| Title | Long term oxidation behaviour of liquid phase pressureless sintered SiC-AlN ceramics obtained without powder bed |
|---|---|
| Publication Type | Articolo su Rivista peer-reviewed |
| Year of Publication | 2006 |
| Authors | Magnani, G., and Beaulardi L. |
| Journal | Journal of the European Ceramic Society |
| Volume | 26 |
| Pagination | 3407-3413 |
| ISSN | 09552219 |
| Keywords | Aluminum nitride, Ceramic materials, Grain boundaries, Oxidation resistance, Porosity, Powder bed, Pressureless sintering, Silicon carbide, Sintering, Solid solutions |
| Abstract | This paper describes the results of the investigation of the oxidation behaviour of 50 wt.% SiC-50 wt.%AlN composites obtained by means of pressureless sintering with Y2O3 as sintering-aid and without using a powder bed to limit the weight loss. Sintered bodies show high density (>98%T.D.) and the microstructure reveals a matrix composed by SiC-AlN solid solution with Y10Al2Si3O18N4 as grain boundary phase. This material exhibits a parabolic oxidation kinetic in the temperature range 1200-1500 °C. Long term oxidation (200 h) induces the formation of a protective oxide scale, composed by mullite, cristobalite and yttrium disilicide, up to 1400 °C. At higher temperature (1500 °C), SiC oxidation behaviour changes from "passive" to "active" and the oxide layer consequently shows porosity due to the formation of gaseous species like SiO and CO. © 2005 Elsevier Ltd. All rights reserved. |
| Notes | cited By 15 |
| URL | https://www.scopus.com/inward/record.uri?eid=2-s2.0-33747047004&doi=10.1016%2fj.jeurceramsoc.2005.10.005&partnerID=40&md5=e533a6d3ea31b526ed31c36df0772dc9 |
| DOI | 10.1016/j.jeurceramsoc.2005.10.005 |
| Citation Key | Magnani20063407 |
