The Influence of the Axial Rub Added in the Radial Rub on the Wear of the Seal Fins during the High Speed Rub of Labyrinth-Honeycomb Seal
Abstract
:1. Introduction
2. Materials and Methods
2.1. Test Rig
2.2. Test Samples
2.3. Test Procedure
2.4. Test Parameters
3. Results
3.1. The Rubbing Forces, Temperature, and the Wear Rate at Different Axial Incursion Rates
3.2. The Worn Morphology of the Seal Fins
3.3. The Cross-Sectional Morphology of the Seal Fin
3.4. EDS Results
4. Discussion
5. Conclusions
- The maximum rubbing radial force, axial force, and the temperature increase with the axial incursion rate. When the axial incursion rate is high (80, 100, 120 μm/s), the wear rate of the seal fins is higher than that when there is only radial rub and the wear rate continuously increases with the axial incursion rate.
- When the radial incursion rate keeps constant, the axial rub will not change the wear mechanism. The delamination wear is dominated on the top surface of the seal fin, while the metal wear is dominated on the axial rub side of the seal fin.
- The tribo-layer on the top surface of the seal fin will thicken with the axial incursion rate. The thick tribo-layer can block the heat transfer to the substrate. However, the thick tribo-layer is more prone to crack under periodical thermomechanical stress and the cracks are wide and deep.
- When the axial incursion rate is low (60 μm/s), slight α phase globularization and dissolution of secondary α phase occur on the substrate microstructure. With the increasing axial incursion rate, the increasing rubbing temperature will induce the complete dissolution of secondary α phase and even the recrystallization of the α phase. The microstructural change of the seal fins will reduce the strength and the cracking resistance of the seal fins, which may lead to the rapid propagation of the cracks during the operation of the aero-engine.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Composition | Ti | Al | Cr | Zr | Mo | Sn |
---|---|---|---|---|---|---|
Content/% | balance | 5.03 | 3.88 | 1.99 | 4.02 | 2.07 |
Composition | Ni | Cr | Fe | Mo | Co | Al |
---|---|---|---|---|---|---|
Content/% | balance | 21.74 | 19.18 | 8.46 | 1.31 | 0.13 |
Composition | W | Si | C | P | Cu | - |
Content/% | 0.65 | 0.24 | 0.066 | 0.014 | 0.08 | - |
Test No. | Axial Incursion Rate (Vainc) (μm/s) | Axial Incursion Depth (Da) (μm) | Radial Incursion Rate (Vrinc) (μm/s) | Radial Incursion Depth (Dr) (μm) | Temperature (T) (°C) | Rubbing Speed (Vt) (m/s) |
---|---|---|---|---|---|---|
V-1 | 60 | 900 | 100 | 1500 | 350 | 380 |
V-2 | 80 | 1200 | ||||
V-3 | 100 | 1500 | ||||
V-4 | 120 | 1800 |
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Lu, B.; Xuan, H.; Ma, X.; Han, F.; Hong, W.; Zhi, S. The Influence of the Axial Rub Added in the Radial Rub on the Wear of the Seal Fins during the High Speed Rub of Labyrinth-Honeycomb Seal. Materials 2021, 14, 1997. https://doi.org/10.3390/ma14081997
Lu B, Xuan H, Ma X, Han F, Hong W, Zhi S. The Influence of the Axial Rub Added in the Radial Rub on the Wear of the Seal Fins during the High Speed Rub of Labyrinth-Honeycomb Seal. Materials. 2021; 14(8):1997. https://doi.org/10.3390/ma14081997
Chicago/Turabian StyleLu, Bin, Haijun Xuan, Xiaojian Ma, Fangjun Han, Weirong Hong, and Shaoqiang Zhi. 2021. "The Influence of the Axial Rub Added in the Radial Rub on the Wear of the Seal Fins during the High Speed Rub of Labyrinth-Honeycomb Seal" Materials 14, no. 8: 1997. https://doi.org/10.3390/ma14081997