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Texture, microstructures, and mechanical properties of AlN‐based ceramics with Si 3 N 4 –Y 2 O 3 additives
Author(s) -
Liu Cong,
Guo WeiMing,
Sun ShiKuan,
Zou Ji,
Wu ShangHua,
Lin HuaTay
Publication year - 2017
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.15029
Subject(s) - materials science , flexural strength , texture (cosmology) , fracture toughness , microstructure , ceramic , transgranular fracture , vickers hardness test , hot pressing , composite material , intergranular fracture , ceramic matrix composite , mineralogy , intergranular corrosion , analytical chemistry (journal) , crystallography , chemistry , image (mathematics) , artificial intelligence , computer science , chromatography
Textured AlN‐based ceramics with improved mechanical properties were prepared by hot pressing using Si 3 N 4 and Y 2 O 3 as additives. The introduction of Si 3 N 4 –Y 2 O 3 into AlN matrix led to the formation of secondary Y 3 AlSi 2 O 7 N 2 and fiber‐like 2H δ AlN‐polytypoid phases, the partial texture of all crystalline phases, and the fracture mode change from intergranular to transgranular. Consequently, Vickers hardness, fracture toughness and flexural strength of AlN‐based ceramics by the replacement of Y 2 O 3 by Si 3 N 4 –Y 2 O 3 increased significantly from 10.4±0.3 GP a, 2.4±0.3 MP a m ½ and 333.3±10.3 MP a to 14.2±0.4 GP a, 3.4±0.1 MP a m ½ and 389.5±45.5 MP a, respectively.