Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : thermal diffusivity

The Effect of Ferrite Content on the Thermomechanical and Dielectric Strength Properties of Epoxy Composite

Lamees S. Faiq; Zahraa F. Attiyah

Engineering and Technology Journal, 2016, Volume 34, Issue 1, Pages 186-192

Different concentrations of cadmium ferrite (2%, 5%, 8%, 10% and 15%) were incorporated into epoxy resin. Cadmium ferrite was prepared by conventional ceramic technique. Composites are prepared by mixing the ferrite with epoxy by hand lay - up method at different percentages. The effect of ferrite content on tensile strength, hardness, thermal properties such thermal conductivity, thermal diffusivity and specific heat beside the dielectric strength were investigated. Using ferrite powders as filler to form particulate composite could lead to composite properties improvement. All the measured properties were improved with the increasing of the filler content. The results showed the important role of perfect adhesion between the filler and the polymer on the composite properties. It is found that the uniform distribution of filler particles in all directions of composite leads to the improved properties.

Thermal Properties of Recycle Aggregate Concrete with Different Densities

Amer M. Ibrahim; Shakir A. Al-Mishhadani; Noor Al Huda H. Ahmed

Engineering and Technology Journal, 2015, Volume 33, Issue 9, Pages 2027-2038

The present research intended to determine thermal properties (thermal
conductivity, thermal diffusivity and specific heat) of concrete manufactured by recycle waste of clay brick and thermostone for using it as aggregate after crushing process. For this purpose, three concrete mixes were prepared one of them using crushed clay brick as aggregate and two others were used crushed thermostone as aggregate too, these three mixes compared with reference normal concrete mix.
Specific heat was measured by using semi-adiabatic calorimeter method whereas thermal diffusivity was measured by using heating-cooling system. Thermal conductivity was obtained by multiplying the thermal diffusivity, specific heat and density. From experimental laboratory work, it was concluded that the thermal diffusivity increase with concrete density increment, but the specific heat was decreased with concrete density increment. Thermal conductivity had a linear relationship with thermal diffusivity. Mixing ratio also had an influence on thermal properties of concrete.