Thermal stability of CVD-SiC lightweight optics

Details Thermal stability of CVD-SiC lightweight optics Thermal stability of CVD-SiC lightweight optics

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2543...38g&link_type=abstract

Proc. SPIE Vol. 2543, p. 38-48, Silicon Carbide Materials for Optics and Precision Structures, Mark A. Ealey; Ed.

Physics

Optics

1

Scientific paper

The lightweight SiC mirrors that are fabricated by the CVD process at Morton Advanced Materials contain graphite core enclosed in the SiC backstructure. A finite element analysis of a lightweight SiC model mirror was performed to assess the effect of the graphite core on the thermal stability of the SiC mirror in the temperature range of 77 - 1623 K. The results indicate that for both no-slip (SiC deposit adhered to graphite core) and slip cases, the maximum stresses in the SiC mirror structure are significantly less than the flexural strength of SiC. Further, the maximum stress in graphite core is close to the tensile strength of graphite indicating that graphite core will probably fracture. Finally, the SiC faceplate figure distortion due to the presence of the graphite core is quite small, on the order of a few tens of nanometers.

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