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Improved Oxidation Resistance of Zirconium Carbide at 1500°C by Lanthanum Hexaboride Additions
Author(s) -
Zhao Liyou,
Jia Dechang,
Duan Xiaoming,
Yang Zhihua,
Zhou Yu
Publication year - 2011
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.1551-2916.2011.04830.x
Subject(s) - materials science , oxide , zirconium carbide , carbide , zirconium , lanthanum , metallurgy , phase (matter) , thermal stability , chemical engineering , relative density , zirconium oxide , inorganic chemistry , microstructure , chemistry , organic chemistry , engineering
Addition of LaB 6 is adopted to improve the oxidation resistance of ZrC at 1500°C. Mixed powder of ZrC ‐25 vol% LaB 6 is reactively hot pressed at 1900°C for 30 min under vacuum with an applied pressure of 25 MPa. The LaB 6 reacts with ZrC to form ZrB 2 and a layered La ‐containing phase. ZrB 2 improves the oxidation resistance of ZrC in static air. The La ‐containing phase is beneficial to increasing the relative density of oxide scale during oxidation and in enhancing the oxide scale stability during exposure to thermal cycles.