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Effect of Silicon Carbide Whisker and Titanium Carbide Particulate Additions on the Friction and Wear Behavior of Silicon Nitride
Author(s) -
Blanchard Cheryl R.,
Page Richard A.
Publication year - 1990
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.1151-2916.1990.tb06473.x
Subject(s) - materials science , whisker , silicon carbide , silicon nitride , titanium carbide , composite number , whiskers , carbide , titanium , fracture toughness , composite material , wear resistance , metallurgy , silicon , toughness , friction coefficient , coefficient of friction
A Si 3 N 4 /TiC composite was previously demonstrated to exhibit improved wear resistance compared to a monolithic Si 3 N 4 because of the formation of a lubricious oxide film containing Ti and Si at 900°C. Further improvements of the composite have been made in this study through additions of SiC whiskers and improved processing. Four materials—Si 3 N 4 , Si 3 N 4 /TiC, Si 3 N 4 /SiC wh , and Si 3 N 4 /TiC/SiC wh — were processed to further optimize the wear resistance of Si 3 N 4 through improvements in strength, hardness, fracture toughness, and the coefficient of friction. Oscillatory pin on flat wear tests showed a decrease in the coefficient of friction from ∼0.7 (Si 3 N 4 ) to ∼0.4 with the addition of TiC at temperatures reaching 900°C. Wear track profiles illustrated the absence of appreciable wear on the TiC‐containing composites at temperatures above 700°C. Microscopic (SEM) and chemical (AES) characterization of the wear tracks is also included to deduce respective wear and lubricating mechanisms.