Vacuum heat treatment of MgO-densified pressureless sintered silicon nitride ceramics

Küçük Resim Yok

Tarih

2007

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

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

Sayı

Künye