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Journal of Astronomical Telescopes, Instruments, and Systems • Open Access

Studies of the moisture absorption of thin carbon fiber reinforced plastic substrates for x-ray mirrors
Author(s): Tomoki Mita; Satoshi Sugita; Hisamitsu Awaki; Daichi Kurihara; Kenya Yoshioka; Hideyo Kunieda; Hironori Matsumoto; Mizuki Nomura; Takuya Miyazawa; Ikuyuki Mitsuishi; Keiji Ogi; Toshihiro Iwase; Masato Maejima; Yuuki Tomita; Naoki Shima; Takashi Ishikawa; Takayoshi Hamada; Naoki Ishida; Shin Utsunomiya; Tomohiro Kamiya; Hiromichi Akiyama; Kazuaki Kishimoto

Paper Abstract

We study a lightweight x-ray mirror with a carbon fiber reinforced plastic (CFRP) substrate for next-generation x-ray satellites. For tightly nested x-ray mirrors, such as those on the Suzaku and ASTRO-H telescopes, CFRP is the suitable substrate material because it has a higher strength-to-weight ratio and forming flexibility than those of metals. In flat CFRP substrate fabrication, the surface waviness has a root mean square (RMS) of ∼1  μm in the best products. The RMS approximately reaches a value consistent with the RMS of the mold used for the forming. We study the effect of moisture absorption using accelerated aging tests in three environments. The diffusivity of the CFRP substrate at 60°C and at relative humidity of 100% is ∼9.7×10−4  mm2·h−1, and the acceleration rate to the laboratory environment was 180 times higher. We also develop co-curing functional sheets with low water-vapor transmissivity on the CFRP substrate. Co-curing the sheets successfully reduced the moisture absorption rate by 440 times compared to the un-co-cured substrate. Details of the CFRP substrate fabrication and moisture absorption tests are also reported.

Paper Details

Date Published: 15 July 2015
PDF: 7 pages
J. Astron. Telesc. Instrum. Syst. 1(3) 034003 doi: 10.1117/1.JATIS.1.3.034003
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 1, Issue 3
Show Author Affiliations
Tomoki Mita, Ehime Univ. (Japan)
Satoshi Sugita, Ehime Univ. (Japan)
Hisamitsu Awaki, Ehime Univ. (Japan)
Daichi Kurihara, Ehime Univ. (Japan)
Kenya Yoshioka, Ehime Univ. (Japan)
Hideyo Kunieda, Nagoya Univ. (Japan)
Hironori Matsumoto, Nagoya Univ. (Japan)
Mizuki Nomura, Ehime Univ. (Japan)
Takuya Miyazawa, Nagoya Univ. (Japan)
Ikuyuki Mitsuishi, Nagoya Univ. (Japan)
Keiji Ogi, Ehime Univ. (Japan)
Toshihiro Iwase, Nagoya Univ. (Japan)
Masato Maejima, Nagoya Univ. (Japan)
Yuuki Tomita, Ehime Univ. (Japan)
Naoki Shima, Nagoya Univ. (Japan)
Takashi Ishikawa, Nagoya Univ. (Japan)
Takayoshi Hamada, Tamagawa Engineering Co., Ltd. (Japan)
Naoki Ishida, Tamagawa Engineering Co., Ltd. (Japan)
Shin Utsunomiya, Japan Aerospace Exploration Agency (Japan)
Tomohiro Kamiya, Japan Aerospace Exploration Agency (Japan)
Hiromichi Akiyama, Mitsubishi Heavy Industries Ltd. (Japan)
Kazuaki Kishimoto, Mitsubishi Heavy Industries, Ltd. (Japan)

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