Title

Sintering of High-Performance Silicon Nitride Ceramics Under Vibratory Pressure

Authors

Authors

S. Li; Z. P. Xie; W. J. Xue; X. D. Luo;L. A. An

Comments

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Abbreviated Journal Title

J. Am. Ceram. Soc.

Keywords

FRACTURE-TOUGHNESS; SI3N4 CERAMICS; GRAIN-GROWTH; ASPECT-RATIO; MICROSTRUCTURE; DENSIFICATION; BEHAVIOR; PHASE; Materials Science, Ceramics

Abstract

To improve mechanical behaviors of silicon nitride ceramics, here we introduced a novel external fieldvibratory pressure into the sintering of Si3N4 ceramics with advantages of higher density, more uniform distribution of interfacial phase, higher sintering motivation in the width direction, and therefore more favorable mechanical properties than traditional sintering methods. Grain size and aspect ratio of the two ceramics were investigated with linear intercept method. Flexural strength of the vibratory-assisted hot-pressing (VAHP) specimen increased from 936 +/- 27.2MPa to 1247 +/- 28.9MPa, and an increase of 10% was achieved in fracture toughness. It is believed that such VAHP method can provide a universal approach and new opportunities for the fabrication of covalent-bonded ceramics or composites with enhanced performances.

Journal Title

Journal of the American Ceramic Society

Volume

98

Issue/Number

3

Publication Date

1-1-2015

Document Type

Article

Language

English

First Page

698

Last Page

701

WOS Identifier

WOS:000351050300005

ISSN

0002-7820

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