Paper Title:
Influence of Additive Type on Densification and Phase Transformation of Seeded Si3N4
  Abstract

This paper deals with densification and a®b phase transformation of Si3N4, with a constant b-Si3N4 seeds concentration regarding sintering temperature and different additive types. The seeds of b-Si3N4 were obtained by sintering of silicon nitride in a-form and additive mixture consisting of Y2O3 and SiO2. Two different Si3N4/additive mixtures (Y2O3 + Al2O3 and CeO2) containing constant amount of seeds were prepared and tested. Characterization of sintered samples involved phase analysis by X−ray diffraction and density measurements. The results indicated that in the presence of yttria-alumina mixture both the phase transformation and the densification were enhanced as compared to samples containing only CeO2 as a sintering additive. The reasons for observed behavior are discussed in detail.

  Info
Periodical
Edited by
Dragan P. Uskokovic, Slobodan K. Milonjic, Djan I. Rakovic
Pages
429-434
DOI
10.4028/www.scientific.net/MSF.494.429
Citation
A. Vučković, B. Matović, S. Bošković, "Influence of Additive Type on Densification and Phase Transformation of Seeded Si3N4", Materials Science Forum, Vol. 494, pp. 429-434, 2005
Online since
September 2005
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: D. Bučevac
Abstract:The effect of seeding on the microstructure and mechanical properties of hot-pressed silicon nitride was investigated by introducing large,...
423
Authors: Ling Bai, Chang Chun Ge, Wei Ping Shen, Ke Zhang, X.D. Mao
Abstract:The densification and phase transformation of high α-phase silicon nitride powder synthesized by SHS with a combination of Y2O3 and Al2O3...
577
Authors: Ahmet Atasoy, Ahmet Ersoy
Abstract:In this study, two different starting compositions were prepared according to two cation values, and then the mixture was compacted...
902
Authors: Yong Feng Li, Ping Liu, Guan Jun Qiao, Jian Feng Yang, Hai Yun Jin, Xiang Dong Wang
Abstract:With commercial α-Si3N4 and h-BN powders as starting materials, La2O3, Al2O3, Y2O3 as sintering additives, Si3N4/BN composite ceramics with...
761
Authors: Mariah Oliveira Juliani, Carolyne Davi Oliveria, Rosa Maria Rocha
Chapter 5: Structural Ceramics
Abstract:Zirconium diboride (ZrB2) is a covalent compound that leads the category of ultra high temperature ceramics materials owing to its...
250