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Thermal Aging of Graphite/Polyimide Composites

Thermal Aging of Graphite/Polyimide Composites PDF Author: JB. Nelson
Publisher:
ISBN:
Category : Composite materials
Languages : en
Pages : 16

Book Description
Celion® 6000/PMR-15, Celion 6000/LARC-160, and Celion 6000/RK-99 graphite/polyimides were aged in circulating air ovens at temperatures of 202, 232, 260, and 288°C for various times up to 15 000 h. Three unidirectional specimens were studied: short-beam-shear (SBS), flexure, and 153-mm square panels. The interior region of the square panels exhibited little or no property degradation. Based on the individually aged SBS specimen results, the relative thermal-oxidative stability from highest to lowest is as follows: PMR-15, LARC-160, RK-99. Celion 6000/PMR-15 and Celion 6000/LARC-160 laminates retained at least 80% of their initial flexural strengths for the duration of aging at each temperature. Celion 6000/RK-99 laminates exhibited a 20 to 50% loss of flexural strength at all aging temperatures. All three graphite/polyimide (Gr/PI) laminate materials degraded preferentially at the specimen edge perpendicular to the fibers.
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