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Fabrication of high‐density NiFe 2 O 4 ceramics by slip casting and pressureless sintering
Author(s) -
Zhang Zhigang,
Xu Jianrong,
Cao Zhuokun,
Yao Guangchun
Publication year - 2020
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13514
Subject(s) - materials science , green body , slip (aerodynamics) , sintering , microstructure , ceramic , slurry , composite material , homogeneity (statistics) , shrinkage , tape casting , statistics , physics , mathematics , thermodynamics
High‐density NiFe 2 O 4 ceramics with homogeneous microstructure were produced by slip casting and pressureless sintering. The slurry stability, sintering behavior, and microstructure of NiFe 2 O 4 ceramics were investigated. A stable slurry can be obtained by adding 12.5 wt% NiFe 2 O 4 nanoparticle and 5 wt% nano‐binder at a slurry pH around 11.0. The linear shrinkage and linear shrinkage rate for both NiFe 2 O 4 ceramic green bodies shaped by cold press molding and slip casting showed nearly the same trends. The temperature associated with the maximum linear shrinkage rate of slip casted green body was 1263.5°C, which was lower than that of cold press molded sample (1272.0°C). The sintering activation energy of slip casted green body was also lower than that of cold press molded sample (279.18 vs 288.47 kJ mol −1 ), owing to high density and homogeneity of slip‐casted green compact. A high‐density NiFe 2 O 4 ceramics with uniform grain size distribution can be produced by slip casting and pressureless sintering at 1350°C for 6 hours, attributed to the ability of slip casting to minimize agglomerates and micropores. It demonstrated that slip casting was more suitable to prepare high‐density NiFe 2 O 4 ceramics with good homogeneity.