You are not logged in Total: 7journals, 20,687articles Online
AccountAccount
Login / Register
Forgot Login?
 
Main menuMain menu
What's new
Journal list
Visiting ranking
Phrase ranking
Polls
About us
 
SearchSearch
 
Journal Site
Advanced Search
 

Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.121  No.1414 (June) (2013)  >  pp.520-523

Journal of the Ceramic Society of Japan
<<Previous article Vol.121  No.1414 (June) (2013)   pp.520 - 523 Next article>>

Structure and oxidation behavior of high temperature ZrB2–SiBCN ceramics with polyborosilazane as a sintering additive

Yajing LI1), Yue ZHANG1), Yushu WANG2)
1) Key Laboratory of Aerospace Materials and Performance (Ministry of Education), School of Materials Science and Engineering, Beihang University 2) School of Materials Science and Engineering, Georgia Institute of Technology Atlanta

The polyborosilazane (PBSZ) was employed as the sintering additive and the dense ZrB2 ultra-high temperature ceramic samples were fabricated by hot pressing at 1900°C. The relative density of sintered ceramics is 96.4%. The PBSZ was converted to amorphous SiBCN ceramics after sintering. Mass transfer process was significantly improved in the amorphous region among the ZrB2 grains. Densification temperature was reduced. The mechanical properties and high temperature oxidation resistance were also enhanced. The bending strength and fracture toughness of the ZrB2 ceramics were 241 ± 10 MPa and 4.47 ± 0.5 MPa m1/2, respectively. The crack was deflected along the grain boundaries. During high-temperature oxidation process, the grain boundary at SiBCN ceramic was oxidized into borosilicate glass and the low viscous glass was extruded out and spread over the surface quickly. The continuous oxide coating formed on the ZrB2 ceramics surface prevented further oxidation.


Keyword:
Polyborosilazane, ZrB2, Sintering, High-temperature oxidation

Received: March 03, 2013
Accepted: April 20, 2013 , Published online: June 01, 2013
Copyright © 2013 The Ceramic Society of Japan

PDFPDF file (J-STAGE)J-STAGEJ-STAGE


SPARC Japan

Terms of Use | Privacy Policy