Permeability Testing of Composite Material and Adhesive Bonds for the DC-XA Composite Feedline Program

NASA/TM-108483, Nettles, A.T., Permeability Testing of Composite Material and Adhesive Bonds for the DC-XA Composite Feedline Program, Materials and Processes Laboratory, Science and Engineering Directorate. NASA Marshall Space Flight, March 1995, pp. 12, Format(s): PDF 440k

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Hercules IM7/8552 carbon/epoxy and Hysol EA 9394 epoxy adhesive bonded between composite/titanium were tested for permeability after various numbers of thermal cycles between 100 C and liquid nitrogen (-196 C). The specimens were quenched from the 100 C temperature into liquid nitrogen to induce thermal shock into the material. Results showed that the carbon/epoxy system was practically impermeable even after 12 thermal cycles. The EA 9394 adhesive bondline was more permeable than the carbon/epoxy, but vacuum mixing minimized the permeability and kept it within allowable limits. Thermal cycling had little effect on the permeability values of the bondline specimens.

Keywords:	composite materials, permeability, adhesives
CASI Document ID Number:	95N23551
Subjects:	Chemistry and Materials: Composite Materials: Composite Materials
ID Code:	266
Deposited On:	26 June 2002