Effects of Al, B and C additives on microstructure and mechanical properties of spark-plasma-sintered SiC ceramics
- Authors
- Cho, KS; Lee, KS
- Issue Date
- 2005
- Publisher
- TRANS TECH PUBLICATIONS LTD
- Keywords
- spark plasma sintering; silicon carbide; densification; strength
- Citation
- ADVANCED SI-BASED CERAMICS AND COMPOSITES, v.287, pp.329 - 334
- Journal Title
- ADVANCED SI-BASED CERAMICS AND COMPOSITES
- Volume
- 287
- Start Page
- 329
- End Page
- 334
- URI
- https://scholarworks.bwise.kr/kumoh/handle/2020.sw.kumoh/3403
- DOI
- 10.4028/www.scientific.net/KEM.287.329
- ISSN
- 1013-9826
- Abstract
- Densification of the SiC powder without and with additives B+C or Al+B+C was carried out by spark plasma sintering (SPS). The unique features of the process are the possibilities of using a very fast heating rate and a short holding time to obtain fully dense materials. The heating rate and applied pressure were kept at 100° C/min and 40 MPa, while the sintering temperature and soaking time varied from 1650-1850° C for 10-40 min, respectively. The SPS-sintered specimens with the addition of B+C or Al+B+C at 1850° C reached near-theoretical density. The 3C major crystalline phase of SiC was transformed to 6H at 1800° C and translated to 4H during prolonged annealing at 1850° C. The strength of 531.0 MPa and the fracture toughness of 3.9 MPa• m(1/2) were obtained by the addition of Al+B+C to SiC prepared at 1850° C for 10 min.
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