Sintering of High-Performance Silicon Nitride Ceramics Under Vibratory Pressure

    Authors

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

    Comments

    Authors: contact us about adding a copy of your work at STARS@ucf.edu

    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

    Share

    COinS