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| Thermal Aging Behavior and Mechanism of Fluoroether Rubber under Different Media |
| Received:October 31, 2023 Revised:December 11, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.12.009 |
| KeyWord:fluoroether rubber FM-2D thermal aging mechanical properties X-ray photoelectron spectroscopy |
| Author | Institution |
| LIU Jun-bang |
Electronic Fifth Institute of the Ministry of Industry and Information Technology, Guangzhou , China |
| ZHANG Shao-feng |
Electronic Fifth Institute of the Ministry of Industry and Information Technology, Guangzhou , China |
| LI Pu |
China Aerospace Hunan Power Machinery Research Institute, Hunan Zhuzhou , China |
| ZHANG Hong-bin |
Electronic Fifth Institute of the Ministry of Industry and Information Technology, Guangzhou , China |
| CHEN Di-yun |
Electronic Fifth Institute of the Ministry of Industry and Information Technology, Guangzhou , China |
| TANG Qing-yun |
Electronic Fifth Institute of the Ministry of Industry and Information Technology, Guangzhou , China |
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| Abstract: |
| The work aims to study the thermal aging behavior and mechanism of fluoroether rubber FM-2D in air and Pegasus II lubricating oil. The storage test of fluoroether rubber at high temperature was carried out, and the degradation law of mechanical properties of fluoroether rubber was investigated in air and oil. The tensile properties, compressive properties and hardness of the samples were tested after the aging test. A Fourier infrared spectrometer, a scanning electron microscope and an X-ray electron spectroscopy were used to detect and analyze the samples after the test to explore the aging mechanism. The result showed that fluoroether rubber could maintain good mechanical properties for a long time at 200 ℃. While when the temperature was above 200 ℃, the mechanical properties of fluoroether rubber degraded obviously. After 31 days of aging in hot air at 220 ℃, the tensile strength of fluoroether rubber decreased by 27.0%, the elongation at break increased by 89.8%, the relaxation rate of compressive stress was 34.6%, and the hardness decreased by 8.7%. After 31 days of hot oil aging at 220 ℃, the tensile strength of fluoroether rubber decreased by 85.9%, the elongation at break decreased by 83.9%, the relaxation rate of compressive stress was ‒17.5%, and the hardness increased by 4.2%. Through analysis and characterization, it is founded that the molecular chain of rubber is broken under the influence of hot oxygen during the aging process of hot air, and the strength of rubber decreases. In hot oil aging, the coupling effect of oil medium and high temperature makes the crosslinking network of rubber fail, and the rubber becomes hard and brittle. |
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