SYMPOSIA PAPER Published: 01 January 1990
STP26494S

Low Scatter Surfaces on Silicon Carbide

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Reaction bonded silicon carbide (RB SiC) can be readily fabricated to near net shape and mirror blanks produced by this method can potentially be less costly than those fabricated by chemical vapor deposition (CVD). However, RB SiC is two phase, SiC and up to 30% silicon (Si), and can not normally be directly polished to low scatter and roughness levels due to the difference in hardness of the two phases. We have investigated the polishability of RB SiC as a function of Si content and microstructure. Our results show that with a favorable microstructure, RB SiC can be polished to less than 10Å rms. For reduced roughness and lower scatter surfaces, we have developed low temperature deposition techniques to apply polishable, single phase coatings to the figured two phase surfaces. Scatter and roughness measurements show levels are comparable to CVD SiC.

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Developed by Committee: E13
Pages: 256–262
DOI: 10.1520/STP26494S
ISBN-EB: 978-0-8031-5157-4
ISBN-13: 978-0-8031-4478-1