CHINESE JOURNAL OF ENERGETIC MATERIALS
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10-2 s-1压缩应变率下Al-Teflon的反应现象
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(解放军理工大学野战工程学院, 江苏 南京 210007)

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冯彬(1988-),男,博士研究生,从事爆炸力学、反应材料研究。e-mail: fengbin.plaust@foxmail.com

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Reaction of Al-Teflon under 10-2 s-1 Compression Strain Rate
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(College of Field Engineering, PLA University of Science and Technology, Nanjing 210007, China)

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    摘要:

    采用不同的热处理工艺, 得到了A类(烧结温度380 ℃, 降温速率50 ℃·h-1)、B类(烧结温度350 ℃, 降温速率70 ℃·h-1)两类Al-Teflon反应材料。通过准静态压缩实验对两类试件反应现象进行了测试。得到了应力应变曲线。进行了试件密度测量, SEM微观形貌分析及高速摄影观察。结果表明, B类试件发生剧烈放热反应, A类试件没有反应发生。B类试件的应变硬化模量是A类试件的5.3倍, 其在应力应变平面的反应区间为:真实应变1.2~2.2, 真实应力60~80 MPa。A、B两类试件结晶度分别为63%和43%。在A类试件中发现大量纳米级聚四氟乙烯纤丝, 可能对材料裂纹拓展起阻碍作用。B类试件的反应现象与试件的强剪切作用及脆性开裂现象密切相关。

    Abstract:

    Two types of Al-Teflon specimens were obtained by different heat treatment processes(type A: sintering temperature 380 ℃, cooling rate 50 ℃·h-1; type B: sintering temperature 350 ℃, cooling rate 70 ℃·h-1). The reaction phenomenon of two kinds of specimens was tested via quasi-static compression test. The stress-strain curves were obtained. The measurement of density, micro morphology analysis of SEM and observations of high speed photography of the specimens were performed. Results show that a violent exothermic reaction is occurred for type B specimen, while no reaction is occurred for type A specimen. The strain hardening modulus of type B specimen is 5.3 times higher than that of type A specimen. The reaction zone of type B specimen in the stress and strain plane is between true strain of 1.2 and 2.2 and true stress of 60 MPa and 80 MPa. The crystallinity of two types of specimens is 63% for type A and 43% for type B. The crystallinity of two types of Al-Teflon materials is different. A great deal of nanometer Teflon fibrils is found in type A specimen, which may hinder the crack propagation of materials. The reaction phenomenon of type B specimen is closely related to phenomenon of strong shear stress and brittle fractures of the specimen.

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引用本文

冯彬,方向,李裕春,等.10-2 s-1压缩应变率下Al-Teflon的反应现象[J].含能材料, 2016, 24(6):599-603. DOI:10.11943/j. issn.1006-9941.2016.06.015.
FENG Bin, FANG Xiang, LI Yu-chun, et al. Reaction of Al-Teflon under 10-2 s-1 Compression Strain Rate[J]. Chinese Journal of Energetic Materials, 2016, 24(6):599-603. DOI:10.11943/j. issn.1006-9941.2016.06.015.

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历史
  • 收稿日期: 2015-09-15
  • 最后修改日期: 2015-10-28
  • 录用日期: 2015-11-17
  • 在线发布日期: 2016-05-20
  • 出版日期: 2016-06-03