Reaction bonded silicon carbide (RBSiC) offers very stiff and lightweight opportunities for aerospace mirror designs. However, the optical figuring of the front surface to general aspheric shape presents problems to conventional superabrasive grinding and single point diamond turning. This difficulty arises largely due to the hard, brittle nature of this ceramic and is complicated by it's multi-phase composition (SiC in a matrix of silicon). Vapor-deposited silicon or SiC claddings are often applied to provide a more machinable, reflective surface; but ideally the uncoated substrate would be finishable to polish quality. Previous work on optimized grinding of silicon-infiltrated SiC has addressed conditions of production surface grinding for high removal rate and improved strength. This paper describes a cooperative effort with United Technologies Optical Systems to utilize ductile regime grinding to generate a 200mm by 72mm rectangular off-axis mirror manufactured from bare RBSiC.
Evaluation and application of precision contour grinding for a RBSiC off-axis spherical mirror
Bewertung und Anwendung von Feinprofilschleifen für einen außeraxialen, sphärischen Spiegel aus reaktionsgebundenem Siliziumcarbid
1994
4 Seiten, 3 Bilder, 3 Tabellen, 4 Quellen
Aufsatz (Konferenz)
Englisch
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