The effect of heat-treatment on the performance of sub-micron SiCp-reinforced alpha-beta sialon composites .2. Heat-treatment studies

Liu, Q; Gao, L; Yan, DS; Mandal, H; Thompson, DP

doi:10.1016/s0955-2219(96)00101-x

The effect of heat-treatment on the performance of sub-micron SiCp-reinforced alpha-beta sialon composites .2. Heat-treatment studies

Atıf İçin Kopyala

Liu Q., Gao L., Yan D., Mandal H., Thompson D.

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, cilt.17, sa.4, ss.587-592, 1997 (SCI-Expanded)

Yayın Türü: Makale / Tam Makale
Cilt numarası: 17 Sayı: 4
Basım Tarihi: 1997
Doi Numarası: 10.1016/s0955-2219(96)00101-x
Dergi Adı: JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
Sayfa Sayıları: ss.587-592
Anadolu Üniversitesi Adresli: Hayır

Özet

The effects of heat-treatment on alpha --> beta sialon transformation in dense, agglomerate-free Ln-sialon/SiCp(Ln=Nd,Yb) composites are reported. The stability of the alpha-sialon phase is not only dependent on the temperature and time of heat-treatment, but also on the kind of additive and the amount of SiC particles. In Nd-densified Samples, the alpha-sialon phase is very unstable at 1450 degrees C and transforms, almost totally to the beta phase with the Nd-M (melilite) phase and NdAlO3 as grain-boundary crystalline phases. In contrast, Yb3+-densified samples show good stability for the alpha-sialon phase at 1450 degrees C, with only a small amount of beta-sialon produced. The crystalline grain-boundary phases produced in this case are Yb-garnet, and Yb-J-phase. (C) 1997 Elsevier Science Limited. All rights reserved.