The investigation was concentrated on preparation of bioactive pure cordierite ceramic and evaluate the phase transformation which excepted to form during sintering process. Cordierite prepare by chemical co precipitation, integrated Cordierite gel with water-based sol–gel which begin essentially from Alumina Al2O3, magnesium oxide MgO and silicon oxide SiO2. Different specimens were fabricated with various weight percentage of Al2O3, Mgo and SiO2 powders. All specimens were prepared in cylindrical shape by using hydraulic press at pressure of 4 bar with holding time at this pressure for 30 minutes. Firing presses achieve at 10000C and 12500C with 2 hour holding time. The characterization of microstructure has been done by using Field Emission Scanning Electron Microscope (FESEM), which revealed homogenous distribution of the compounds with few porosities. The x-ray diffraction for phase transformation which occur during sintering process. The structure analysis of specimens shows at 1250°C cordierite phase form, also the results are shown formation of cristobalite, spinel, protoestatite and corundum with cordierite phase.
Tribological characteristics (Wear and Friction) have been studied for (PMMA) polymer, reinforced by nano [TiO2 - ZnO] with volume fractions (0, 2, 3, 4 and 5) vol. %. Ultrasonic dispersion technique was used to prepare the nanocomposites specimens followed by cold – casting technique using flash Teflon molds according to standard conditions. [Pin-on-disc] technique is used to measure wear rate and coefficient of friction. Tribological results show that the values are decreased progressively by succession of load increasing as well as volume fractions of fillers. Scanning electron microscopy technique were employed to aid interpretation results of sliding wear and distribution nanoparticles in base – matrix.
In this study, the MgTiO3 ceramic system was used in a dry mixing method with 2: 1 mol and was reinforced to white acrylic powder used in dental applications to form a mixture of 1%, 2%, 3%, 4% and 5% of ceramic powder. The ultrasound technique was used to disperse the powder and distribute it homogeneously in the chloroform solution for one hour and then mixed it with acrylic powder in the same technique for half an hour. The tests were done for the samples made using industrial saliva with bacteria. Calculate the rate of wear using Pin on disc method. The results were interpreted based on the resulting images from the scanning electron microscope and the density of the prepared samples.
In the present study, composites have been prepared with basis polymers reinforced with triple system of bio-ceramic (CaO, TiO2, ZrO2). The percentages of the weight have been ( 0%,2%,4%,6%,8% ). The method of mixing the manual fluid and the ultrasound technique to distribute the powder pre-prepared within the polymer to obtain the desired mechanical properties has been suitable for this purpose. Mechanical tests have been performed to determine the efficiency of the composites performance, the Included (Impact strength, hardness and wear resistance). The results have shown a significant improvement in the values of the impact energy and the hardness of the particulate as well as the high resistance to wear the composites compared to the base material. The results have been interpreted according to synthetic tests for the powder (X-ray, SEM, EDX).
In this study, thermal analysis properties (Heat Transfer) have been studied for UPE-PMMA polymer blend reinforced with x-ZnO where x is (0wt%, 1wt%, 2wt%, 3wt%, 4wt% and 5wt %). Ultrasonic dispersion technique used to prepare the nanocomposites specimens follow with cold casting technique using Teflon molds at standard conditions. C - Thermosensor (TC i) technique was used to measure the heat transfer properties such as; (thermal conductivity, thermal effusivity, thermal diffusivity, heat capacity and thermal resistance). Results show that the values of conductivity, effusivity and diffusivity are increased by succession of weight percentage of fillers. While a heat capacity and thermal resistance results show that the values are decreased progressively by succession of weight percentage of fillers. Scanning electron microscopy was employed to aid interpretation results of thermal analyzer and to show the distribution of nanoparticles in polymer matrix.
The study concentration on the fabricate of bioactive behavior of pure cordierite system and investigate the structure of phase transformation and physical characteristics. cordierite powders were synthesized by chemical coprecipitation, combined Cordierite gel with water-based sol–gel which begin fundamental from magnesium oxide MgO, Alumina Al2O3 and silicon oxide SiO2. Five specimens were prepared with different weight percentage of Mgo, Al2O3 and SiO2 powders. cylindrical shape samples were press by hydraulic press at 4 bar for 30 minutes. All specimens were sintered at 1250 0C.The microstructure examination of specimens was carried out using Field Emission Scanning Electron Microscope (FESEM), x-ray diffraction (XRD) and particle size analysis The analysis revealed cordierite phase formation at 1250 °C, and the intense peaks were identified for composites S4 and S5. The results also indicated the formation of spinel, cristobalite, corundum, protoestatite and cordierite for all the specimens.
In this research, a metal alloy was prepared and its structural and physiological properties were studied. The method of powder technology was used in mixing and mixing powders. The ratio of 1: 1 was mixed with 100 micron granular powder and nickel powder with granular size of 78 microns. The mixture was then reinforced with a nanocrystalline powder with a mixing ratio of 0%, 1%, 3%, 5% and 7%), where the powders were mixed in an effective mechanical mixing method at a rate of 350 rpm and 6 hours continuously. Physical tests (density, hardness, yield strength, young modulus) were performed. The electrical tests were carried out using four sensors (probs) such as resistivity and electrical conductivity, as well as structural tests such as X-ray diffraction and scanning electron microscopy. The results showed a significant improvement in the micro hardness values using Vickers hardness, which resulted in improved yield strength and young modulus respectively. The results of the test showed that the electrical conductivity properties showed a clear reduction in the resistivity values of the alloys supported by the nano-silver powder and an increase in the values of the electrical conductivity compared to the base alloy (nickel-titanium).
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