Fabrication of Hard and Strong α/β-Si3N4 Composites With MgSiN2 as Addivitives

α/β‐Si3N4 composites with various α/β phase ratios were prepared by hot pressing at 1600°–1650°C with MgSiN2 as sintering additives. An excellent combination of mechanical properties (Vickers indentation hardness of 23.1 GPa, fracture strength of about 1000MPa, and toughness of 6.3 MPa·m1/2) could b...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Ceramic Society 2006-12, Vol.89 (12), p.3824-3826
Main Authors: Peng, Gui-hua, Jiang, Guo-jian, Li, Wen-lan, Zhang, Bao-lin, Chen, Li-dong
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Structural ceramics
Technical ceramics
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:α/β‐Si3N4 composites with various α/β phase ratios were prepared by hot pressing at 1600°–1650°C with MgSiN2 as sintering additives. An excellent combination of mechanical properties (Vickers indentation hardness of 23.1 GPa, fracture strength of about 1000MPa, and toughness of 6.3 MPa·m1/2) could be obtained. Compared with conventional Si3N4‐based ceramics, this new material has obvious advantages. It is as hard as typical in‐situ‐reinforced α‐Sialon, but much stronger than the latter (700 MPa). It has comparable fracture strength and toughness, but is much harder than β‐Si3N4 ceramics (16 GPa). The microstructures and mechanical properties can be tailored by choosing the additive and controlling the heating schedule.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1551-2916.2006.00958.x