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A Novel Hot Pressing Flowing Sintering for Preparation of Texturing Ceramics
Author(s) -
Jiang QiangGuo,
Liu Jian,
Guo WeiMing,
Liu Wei,
Cheng LiXia,
Gong ManFeng,
Wu ShangHua
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13715
Subject(s) - sintering , materials science , ceramic , texture (cosmology) , hot pressing , pressing , forging , porosity , composite material , graphite , perpendicular , metallurgy , geometry , image (mathematics) , mathematics , artificial intelligence , computer science
In this paper, we proposed a novel hot‐pressing flowing sintering (HPFS) for texturing ceramics. The perfectly two‐dimensional textured Si 3 N 4 ceramics were fabricated by HPFS. The Lotgering orientation factor f L for Si 3 N 4 texture was 0.9975. During earlier sintering stage, the specimen flowed along the plane which perpendicular to the hot‐pressing direction under pressure, through the controlling of the graphite die movement. The rod‐like β‐Si 3 N 4 nuclei was easily to texture during the flowing process, due to the small size of the β‐Si 3 N 4 nuclei and the high porosity of the flowing specimen. As a result, the perfectly two‐dimensional textured Si 3 N 4 was obtained. After aligned, the β‐Si 3 N 4 grains grew along the materials flowing direction with little constraint, which accelerated the growth of the grains extensively. So, in addition to texture, the Si 3 N 4 ceramics by HPFS also showed high aspect ratio. The present study indicated that the HPFS would be more simple and low‐cost method for texture of Si 3 N 4 , compared with conventional hot‐forging which contained the sintering and forging.