Fatigue of hybrid epoxy composites: Epoxies containing rubber and hollow glass spheres

1996 ◽  
Vol 36 (18) ◽  
pp. 2352-2365 ◽  
Author(s):  
H. R. Azimi ◽  
R. A. Pearson ◽  
R. W. Hertzberg
Keyword(s):  
Epoxy Composites ◽  
Hollow Glass ◽  
Glass Spheres

Light-weight carbon fiber/silver-coated hollow glass spheres/epoxy composites as highly effective electromagnetic interference shielding material

2021 ◽  
pp. 073168442110651
Author(s):  
Wei Chen ◽  
Yiliang Qin ◽  
Xingyang He ◽  
Ying Su ◽  
Jun Wang
Keyword(s):  
Carbon Fiber ◽  
Electromagnetic Interference ◽  
Epoxy Composites ◽  
Light Weight ◽  
Shielding Effectiveness ◽  
Electromagnetic Interference Shielding ◽  
Molding Process ◽  
Hollow Glass ◽  
Glass Spheres ◽  
Highly Effective

Highly effective electromagnetic interference shielding materials with light-weight feature are urgently demanded for releasing electromagnetic pollution. In this study, the hollow glass spheres were coated with silver particles to produce electrically conductive microspheres. The Carbon fiber/silver-coated hollow glass spheres (Ag@HGMs)/epoxy composites were manufactured by composites liquid molding process. The electromagnetic interference shielding properties of the composites were investigated in the X-band (8.2–12.4 GHz) range. The Ag@HGMs play a role in filling up the vacancy of the conductive network of carbon fibers in the composites, which not only form new conductive pathways but also act as bridges to connect CFs and provide additional channels for the electron transfer within the composites thus improving the electrical conductivity. The total shielding effectiveness (SET) increases with increasing Ag@HGMs loadings and the maximum SET is high as 88.1 dB. The increased SET dominated by absorption loss SEA is attributed to the high conductivity and multilayer construction of carbon fiber veil. The maximum specific SE of the carbon fiber/Ag@HGMs/epoxy composites can achieve 128.8 dB cm3/g, simultaneously the tensile strength and modulus can reach 95.6 MPa and 2.71 GPa, which provides a facile and promising strategy for designing and developing light-weight and high performance electromagnetic interference shielding materials.

Optical waveguide trapping forces on hollow glass spheres

2011 ◽  
Author(s):  
Pål Løvhaugen ◽  
Balpreet S. Ahluwalia ◽  
Olav G. Hellesø
Keyword(s):  
Optical Waveguide ◽  
Hollow Glass ◽  
Glass Spheres ◽  
Trapping Forces

Density and Drag Reduction With Hollow Glass Additives

2014 ◽  
Author(s):  
Bahri Kutlu ◽  
Evren M. Ozbayoglu ◽  
Stefan Z. Miska ◽  
Nicholas Takach ◽  
Mengjiao Yu ◽  
...  
Keyword(s):  
Drag Reduction ◽  
Rheological Behavior ◽  
Drilling Fluid ◽  
Hydraulic Drag ◽  
Effect Of Temperature ◽  
Survival Ratio ◽  
Fluid Density ◽  
Hollow Glass ◽  
Glass Spheres ◽  
Reduction Effect

This study concentrates on the use of materials known as hollow glass spheres, also known as glass bubbles, to reduce the drilling fluid density below the base fluid density without introducing a compressible phase to the wellbore. Four types of lightweight glass spheres with different physical properties were tested for their impact on rheological behavior, density reduction effect, survival ratio at elevated pressures and hydraulic drag reduction effect when mixed with water based fluids. A Fann75 HPHT viscometer and a flow loop were used for the experiments. Results show that glass spheres successfully reduce the density of the base drilling fluid while maintaining an average of 0.93 survival ratio, the rheological behavior of the tested fluids at elevated concentrations of glass bubbles is similar to the rheological behavior of conventional drilling fluids and hydraulic drag reduction is present up to certain concentrations. All results were integrated into hydraulics calculations for a wellbore scenario that accounts for the effect of temperature and pressure on rheological properties, as well as the effect of glass bubble concentration on mud temperature distribution along the wellbore. The effect of drag reduction was also considered in the calculations.

Evaluation of the Compressive Yield Strength of Hollow Glass Microsphere – Epoxy Composites as a Function of the Microsphere/ Epoxy Interface Strength

2007 ◽  
Vol 15 (6) ◽  
pp. 445-451 ◽  
Author(s):  
J.R.M. d'Almeida
Keyword(s):  
Yield Strength ◽  
Surface Treatment ◽  
Silicone Oil ◽  
Theoretical Models ◽  
Interface Strength ◽  
Glass Microsphere ◽  
Epoxy Composites ◽  
Compressive Yield Strength ◽  
Hollow Glass Microsphere ◽  
Hollow Glass

The compressive yield strength of glass microsphere – epoxy composites was evaluated as a function of the interface strength. The behaviour of composites with microspheres without any surface treatment was compared with that of composites fabricated with silane-treated and silicone oil-treated microspheres. Varying the hardener-to-epoxy ratio of the matrix also modified the interface. The results were compared with those derived from theoretical models, and it was shown that for hollow glass microsphere composites the effect of surface treatment can be quantitatively described using extant models. Changes in the reinforcing effect and stress concentration factor caused by the presence of the microspheres are discussed, and the experimental results explained.

Preparation and characteristics of Fe3O4 magnetic thin films plated on hollow glass spheres

2007 ◽  
Vol 61 (7) ◽  
pp. 1529-1532 ◽  
Author(s):  
Jianhua Liu ◽  
Jing Wei ◽  
Songmei Li
Keyword(s):  
Thin Films ◽  
Magnetic Thin Films ◽  
Hollow Glass ◽  
Glass Spheres

Thermal insulating epoxy composite coatings containing sepiolite/hollow glass microspheres as binary fillers: morphology, simulation and application

2017 ◽  
Vol 24 (3) ◽  
pp. 379-386 ◽  
Author(s):  
Jinwei Wang ◽  
Yunpei Tian ◽  
Jin Zhang
Keyword(s):  
Composite Coatings ◽  
Epoxy Composites ◽  
Mg Alloy ◽  
Inorganic Filler ◽  
Gravimetric Analysis ◽  
Glass Microspheres ◽  
Hollow Glass Microspheres ◽  
Element Analysis ◽  
Hollow Glass ◽  
Thermal Insulating

AbstractSepiolite and hollow glass microspheres (HGMs) are used as binary fillers to prepare thermal insulating composites to improve the protecting durability of epoxy composites on Mg alloy. Sepiolite can be evenly dispersed inside epoxy at around 10% (vol.%), while HGMs are also found evenly distributed in this matrix with content up to 45% (vol.%), as shown in the scanning electron microscope pictures. Their thermal stability and thermal insulation ability improve simultaneously with the increase of the inorganic filler, as shown in the thermal gravimetric analysis results and thermal insulting tests. According to the three-dimensional finite element analysis using ANSYS software (ANSYS Inc., USA), their thermal conductivity coefficients are found to decrease linearly with the increase in HGMs volume fractions. The tested temperature changes on the opposite side of the Mg alloy coated with sepiolite/HGMs/epoxy composites match well with those on the stimulant curves, indicating the reliability of the models and the thermal insulating functions provided by the fillers.

Cryogenic properties of hollow glass microsphere/epoxy composites

2012 ◽  
Author(s):  
Z. X. Wu ◽  
R. J. Huang ◽  
X. X. Chu ◽  
C. J. Huang ◽  
J. J. Zhang ◽  
...  
Keyword(s):  
Glass Microsphere ◽  
Epoxy Composites ◽  
Hollow Glass Microsphere ◽  
Hollow Glass
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