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Sintering and Properties of β′‐Sialon with a Nitrogen‐Rich Y 2 O 3 Sintering Aid
Author(s) -
Bandyopadhyay Siddhartha,
Mukerji Joydeb,
Roychoudhury Kalpana
Publication year - 1989
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.1151-2916.1989.tb06272.x
Subject(s) - sintering , sialon , materials science , fracture toughness , toughness , liquid phase , nitrogen , phase (matter) , composite material , mineralogy , metallurgy , chemistry , physics , organic chemistry , thermodynamics
The synthesis of dense sintered sialon with external additives selected from the system Y 2 O 3 –AIN–SiO 2 is reported. The highest density (3.21 g/cm 3 ) was achieved at 1750°C at 90 min of sintering with 5 wt% additive. The degree of sialon substitution increased with the amount of liquid; the YSiO 2 N crystalline phase formed concurrently. Strength degradation occurred above 1000°C. The fracture toughness of the material sintered with a lower amount of sintering aid remained relatively unchanged to 1200°C. The material with more additive exhibited decreased toughness above 1000°C.