Title of article :
SiCf/O′-SiAlON composite: properties and oxidation retained properties
Author/Authors :
Huang، نويسنده , , Chao M. and Zhu، نويسنده , , Dong and Yuren، نويسنده , , Xu and Kriven، نويسنده , , Waltraud M. and Yuh، نويسنده , , Chao Y. and Zhang، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1996
Pages :
9
From page :
176
To page :
184
Abstract :
A composite of O′SiAlON (Si2-xAlxN2-xO1+x, with x ∼ 0.14) reinforced with 20 vol.% SiC monofilaments was fabricated by hot-pressing, at 1600°C, for 2 h under 34 MPa pressure. The mechanical and interfacial properties of the composites, as-fabricated as well as post-oxidized, were, investigated. The composite exhibited a significant improvement in ultimate flexure strength (640 MPa) and work of fracture (42 kJ m−2) compared with that (350 MPa and 1.8 kJ m−2, respectively) of the monolithic material. These mechanical properties were slightly increased after the composite was heat treated for 24 h in air at 1200 and 1300°C. However, the composite exhibited a significant degradation in ultimate strength, while the work of fracture (WOF) remained unchanged after exposure in air at temperatures beyond 1400°C. The as-fabricated composite revealed a low interfacial shear strength (6.2 MPa) and a frictional sliding stress (3.2 MPa). After the composite was oxidized at elevated temperatures, the interfacial bonding and sliding stresses were reduced to noticeable extents, resulting from the degradation of the carbon coating layer of the SiC monofilaments.
Keywords :
Strength , Interface , SiC fiber reinforcement , O?SiAlON , Toughness , Work of fracture , Oxidation
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Serial Year :
1996
Journal title :
MATERIALS SCIENCE & ENGINEERING: A
Record number :
2134347
Link To Document :
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