The aims of this work are study the effects of adding nano zirconia ZrO2 particles (NZ) on the physical and some mechanical properties of cement paste like: porosity, dry density, water absorption and compressive strength, where different cement replacement weight percentages of NZ particles, 0%, 0.75%, 1.5%, 2.25%, and 3 % by weight of cement, had used in cement paste. Physical properties of the prepared specimens had been tested and evaluated after various curing times, 7, 14, 21, and 28 days, while compressive tests had been performed after 28 days. The results showed direct decreasing in porosity, water adsorption and increasing in density and compressive strength with increasing weight fractions of NZ. The maximum increasing in density and compressive strength were 13% and 21% respectively of that of plain cement paste, while porosity and water adsorption decreasing were about 43.5 % and 43.7 % respectively of that of plain cement paste, when using 2.25 wt. % NZ cement replacement, after curing for 28 days.
Although low mechanical properties of Acrylic resin, it is the most popular used substance as based denture materials. This drawback could be treated through adding reinforcing phase. In this work washing and non-washing banana peels as kind of natural fibers with different weight fractions, (5, 10, 15 and 20) % wt. and standared Acrylic, for compartion purpose, are used to prepare composite specimens by modeling method on order to study possibility of reinforcing cold-curing acrylic resin by banana peels. Peels had been dried, crashed, and washed by distillation water before using in the work. Unwashed peels also used for comparing purpose. Hardness, impact, and tendsile tests were performed to evaluate the development in mechanical properties of the prepared composite. Generally the results show that washed banana peels have more effective than that of un-washed peels, adding banana peels could improve hardness of composite and hardness increase with increasing weight fraction of peels till specific value, (10) % wt. where highest hardness recorded, using high weight fraction of reinforcing phase could negatively effect into mechanical properties of composite, Also the results show that using banana fibers as reinforce phase, didin’t improve impact strength, fracture toughness, and modules of elasticity properties of acrylic.
Through the last two to three dictate, composite materials had being applied enormously inmany industry fields. This is as fact that this type of materials possess; high strength toweight ratio, high stiffness, and limit thermal conductivity. In this work Nano-Yttrium oxidewith (0%, 1%, 2%, 3% and 4%) weight fraction had been added, as reinforcement phase, toacrylic resin (cold curing). Various physical and mechanical tests had done for determiningthe development in the properties of the prepared composite samples like: hardness, tensilestrength, thermal conductivity, water absorption and density. The results show: decreasingtensile strength with increasing Nano-Y2O3 weight fraction, maximum decline in tensilestrength was at (4) % Y2O3, about (16.2) % of Acrylic strength; increasing in hardness withincreasing Nano-Y2O3 weight fraction, maximum hardness was at (4) % Y2O3, about (107)% of Acrylic hardness, no obviously density change with increasing Nano-Y2O3 weightfraction, decreasing water adsorption with increasing Nano-Y2O3 weight fraction, maximumdecreasing in water absorption percentage was at (4) % of Y2O3, about (93) % of Acrylicwater absorption, decreasing thermal conductivity with increasing weight fractions of Nano-Y2O3, maximum decline in thermal conductivity was at (4)% of Y2O3 , about (90)% ofAcrylic thermal conductivity
This work focuses on the synthesis of hybrid polymer composite matrix materials prepared from the epoxy-Polyurethane resin (Polyprime EP) as matrix reinforced phase by using (5%, 10%, 15% and 20%) Zinc oxide particles and 5% woven roving Kevlar fiber (0 0 -90 0 ) kind ( 49). Mechanical and physical tests such as tensile strength, impact strength, hardness, density, thermal conductivity, and water absorption were done. The results showed increased hardness with increasing volume fraction of ZnO for the ratios (5%, 10%, 15% and 20%). The impact strength was increased for volume fraction of zinc oxide at 15%, modulus of elasticity at 5%, thermal conductivity at 20% and density test at 10%. The stress increased at volume fraction of zinc oxide at 10% and 15%. The water absorption decreased with increasing volume fraction of ZnO additives.
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