Thermophysical properties of a novel copper reinforced oil palm shell (OPS) composite: Effect of copper volume fraction and temperature (original) (raw)
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Recently, thermoplastic and thermoset polymers are combined with natural fibers to produce the composites, which possess better strength and good resistance to fracture. Due to an excellent property profile, these composites find wide applications in packaging, building and civil engineering fields. The present work aims to elucidate the optimization of thermal properties such as thermal conductivity, specific heat.Thermal degradation measurement by Thermo-Gravimetric Analysis (TGA) and Thermal Diffusivity of Palmyra reinforced polymer composites with chemical treatment and addition of copper powder materials. The composite specimens were prepared with different weight percentages of palmyra fiber and copper powder in polymer matrix. Keywords: Palmyra fiber, natural composite, Chemical treatment, Copper powder, Thermal properties.
Fabrication, Microstructure, Thermal and Electrical Properties of Copper Heat Sink Composites
Copper as well as copper base composites reinforced with coated and uncoated 1 wt% diamond, graphite particles or short carbon fibers are prepared by powder metallurgy process. The reinforcement particles were encapsulated with silver as well as copper layer by using the electroless deposition technique to investigate the influence of the reinforcement surface coating on the microstructure, density, electrical and thermal properties of the sintered samples. The coated and the uncoated powders were cold compacted at 600 MPa, and then sintered at 1173 K (900˚C) for 2 h under hydrogen atmosphere. The phase composition, morphology and microstructure of the prepared powders as well as the copper base sintered composites were investigated using X-ray diffraction analysis (XRD) and Scanning Electron Microscope (SEM) equipped with an Energy Dispersive Spectrometer (EDS) respectively. The density of the sintered composites was measured by Archimedes method. The copper base consolidated composites had a density up to 96% and the reinforcement coated particles were distributed uniformly within the copper matrix better than the un-coated one. The electrical resistivity at room temperature and the heat transfer conduction of the produced samples were measured in a temperature range between 323 K (50˚C) and 393 K (120˚C). The results observed that the sintered materials prepared from the coated powder have lower electrical resistivity than the sintered materials prepared from the mixed powders. On the other hand the thermal conductivity values were calculated using the heat transfer conduction values by means of the Fourier formula. The results observed that the thermal conductivity of copper is (391 W/m • K), 1 wt% diamond/Cu is (408 W/m • K), 1 wt% graphite coated silver/Cu is (393 W/m • K), 1 wt% Cu coated short carbon fiber/Cu is (393 W/m • K), graphite/Cu is (383 W/m • K) and short carbon fiber/Cu is (382 W/m • K). The obtained composites W. Daoush et al. 543 are expected to be suitable for heat sink applications. The heat transfer testing experiments were done. The forced convection of the present work was done and compared with the previous work in the literature, and satisfactory agreement was achieved.
2000
The thermal conductivity and thermal diffusivity of oil-palm-fiber-reinforced untreated (Sample 1) and differently treated composites were measured with the transient plane source technique at room temperature and under normal pressure. All the composites were 40% oil-palm fiber by weight. The fibers were treated with alkali (Composite 2), silane (Composite 3), and acetic acid (Composite 4) and reinforced in a phenolformaldehyde matrix. The thermal conductivity and thermal diffusivity of the composites increased after treatment to different extents. The thermal conductivity of the treated fibers as well as of the untreated fibers was calculated theoretically. The model results show that the thermal conductivity of the untreated fiber was smaller than the thermal conductivity of the treated fibers.
Investigations on Thermal Conductivity of Palm Fibre Reinforced Polyester Composites
The palm fibre reinforced polyester composites (PFRP) have been prepared by using hand-lay-up technique. The thermal conductivity of the palm fibre reinforced polyester composites at different volume fractions of the fibre is determined experimentally by using Lee's apparatus. The principle of heat transfer by conduction through a bad conductor is equal to the quantity of heat transfer by radiation from metallic disc has been applied. The experimental results shows that the thermal conductivity of the composite increases with increase in fibre percentage. Experimental results are compared with rule of mixture model, parallel model and Maxwell model to describe the variation of the thermal conductivity versus the volume fraction of the fibre. All three models exhibited results close to each other at low fibre content. It has been found that the errors associated with rule of mixtures, parallel model and Maxwell's correlations with respect to experimental ones lie in the range of 33-79%, 28 to73% and 31 to 75% respectively.
Materials & Design (1980-2015), 2015
This paper presents an experimental study on the development of polymer bio-composites. The composites were fabricated from unsaturated isophethalic polyester resin containing powdered oil palm shell (OPS) as a function of powder particle size. The influence of washing OPS powder in methanol to remove surface impurities was also investigated with the tensile and flexural strengths and moduli improving significantly (between 22.9~61.4 %) for the composites containing washed OPS powder compared to the unwashed case. It was observed that the composite tensile and flexural strength generally increased with decreasing powder size with the strength of the composite containing 75~150 µm OPS powder being similar to that of the pure matrix. However, the tensile and flexural moduli of the composites were found to be essentially independent of powder size. Thermogravimetric analysis (TGA) in flowing oxygen indicated that the addition of OPS powder shifted the thermal degradation peak of the bio-composite from 370 ºC to 418 ºC.
Thermal and mechanical properties of copper powder filled poly (ethylene) composites
Powder Technology, 1997
The thermal conductivity and mechanical properties such as tensile strength, elongation at break, modulus of elasticity, and toughness of composites formed by copper powder filler embedded in a high density poly(ethylene ) matrix are investigated experimerltally and the resuhs compared with existing theories. Thenual conductivity measttremcnts are perfnrmed up to a filler concentration of I0 vol,%. A modified hotwire technique is used to measure the thermal conductivity. The conductivity is best predicted by the Lewis and Nielsen model which takes into account the shape of the particles as well as the type of packing. The mechanical properties of high density poly(ethylene) tilled with up to 18 vol,% Cu particles arc investigated. The tensile strength, elongation at break and toughness decreased with increasing copper content, attribute,] to the introduction of discontinuities in the structure. The modulus of elasticity increased with increasing copper content,
Advances in Materials Science and Engineering, 2016
The production of new thermally insulating composite materials from solid residues such as charcoal from sugarcane bagasse (CSB) is of great importance because it takes advantage of materials that might otherwise pollute the environment. Therefore, for this study, we obtained composite materials based on a portland cement (CPC-30R) matrix and CSB particles with a 4 : 1 water-cement ratio and CSB concentrations of 5%, 10%, and 15% by weight. The thermal conductivities of these materials were characterized following ASTM guideline C177, their CSB morphological properties were analyzed using scanning electron microscopy (SEM), and their compositions were determined using energy-dispersive spectrometer (EDS). The results show that the composite materials have reduced thermal conductivities. The metallic oxide percentage composition of the CSB was also determined. It was observed that there was a reduction in thermal conductivity when CSB was used as compared to 100% CPC-30R, and the inf...
Physical and thermal behaviour of areca and coconut shell powder reinforced epoxy composites
Materials Today: Proceedings, 2020
An understanding of the temperature dependent properties such as thermal conductivity, specific heat, and thermal diffusivity of natural fiber reinforced polymer composites are an important to determining their heat conduction/insulation capability. In the present study, epoxy based hybrid composites were fabricated by reinforcing the areca and coconut shell powder (CSP) to improve the thermal insulation. The two reinforcements were added together with different weight ratios as 1:1, 1:3, and 3:1 and the total fiber loading of 10-40 wt%. The effect of weight ratio and fiber loading on the density, water absorption, thermal conductivity, specific heat, and thermal diffusivity properties of areca-CSP reinforced epoxy composites was examined. The results revealed that the density, thermal conductivity, and specific heat of hybrid composites were decreased with increase in fiber loading. On other hand, it was observed that the water absorption of hybrid composite was increases with the fiber loading.
Determination of The Thermal Properties of Groundnut Shell Particles Reinforced Polymer Composite
2018
Natural fibers in recent times find useful application in both the manufacturing and construction sector. These fibers when reinforced with polymers form composites materials which possess excellent thermal properties suitable for thermal insulation. The composites can be well applied in the packaging, industrial and household thermal shield. The thermal properties of groundnut shell were successfully optimizedand characterized using Leeds Apparatus and calorimetry. The composite specimens were prepared with different weight percentages of randomly distributed groundnut shell particles in polymer matrix. Composites were prepared by varying the percentage of groundnut shell. We observed that the thermal conductivity of groundnut shell reinforced polymer composite (GSPC) decreased (0.355 – 0.221 W/mK) with increasing weight percentage (wt%)of the groundnut fiber (GF); while the thermal resistivity increases. Thermal diffusivity decreases with additional particles content.
Journal of Material Science & Engineering, 2016
Frequent use of various types of green composite in different applications has led to the great development in material science technology. Coconut shell which is generally considered waste material is been analysed here to get its desired properties and characteristics. Basically composite particles are studied using various macroscopic and microscopic approach and with various advance techniques like Scanning electron microscopy (SEM), Water absorption and Thickness swelling test, Thermal analysis, Thermo Gravimetric analysis (TGA) and Differential thermal analysis (DTA). In our work we have focused on the thermal analysis of coconut shell particles using TGA and DTA technology and finally the conclusion is made regarding the feasibility of using Coconut Shell Particle in Application of green composites.