[ATM] Glass and Ceramics heating at high temperature

[avinash balakrishnan <the_krecian@yahoo.com>]

Hi everyone,
 
 
I trying to penetrate soda lime glass CTE (8.36 X 10 -6 C) on ZTA  (Zirconia toughened alumina) ceramics CTE (8.0 X 10 -6 C) (3mm X 4mm) surface at temperatures more than 1300 C
 
To my surprise the ceramics showed bending when cooled to room temperature (Cooled in furnace). I calculated the deflection and calculated stress to be less that 150 MPA near the surface (very less to cause such a bend, while inner stress was less than 100 Mpa). Can anyone suggest what could be reason for such a bend in these samples. Even though thermal mismatch is hardly there.
 
oh ya! i heated the ZTA ceramics as such as in same conditions but no bending was seen. So question of zirconia and alumina mismatch doesn't come in picture, hopefully.
 
soda lime glass showed excellent wetting on ceramic
 
adios
 
Avinash


__________________________________________________
Do You Yahoo!?
Tired of spam?  Yahoo! Mail has the best spam protection around 
http://mail.yahoo.com 
_______________________________________________
ATM mailing list http://www.atmlist.net/