Application of hot-pressed silicon carbide to large high-precision optical structures

C. James Shih; Andris Ezis

doi:10.1117/12.225300

23 October 1995 Application of hot-pressed silicon carbide to large high-precision optical structures

C. James Shih, Andris Ezis

Proceedings Volume 2543, Silicon Carbide Materials for Optics and Precision Structures; (1995) https://doi.org/10.1117/12.225300
Event: SPIE's 1995 International Symposium on Optical Science, Engineering, and Instrumentation, 1995, San Diego, CA, United States

Abstract

A new grade of silicon carbide has been developed with properties that make it very attractive for a variety of applications in precision optical structures. Its microstructural homogeneity makes it capable of accepting an optical finish with subnanometer surface roughness. Its strength and fracture toughness, on a bulk scale, exceed all previous silicon carbide materials. This hot-pressed silicon carbide can be produced in single blocks up to 50 cm square and up to 20 cm thick. Two bonding techniques have been developed for fusing large segments of hot pressed silicon carbide together into a large monolith for constructing large optical structures without using a metallic braze. Bonding structure and bonding strength are discussed.

Citation Download Citation

C. James Shih and Andris Ezis "Application of hot-pressed silicon carbide to large high-precision optical structures", Proc. SPIE 2543, Silicon Carbide Materials for Optics and Precision Structures, (23 October 1995); https://doi.org/10.1117/12.225300

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