Densification of silicon carbide using oxy-nitride additives for space-based telescope mirror applications

作者：Kumar R Suresh^*; Shukla Anoop K; Babu Sankaranarayanan; Sivakumar Dhenuvakonda; Gandhi Ashutosh S

来源：Optical Engineering, 2011, 50(7): 070504.

DOI：10.1117/1.3610987

• silicon carbide
• hot pressing
• densification
• thermal conductivity
• mirror

Densification behavior of alpha silicon carbide (SiC) during vacuum hot pressing was studied up to 1900 degrees C with sintering additives based on AIN and Y(2)O(3) in different proportions. Near theoretical density was obtained with a total sintering additive content of < 4 vol.%. The microstructure of SiC sintered with AIN + Y(2)O(3) revealed fine equiaxed grains against the additional elongated grains exhibited by SiC sintered with AIN 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.

• 出版日期2011-7