Moisture Expansion Of Carbon/Carbon Composite Materials
Beata Macherzyńska, Jan Piekarczyk, Stanisław Błażewicz Akademia Górniczo-Hutnicza, Wydział Inżynierii Materiałowej i Ceramiki, ul. Mickiewicza 30, 30-059 Kraków
Annals 1 No. 2, 2001 pages 144-146
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abstract The results of humidity effect of 1D and 2D C/C composite materials are presented in this paper. These materials were made of ultra-high modulus graphite fibres (K-1100) and phenol-formaldehyde as a carbon matrix precursor. 1D C/C composite materials measured according to the direction arrangement of fibres, had the moisture expansion coefficient, αw of about −2 ⋅ 10−6 [1⁄%] (Tab. 1). Similar results of αw were obtained for 2D carbon composite materials measured in two directions. The positive and one order of magnitude higher coefficient αw ≅ 7.5 ⋅ 10−5 [%⁄mm] was observed for 1D carbon composite measured perpendicularly to the fibres direction. Neutron irradiation effect on moisture expansion of C/C composite at a fluence dose of 7.3 ⋅ 1012 n/cm2 was examined. The measurements revealed no significant change on αw value. Additionally, the influence of neutron irradiation on water absorption and humidity of the samples was determined (Tab. 2).