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| Aging Behavior of FX-4 Fluororubber |
| Received:March 09, 2023 Revised:April 27, 2023 |
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| DOI：10.7643/issn.1672-9242.2023.08.001 |
| KeyWord:FX-4 fluororubber seal temperature medium strain aging |
| Author | Institution |
| SHANG Xu-jing |
AECC Shenyang Engine Design Institute, Shenyang , China |
| DANG Heng-yao |
Luoyang Ship Material Research Institute, Henan Luoyang , China |
| XUE Zhi-bo |
AECC Shenyang Engine Design Institute, Shenyang , China |
| YOU Bao-cai |
AECC Shenyang Engine Design Institute, Shenyang , China |
| XING Pi-chen |
AECC Shenyang Engine Design Institute, Shenyang , China |
| WANG Yu |
AECC Shenyang Engine Design Institute, Shenyang , China |
| ZHA Xiao-qin |
Luoyang Ship Material Research Institute, Henan Luoyang , China |
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| Abstract: |
| The work aims to study the aging behavior of FX-4 fluororubber under different working conditions to provide a scientific basis for assessing life of equipment in engineering practice. Based on the requirements of a certain equipment for the use of FX-4 fluororubber material, five aging tests were designed to simulate the working conditions. The aging behavior of FX-4 fluororubber under different temperature, media and strain was studied by observing the changes of appearance, mechanical properties, chemical structure, sealability, etc. After 9 000 hours of aging test, the compression set of FX-4 fluororubber showed an obvious increase trend, and the growth rate first increased, then slowed down and finally increased again. The decomposition temperature increased from 508 ℃ to about 520 ℃. The surface crystallinity and internal crystallinity decreased from 61.7% to about 37% and 48% respectively, indicating that the aging damage gradually extended from the surface to the interior of the sample. The molecular structure did not change fundamentally, and the sealability was not damaged. After 9 000 hours of aging test, FX-4 fluororubber has different degrees of aging, but still has good sealability and can be used normally. |
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