The aim of this research is to measure the hardness and wear rate for epoxy resin as a base material, nano ceramic powder (SiC) with particle size ( 64.85nm ), were used as a reinforcement materials in composites preparation in different weight fractures (2%, 4%, 6%), hand-casting method was used in preparation the research samples, Mechanical properties were measured after irradiation of gamma rays emitted from the CO60 with energy rate of 1.33MeV and different irradiation doses (6,8,10) KGy. The results showed an increase in the hardness values after the irradiation compared with the results before irradiation while wear test showed a decrease in the values in normal conditions compare with the result after irradiation.
The rubber was reinforced with nanoparticle powder (N Pb) to prepare shields in hospital X-ray units for the purpose of protecting women and workers in X-rays. The addition of chlorophyll extracted from tree leaves and plants as a plasticizer and anti-oxidant with different ratios of (20 -100) pphr . (20 pphr) was chosen as a ratio that achieves the purpose, but prevented it from penetrating the X-ray radiation is very little even at a high ratio, as well as TiO2 was added with different ratio (20 -100) pphr. 20 pphr was chosen as a ratio that achieves the purpose and obtaining good mechanical properties such as tensile strength, elasticity and hardness, but it prevents it from penetrating the X-ray was very few even at high ratios. Then adding nanoparticles lead(N Pb) with different ratio (40 -350) pphr. Good results in cutting the radiation penetrate the X-ray and the best ratios (100, 200, 300, 350) pphr. As adding (100 pphr) of N Pb to the rubber with a thickness (2 mm) the X-ray were penetrated and cut at (60 KV). Whereas, adding (200 pphr) of N Pb to the rubber with a thickness of (2 mm) prevented the penetration of X-Ray rays and cut them at (80 KV). Whereas, adding (300 pphr) of N Pb to the rubber with a thickness of (3 mm) prevented the penetration of X-ray and cut them at (100KV). Whereas, adding (350 pphr) of N Pb to the rubber with a thickness of (3 mm) prevented the penetration of X-ray and cut them at (110KV). In this way, the purpose of protecting women and their workers from X-ray radiation when using a shield with a thickness of (3 mm) was achieved.
In the recent years, modern materials have been needed that will have a lasting impact in modern applications. The need for radiation therapy as an important means of modifying nanoscale structures in the manufacture of high performance polymer compounds has important advantages. The aim of this research is to measure the thermal conductivity for epoxy resin as a base material, Nano ceramic powder (SiC) with particle size (64.85nm), and nano Graphite powder with particle size (87.85 nm) are used as a reinforcement materials in composites preparating in different weight fractures (2%, 4%, 6%), while the Hybrid (SiC-Graphit) model are prepared by another weight fractures of (SiC and Graphite), Hand-casting method was used in preparation the research samples. The thermal conductivity tests were measured for all weight fractures in normal conditions (before irradiation). we find the values of thermal conductivity is increased with the increase of weight fractures because of the presence of the reinforcement material, including high thermal conductivity graphite compared to silicon. Tests of the thermal conductivity are measured after irradiation of Gamma rays emitted from the CO60 with energy rate of 1.33MeV and different irradiation doses (6,8,10)KGy. The results show an increase in the thermal conductivity values after the irradiation compared with the results of thermal conductivity in normal conditions. It is worth noting that an atomic force microscope (AFM) has been used to measure the particle size of nanomaterials.
The natural rubber (SMR 30) was reinforced with micro particle powder TiO 2 with different ratio of (20 -100) pphr also study the effect of TiO 2 on mechanical properties in different ratio. The tensile, modulus and hardness was increasing while elongation was decreasing. X-Ray penetration resistance for the sample of rubber composite with TiO 2 at (100) pphr was week at 20 KV so the TiO 2 was giving the composite rubber white color.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.