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The influence of carbon on the microstructure and wear resistance of alumina
Author(s) -
Marder Rachel,
Ghosh Priyadarshini,
Reimanis Ivar,
Kaplan Wayne D.
Publication year - 2021
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/jace.17832
Subject(s) - sintering , materials science , graphite , microstructure , grain size , carbon fibers , abrasive , metallurgy , grain growth , particle size , crystallite , diamond , composite material , composite number , chemical engineering , engineering
The influence of carbon as a dopant on grain growth and wear resistance of polycrystalline alumina was evaluated. Carbon was introduced into alumina by sintering in a carbon‐rich environment (graphite furnace under flowing He), and/or by residual carbon from organic binders used during the green body consolidation process. Samples were sintered at 1600°C for 2 h. Doping alumina with carbon resulted in a reduced grain size after sintering, correlated to solute‐drag, and graphite particle‐drag for high concentrations of carbon (~3 wt.%). The material response to abrasive wear was quantified by measuring the sample area cut for a defined time using a diamond wafering saw, as a function of grain size and carbon content. Sintering alumina with carbon resulted in a significant increase in wear resistance, as a result of the reduced grain size.