| 核电站O形橡胶密封圈的耐环境性能研究 |
| Research on Environmental Resistance of O-Ring Rubber Seals for Nuclear Power Plants |
| 投稿时间：2023-06-19 修订日期：2023-06-19 |
| DOI：10.12136/j.issn.1000-890X.2025.04.0284 |
| 中文关键词: 橡胶密封圈 热空气老化 湿热老化 臭氧老化 |
| 英文关键词: rubber seals heat-air aging damp-heat aging ozone aging |
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| 中文摘要: |
| 选取3种核电站常用O形橡胶密封圈[丁腈橡胶（NBR）、三元乙丙橡胶（EPDM）和氟橡胶（FKM）密封圈]进行热空气老化、湿热老化、臭氧老化试验。结果表明：在热空气老化条件下，NBR密封圈的硬度增大，拉断伸长率减幅最大，氧化诱导时间缩短最明显，耐热空气老化性能最差；在湿热老化条件下，3种橡胶密封圈的性能均未发生大幅度下降，其中NBR密封圈的硬度增大，NBR和FKM密封圈的拉断伸长率在短时间内（老化168 h）增大，在较长时间（老化672 h）后减小；在臭氧老化条件下，FKM密封圈的硬度不变，拉断伸长率增大，耐臭氧性能最好。在3种橡胶密封圈的热性能中，氧化诱导时间变化较热重分析组分变化更为敏感，且氧化诱导时间的数据单一，其可以更加方便地判断橡胶密封圈的老化状态。 |
| 英文摘要: |
| Three commonly used types of O-ring rubber seals for nuclear power plants[nitrile rubber（NBR），ethylene-propylene-diene rubber（EPDM） and fluororubber（FKM） seals] were selected for heat-air aging，damp-heat aging and ozone aging tests.The results showed that，under heat-air aging conditions，the hardness of NBR sealing ring increased，the elongation at break decreased the most，the oxidation induction time was shortened the most significantly，and the heat-air aging resistance was the worst.Under damp-heat aging conditions，the performance of the three types of rubber seals did not significantly decrease.Among them，the hardness of NBR sealing ring increased，and the elongation at break of NBR and FKM sealing rings increased in a short period of time（aging 168 h） and decreased after a longer period of time（aging 672 h）.Under ozone aging conditions，the hardness of FKM sealing ring remained unchanged，the elongation at break increased，and the ozone resistance was the best.Among the thermal properties of the three types of rubber seals，changes in the oxidation inducation time were more sensitive than changes in thermal gravimetric analysis components，and the data for the oxidation inducation time was single，making it easier to determine the aging status of the rubber seals. |
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