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Influence of Rare‐Earth Additives on Wear Properties of Hot‐Pressed Silicon Nitride Ceramics under Dry Sliding Conditions
Author(s) -
Hyuga Hideki,
Jones Mark I.,
Hirao Kiyoshi,
Yamauchi Yukihiko
Publication year - 2004
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.1551-2916.2004.01683.x
Subject(s) - materials science , sintering , silicon nitride , ceramic , lubricant , rare earth , metallurgy , composite material , silicon , grain boundary , microstructure
The influence of different rare‐earth sintering additives (Y, Yb, Lu) on the wear properties of Si 3 N 4 ceramics was investigated during sliding contact without lubricant. The kind of rare‐earth additives was shown to have a significant effect on the wear behavior for contact sliding under the present testing conditions. Samples sintered with Y 2 O 3 as the sintering additive showed evidence of fracture type wear although this was not observed in samples sintered with Yb 2 O 3 and Lu 2 O 3 . These smaller rare earths lead to higher grain boundary bonding strength and superior high‐temperature properties and resulted in higher wear resistance. These results showed that the wear properties of Si 3 N 4 ceramics could be tailored by judicious selection of the sintering additives.