LIFETIME EXTRAPOLATION OF PMR-15 AND LARC(TM)-160 GRAPHITE COMPOSITES

被引：0
|
作者：
HINKLEY, JA
NELSON, JB
机构：
[1] NASA, Hampton, United States
来源：
JOURNAL OF ADVANCED MATERIALS | 1994年 / 25卷 / 03期
关键词：
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Small unidirectional composite specimens of two nadimide-terminated thermosetting polyimide resins were aged in circulating air ovens at various temperatures for up to 25,000 hours. Criteria for weight loss and loss in short-beam shear strength were used to define useful lifetimes as a function of temperature. An Arrhenius relationship could be used to extrapolate the data to lower temperatures and longer times. Both LaRC(TM)-160/Celion 6000 and PMR-15/Celion 6000 graphite composites gave extrapolated use temperatures of 160-180-degrees-C for a 60,000-hour life. Apparent activation energies were 12-20 kcal/mol.
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页码：45 / 48
页数：4
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