TY - GEN
T1 - Silicon nitride grain boundary glasses
T2 - Chemistry, structure and properties
AU - Hampshire, Stuart
AU - Pomeroy, Michael J.
PY - 2011
Y1 - 2011
N2 - Silicon nitride is recognised as a high performance material for both wear resistant and high temperature structural applications. Oxide sintering additives such as yttrium oxide and alumina are used to provide conditions for liquid phase sintering, during which the additives react with surface silica present on the Si3N4 particles and some of the nitride to form an oxynitride liquid which allows densification and transformation of α- to β-Si3N4 and on cooling remains as an intergranular oxynitride glass. This paper provides an overview of liquid phase sintering of silicon nitride ceramics, grain boundary oxynitride glasses and the effects of chemistry and structure on properties. As nitrogen substitutes for oxygen in oxynitride glasses, increases are observed in glass transition and softening temperatures, viscosities, elastic moduli and microhardness. These property changes are compared with known effects of grain boundary glass chemistry in silicon nitride ceramics.
AB - Silicon nitride is recognised as a high performance material for both wear resistant and high temperature structural applications. Oxide sintering additives such as yttrium oxide and alumina are used to provide conditions for liquid phase sintering, during which the additives react with surface silica present on the Si3N4 particles and some of the nitride to form an oxynitride liquid which allows densification and transformation of α- to β-Si3N4 and on cooling remains as an intergranular oxynitride glass. This paper provides an overview of liquid phase sintering of silicon nitride ceramics, grain boundary oxynitride glasses and the effects of chemistry and structure on properties. As nitrogen substitutes for oxygen in oxynitride glasses, increases are observed in glass transition and softening temperatures, viscosities, elastic moduli and microhardness. These property changes are compared with known effects of grain boundary glass chemistry in silicon nitride ceramics.
KW - Chemistry-microstructure-property relationships
KW - Intergranular glass
KW - Liquid phase sintering
KW - Microstructural engineering
KW - Oxynitride glass
KW - Silicon nitride
UR - http://www.scopus.com/inward/record.url?scp=79960696504&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/KEM.484.46
DO - 10.4028/www.scientific.net/KEM.484.46
M3 - Conference contribution
AN - SCOPUS:79960696504
SN - 9783037851814
T3 - Key Engineering Materials
SP - 46
EP - 51
BT - Advanced Engineering Ceramics and Composites
PB - Trans Tech Publications Ltd
ER -