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Reactive Hot‐Pressed Alumina–Boron Nitride Composites with Y 2 O 3 Sintering Additive
Author(s) -
Zhang GuoJun,
Kita Hideki,
Kondo Naoki,
Ohji Tatsuki
Publication year - 2005
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/j.1551-2916.2005.00437.x
Subject(s) - materials science , sintering , relative density , nitride , boron nitride , aluminium , boron , flexural strength , microstructure , phase (matter) , composite material , hot pressing , particle size , grain size , chemical engineering , chemistry , organic chemistry , layer (electronics) , engineering
The effect of Y 2 O 3 addition (0–5 wt%) on the densification and properties of reactive hot‐pressed alumina (Al 2 O 3 )–boron nitride composites based on the reaction between aluminum borate (2Al 2 O 3 ·B 2 O 3 ) and aluminum nitride (AlN) was investigated. The densification process was very sensitive to the amount of Y 2 O 3 . Compared with a low relative density of 79.3 theoretical density (TD)% for material with no Y 2 O 3 addition, the material density reached 98.6 TD% with 0.25% Y 2 O 3 addition. High Y 2 O 3 additions resulted in the formation of a new phase Al 5 Y 3 O 12 . The grain growth of the Al 2 O 3 matrix was promoted by the Y 2 O 3 addition. Owing to the high density and the small Al 2 O 3 particle size the sample with 0.25% Y 2 O 3 addition demonstrated the highest bending strength of 540 MPa.