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High‐Temperature Strength of Liquid‐Phase‐Sintered SiC with AlN and Re 2 O 3 (RE = Y, Yb)
Author(s) -
Kim YoungWook,
Mitomo Mamoru,
Nishimura Toshiyuki
Publication year - 2002
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2002.tb00211.x
Subject(s) - materials science , ceramic , sintering , microstructure , annealing (glass) , flexural strength , composite material , grain boundary , hot pressing , phase (matter) , liquid phase , grain growth , silicon carbide , physics , organic chemistry , thermodynamics , chemistry
Using AlN and RE 2 O 3 (RE = Y, Yb) as sintering additives, two different SiC ceramics with high strength at 1500°C were fabricated by hot‐pressing and subsequent annealing under pressure. The ceramics had a self‐reinforced microstructure consisting of elongated α‐SiC grains and a grain‐boundary glassy phase. High‐temperature strength up to 1600°C was measured and compared with that of the SiC ceramics fabricated with AlN and Er 2 O 3 . SiC ceramics with AlN and Y 2 O 3 showed the best strength (∼630 MPa) at 1500°C, while SiC ceramics with AlN and Er 2 O 3 the best strength (∼550 MPa) at 1600°C.