Design for reliability of ferrite for electronics materials

Choi, Hyoung-Seuk; Kim, Kang-Dong; Jang, Joong-Soon

doi:10.1007/s13391-011-0310-9

Cited by 9 publications

(5 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One of the drawbacks of hexaferrites is their ceramic nature that makes them not flexible and moldable. However, for some applications for instance; in magnetomechanical transducers and in surface-mounted devices (SMD) such as inductors and transformer cores [30], materials must possess appropriate mechanical strength requiring precise control of the microstructure. Therefore, it is of major interest to study the mechanical properties of hexaferrites, which can give a broad insight into their microstructure.…”

Section: Introductionmentioning

confidence: 99%

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

Rekaby

Shehabi

Awad

2020

Mater. Res. Express

View full text Add to dashboard Cite

Nano-scale particles of pure Barium hexaferrite 'BaFe 12 O 19 ' and Cobalt added Barium hexaferrite 'Co x BaFe 12 O 19 ', with x=0.04, 0.06 and 0.1 wt%, were successfully synthesized by the chemical coprecipitation method. The synthesized powder was subjected to different calcination temperatures (T=850°C, 900°C, 950°C and 1050°C). X-ray powder diffraction (XRD) clarified that nearly single phase of BaFe 12 O 19 with tiny traces of Fe 2 O 3 phase were obtained when the precursor was calcined at 1050°C for 2 h. The lattice parameters and unit cell volume were almost unchanged with either Cobalt addition or calcination temperatures. From Debye-Scherrer equation, the crystallite size (D) was found to gradually increase with increasing calcination temperature to reach its maximum values for samples calcined at 1050°C. The formation of Barium hexaferrite phase was also confirmed from Fourier transform infrared (FTIR) spectra through the existence of strong absorption peaks that appeared between 581 cm −1 and 435 cm −1 . The morphology and grain size of the samples were examined using transmission electron microscopy (TEM) technique. Optical properties of the samples were studied through ultraviolet 'UV' visible spectroscopy. The optical band gap (E g ) of the samples was obtained from Tauc relation as function of Cobalt addition (x) and calcination temperature (T). Finally, the mechanical properties were examined using Vickers microhardness. The microhardness data revealed that the samples exhibited reverse indentation size effect (RISE). The Elastic modulus (E) and yield strength (Y) for the prepared samples were calculated, in accordance with Vickers microhardness, as function of Cobalt addition. Furthermore, the indentation size effect ISE was analyzed using indentation induced cracked model (IIC). The IIC model was found to be a suitable model for describing the microhardness results of the prepared samples. Time dependent Vickers microhardness was done through indentation creep test at different dwell time (t=10, 20, 30, 40 and 50 s) and constant applied loads (F=0.98, 4.90 and 9.80 N). Results clarified that the specimens revealed grain boundary sliding together with dislocation climbs at small loads and a dislocation creep in the operating creep process for greater loads.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

Rekaby

Shehabi

Awad

2020

Mater. Res. Express

View full text Add to dashboard Cite

show abstract

“…Typically, the surface crack is initiated and appears along the inner radius of the drum core [2]. The temperature change causes thermal stress between the ferrite core and the magnetic resin [3]. The interaction between geometric factors and the temperature change affect the reliability of the electronic package [4].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Thermal-Shock Reliability of a Sleeveless Power Inductor Assembly upon Reflow Soldering

Fajrina¹,

Sjafrizal²,

Anugraha³

2019

Proceedings of the 2019 1st International Conference on Engineering and Management in Industrial System (ICOEMIS 2019)

View full text Add to dashboard Cite

Employing magnetic resin in between the upper and bottom flange of a drum core is proven design in boosting the performance of a power inductor. The optimum core design and magnetic resin characteristic were investigated to improve the thermal shock reliability of the component upon reflow soldering. Finite element modelling (FEM) was utilised to simulate the response of the assemblies to the variations of the core inner radius (r c), upper flange thickness (t) and the coefficient of thermal expansion of magnetic resin (CTE mr). The assessment of those designs was conducted at a reflow oven, modelled by the computational fluid dynamic technique (CFD), on sixteen designs generated by the orthogonal array. The results showed that the inner radius of the drum core was the most vital parameter in designing a drum core in preventing core crack upon reflow soldering. The optimum design of the drum core was obtained at 0.5 mm inner radius of drum core, 0.3 mm upper flange thickness and 2.8 ppm/K coefficient thermal expansion of magnetic resin. Those findings may be used as a reference for designing a similar drum core of a power inductor.

show abstract

“…However, for some applications in magnetomechanical sensors, the material must have adequate mechanical strength, which requires strict control of the microstructure. The study of the mechanical properties of the ferrites is important not only for the development of ferrite magnetomechanical transducers but also for the development of surface-mounted devices (SMD) such as inductors and transformer cores 9 . Ni-Co ferrites have spinel AB 2 O 4 crystal structure, in which the oxygen anions are arranged in an FCC lattice and the Fe, Ni, and Co cations are distributed in one-eighth of the tetrahedral (A) and one-half of the octahedral (B) and interstitial sites.…”

Section: Introductionmentioning

confidence: 99%

Mechanical, Magnetic, and Microstructural Characterization of Ni0.9Co0.1Fe2O4 Produced by the Ceramic Method

et al. 2018

View full text Add to dashboard Cite

Ni-Co ferrites, especially the ones with lower cobalt fractions, are candidate materials for applications in magnetomechanical sensors and electromagnetic wave absorbers. This work studied the microstructure, magnetostriction, flexural strength, and complex magnetic permeability of Ni 0.9 Co 0.1 Fe 2 O 4 , presenting data that weren't covered by previous literature on this composition. It was found that sieving the calcined powder before the forming operation increased the flexural strength of the ceramic. The Ni-Co ferrite had a saturation magnetostriction of 36ppm. The real part of the complex magnetic permeability varied between 2.2-2.3 in frequencies from 100MHz to 1GHz. In frequencies higher than 1GHz, µ' decreased sharply and reached 1 at 3.9GHz. It was found that the grinding media provided a small fraction of Al to the ferrite composition, which apparently affected the complex magnetic permeability of the material but the magnetostriction results were very close to Al-free Ni-Co ferrites with similar composition.

show abstract

Design for reliability of ferrite for electronics materials

Cited by 9 publications

References 3 publications

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

Enhancing Thermal-Shock Reliability of a Sleeveless Power Inductor Assembly upon Reflow Soldering

Mechanical, Magnetic, and Microstructural Characterization of Ni0.9Co0.1Fe2O4 Produced by the Ceramic Method

Contact Info

Product

Resources

About

Design for reliability of ferrite for electronics materials

Cited by 9 publications

References 3 publications

Influence of cobalt addition and calcination temperature on the physical properties of BaFe12O19 hexaferrites nanoparticles

Influence of cobalt addition and calcination temperature on the physical properties of BaFe12O19 hexaferrites nanoparticles

Enhancing Thermal-Shock Reliability of a Sleeveless Power Inductor Assembly upon Reflow Soldering

Mechanical, Magnetic, and Microstructural Characterization of Ni0.9Co0.1Fe2O4 Produced by the Ceramic Method

Contact Info

Product

Resources

About

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles

Influence of cobalt addition and calcination temperature on the physical properties of BaFe₁₂O₁₉ hexaferrites nanoparticles