Magnetic negative permittivity with dielectric resonance in random Fe3O4@graphene-phenolic resin composites

Polymer matrix composites made from phenolic resin are filled with natural graphite powders. They are fabricated by compression molding technique. The density, electrical conductivity and flexural strength of composite are analyzed to determine the influences of mould pressure and mould pressing time on the physical, electrical and mechanical properties of composite. It is found that the density, electrical conductivity and flexural strength of composites increased with increasing mould pressure. Under pressure of 40 MPa for 60 min, the density, electrical conductivity and flexural strength of composites were 1.85 g/cm3, 4.35  103 S/cm and 70 MPa, respectively. The decreased gaps could be the main reason for the increasing of density, electrical conductivity and flexural strength as mould pressure increases. The results also show that the density of composites increased with increasing mould pressing time.

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Thermal conductivity of fibre-phenolic resin composites. Part I: Thermal diffusivity measurements

Composites Science and Technology ◽

10.1016/0266-3538(87)90070-4 ◽

1987 ◽

Vol 29 (3) ◽

pp. 189-210 ◽

Cited By ~ 31

Author(s):

J.T. Mottram ◽

R. Taylor

Keyword(s):

Thermal Conductivity ◽

Thermal Diffusivity ◽

Phenolic Resin ◽

Resin Composites ◽

Diffusivity Measurements

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Wet vs. Dry Dispersion Methods for Multiwall Carbon Nanotubes in the High Graphite Content Phenolic Resin Composites for Use as Bipolar Plate Application

Electrochimica Acta ◽

10.1016/j.electacta.2015.01.101 ◽

2015 ◽

Vol 158 ◽

pp. 1-6 ◽

Cited By ~ 10

Author(s):

Pattarakamon Chaiwan ◽

Jantrawan Pumchusak

Keyword(s):

Carbon Nanotubes ◽

Phenolic Resin ◽

Multiwall Carbon Nanotubes ◽

Bipolar Plate ◽

Resin Composites ◽

Graphite Content ◽

Multiwall Carbon ◽

High Graphite

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Microstructure and Properties of Porous CMCs Prepared by HIPing the Pyrolyzed ZrO2/ Si / Phenol Resin Composite

Materials Science Forum ◽

10.4028/www.scientific.net/msf.561-565.747 ◽

2007 ◽

Vol 561-565 ◽

pp. 747-750 ◽

Cited By ~ 1

Author(s):

Muhammad Akhtar Sharif ◽

Hidekazu Sueyoshi

Keyword(s):

Phenolic Resin ◽

Resin Composite ◽

Atomic Ratio ◽

Argon Atmosphere ◽

Second Step ◽

Resin Composites ◽

Maximum Hardness ◽

Phenol Resin ◽

Microstructure And Properties ◽

Bulk Hardness

A novel two-step process was used to investigate the microstructure and properties of porous CMCs prepared by HIPing the pyrolyzed composites of commercially available ZrO2 (TZ- 3YS), silicon powders and phenolic resin. In the first step, preforms with 70, 80 and 90 mass % of ZrO2 powders were prepared by the pyrolysis of ZrO2 / Si / Phenol Resin composites at 850 oC in vacuum. And, then the pyrolyzed preforms were HIPed at 1400 oC for 30 minutes in Argon atmosphere under a pressure of 50 MPa to fabricate the porous CMCs, in the second step. XRD analyses suggested the formation of β-SiC in the composites below the melting point of silicon. SEM photographs showed that spherical pores of several μm in diameter were uniformly distributed in the matrices of composites and crystals of β-SiC with facets were observed in the pores. EDS analyses showed that the crystals were composed of Si and C with 1 : 1 atomic ratio suggesting that crystal are SiC. The maximum hardness (13.78 GPa) was achieved from the composite with 90 mass % ZrO2, which is more than that of bulk hardness of ZrO2 (10-12 GPa).

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