Table of Contents
Textures and Microstructures
Volume 24 (1995), Issue 1-3, Pages 75-91
http://dx.doi.org/10.1155/TSM.24.75

Texture and Microstructure in Hot-Pressed Si3N4

1lnstitut für Festkörper- und Werkstofforschung Dresden e.V., Germany
2Fraunhofer Institut für Keramische Technologien und Sinterwerkstoffe, Dresden, Germany

Received 10 September 1994; Accepted 7 November 1994

Copyright © 1995 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The texture formation in hot-pressed Si3N4-ceramics was investigated by means of X-ray diffraction. A ring-fibre texture is observed with the basal plane (002) perpendicular to the hot-pressing axis. The texture index of hot-pressed Si3N4 depends on the starting powder mixture and process parameters. The αβ phase transfomation and the growth of β-Si3N4 needlelike grains are correlated with the texture. Measurements of fracture toughness and aspect ratio confirm the correlation with microstructure. The structure is the result of crystal growth and flow process during hot-pressing.