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Powder characteristics, sinterability, and mechanical properties of TiB 2 prepared by three reduction methods
Author(s) -
Zeng LingYong,
Wei WanXin,
Sun ShiKuan,
Guo WeiMing,
Li Hao,
Lin HuaTay
Publication year - 2019
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.16377
Subject(s) - carbothermic reaction , sintering , materials science , microstructure , carbon fibers , ceramic , reduction (mathematics) , metallurgy , phase (matter) , oxygen , composite material , chemistry , composite number , carbide , geometry , mathematics , organic chemistry
Reaction processes, powder characteristics, sinterability, and mechanical properties of TiB 2 prepared by borothermal reduction, B 4 C reduction, and boro/carbothermal reduction were compared. Results showed that TiBO 3 and Ti 2 O 3 as the intermediate phases existed in the three reduction processes. The temperature where TiB 2 became major phase was lowest during borothermal reduction, resulting in the finest TiB 2 particle size, in contrast to the other two methods, especially boro/carbothermal reduction. However, TiB 2 powders prepared by B 4 C reduction and boro/carbothermal reduction after pressureless sintering at 1800°C for 2 hours showed the relatively higher sinterability, due to the lower oxygen content and higher carbon content. Finally, using 5 wt% Ni as sintering additive, hot‐pressed TiB 2 ceramics from B 4 C reduction demonstrated higher densification, more fine‐grained microstructure and higher mechanical properties, due to the better balance of oxygen/carbon content.