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Influence of Different BN Grades on Sintering Behaviour, Microstructure and Properties of Machinable Si 3 N 4 ‐MoSi 2 ‐BN Composites
Author(s) -
Medri V.,
Dalle Fabbriche D.,
Melandri C.,
Guicciardi S.,
Bellosi A.
Publication year - 2006
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.200500228
Subject(s) - materials science , machinability , microstructure , composite material , ceramic , diamond , sintering , hot pressing , machining , carbide , pressing , anisotropy , metallurgy , physics , quantum mechanics
The machinability of ceramic materials can be improved by the addition of hexagonal‐BN: the expensive diamond‐based tools could be replaced by cemented carbides tools lowering the machining costs. Anisotropic materials are obtained by hot pressing due to h‐BN plate‐like structure. Si 3 N 4 ‐BN composites are suitable as rotor seals for gas turbine engines in the ranges 1000°C–1300°C. Oxidation resistance can be improved up to 1500°C by the addition of MoSi 2 .