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Mechanical properties of SiC ceramics sintered with RE2O3 (RE: Sc, Lu, Y) and AlN additives

Authors
Kumar, B. V. Manoj; Roh, Myong-Hoon; Kim, Young-Wook; Kim, Wonjoong; Park, Sang-Whan
Issue Date
2010-04
Publisher
KOREAN INST METALS MATERIALS
Citation
METALS AND MATERIALS INTERNATIONAL, v.16, no.2, pp.229 - 233
Abstract
Highly densified Silicon Carbide (SiC) ceramics with 10 vol.% sintering additives, RE2O3 (RE: Sc, Lu, Y) and AlN, were prepared via hot pressing in N-2 atmosphere. The influence of sintering additive composition on the mechanical properties of the sintered specimens is discussed. The Sc2O3-AlN system consisted of equi-axed grain structure, while the Lu2O3-AlN and Y2O3-AlN systems rendered largely grown platelet grains. While fracture toughness was enhanced with regards to the contribution of crack deflection and crack bridging mechanisms for intergranular fracture, strength remained almost the same for all specimens.
Keywords
SILICON-CARBIDE CERAMICS; HIGH-TEMPERATURE STRENGTH; ALUMINUM NITRIDE; INTERGRANULAR PHASE; OXYNITRIDE ADDITIVES; SCANDIUM OXIDE; MICROSTRUCTURE; BEHAVIOR; TOUGHNESS; SILICON-CARBIDE CERAMICS; HIGH-TEMPERATURE STRENGTH; ALUMINUM NITRIDE; INTERGRANULAR PHASE; OXYNITRIDE ADDITIVES; SCANDIUM OXIDE; MICROSTRUCTURE; BEHAVIOR; TOUGHNESS; ceramics; sintering; mechanical properties; scanning electron microscopy (SEM); silicon carbide
ISSN
1598-9623
URI
https://pubs.kist.re.kr/handle/201004/131606
DOI
10.1007/s12540-010-0411-2
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KIST Article > 2010
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