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Optical Engineering • Open Access

Densification of silicon carbide using oxy-nitride additives for space-based telescope mirror applications
Author(s): R. Suresh Kumar; Anoop K. Shukla; Sankaranarayanan Babu; Dhenuvakonda Sivakumar; Ashutosh S. Gandhi

Paper Abstract

Densification behavior of alpha silicon carbide (SiC) during vacuum hot pressing was studied up to 1900ºC with sintering additives based on AlN and Y2O3 in different proportions. Near theoretical density was obtained with a total sintering additive content of < 4 vol.%. The microstructure of SiC sintered with AlN+Y2O3 revealed fine equiaxed grains against the additional elongated grains exhibited by SiC sintered with AlN alone. The SiC having high density exhibited very good strength, elastic modulus, high thermal conductivity, low coefficient of thermal expansion and excellent polishability for telescope mirror applications.

Paper Details

Date Published: 1 July 2011
PDF: 4 pages
Opt. Eng. 50(7) 070504 doi: 10.1117/1.3610987
Published in: Optical Engineering Volume 50, Issue 7
Show Author Affiliations
R. Suresh Kumar, Vikram Sarabhai Space Ctr. (India)
Anoop K. Shukla, Vikram Sarabhai Space Ctr. (India)
Sankaranarayanan Babu, Vikram Sarabhai Space Ctr. (India)
Dhenuvakonda Sivakumar, Vikram Sarabhai Space Ctr. (India)
Ashutosh S. Gandhi, Indian Institute of Technology Madras (India)

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