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Synthesis of ZrB 2 Powders from ZrO 2 , BN , and C
Author(s) -
Yan Chunlei,
Liu Rongjun,
Zhang Changrui,
Cao Yingbin,
Long Xianhai
Publication year - 2016
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.14027
Subject(s) - materials science , stoichiometry , boron , impurity , chemical engineering , reagent , phase (matter) , chemistry , engineering , organic chemistry
Submicrometer (200–800 nm) ZrB 2 powders have been successfully prepared via a new ZrO 2 –C– BN precursor powder system at a relatively low temperature (1550°C) for 1.5 h. As a moderate cost boron source, BN has a well‐defined stoichiometry and low impurity. Both thermodynamic and experimental results indicated that ZrC was formed below 1300°C, a temperature required for ZrB 2 formation. Moreover, the reaction of ZrC– BN mixture at 1300°C indicated that the ZrC acted as an effective direct reducing reagent for BN to form ZrB 2 , indicating that the pathway involving the formation of intermediate phase ZrC determined the formation mechanism.