Microstructure evolution and oxidation/ablation behaviors of NbSi2/Nb2O5-SiO2/HfC-HfO2 multilayer protective coating at 1200 °C and 1800 °C
Source abstract
Abstract
In this study, the LPDS-coating charactered by the volcanic-like surface with micropores is synthetized on Nb alloys through halide activated pack cementation (HAPC) combined with a liquid-plasma-assisted particle deposition and sintering (LPDS) technology. Results show that the mass gain of NbSi 2/Nb 2O 5-SiO 2/HfC-HfO 2 coated sample (6.38 mg/cm 2) is only 46% compared to NbSi 2 coated sample (13.8 mg/cm 2 ) and holds the lowest oxidation rate (0.367 mg 2·cm −4·h −1 ) during the isothermal oxidation process after 100 h at 1200°C. Besides, this multilayer coating also exhibits an enhanced oxyacetylene ablation resistance (the lowest mass ablation rate of −0.106 mg/s and a linear ablation rate of −0.333 μm/s) compared with NbSi 2 coating and NbSi 2/Nb 2O 5-SiO 2 coating. Such superior high-temperature oxidation/oxyacetylene ablation resistance of multilayer coating are mainly ascribed to HfC oxygen-consuming phase combined with the oxide scale’s high-temperature stability provided by the HfSiO 4-HfO 2-SiO 2 skeleton.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Intermetallics and Advanced Alloy Properties · Advanced ceramic materials synthesis · Metal and Thin Film Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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