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High‐Strength ZrC Ceramics Doped with Aluminum
Author(s) -
Wang XinGang,
Zhang GuoJun,
Zhao Jian,
Xue JiaXiang,
Xu ChangMing,
Wang PeiLing
Publication year - 2014
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.13252
Subject(s) - materials science , ceramic , hot pressing , fracture toughness , phase (matter) , flexural strength , composite material , microstructure , relative density , aluminium , metallurgy , chemistry , organic chemistry
High‐strength ZrC ceramics with relative density above 98% were prepared by reactive hot pressing of ZrC and Al at 1900°C. The reaction between ZrC and Al resulted in the formation of ZrC 1− x , Zr 3 Al 3 C 5 and Zr – Al compound such as AlZr 3 and Al – C – Zr . The intermediate product AlZr 3 below 1600°C and remained Al – C – Zr phase could form liquid phase and promoted the first stage of densification process. The improvement in densification behavior at higher temperatures (1800°C–1900°C) could be attributed to the formation of nonstoichiometric ZrC 1− x . Adding 5 wt% and 7.5 wt% Al to ZrC , the formed ZrC 0.85 – Zr 3 Al 3 C 5 and ZrC 0.80 – Zr 3 Al 3 C 5 based ceramics had 3‐point bending strength as high as 757 ± 79 MPa and 967 ± 50 MPa, respectively, with hardness and fracture toughness being 16.2–18.3 GPa and 3.3–3.5 MPa m 1/2 , respectively.