Development of a lightweight x-ray mirror using thin carbon-fiber-reinforced plastic (CFRP)

Awaki, Hisamitsu; Oue, Chisato; Iwakiri, Hayao; Omatsu, Maki; Yoshida, Tessei; Tsubasa, Yokota; Ishida, Naoki; Matsumoto, Hironori

doi:10.1117/12.2312037

Cited by 2 publications

(1 citation statement)

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“…For developing a lightweight, high-throughput telescope with subarc min angular resolution, we study thin carbon-fiberreinforced plastic (CFRP) mirror with the original monolithic Wolter-I geometry. [15][16][17] In our CFRP mirror, thin CFRP is used as the mirror substrate instead of the thin aluminum foil often used in the conventional lightweight telescopes such as ASCA XRT. A smooth surface on the CFRP substrate can be formed using a replication method.…”

Section: Introductionmentioning

confidence: 99%

Effect of barrier layer on moisture absorption of thin carbon-fiber-reinforced plastic mirror substrates

Awaki

Yoshida

Oue

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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Carbon-fiber-reinforced plastic (CFRP) has a higher strength-to-weight ratio and forming flexibility than metals, making it suitable for fabricating lightweight x-ray mirrors. However, CFRP has the disadvantages of print-through and deformation due to moisture absorption, which have prevented its use in optical mirrors. To expand the application of CFRP, we studied the formation of a moisture barrier layer on CFRP substrates. We formed a flattening layer a few micrometers thick on a CFRP substrate, following which we coated the substrate with SiO x as a moisture barrier. The effect of moisture absorption was then evaluated using accelerated aging tests. We found that the diffusivity of the CFRP substrate at 60°C and a relative humidity of 100% was ∼2 × 10 −6 mm 2 h −1 , which is 1/500th that of the barrier-less substrate. In the tests, the moisture absorption rate increased after ∼800 h. As we observed cracks on the flattening layer after 600 h, the rate increase could be associated with these cracks. Considering the damage to the barrier layer, we propose a modified model for the time profile, which is congruent with the observed time profile of the moisture content.

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Section: Introductionmentioning

confidence: 99%