中国塑料 ›› 2022, Vol. 36 ›› Issue (10): 98-103.DOI: 10.19491/j.issn.1001-9278.2022.10.015

• 加工与应用 • 上一篇    下一篇

核电用聚四氟乙烯密封件老化状态研究及使用寿命预测

吴昆1(), 樊亚勤1, 沈倩1, 苗壮1, 周城2   

  1. 1.中广核高新核材科技(苏州)有限公司,江苏 太仓 215400
    2.中广核三角洲(太仓)检测技术有限公司,江苏 太仓 215400
  • 收稿日期:2022-07-05 出版日期:2022-10-26 发布日期:2022-10-27
  • 作者简介:吴昆(1993-)男,工程师,从事高分子材料老化状态与寿命评估研究,2441825591@qq.com

Study on aging state and life prediction of PTFE seals for nuclear power stations

WU Kun1(), FAN Yaqin1, SHEN Qian1, MIAO Zhuang1, ZHOU Cheng2   

  1. 1.CGN Advanced Materials Technology (Suzhou)Co,Ltd,Taicang 215400,China
    2.CGN?DELTA(Taicang) Testing Technology Co,Ltd,Taicang 215400,China
  • Received:2022-07-05 Online:2022-10-26 Published:2022-10-27

摘要:

选用核电用聚四氟乙烯(PTFE)材料,在不同温度下(315、300、285 ℃)进行高温加速老化试验。通过傅里叶变换红外光谱仪(FTIR)、扫描电子显微镜(SEM)、热失重分析仪(TG)对材料的微观结构、热性能进行了表征分析,然后采用热老化和热失重法建立了2种老化寿命预测模型。结果表明,随着老化时间的延长,PTFE的FTIR谱图出现了明显的红移,表面出现了明显的孔洞,材料的热稳定性和力学性能变差;寿命预测模型显示热失重法与热老化法推算出的寿命预测结果基本一致,并且随着使用温度的增加,误差进一步缩小,这表明热失重法对PTFE材料使用寿命的推算是可靠的,这种简单易行的方法非常适用于PTFE材料。

关键词: 聚四氟乙烯, 热老化性能, 寿命预测

Abstract:

In this study, a high⁃temperature accelerated aging test was conducted for the polytetrafluoroethylene (PTFE) material used in nuclear power station at temperatures of 315, 300, and 285 ºC. The microstructure and thermal properties of the PTFE material were characterized using Fourier⁃transform infrared spectroscopy, SEM, and thermogravimetric (TG) analyzer. Two aging life prediction models were established through thermal aging using a TG method. The results indicated that PTFE exhibited an evident red shift in its infrared frequency together with some obvious hole marks appearing on its surface, suggesting a deterioration in thermal stability and mechanical property with the aging time. The life prediction model demonstrated that the life prediction results obtained from the TG method thermal aging method were consistent, and the error decreased with an increased in service temperature. This indicated that the TG method was reliable to calculate the service life of the PTFE material and very suitable for the evaluation of the PTFE material as a simple and convenient life prediction method.

Key words: polytetrafluoroethylene, thermal aging, life prediction

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