Studies of the moisture absorption of thin carbon fiber reinforced plastic substrates for x-ray mirrors

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

doi:10.1117/1.JATIS.1.3.034003

15 July 2015 Studies of the moisture absorption of thin carbon fiber reinforced plastic substrates for x-ray mirrors

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

Author Affiliations +

Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 1, Issue 3, 034003 (July 2015). https://doi.org/10.1117/1.JATIS.1.3.034003

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.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

Citation Download Citation

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, and Kazuaki Kishimoto "Studies of the moisture absorption of thin carbon fiber reinforced plastic substrates for x-ray mirrors," Journal of Astronomical Telescopes, Instruments, and Systems 1(3), 034003 (15 July 2015). https://doi.org/10.1117/1.JATIS.1.3.034003

Published: 15 July 2015

ACCESS THE FULL ARTICLE

JOURNAL ARTICLE
7 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY