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 |  موضوع: بحث بعنوان Evaluation of Thermal Properties of E-glass/Epoxy Composites Filled by Different Filler Materials الخميس 01 يوليو 2021, 9:42 pm | |
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Evaluation of Thermal Properties of E-glass/ Epoxy Composites Filled by Different Filler Materials
Sachin Kumar Chaturvedi1,
1Assistant Professor,
Department of Mechanical Engineering,
Al-Falah University, Faridabad, Haryana
Email: sachin_techno@yahoo.co.in
Satendra Kumar2
2M.Tech. Research Scholar,
Department of Mechanical Engineering,
Al-Falah University, Faridabad, Haryana
و المحتوى كما يلي :
Abstract
Composites are engineered or naturally occurring materials made out of two or more constituents. To obtain the better
properties of composites material its individual constituents are modified. A composites material is difficult to carry
out due to the anisotropic and non-homogeneous structure of composites and to the high abrasiveness of their
reinforcing constituents. In this present work of the mechanical and thermal properties of E-glass/Epoxy composite
materials with fillers (Al2O3 and SiO2) has pointed to investigate the materials added to the matrix help amending the
mechanically operating properties and thermally affected of a composite. The results of various characterization tests
are reported here. This includes evaluation of tensile strength, torsion test, hardness test, thermal conductivity,
thermal expansion coefficient measurement, fire resistance test and flame propagation rate has been experimentally
recorded. As per the experimental results, this present work conclude that if we mixing 20% of Al2O3 or SiO2with 50%
of fiber and 30% of resins to make a composite material then we can easily see the SiO2have a greater mechanical
properties than Al2O3 , so this present work proposed to SiO2instead Al2O3 where the greater strength needed. It also
observed that composites filled by (20% Vol) Al2O3 and (25% Vol) SiO2exhibited low thermal conductivity it may be due
to that while heating of materials slow chemical reaction takes place in Al2O3 and SiO2and releases the small amount
of water and this released water resist the heat flow and seems possible that there is a fundamental difficult in
transferring heat from the matrix to the fibers. Increase the addition of Al2O3 and SiO2to composites reduces the
thermal expansion coefficient. It has been noticed that (25% Vol) Al2O3 and SiO2filled composite exhibited less thermal
expansion coefficient this may be by adding the more fillers in composite materials providing good filler matrix
interaction in the system, the filler binds the matrix and prevents it from expanding as much as it would on its own.
The flammability of composites is reduces when addition of thermally active fillers like oxides to the polymer matrix is
tried. From the results it is observed that increase the loading of SiO2increase the time to ignition and reduces the
flame propagation rate because Al2O3 and SiO2is active in both the condensed and gas phases of the combustion
process and it is remarkably effective in suppressing flaming combustion and smoke.
Keywords: Thermal Properties, E-Glass/Epoxy, Composite Materials
As per the above experimental results, this present work conclude the following
1. Thermal conductivity: From the obtained results it is observed that composites filled by (20% Vol)
Al2O3 and (25% Vol) SiO2 exhibited low thermal conductivity it may be due to that while heating of
materials slow chemical reaction takes place in Al2O3 and SiO2 and releases the small amount of water
and this released water resist the heat flow and seems possible that there is a fundamental difficult in
transferring heat from the matrix to the fibers.
2. Thermal Expansion Coefficient: From the experimental results it is observed that increase the
addition of Al2O3 and SiO2 to composites reduces the thermal expansion coefficient. It has been
noticed that (25% Vol) Al2O3 and SiO2 filled composite exhibited less thermal expansion coefficient this
may be by adding the more fillers in composite materials providing good filler matrix interaction in the
system, the filler binds the matrix and prevents it from expanding as much as it would on its own.
Subsequently, this would affect the thermal expansion of the composite system. The many studies
have shown that materials with higher filler content leads to a lower thermal expansion coefficient.
3. Time to Ignition and Flame Propagation Rate: The flammability of composites is reduces when
addition of thermally active fillers like oxides to the polymer matrix is tried. From the results it is
observed that increase the loading of SiO2 increase the time to ignition and reduces the flame
propagation rate because Al2O3 and SiO2 is active in both the condensed and gas phases of the
combustion process and it is remarkably effective in suppressing flaming combustion and smoke. The
main condensed phase mechanism of alumina oxide and silica oxide is the absorption of heat when
the filler decomposes.
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