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Mechanical Properties and Oxidation Behavior of Al 2 O 3 –AlN–TiN Composites
Author(s) -
Gogotsi Yury G.,
Porz Franz,
Yaroshenko Viktor P.
Publication year - 1992
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.1151-2916.1992.tb04492.x
Subject(s) - materials science , tin , composite material , ceramic , fracture toughness , rutile , oxide , spallation , toughness , aluminium , microstructure , metallurgy , chemical engineering , physics , quantum mechanics , neutron , engineering
The study examines the effect which the composition of hot‐pressed electroconductive ceramics has on their structure, mechanical properties, and oxidation behavior, for ceramics of the type AIN–Al 2 O 3 –42 wt% TiN, differing in the AIN/Al 2 O 3 ratio. The results are physico‐mechanical property data, including density, hardness, strength, fracture toughness, and wear resistance. A correlation was found between the wear resistance and fracture toughness. The analysis of oxidation products revealed the formation of α‐Al 2 O 3 and rutile in the temperature range from 600° to 1100°C and aluminum titanate above 1200°C. The spallation of the oxide layer caused low oxidation resistance of Al 2 O 3 ‐rich composites above 1250°C. The oxidation of composites was compared with the oxidation of pure TiN. The relationship is discussed between material properties, composition, phases, and processing parameters.