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Preferred Orientation of Porous Si 3 N 4 Ceramics by Gel‐Casting in a Longitudinal Rotating Magnetic Field
Author(s) -
Yang Zhigang,
Yu Jianbo,
Deng Kang,
Zhong Yunbo,
Ren Zhongming,
Fu Hua,
Wu Hongya,
Yu Gang
Publication year - 2018
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201700147
Subject(s) - materials science , porosity , ceramic , orientation (vector space) , composite material , casting , sintering , rotational speed , magnetic field , rotation (mathematics) , rotating magnetic field , mineralogy , geometry , chemistry , mathematics , physics , quantum mechanics
Preferred orientation of porous Si 3 N 4 ceramics with β‐Si 3 N 4 powders as raw material is obtained by gel‐casting in a longitudinal rotating magnetic field and subsequent pressureless sintering. The effects of rotational speed on crystal orientation and properties of porous Si 3 N 4 ceramics are analyzed. The results show that the c‐axis of β‐Si 3 N 4 grains tended to align along the direction of the rotation axis. The degree of orientation in the samples increases with the increasing rotational speed. The textured porous samples show higher bending strength than that of untextured porous samples owing to the integrative effect of the grain orientation and pores.