Effect of sintering atmosphere on composition and properties of NiFe2O4 ceramic
来源期刊：中南大学学报(英文版)2015年第2期
论文作者：TIAN Zhong-liang(田忠良) ZHANG Teng(张腾) LIU Kai(刘恺) 赖延清 LI Jie(李劼)
文章页码：450 - 454
Key words：NiFe2O4 ceramic; microstructure; mechanical property; sintering atmosphere
Abstract: NiFe2O4 ceramics were prepared in different sintering atmospheres. The phase compositions, microstructures and mechanical properties were studied. The results show that the stoichiometric compound NiFe2O4 cannot be obtained in vacuum or atmospheres with oxygen contents of 2×10-5, 2×10-4 and 2×10-3, respectively. All the samples sintered in above-mentioned atmospheres contain phases of NiFe2O4 and NiO. With increasing oxygen content, NiFe2O4 content in the ceramic increases, while NiO content appears a contrary trend. In vacuum, NiFe2O4 ceramic has average grain size of 3.94 μm, and bending strength of 85.12 MPa. The changes of the phase composition and mechanical properties of NiFe2O4 based cermets are mainly caused by the alteration of their properties of NiFe2O4 ceramic.
TIAN Zhong-liang(田忠良), ZHANG Teng(张腾), LIU Kai(刘恺), LAI Yan-qing(赖延清), LI Jie(李劼)
(School of Metallurgy and Environment, Central South University, Changsha 410008, China)
Abstract:NiFe2O4 ceramics were prepared in different sintering atmospheres. The phase compositions, microstructures and mechanical properties were studied. The results show that the stoichiometric compound NiFe2O4 cannot be obtained in vacuum or atmospheres with oxygen contents of 2×10-5, 2×10-4 and 2×10-3, respectively. All the samples sintered in above-mentioned atmospheres contain phases of NiFe2O4 and NiO. With increasing oxygen content, NiFe2O4 content in the ceramic increases, while NiO content appears a contrary trend. In vacuum, NiFe2O4 ceramic has average grain size of 3.94 μm, and bending strength of 85.12 MPa. The changes of the phase composition and mechanical properties of NiFe2O4 based cermets are mainly caused by the alteration of their properties of NiFe2O4 ceramic.
Key words:NiFe2O4 ceramic; microstructure; mechanical property; sintering atmosphere
