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Effect of Sintering Atmosphere on the Synthesis Process, Electrical and Mechanical Properties of NiFe2O4/Nano-TiN Ceramics

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Abstract

NiFe2O4/nano-TiN ceramics were fabricated by a two-step cold-pressing sintering process. Effect of sintering atmosphere (air, nitrogen, argon) on the synthesis process of NiFe2O4/nano-TiN ceramics was investigated. The DSC-TG and XRD analysis results indicated that besides principal phases of NiO and NiFe2O4, new-phase Ni3TiO5 formed in the sintered ceramics under the three sintering atmospheres, and metallic phase including iron and nickel appeared in the sintered samples with inert gas (nitrogen, argon) sintering condition. Microstructure analysis results showed that considerable quantity of micropores appeared in the ceramic samples sintered under inert gases (argon, nitrogen), but lower porosity (3.0, 3.6%) and higher densities (4.78 g/cm3, 4.51 g/cm3) can be obtained, comparing to the both values (14.4%, 4.17 g/cm3) for the ceramic samples sintered under air atmosphere. Besides, the average bending strength and elastic modulus of the samples sintered under argon is 113.75 MPa and 7.13GPa, which is higher than that of 75.12 MPa, 5.42GPa and 91.96 MPa, 6.26GPa for the samples synthesized under air and nitrogen, separately. When changing sintering atmosphere from air to inert gases (argon, nitrogen), the fracture model of the 4 wt.%nano-TiN/NiFe2O4 ceramics synthesized at 1400 °C for 4 h transformed from intergranular fracture to intergranular-transgranular fracture.

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Acknowledgment

The authors gratefully acknowledge the financial support from the National Natural Science Foundation of China (Nos. 51504177, 51574191, 51404183, 51404181), Foundation of Shaanxi Educational Committee (No. 14JK1425).

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Authors and Affiliations

  1. School of Metallurgy Engineering, Xi’an University of Architecture and Technology, 4, Box, Xi’an, 710055, China

    Bin Wang, Jinjing Du, Shoukun Gao, Zhao Fang, Jun Zhu & Linbo Li

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  1. Bin Wang
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Correspondence to Jinjing Du.

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Wang, B., Du, J., Gao, S. et al. Effect of Sintering Atmosphere on the Synthesis Process, Electrical and Mechanical Properties of NiFe2O4/Nano-TiN Ceramics. J. of Materi Eng and Perform 28, 423–430 (2019). https://doi.org/10.1007/s11665-018-3794-8

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  • DOI: https://doi.org/10.1007/s11665-018-3794-8

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