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Effects of rare-earth oxide and alumina additives on thermal conductivity of liquid-phase-sintered silicon carbide
Ist Teil von
Journal of materials research, 2003-08, Vol.18 (8), p.1854-1862
Ort / Verlag
New York, USA: Cambridge University Press
Erscheinungsjahr
2003
Quelle
Springer Journals
Beschreibungen/Notizen
SiC ceramics were prepared from a β–SiC powder doped with two different sintering additives—a mixture of La2O3 and Y2O3 and a mixture of Al2O3 and Y2O3—by hot pressing and annealing. Their microstructures, phase compositions, lattice oxygen contents, and thermal conductivities were evaluated. The SiC doped with rare-earth oxides attained thermal conductivities in excess of 200 W/(m K); however, the SiC doped with additives containing alumina had thermal conductivities lower than 71 W/(m K). The high thermal conductivity of the rare-earth-oxide-doped SiC was attributed to the low oxygen content in SiC lattice, high SiC–SiC contiguity, and lack of β– to α–SiC polytypic transformation. The low thermal conductivity of the alumina-doped SiC was attributed to the point defects resulting from the dissolution of Al2O3 into SiC lattice and the occurrence of polytypic transformation.
Sprache
Englisch
Identifikatoren
ISSN: 0884-2914
eISSN: 2044-5326
DOI: 10.1557/JMR.2003.0259
Titel-ID: cdi_proquest_miscellaneous_27876309
Format
–
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