Purpose -The main goal of the present study is to investigate the friction and wear behaviors of aluminum matrix composites with an A360 matrix reinforced with SiC, B 4 C and SiC/B 4 C particles. Design/methodology/approach -Un-reinforced aluminum casting alloy, Al/SiC, Al/B 4 C and Al/SiC/B 4 C aluminum composites were prepared for the present study. Friction and wear tests of aluminum and its composites versus AISI316L stainless steel were carried out for dry sliding condition using by a pin-on-disc arrangement. Tests were realized at the sliding speed of 0.5, 1.0 and 1.5 ms 2 1 and under the loads of 10, 20 and 30 N. The microstructures of the present composites were examined by scanning electron microscopy and energy dispersive spectroscopy analysis. Findings -The coefficient of friction of the composites is approximately 25-30 percent lower than that of the un-reinforced aluminum. The specific wear rate of the aluminum and its composites decreases with the increase in load and increases with the increment of sliding speed. Un-reinforced aluminum has specific wear rate value of 1.73 £ 10 2 13 which is the highest specific wear rate, while Al þ 17%SiC has specific wear rate value of 2.25 £ 10 2 13 m 2 N 2 1 which is the lowest specific wear rate among the tested materials. The average specific wear rates for Al þ 17%B 4 C, Al þ 17%SiC/B 4 C and Al þ 17%SiC composites are obtained about 49, 79 and 160 percent lower than aluminum wear rate under the same test conditions, respectively. Originality/value -In the present study, composites were prepared by pressured infiltration technique. The employed composites are important in industry due to their higher wear resistance, light in weight and less thermal distortion comparing to conventional composites. Also, wear behavior of Al/B 4 C, Al/SiC/B 4 C and Al/SiC composites produced by pressured infiltration technique were not studied very much earlier, therefore more explanation about these composites were proposed.

In this study, the wear behaviors of aluminum matrix composites with an A360 matrix reinforced with silicon carbide (SiC) and boron carbide (B4C) ceramic particles using Taguchi method were investigated. Wear tests of unreinforced aluminum alloy and Al17%SiC and Al17%B4C particles reinforced aluminum composites (Al/17%SiC and Al/17%B4C, respectively) versus AISI316L stainless steel disc were carried out for a dry sliding condition in a so-called a pin-on-disc arrangement. The wear tests were realized at the sliding speeds of 0.5, 1.0, and 1.5 m s−1 and under the loads of 10, 20, and 30 N. The obtained average specific wear rates for Al/17%B4C and Al/17%SiC composites are lower than unreinforced aluminum specific wear rate under the same test conditions. The experimental results are transformed into a signal-to-noise ( S/ N) ratio of using Taguchi method. Type of the material, applied load, and sliding speed exert a great effect on the specific wear rate, at 48.13%, 31.83%, and 8.77%, respectively. The estimated S/ N ratio using the optimal testing parameters for specific wear rate were calculated and a good agreement was observed between the predicted and actual specific wear rate for a confidence level of 99.5%.

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Until now, recycling studies brought to the agenda after the rapid increasing of plastic materials in every area and causing those plastics to environmental pollution after discarding them following the utilization. The purpose of recycling plastic waste is to minimize environmental pollution and to create of new resources. To perform the present study, Recycled Polypropylene Granules (RPP) belonging to Polypropylene (PP) will be used in most particularly in the automotive and in the packaging industry finding application area behind the Low Density Polyethylene (LDPE). To develop the several properties (physical and thermal) of RPP polymer and to get close to or greater value to the original PP features, different rates of micron-sized glass fibers, talc and CaCO 3 are added into the polymer. By recycling waste, demand for natural resources (such as oil, which is plastic's raw materials) will decrease and rapid consumption of energy sources will be prevented while providing the protection of natural resources. Raw materials imports would be reduced due to the usage of recycled products. In this study, Recycled Polypropylene Granules (RPP) were obtained from companies and glass fiber/talc/CaCO 3 additive RPP granules in different ratios were produced with compounding extrusion process. These produced new composite pellets were produced in injection molding machine by means of designed mold to perform tensile and impact tests. In the thermal analysis, the melting temperature and crystallization rate were determined by DSC analysis; the thermal decomposition temperature was determined by TGA analysis. Micro structural examination was done using a Scanning Electron Microscope (SEM).

Production of a better material is made more likely by combining two or more materials with complementary properties. The best combination of strength and ductility may be accomplished in solids that consist of fibres embedded in a host material.Polyester is a suitable component for composite materials, as it adheres so readily to the particles, sheets, or fibres of the other components.The best known form of resin impregnated glass fibres is GRP (Glass Reinforced Polyester). The fibres may be woven together, pressed into a mat, or used as a random "wool".In this study, the structural properties of glass fibre reinforced polyester matrix composites were studied. Glass fibre content varied from 9 to 33% wt. in the composites; the other materials (polystyrene, zinc stereate, alkaline peroxide, magnesium oxide, pigment paste, calcite, etc.) were included to make up the percentages of polyester matrix. To investigate the structural properties, Charpy impact, tensile, bending and hardness tests were utilised. For microstructural study, optical and scanning electron microscope techniques were used. The results are tabulated depending upon the glass fibre rates.