Pressure Sintering of Si3N4 System for Near-Net Shape Forming

[+] Author and Article Information
Shyam K. Samanta

Materials Engineering and Processing Program, National Science Foundation, Washington, D.C. 20550, and Department of Mechanical Engineering and Applied Mechanics, The University of Michigan, Ann Arbor, Michigan 48109-2125

Harue Wada, Liya Wang

Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109-2125

J. Eng. Mater. Technol 111(2), 176-182 (Apr 01, 1989) (7 pages) doi:10.1115/1.3226451 History: Received May 24, 1988; Online September 15, 2009


Yttria and alumina have been used with particular success, either singly or in combination, as densification aids for hot pressing and sintering of silicon nitride. To obtain desirable mechanical, physical, and chemical properties, it is necessary to minimize the addition of alumina as a densifying agent, however, very low amount of alumina additive reduces the possibility of sintering silicon nitride to high theoretical density. In this paper the authors have elucidated a sintering process which densifies silicon nitride to near theoretical density even with low amount of alumina doping.

Copyright © 1989 by ASME
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