Shenzhen Zhenhua Fu Electronics Co.

Shenzhen, China

Shenzhen Zhenhua Fu Electronics Co.

Shenzhen, China

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Zhu J.,Shenzhen University | Ouyang C.,Harbin Institute of Technology | Xiao S.,Harbin Institute of Technology | Gao Y.,Shenzhen Zhenhua Fu Electronics Co.
Journal of Magnetism and Magnetic Materials | Year: 2016

This work reports the recent study on the microwave sintering (MS) versus conventional sintering (CS) of NiCuZn ferrites, with particular interests in the densification evolution. NiCuZn ferrite powders were synthesized through the solid state reaction route. Densification behaviors of ferrite samples under the two types of thermal sources were monitored in real-time. Meanwhile, the influences of additives (1wt% BSZ glass or 1wt% Bi2O3) on the densifications were also investigated. Both constant heating rate (CHR) and master sintering curve (MSC) models were used to evaluate the sintering activation energy (Q). Results demonstrated that the microwave-enhanced diffusion mainly occurs at the intermediate sintering stage. The Q-value estimated by MSC method agreed well with that from CHR method. With the influence of microwave electromagnetic field, the activation energy of NiCuZn ferrites was decreased by roughly 100-150kJ/mol. In addition, doping a small amount of additives could improve densification degree and reduce the minimal energy to activate diffusion mechanisms. © 2016 Elsevier B.V.


Ouyang C.X.,Harbin Institute of Technology | Ouyang C.X.,Shenzhen Zhenhua Fu Electronics Co. | Xiao S.,Harbin Institute of Technology | Zhu J.,Shenzhen Zhenhua Fu Electronics Co. | Wang H.,Shenzhen Zhenhua Fu Electronics Co.
Advances in Applied Ceramics | Year: 2016

This work reports our recent studies on the microstructure and properties of NiCuZn ferrites, with particular interests in effects of solid-state reaction temperature on the sintering activation energy and DC-bias superposition characteristic. The theory of master sintering curve was used to investigate the densification evolutions of NiCuZn ferrites during sintering process. Experimental results demonstrated that materials with solid-state reaction temperature of 850°C exhibited the lowest value of activation energy, 577.6 kJ mol−1. When the solid-state reaction temperature was lower than 800°C, reaction could not be perfectly completed, which would hinder the consolidation process during heating up. In addition, increased solid-state reaction temperature could facilitate the homogeneous grain growth, reduce the final grain size and improve DC-bias superposition characteristic. Possible mechanisms behind are discussed. © 2016 Institute of Materials, Minerals and Mining


Ouyang C.,Harbin Institute of Technology | Ouyang C.,Shenzhen Zhenhua Fu Electronics Co. | Xiao S.,Harbin Institute of Technology | Zhu J.,Shenzhen Zhenhua Fu Electronics Co. | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2016

NiCuZn ferrites with the composition of (Ni0.48Cu0.10Zn0.42O)1.04(Fe2O3)0.96 were consolidated by microwave sintering (MS) and conventional sintering (CS), respectively. The influences of external microwave field and additives (1 wt% BSZ glass or 1 wt% Bi2O3) on the microstructure and DC-bias superposition characteristics of NiCuZn ferrites were investigated. Experimental results demonstrated that the final grain size was much larger with higher density since applying microwave field. In addition, for undoped ferrites, coarse grains structure obtained from microwave sintering is harmful to the DC-bias superposition characteristics. However, since adding BSZ glass or Bi2O3, the discrepancy on the final grain size obtained from MS and CS methods is not obvious. NiCuZn ferrites with the addition of BSZ glass or Bi2O3 exhibited a stronger ability to inhibit the drop of permeability under the DC-bias magnetic field. Possible mechanisms behind are discussed in this article. © 2016 Elsevier B.V. All rights reserved.


Zhu J.,Shenzhen University | Zhu J.,Shenzhen Zhenhua Fu Electronics Co. | Ouyang C.,Harbin Institute of Technology | Ouyang C.,Shenzhen Zhenhua Fu Electronics Co. | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2016

This work reports the recent study on the microwave sintering (MS) versus conventional sintering (CS) of NiCuZn ferrites, with particular interests in the densification evolution. NiCuZn ferrite powders were synthesized through the solid state reaction route. Densification behaviors of ferrite samples under the two types of thermal sources were monitored in real-time. Meanwhile, the influences of additives (1 wt% BSZ glass or 1 wt% Bi2O3) on the densifications were also investigated. Both constant heating rate (CHR) and master sintering curve (MSC) models were used to evaluate the sintering activation energy (Q). Results demonstrated that the microwave-enhanced diffusion mainly occurs at the intermediate sintering stage. The Q-value estimated by MSC method agreed well with that from CHR method. With the influence of microwave electromagnetic field, the activation energy of NiCuZn ferrites was decreased by roughly 100-150 kJ/mol. In addition, doping a small amount of additives could improve densification degree and reduce the minimal energy to activate diffusion mechanisms. © 2016 Elsevier B.V. All rights reserved.

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