Densification of silicon carbide using oxy-nitride additives for space-based telescope mirror applications
| Autor: | Dhenuvakonda Sivakumar, A.K. Shukla, Ashutosh S. Gandhi, Sankaranarayanan Babu, R. Suresh Kumar |
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| Rok vydání: | 2011 |
| Předmět: |
Equiaxed crystals
Materials science General Engineering Wide-bandgap semiconductor Sintering Nitride Microstructure Hot pressing Atomic and Molecular Physics and Optics Thermal expansion chemistry.chemical_compound chemistry Silicon carbide Composite material AlN Alpha silicon carbide Densification behavior Elongated grains Fine equiaxed grains High density High thermal conductivity Low coefficient of thermal expansions Polishability Sintering additives Space-based telescopes Telescope mirrors Theoretical density Vacuum hot pressing Additives Carbon fiber reinforced plastics Densification Mirrors Nitrides Optical telescopes Telescopes Thermal conductivity Vacuum applications |
| Zdroj: | Optical Engineering. 50:070504 |
| ISSN: | 0091-3286 |
| DOI: | 10.1117/1.3610987 |
| Popis: | Densification behavior of alpha silicon carbide (SiC) during vacuum hot pressing was studied up to 1900C 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 AlNY2O3 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. � 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). |
| Databáze: | OpenAIRE |
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