| GUO Hui-ming,YANG Li-qi,ZHANG Hang,WANG En-qing,LIU Yan-fei,TIAN Wei,ZHONG Yan,XUE Wei-hai.Wear Behavior of Brush Seal Ring Coating and Bristles Friction Pair under High Speed and High Temperature[J],52(3):207-216 |
| Wear Behavior of Brush Seal Ring Coating and Bristles Friction Pair under High Speed and High Temperature |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.03.018 |
| KeyWord:seal coating bristles brush seal high speed rubbing wear mechanism |
| Author | Institution |
| GUO Hui-ming |
AECC Sichuan Gas Turbine Establishment, Chengdu , China |
| YANG Li-qi |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Shenyang , China |
| ZHANG Hang |
AECC Sichuan Gas Turbine Establishment, Chengdu , China |
| WANG En-qing |
AECC Sichuan Gas Turbine Establishment, Chengdu , China |
| LIU Yan-fei |
AECC Sichuan Gas Turbine Establishment, Chengdu , China |
| TIAN Wei |
AECC Sichuan Gas Turbine Establishment, Chengdu , China |
| ZHONG Yan |
AECC Sichuan Gas Turbine Establishment, Chengdu , China |
| XUE Wei-hai |
Institute of Metal Research, Chinese Academy of Sciences, Shenyang , China;School of Materials Science and Engineering, University of Science and Technology of China, Shenyang , China |
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| Abstract: |
| Aiming at the wear problem of brush seal ring coating and bristles in aeroengine during service, the tribological behaviors of seal friction pairs composed of commonly used NiCr-Cr2C3 seal coatings and SG37A bristles were studied under high-speed rubbing condition. The high speed and high temperature rubbing test of seal ring coating and bristles friction pair was carried out under different feed rates and interference conditions by using a self-developed high-speed rubbing tester. SG37A bristles with a diameter of 0.08 mm was used for brush seal. 2 hundred bristles was placed in a 1.2 mm×1.2 mm groove, with an angle of 45° with the horizontal, and the exposed height of bristles was 2 mm. The base material of the brush seal ring simulating samples is GH4169 alloy, and the sealing coating on the surface is a double-layer structure. The bottom layer is made of CoNiCrAlY, with a thickness of 0.1 mm, which is prepared by explosive spraying; the surface layer is NiCr-Cr2C3 containing BaF2 and CaF2, with a thickness of 0.25 mm, which is prepared by plasma spraying. The tests were conducted on the self-developed high-speed friction and wear tester. The bristles and coating samples were respectively installed on the high-speed rotary table and the fixture of the feeding system. The feed speed (the radial feed rate of the coating moving to brisltles) was set to be 0.01 mm/s, 0.05 mm/s, and 0.1 mm/s, the interference is 0.3 mm, 0.5 mm and 1.0 mm. The linear speed of the bristles tip is 220 m/s, and the test heating temperature is 600 ℃.The depth of abrasion marks on the surface coating of brush seal ring was measured by contour measuring instrument. The original morphology and wear morphology of the coating and bristles friction pair were observed by Ultra depth of field optical microscope (OM) and scanning electron microscope (SEM), and the element composition on the wear surface was analyzed by EDS spectrometer, and the wear mechanism during the friction process was also analyzed. The results showed that abrasive wear, adhesive wear and transfer of bristles material to the seal coatings occur during high-speed and high-temperature rubbing between the NiCr-Cr2C3 coating and SG37A bristles. The bristles not only rub with the coating, but also have friction deformation and wear between the bristles. This is mainly due to the high-temperature deformation and extrusion of bristles during the wear process. Due to the existence of "tailing" phenomenon, the deformation and extrusion of bristle tips is more obvious. The increase of metal fluidity at high temperature further promotes the formation of diamond. By analyzing the influence of different interference amount and feed rate on the wear mark depth, it is found that both of them have an influence on the wear mark depth. With the increase of interference amount and feed rate, the coating wear mark depth increases. Under the severe working condition of high speed and high temperature, the bristles have significant deformation in the process of wear, and the interference amount has a greater influence on the wear of the seal ring coating and bristles sample. |
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