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Influence of Yttria–Alumina Content on Sintering Behavior and Microstructure of Silicon Nitride Ceramics
Author(s) -
Yang JianFeng,
Ohji Tatsuki,
Niihara Koichi
Publication year - 2000
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.1151-2916.2000.tb01520.x
Subject(s) - sintering , microstructure , materials science , silicon nitride , grain growth , ceramic , phase (matter) , yttria stabilized zirconia , chemical engineering , grain size , silicon , metallurgy , chemistry , cubic zirconia , organic chemistry , engineering
The present study investigates the influence of the content of Y 2 O 3 –Al 2 O 3 sintering additive on the sintering behavior and microstructure of Si 3 N 4 ceramics. The Y 2 O 3 :Al 2 O 3 ratio was fixed at 5:2, and sintering was conducted at temperatures of 1300°–1900°C. Increased sintering‐additive content enhanced densification via particle rearrangement; however, phase transformation and grain growth were unaffected by additive content. After phase transformation was almost complete, a substantial decrease in density was identified, which resulted from the impingement of rodlike β‐Si 3 N 4 grain growth. Phase transformation and grain growth were concluded to occur through a solution–reprecipitation mechanism that was controlled by the interfacial reaction.