聚四氟乙烯压缩蠕变行为测试与表征  

Testing and Characterization of Compressive Creep Behavior in Polytetrafluoroethylene

作　　者：雷淼 周健 李孟茹 晁敏[1] 颜录科[1] Lei Miao;Zhou Jian;Li Mengru;Chao Min;Yan Luke(School of Materials Science&Engineering,Chang’an University,Xi'an 710064,China)

机构地区：[1]长安大学材料科学与工程学院,西安710064

出　　处：《工程塑料应用》2021年第6期118-124,136,共8页Engineering Plastics Application

基　　金：陕西省科技计划项目重点产业创新链(群)-工业领域项目(2020ZDLGY13-08);西安市科技创新人才服务企业项目(2020KJRC0127);大学生创新创业训练计划项目(S202010710175X,S202010710144,S202010710202,S202010710239);中央高校基本科研业务费专项资金项目(300102318403,300102310104,300102319306);长安大学基础研究支持计划专项基金项目。

摘　　要：为研究聚四氟乙烯(PTFE)压缩蠕变行为,自行设计制造压缩蠕变试验装置,分别对其常温与高温压缩蠕变性能进行测试,建立PTFE压缩蠕变模型和蠕变方程,对所得压缩蠕变性能数据进行非线性拟合分析。结果表明,自制高温压缩蠕变测试仪实现了由室温到250℃范围内、不同载荷作用下材料长期压缩蠕变性能测试的自动化操作;PTFE在压缩蠕变过程中并不表现出黏性流动形变,但当其表现出与一般材料相同的典型蠕变行为时,推迟时间要比其它条件下大许多,当发生蠕变断裂时推迟时间将提高近一个数量级。所建立的七元件蠕变模型能全面地反映PTFE的压缩蠕变行为,可预测PTFE的长时力学行为、使用寿命以及疲劳与失效等。蠕变拟合曲线与测试数据吻合良好,拟合精度高。In order to study the compression creep behavior of polytetrafluoroethylene(PTFE),the compression creep test device was designed and manufactured by ourselves,the normal temperature and high temperature compression creep properties of PTFE were tested,and the PTFE compression creep model and creep equation were established,and then nonlinear fitting analysis was performed on the obtained compression creep performance data.The results show that the self-made high-temperature compression creep tester realizes the automatic operation of the long-term compression creep performance test of materials under different loads from room temperature to 250℃.PTFE does not exhibit viscous flow deformation during compression and creep,but when it exhibits the same typical creep behavior as general materials,the delay time is much longer than under other conditions,and when creep rupture occurs,the delay time increases by nearly one order of magnitude.The established seven-element creep model can fully reflect the compression creep behavior of PTFE,and can predict the long-term mechanical behavior,service life,fatigue,and failure of PTFE.The creep fitting curve is in good agreement with the test data,and the fitting accuracy is high.

关 键 词：聚四氟乙烯 复合材料 压缩蠕变 测试 表征 

分 类 号：TQ327.3[化学工程—合成树脂塑料工业]