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| Assessment on Performance Decay Induced by Hot Air Aging for Typical Fluoroelastomer Sealing Materials |
LIU Ming( ), ZHANG Liandong, SUN Zhihua, GAO Meng, YAN Wei, ZHAO Mingliang |
| Aviation Key Laboratory of Science and Technology on Advanced Corrosion and Protection for Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China |
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Cite this article:
LIU Ming, ZHANG Liandong, SUN Zhihua, GAO Meng, YAN Wei, ZHAO Mingliang. Assessment on Performance Decay Induced by Hot Air Aging for Typical Fluoroelastomer Sealing Materials. Journal of Chinese Society for Corrosion and protection, 2025, 45(1): 137-147.
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Abstract The performance variation of a typical fluoroelastomer FX-17 due to hot air aging at 160, 180, 200, 220 and 240 oC, respectively was assessed, in terms of its hardness, compressive permanent deformation rate, tensile strength, elongation at break and other parameters. The corresponding change of its molecular structure were characterized by means of Fourier infrared spectroscopy and other methods. Based on Arrhenius empirical formula, the model of performance decay and life degradation of fluoroelastomer FX-17 was also established. The results show that after being hot air aged, the maximum change range of Shore hardness increased from the initial value of 79 HA to 92 HA, the maximum change range of compressive permanent deformation rate increased to 116% of the initial value, and the maximum change range of tensile strength decreased from the initial value of 15 MPa to 8 MPa. The maximum change range of elongation at break decreased from the initial value of 199% to 125%. In the process of aging in hot air, the dehydrofluorination of large molecules of FX-17 mainly occurs, which leads to a chain reaction of free radical aging. When the compression permanent deformation rate is used as the evaluation index of the sealing failure of typical fluoroelastomer FX-17, its service life can reach more than 2700 h at 200 oC.
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Received: 12 September 2024
32134.14.1005.4537.2024.297
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Corresponding Authors:
LIU Ming, E-mail: luminousa@126.com
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