Fabrication of Permittivity Graded Epoxy Resin with Non-Uniform Dispersion of Alumina Fillers by a Centrifugal Procedure

Hayashi, Noriyuki; Onoda, Tomohiko; Sakamoto, Yasushi; Tsuru, S.; Kawabe, Takahiro; Hara, Masanori

doi:10.4028/www.scientific.net/msf.492-493.501

Cited by 6 publications

(6 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As values of ρ p = 3.99×10 3 kg/m 3 and ρ m = 1.1×10 3 kg/m 3 are given by the composition of the present target FGMs, α and β can be independently determined from each other. Relations of α ≤ 10 5 and β ≥ 10 5 are obtained under the conditions of N op = 500 -3000 rpm, η = 1 -50 Pa • s, D=1 -200 µm that were used in the practical fabrication of FGM [4]. Accordingly, α/β 2 1 is satisfied, so that the following relations come into effect.…”

Section: Approximate Solution Under Limited Conditionsmentioning

confidence: 95%

“…Numerical results obtained from the 3-dimensional analysis under the practical centrifugal conditions [4] indicated that those forces other than the following three forces, the centrifugal force, the drag force, and the buoyancy, had less influence on the movement of particles, and consequently, they were negligible in the future work. In the end, a one-dimensional equation of…”

Section: Description Of Simulation Model and Governing Equationmentioning

confidence: 98%

“…Based on the results of experimental works [4], the model space was divided into two layers, as shown in Fig. 1(b).…”

Section: Description Of Simulation Model and Governing Equationmentioning

confidence: 99%

“…Numerical simulation was conducted under the same conditions as practical centrifugal process involved in the FGM fabrication procedure from the alumina/epoxy mixture [4], employing a set of non-spherical alumina fillers with the nominal diameter D n = 50 µm. In the simulation, Eq.…”

Section: Numerical Solutionmentioning

confidence: 99%

“…The authors have applied a centrifugal method to fabricate FGMs from the alumina/epoxy mixture, which have gradient profiles of dielectric constant [4]. Experimental works on FGM fabrications by the centrifugal method have indicated that there are many parameters (e.g., centrifugal conditions and mixture conditions) which significantly affect the fabrication process and the resultant gradient in FGM properties.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Numerical Simulation of a Centrifugal Process to Fabricate Permittivity Graded FGM from Alumina/Epoxy Mixture

Tsuru¹,

Hayashi

Onoda³

et al. 2005

MSF

View full text Add to dashboard Cite

A new numerical method to simulate the centrifugal process of fabricating functionally graded materials (FGMs) from solid-particles/viscous-matrix mixtures is proposed, and the simulation method was successfully applied to a practical fabrication process of FGM from an alumina-fillers/epoxy-resin mixture. Gradient profiles of dielectric constant of the resultant FGM were estimated by using the proposed method and compared with the experimental ones, resulting in reasonable agreement between them. Based on the numerical results, gradient pro- files of the number density and size of the dispersed fillers were confirmed, and contribution of the filler size toward the gradient in the packing fraction was demonstrated. It is concluded that the gradient in the filler distribution can be intentionally regulated by changing not only the centrifugal conditions, but also the size distribution of the fillers.

show abstract

Section: Approximate Solution Under Limited Conditionsmentioning

confidence: 95%

Section: Description Of Simulation Model and Governing Equationmentioning

confidence: 98%

“…Based on the results of experimental works [4], the model space was divided into two layers, as shown in Fig. 1(b).…”

Section: Description Of Simulation Model and Governing Equationmentioning

confidence: 99%

Section: Numerical Solutionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Simulation of a Centrifugal Process to Fabricate Permittivity Graded FGM from Alumina/Epoxy Mixture

Tsuru¹,

Hayashi

Onoda³

et al. 2005

MSF

View full text Add to dashboard Cite

show abstract

Improved method to simulate gradient in alumina packing fraction in alumina/epoxy composite fabricated by a centrifugal method

Hayashi

Sugahara

Tsuru

et al. 2006

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

A centrifugal method was used to fabricate large‐scale functionally graded materials (FGMs) from solid‐particles/viscous‐matrix mixtures at room temperature. The conventional simulation procedure of the centrifugal process was improved by considering the dependency of the viscosity η of the mixture on the packing fraction νp of particle, the effects of arbitrary shape of the actual fillers on η, the statistical dispersion of the diameters of the actual fillers, and the formation and growth of the fully packed layer (FPL) near the FGM bottom. The new simulation method was applied to three centrifugal processes employed for experimental FGM fabrications from alumina/epoxy mixtures. The numerical profiles of νp are in good agreement with the experimental ones regardless of the shapes of fillers and 'ponding viscosity of the solutions without fillers, the total amount of fillers loaded, and the centrifugal conditions. The saturating nature of νp near the far end of the FGM column is also simulated with reasonable precision. Finally, the manner in which the particles exert varying influences on the gradient of νp is demonstrated: the particles exhibit different movements depending on their size. On the basis of these results, the effectiveness of the new simulation method proposed is confirmed for the modeling of similar processes involved in the fabrication of FGMs from solid‐particles/viscous‐matrix mixtures by the centrifugal method. © 2006 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

show abstract

Numerical Simulation of a Centrifugal Process to Fabricate Spherical-Alumina Graded Epoxy Resin

Hayashi

Sugahara

Hara

2006

2006 IEEE 8th International Conference on Properties and Applications of Dielectric Materials

View full text Add to dashboard Cite

Fabrication of Permittivity Graded Epoxy Resin with Non-Uniform Dispersion of Alumina Fillers by a Centrifugal Procedure

Cited by 6 publications

References 5 publications

Numerical Simulation of a Centrifugal Process to Fabricate Permittivity Graded FGM from Alumina/Epoxy Mixture

Numerical Simulation of a Centrifugal Process to Fabricate Permittivity Graded FGM from Alumina/Epoxy Mixture

Improved method to simulate gradient in alumina packing fraction in alumina/epoxy composite fabricated by a centrifugal method

Numerical Simulation of a Centrifugal Process to Fabricate Spherical-Alumina Graded Epoxy Resin

Contact Info

Product

Resources

About