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Composites and Compounds - Volume:2 Issue: 4, Sep 2020

Journal of Composites and Compounds
Volume:2 Issue: 4, Sep 2020

  • تاریخ انتشار: 1399/08/03
  • تعداد عناوین: 7
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  • Ameneh Bakhtiari, Amir Cheshmi, Maryam Naeimi, Sobhan Mohammadi Fathabad, Maryam Aliasghari, Amir Modarresi Chahardehi*, Sahar Hassani, Vahideh Elhami Pages 110-114

    in this research, the 80S bioactive glass with different Ca/P ratios was prepared by the sol-gel route. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and Fourier transforms infrared spectroscopy (FTIR) were used to study the apatite structure and shape. According to the results, the 78SiO2–17P2O5–5CaO bioglass showed a higher rate of crys-talline hydroxyapatite (HA) on its surface in comparison with the other bioglasses. After 3 days of immersion in the SBF solution, spherical apatite was formed on the 78SiO2–17P2O5–5CaO surface, which demonstrated high bioactivity. A statistically significant promotion in proliferation and differentiation of G292 osteoblastic cells was also observed. Regarding its optimal cell viability and bioactivity, the 78SiO2–17P2O5–5CaO bioactive glass could be offered as a promising candidate for bone tissue applications.

    Keywords: Bioactive glass, 80SCa, P ratio, Hydroxyapatite
  • Mahsa Amiri, Saman Padervand, Vahid Tavakoli Targhi, Seyed Mohammad Mousavi khoei Pages 115-122

    One of the most important coating methods on aluminum surfaces is the electrolytic plasma method. The main ob-jective of the present study is to investigate the potential of aluminum oxide coatings created by electrolytic plas-ma method. Aluminum series 2 and the electrolyte of sodium silicate, sodium tetraphosphate, sodium aluminate, and potassium hydroxide were used. The results showed that the appropriate voltage to achieve uniform coating with ideal thickness and morphology is 500 V. Adding sodium silicate to the electrolyte solution will create poros-ity and non-adhesion to the substrate. On the other hand, the use of tetra sodium pyrophosphate increases the ad-hesion of the coating by penetrating phosphorus into the metal/coating interface. The optimum solution for plasma electrolytic oxidation coatings composed of 10, 3, and 3 g/l of tetra sodium pyrophosphate, sodium aluminate, and KOH, respectively. DC pulsed coating was shown to control the coating process and coating uniformity. Also the appropriate frequency to apply coating was DC pulse potential at 1000 Hz frequency under the 30% duty cycle.©2020 jourcc. All rights reserved.

    Keywords: Electrolyte plasma method, Aluminum oxide coatings, Potential applied regime
  • Morteza Ferdosi Heragha, Sara Eskandarinezhad*, Alireza Dehghan Pages 123-128

    St37 steel has been used in various industries due to its abundance and low cost. However, the high corrosion rate of steel in acidic environments is one of the limiting factors for its application. In this study, Ni-Cu compos-ite coating reinforced with CNTs was applied on the st37 steel substrate. The extract of the Sarang Semut plant was added to the coating as inhibitory particles and the electrochemical behavior of the coating was investigated. The X-ray diffraction test was performed for phase analysis. Hardness, wear, and dynamic potential polarization tests were performed. Results showed that the presence of CNT particles improved the hardness, tribological performance, and electrochemical behavior of the coating. Also, the presence of Sarang Semut particles acted as a barrier and protected the surface of st37 steel from corrosion. It should be noted that these particles affected the kinetics and thermodynamics of corrosion reactions and were not involved in the reactions.©2020 jourcc. All rights reserved.

    Keywords: St37, Corrosion resistance, CNTs, Ni-Cu composite coating
  • Mahsa Amiri, Vahid Tavakoli Targhi, Saman Padervand, Seyed Mohammad Mousavi khoei Pages 129-137

    The electrolytic plasma coating is affected by various factors such as electrolyte conductivity, voltage, and current. However, there has not been much attention to the effect of the current regime. The main objective of the present study is to investigate the potential of Al2O3 coatings deposited by the electrolytic plasma method. Aluminum Se-ries 2 was used in this study and the electrolyte was composed of sodium silicate, sodium tetraphosphate, sodium aluminate and potassium hydroxide. The results showed that, in general, according to the impedance diagrams, the corrosion resistance of the coated specimens greatly increases with the immersion time. Therefore, the unit of resistance increased on average to about 10 MHz after 72 hours. In the case of pulsed potential application regime, the corrosion behavior of the samples in the working cycle of 30% was better than that of 70%, which can be related to the thickness of the formed coatings and their porosity. This allows the coating to degrade the coating faster by increasing the thickness and decreasing the porosity of the aggressive chloride ion.©2020 jourcc. All rights reserved.

    Keywords: Plasma electrolytic oxidation, Aluminum oxide coatings, Potential regime, Corrosion
  • Leyla Saei Fard*, Naeimeh Sadat Peighambardoust, Ho Won Jang, Alireza Dehghand, Niloufar Nehzat Khosh Salighehe, Marjan Iranpour, Mitra Isvand Rajabi Pages 138-146

    Digital cameras, laptop computers, cellular phones, as well as many portable electronic devices require batter-ies for powering. Based on the electrolyte type, electrolytic batteries can be categorized into solid-based, liq-uid-based, and ionic-based batteries. Aluminum ion batteries (AIBs) have some promising properties such as low cost, high safety, and high specific volumetric capacity. Nevertheless, in order for AIBs to be extensively used, developing novel electrode materials possessing high energy density is required. This is mainly dependent on the cathode materials. However, these cathode materials have some drawbacks such as structural decomposition, low battery capacity, low discharge voltage, and volume expansion resulting from the intercalation of large-sized ions. Therefore, future research might concentrate on the investigation of cheaper electrolyte and novel cathode materials for enhancement of energy density and working voltage. This review focuses on the recently developed cathodes, particularly, composite cathode materials, including graphite, CuS, V2O5, Li3VO4@C, VS4/rGO, and Ni3S2/graphene.

    Keywords: Liquid electrolyte, Solid electrolyte, Ionic electrolyte, Aluminum-ion battery, Composite cathodes
  • Aliasghar Abuchenari, Hadi Ghazanfari*, Mostafa Siavashi, Maryam Sabetzadeh, Sajad Talebi, Zahra Karami Chemeh, Ata Jamavari Pages 147-154

    To improve the hot section metallic parts durability in advanced gas-turbine operating in power generation and aircraft, thermal barrier coating (TBCs) are extensively utilized to increase their lifetime. The reason for applying coatings on these components is the improvement of their physical properties, mechanical properties, and outer look. The self-repairing ability of materials is very promising due to expanding the service time of materials and it is also beneficial in terms of human safety and financial aspects. In this review article, structure, properties, limitations, and the modification approaches of TBCs were studied. In addition, self-healing agents for TBCs including SiC, MoSi2, TiC were introduced, which release their oxide by reaction with air and O2 that are able to heal the pores/cracks in the coatings. In this regard, their coating methods, mechanism, and applications in TBCs were reviewed.

    Keywords: Thermal barrier coating (TBC), TBC lifetime, TBC modification, Self-healing composite
  • Milad Bazli*, Leila Bazli, Roozbeh Rahmani, Sohail Mansoord, Mohammad Ahmadi, Rasul Pouriamanesh Pages 155-162

    In recent years, fiber-reinforced polymer-polyvinyl chloride (FRP-PVC) tubular columns have been used increas-ingly in civil engineering applications. Concrete-filled RP-PVC tubes possess high durability, high strengthening performance, satisfactory bond strength, and compressive behavior. It has been observed that these cost-effec-tive tubular columns are promising materials for enhancing strain capacities, strength, and stiffness of structures containing reinforced concrete (RC). These composite tubular columns are composed of FRP and PVC and are used for strengthening concrete. FRP enhances strength capacity while PVC improves the corrosion resistance of concrete piles in harsh environments. This review focuses on the properties of FRP-PVC tubular columns, their application in civil engineering, and the recent advancements in this field.©2020 jourcc. All rights reserved.

    Keywords: Reinforced concrete, FRP–PVC, Tubular columns, Strengthening, Durability