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 4×10 -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°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
Scientific and Technological Research Council of Turkey
5th International Symposium on Nitrides -- 3 April 2006 through 5 April 2006 -- Eskisehir -- 71251
5th International Symposium on Nitrides -- 3 April 2006 through 5 April 2006 -- Eskisehir -- 71251
Anahtar Kelimeler
Glass removal, MgO, Silicon nitride ceramics, Sintering, Vacuum heat treatment
Kaynak
Materials Science Forum
WoS Q Değeri
Scopus Q Değeri
Q4
Cilt
554
