Liquid phase sintering of SiC with AIN and rare-earth oxide additives

M. Balog, P. Šajgalík, Z. Lenčéš, J. Kečkéš, Jow-Lay Huang

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Abstract

Liquid phase sintering of SiC was performed using rare-earth oxide R 2O3 (R = Y, Yb, and Sm) and AlN sintering additives. The addition of 2 vol% β-SiC seeds or α-SiC platelets resulted in bimodal microstructure after annealing for 10 hours at 1850°C in mixed N 2 + Ar atmosphere. Samples had a negligible weight loss after hot pressing. The bimodal microstructure contributed to the improvement of fracture toughness. Seeding by α-SiC seeds stimulated the β → α-SiC phase transformation and increased the hardness. Samples with α-SiC seeds and complex Yb2O3 + Sm2O3 + AlN additives had a Vickers hardness of 27.5 GPa. Seeding by β-SiC whiskers hindered the β → α-SiC phase transformation and increased the fracture toughness up to 6.5 MPa.m1/2.

Original languageEnglish
Pages (from-to)191-202
Number of pages12
JournalCeramic Transactions
Volume142
Publication statusPublished - 2003 Jan 1
EventSilicon-Based Structural Ceramics for the New Millenium Symposium, Proceedings - St. Louis, MO, United States
Duration: 2002 Apr 282002 May 1

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Balog, M., Šajgalík, P., Lenčéš, Z., Kečkéš, J., & Huang, J-L. (2003). Liquid phase sintering of SiC with AIN and rare-earth oxide additives. Ceramic Transactions, 142, 191-202.