This work analyzes the mechanical behavior of new composite materials with polymeric matrix, made from recycled polyethylene terephthalate (r-PET), reinforced with 10, 20, 30 and 40 wt% Zn metal particles, processed under isothermal sintering at constant temperature (256°C) and time (15 min) conditions. The r-PET/Zn composite material samples were obtained by a powder traditional technique, namely, ball-milling, uniaxial dye-pressing to obtain pre-forms followed by isothermal sintering. The observations through optical microscopy of the overall morphologies that resulted after sintering the samples studied, were compared against the r-PET-control sample without reinforcement, processed under the same conditions. From the results, it was found that the metal particles were distributed uniformly in the matrix; further, increasing amounts of metal particles tended to improve the mechanical behavior resulting in a stronger material, as was the case of the two materials with higher metal contents (30 and 40 wt% Zn).
In this work we studied the response to degradation of Al2O3/Al2TiO5 composites in a Hanks’ solution, which simulates human synovial fluid in contact with bone tissues. Electrochemical impedance study determined that the resistance to polarization of composite rises with increases in the amount of Al2TiO5 and with the sintering time.
Thepresent research analyzes the effect induced through addition of two zinc concentrations to composites based on recycled PET (polyethylene terephthalate), as a polymer matrix. Prior to mechanical assessment, the optimum grinding time was determined, namely, where the smaller particle size was generated (PET–420mm and Zn-5mm), that was 3 h. Subsequently, a comparison was done between two different blends, changing the zinc concentration 10 or 30 wt. %, from which the necessary test specimens for isothermal sintering were prepared and exposed at 256°C for 10, 15 and 20 minutes periods. These preliminary specimens permitted to value, for each zinc concentration, theirdensity, hardness (shore D) and water absorption. The best results were obtained with the samples sintered for the intermediate periods. The flexion and compression toughness were evaluated, where the blend with the higher toughness contained 30 wt. % Zn.
Alumina-based composites reinforced with titanium were manufactured by powder techniques. Characterizations indicate that titanium content affects densification which in turn causes positive effects on hardness and toughness. Microstructure presents grains of irregular shape and small sizes. Electrochemical impedance spectroscopy indicates that additions of titanium on Al2O3 enhance its corrosion resistance.
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