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Glass coating on SiCp/Al composite mirror for ultra-smooth surface

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Abstract

In this paper, we reported a novel space mirror which was prepared by machining SiCp/Al composite mirror blank. To improve optical property, SiCp/Al composite with SiC content more than 60 % was bonded with the bismuthate glass. The novel mirror blank was machined by the designed abrasive processes. The experimental results showed that the grain size played an important role in the material removal mechanism of the blank. The blank was machined in the brittle mode at the grain size larger than or equal to 10 μm, while the curled glass chips occurred at the grain size smaller than or equal to 5 μm. With the increase of the polishing time, surface roughness gradually tended to a constant value. When the mirror blank and the polishing pad rotated in the same direction with the equal rotational speed, the uniform material removal rate could be realized. Therefore, an ultra-smooth plane surface of 0.96 nm Ra, 0.052 λ (λ = 632.8 nm) PV, and 0.009 λ RMS was achieved after 360 min ultra-precision grinding. The Ag film was deposited on the mirror by magnetron sputtering method, and the reflectance in the 400–780 nm wavelength range for the mirror was measured. The measurement indicated that the average reflectance of the mirror could reach 96 %.

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Authors and Affiliations

  1. School of Mechanical and Automotive Engineering, South China University of Technology, Guangzhou, 510640, China

    H. S. Lou, S. G. Qu, X. Q. Li, B. Wang & T. R. Kuang

Authors
  1. H. S. Lou
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  2. S. G. Qu
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  3. X. Q. Li
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  4. B. Wang
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  5. T. R. Kuang
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Correspondence to H. S. Lou or S. G. Qu.

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Lou, H.S., Qu, S.G., Li, X.Q. et al. Glass coating on SiCp/Al composite mirror for ultra-smooth surface. Int J Adv Manuf Technol 88, 1745–1753 (2017). https://doi.org/10.1007/s00170-016-8920-x

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  • DOI: https://doi.org/10.1007/s00170-016-8920-x

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