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The Effect of Powder Mixing Procedures on α‐SiAlON
Author(s) -
Shuba Roman,
Chen IWei
Publication year - 2006
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.1551-2916.2005.00816.x
Subject(s) - sialon , materials science , mixing (physics) , ceramic , hot pressing , sonication , ball mill , isopropyl alcohol , pressing , metallurgy , composite material , chemical engineering , mineralogy , chemistry , physics , quantum mechanics , engineering
Various procedures of mixing starting powders for hot‐pressing α‐SiAlON ceramics were studied. They included different milling methods (attrition milling, ball milling, and sonication), liquid medium (water, isopropyl alcohol, and pyridine), and atmospheres (ambient air and nitrogen). These mixing procedures resulted in markedly different densification behavior and fired ceramics. As the powders experienced increasing oxidation because of mixing, the densification temperature decreased, the amount of residual glass increased, and α‐SiAlON was destabilized and replaced by β‐SiAlON and AlN polytypes during hot pressing. These effects were mitigated when pyridine, nitrogen, and sonication were used. Several protocols that yielded nearly phase‐pure, glass‐free dense α‐SiAlON were thus identified.