Vacuum heat treatment of MgO-densified pressureless sintered silicon nitride ceramics
Küçük Resim Yok
Tarih
2007
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
Trans Tech Publications Ltd
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
Silicon nitride samples were pressureless sintered with up to 5 w/o MgO to give densities in the range 98-99% of theoretical. After pressureless sintering, selected samples were placed in a vacuum heat treatment furnace surrounded by a carbon bed in a carbon crucible at a pressure of less than 4x10(-4) mbar, and vacuum heat treated at different temperatures and times to remove grain-boundary glass. The results showed that this was substantially achieved at 1575 degrees C for 3h and that increasing the time to 5 hours gave still further improvement. SEM images, EDX analysis and oxidation tests provided additional evidence for the removal of Mg from the samples.
Açıklama
5th International Symposium on Nitrides -- APR 03-05, 2006 -- Anadolu Univ, Eskisehir, TURKEY
Anahtar Kelimeler
silicon nitride ceramics, sintering, MgO, vacuum heat treatment, glass removal
Kaynak
Nitrides and Oxynitrides Iii
WoS Q Değeri
N/A
Scopus Q Değeri
Cilt
554
