Composite Materials)
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13 pages, 837 KiB  
Article
Coherent Magnetization Rotation of a Layered System Observed by Polarized Neutron Scattering under Grazing Incidence Geometry
by Ryuji Maruyama, Thierry Bigault, Thomas Saerbeck, Dirk Honecker, Kazuhiko Soyama and Pierre Courtois
Crystals 2019, 9(8), 383; https://doi.org/10.3390/cryst9080383 - 26 Jul 2019
Cited by 8 | Viewed by 3757
Abstract
The in-plane magnetic structure of a layered system composed of polycrystalline grains smaller than the ferromagnetic exchange length was studied to elucidate the mechanism controlling the magnetic properties considerably different from the bulk using polarized neutron scattering under grazing incidence geometry. The measured [...] Read more.
The in-plane magnetic structure of a layered system composed of polycrystalline grains smaller than the ferromagnetic exchange length was studied to elucidate the mechanism controlling the magnetic properties considerably different from the bulk using polarized neutron scattering under grazing incidence geometry. The measured result, together with quantitative analysis based on the distorted wave Born approximation, showed that the in-plane length of the area with a uniform orientation of moments ranging from 0.5–1.1 μ m was not significantly varied during the process of demagnetization followed by remagnetization. The obtained behavior of moments is in good agreement with the two-dimensional random anisotropy model where coherent magnetization rotation is dominant. Full article
(This article belongs to the Special Issue Investigation of Nanostructures with X-ray Scattering Techniques)
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