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Publisher: Horizon Research Publishing   (Total: 54 journals)   [Sort by number of followers]

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Environment and Ecology Research     Open Access   (Followers: 8)
Food Science and Technology     Open Access   (Followers: 3)
Immunology and Infectious Diseases     Open Access   (Followers: 9)
Intl. J. of Biochemistry and Biophysics     Open Access   (Followers: 1)
Intl. J. of Cardiovascular and Cerebrovascular Disease     Open Access   (Followers: 2)
Intl. J. of Neuroscience and Behavioral Science     Open Access   (Followers: 1)
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Nanoscience and Nanoengineering     Open Access   (Followers: 1)
Natural Resources and Conservation     Open Access   (Followers: 6)
Nursing and Health     Open Access   (Followers: 4)
Open J. of Dentistry and Oral Medicine     Open Access   (Followers: 1)
Sociology and Anthropology     Open Access   (Followers: 5)
Sport and Art     Open Access   (Followers: 1)
Universal J. of Accounting and Finance     Open Access   (Followers: 4)
Universal J. of Agricultural Research     Open Access   (Followers: 1)
Universal J. of Applied Mathematics     Open Access   (Followers: 5)
Universal J. of Applied Science     Open Access   (Followers: 2)
Universal J. of Biomedical Engineering     Open Access  
Universal J. of Chemistry     Open Access   (Followers: 1)
Universal J. of Clinical Medicine     Open Access  
Universal J. of Communications and Network     Open Access   (Followers: 1)
Universal J. of Computational Mathematics     Open Access   (Followers: 5)
Universal J. of Control and Automation     Open Access   (Followers: 4)
Universal J. of Educational Research     Open Access   (Followers: 1)
Universal J. of Electrical and Electronic Engineering     Open Access   (Followers: 6)
Universal J. of Engineering Science     Open Access   (Followers: 2)
Universal J. of Food and Nutrition Science     Open Access   (Followers: 6)
Universal J. of Geoscience     Open Access   (Followers: 4)
Universal J. of Industrial and Business Management     Open Access   (Followers: 1)
Universal J. of Management     Open Access   (Followers: 2)
Universal J. of Materials Science     Open Access   (Followers: 3)
Universal J. of Mechanical Engineering     Open Access   (Followers: 16)
Universal J. of Medical Science     Open Access  
Universal J. of Microbiology Research     Open Access  
Universal J. of Physics and Application     Open Access   (Followers: 2)
Universal J. of Plant Science     Open Access  
Universal J. of Psychology     Open Access   (Followers: 3)
Universal J. of Public Health     Open Access   (Followers: 2)
World J. of Computer Application and Technology     Open Access   (Followers: 4)
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Universal Journal of Materials Science
Number of Followers: 3  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2331-6691 - ISSN (Online) 2331-6705
Published by Horizon Research Publishing Homepage  [54 journals]
  • The Effect of Accelerated Cooling on Microstructure and Impact Strength of
           S355J2 Quality Steels Used in Power Transmission Line Construction

    • Abstract: Publication date:  Jan 2019
      Source:Universal Journal of Materials Science  Volume  7  Number  1  Huseyin Zengin   Hayrettin Ahlatci   Serafettin Oner   Mustafa Emre Demirkazik   Sait Ozcelik   Yunus Turen   and Yavuz Sun   Heat treatment is the most commonly used production step which can change the overall mechanical properties of the material without changing the chemical composition. Among the heat treatment methods, accelerated cooling has been regarded as one of the most important method for obtaining good mechanical properties. Today, this method is used in the manufacture of thin pearlitic steel, double phase steel, bainitic steel in the production process of many different quality and size products from construction bar to profile. In the scope of this study, investigations were carried out on S355J2 equal angles section profiles produced by hot rolling method. It was observed that intensive inclusions were found in all of the materials and the mechanical strength could not be met at low rolling ratios. Particularly, these materials with low impact resistance have been subjected to accelerated cooling process in order to increase their impact strength. As a result of the accelerated cooling process, significant increases in impact strength have been observed, particularly with the change of microstructure.
      PubDate: Jan 2019
  • Degradation Study of LLDPE-starch-clay Composite Film Using Xenon Arc and
           Characterized on Mechanical and Chemical Properties

    • Abstract: Publication date:  Nov 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  5  Jayatin   Chandra Liza   and Syuhada   Starch blending with linear low-density polyethylene (LLDPE) is one of the plastic packaging materials alternative used for solving the plastic waste problem that difficult to degrade. Polymeric materials will change when exposed to weather that releases heat, chemistry, and light. It can be a trigger factor in the degradation process. Xenon Arc accelerated weather simulation test is one way to find out the resistance of plastic materials to weather. This study aimed to explain the effect of xenon arc light on LLDPE-starch-clay composite. In this work accelerated photodegradation tests using Xenon Arc ATLAS Ci 3000+ were carried out on LLDPE-starch-clay composite sample films. Clay, compatibilizers, and starch with a starch content of 10 wt% and 20 wt% were used to make composites masterbatch. The composite masterbatch then extruded with LLDPE and was prepared to make a film sample using Rheomex Haake Blown film. Mechanical properties of the film samples before and after xenon arc accelerated photodegradation treatment were tested using Universal Testing Machine (UTM) Shimadzu AGS-10kNG. The composite sample made from ten wt% starch showed 55% reduction in tensile strength after 14 days of degradation while sample prepared with 20 wt% starches was brittle after seven days of exposure to xenon arc light. Fourier Transform Infra-Red (FTIR) spectrophotometer test result for composite samples made from 10 wt% and 20 wt% starch after exposure to xenon arc light show increasing the intensity at the wave number of 1722 cm-1 that corresponding to carbonyl bond this proved that degradation has occurred.
      PubDate: Nov 2018
  • The Effect of Milling Time on the Mechanical Properties of ZA27/Al2O3

    • Abstract: Publication date:  Nov 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  5  Muslim Çelebi   Aykut Çanakçi   Serdar Özkaya   and A. Hasan Karabacak   In this study, ZA27/Al2O3 nanocomposites reinforced with 1 vol.% Al2O3 nanoparticles were produced using mechanical milling and hot pressing method. The milling time was changed between 1h to 8h. The hot pressing prose was performed in vacuum at 432℃ and pressure of 600 MPa. The effect of milling time on the density, hardness and tensile strength of the ZA27/Al2O3 nanocomposites were investigated. The results show that the increase in milling time resulted as a decrease in the density of nanocomposite due to the change in hardness of that. It was observed that the tensile strength of the nanocomposites reached their maximum value (163 MPa) at milling time of 2h and then decreased linearly with increasing milling time. Moreover, the hardness of the nanocomposite milled for 8h was obtained as 155 HB which is about 9 % higher than the hardness of nanocomposite milled for 1h. A linearly increase was also observed the hardness of nanocomposites.
      PubDate: Nov 2018
  • Dielectric Properties of
           Bi4(Ti,Nb,Mn)3O12 Titanates

    • Abstract: Publication date:  Nov 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  5  Andrei Klyndyuk   and Ekaterina Chizhova   The (x = 0.05, 0.10, 0.15) solid solutions have been synthesized by means of solid state reactions method, their crystal structure, microstructure, electrical and dielectric properties within wide interval of temperatures and frequencies have been investigated. It is found that the titanates crystallize in an orthorhombic structure and are p-type semiconductors, which sinterability and dielectric constant increase, but grain size and thermo-EMF coefficients decrease at partial substitution of titanium by niobium and manganese. It is established that ceramics is electrically homogeneous and relaxation processes in it are non-Debye-like, and values of activation energy of relaxation obtained from results of impedance and modulus spectroscopy are in a good agreement.
      PubDate: Nov 2018
  • Ag/AgCl Film Electrodes Coated with Agarose Gel as Planar Reference
           Electrodes for Potentiometric Sensors

    • Abstract: Publication date:  Nov 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  5  Tung Son Vinh Nguyen   Tien Minh Huynh   Thien Dien To   Tin Chanh Duc Doan   and Chien Mau Dang   Silver/silver chloride (Ag/AgCl) is commonly used as a reference electrode in electrochemical measurements. However, commercial macroscopic Ag/AgCl electrodes cannot be used in micro-electrochemical sensors. Thus, many scientists are trying to miniaturize reference electrodes to integrate into one sensor chip. In this paper a new approach for fabrication of Ag/AgCl thin films coated with agarose gel as planar reference electrodes for potentiometric sensors is introduced. A silver thin film of 220-250 nm was sputtered and patterned on silicon dioxide/ silicon substrates by lithography and lift-off techniques. A AgCl layer was coated on the Ag film by using a Ag[NH3]2Cl complex at 80℃ in vacuum. The thickness of the AgCl layers was about 5um. The Ag/AgCl layers were then coated with an agarose gel. The AgCl layers were characterized by X-ray diffraction, micro Raman spectroscopy and scanning electron microscopy. The Open Circuit Potential (OCP) measurements with the fabricated electrodes as reference electrodes in pH 7 buffer solutions were performed in comparison with a commercial Ag/AgCl electrode. The potential difference between the fabricated Ag/AgCl electrodes and the commercial Ag/AgCl electrode was insignificant. The coating of the agarose layer as a protection layer of the Ag/AgCl electrodes enhanced the durability of the modified electrodes. The results indicated that the fabricated Ag/AgCl thin films coated with the agarose gel could be used as planar reference electrodes for potentiometric sensors.
      PubDate: Nov 2018
  • The Effect of Carbon Sources on the Thermal Shock Properties of MgO-C

    • Abstract: Publication date:  Nov 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  5  Tuba Bahtli   Veysel Murat Bostanci   Derya Yesim Hopa   and Serife Yalcin Yasti   Thermal shock resistance of MgO-C refractories, which were used in the iron and steel industry, by incorporation of pyrolytic carbon black obtained by waste tire pyrolysis was investigated. The effect of porosity on the thermal shock resistance of those refractories as a function of carbon source (graphite or pyrolytic carbon black) was also examined in the current study. The microstructure and fracture surfaces were characterized using the Scanning Electron Microscopy (SEM). Experimental studies showed that refractories produced by the use of pyrolytic carbon black had higher amount of porosity and lower thermal shock resistance than refractories containing flake graphite.
      PubDate: Nov 2018
  • Investigation about Influence of Product Methods and Different Cores on
           Buckling and Post Buckling Behaviors of Sandwich Panels

    • Abstract: Publication date:  May 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  3  Sam Barati Nardin   Javad Rabiee Ezbarami   and Reza Fazeli   Despite of laminate or sandwich composite materials structure, mechanical behavior can estimate by methods or analytical relations like laminates classical theory according factors just like mechanical properties, fiber percentage, and product methods and etc. but generally these estimates are far from experimental results. This paper investigates about influence of product methods and different cores on buckling and post buckling behaviors of sandwich panels. Each panel was built by to quit different product method, hand layup or vacuum bag infusion procedure with different core. To build the panels an effort had made to choice materials which have usage in marine industry, special for high speed boats. Sandwich panels have 150×450 mm2 dimensions and one simply support and one clamed support. After tests, numerical models results which drive from finite element software are compared with experimental data. The results represent that combined model is suitable for simulate buckling and post buckling behavior. After chosen the software model, different parameters were evaluated whom the link element has the most efficacy on numerical results.
      PubDate: May 2018
  • Methods of Accelerated Tests of Advanced Multilayer Metallic Materials
           with Internal Protector

    • Abstract: Publication date:  May 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  3  Vladimir A. Grachev   Andrey E. Rozen   Yuri P. Perelygin   Sergey Yu. Kireev   and Irina S. Los   The paper estimates corrosion resistance of new multilayer metal materials with internal protector, in which the principle of tread pitting-protection is implemented. Experimentally, using the electron-microscopic method, the mechanism of corrosion destruction of layers is substantiated. The electrochemical and chemical methods of accelerated tests are proposed, which make it possible to determine the rate of corrosion destruction. The electrochemical method allows revealing the limiting stage of the process, calculating the mass index of corrosion and justifying the choice of the tread for this corrosive environment. The chemical test method makes it possible to quantify the effectiveness of the action of the inner tread and determine the relative index of corrosion resistance of the multilayer material compared with the monometallic material.
      PubDate: May 2018
  • Effect of Graphene Content on Tensile Strength and Microstructure of
           Aluminum Matrix Composites

    • Abstract: Publication date:  May 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  3  Mahmut Can Şenel   Mevlüt Gürbüz   and Erdem Koç   In this study, graphene nanoplatelets (GNPs) reinforced aluminum (Al) composites with various GNPs content (0.1, 0.3, 0.5wt.%) were fabricated by powder metallurgy (PM) method. In this method, ultrasonication, mixing, filtering, drying, compacting and sintering processes were performed. The crystal structure and microstructure of powders and fabricated composites were analyzed with X-Ray diffractometer (XRD) and scanning electron microscopy (SEM). With this study, the effects of GNPs content were investigated on the density, Vickers hardness, ultimate tensile strength, and microstructure of Al-GNPs composites. The Vickers hardness (57±2.5 HV) and ultimate tensile strength (120MPa) of Al-0.1%GNPs improved up to +90% and +23.3% when compared with pure aluminum (30±2 HV, 92MPa). From the microstructural analysis, homogeneously distributed GNPs was located at aluminum grain boundaries. The mechanical properties of Al-GNPs composite decreased due to the agglomeration of GNPs above 0.1wt.% GNPs content.
      PubDate: May 2018
  • Nonlinear Loading Effects in Oxide-filled Polyester Nanocomposites
           Observed by IR-spectroscopy and Lifetime Positron Spectroscopy

    • Abstract: Publication date:  Mar 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  2  Borys M.Gorelov   Oleksiy I. Polovina   Alla M. Gorb   Marek Kostrzewa   and Adam Ingram   Impact of nanosized oxide particles of titania (rutile) (TiO2) and silica-titania fumed compound on physical properties related to inner structure of a styrene-cross-linked polyester resin have been experimentally studied. The IR-spectroscopy and the positron annihilation lifetime spectroscopy (PAL) were used to study the electronic polarizability of interatomic bonds and the positron annihilation processes with increasing the filler loading. All the nanocomposites show unmonotonous variations in the IR-absorption lines and the positron annihilation parameters. Three lifetime components, namely τ1, τ2, and τ3 with intensities I1, I2, and I3 have been determined. The lifetime loading dependences exhibit non-monotonous lowering within the low loading range (Cm ≤ 5%) with the minima values at Cm ~ 1.5 % for the unfilled resin and the nanocomposites. The free-volume portion fv (in %) in a polymer matrix decreases droningly for the nanocomposites with STO-particles upon loading while for the TiO2-nanocomposites it increases non-monotonously. The parameters describing the supramolecular structure of the nanocomposites have been calculated using the fractal approach. Some correlations between loading-dependent PAL-properties and underlying alterations in the resin's supramolecular structure have been discussed.
      PubDate: Mar 2018
  • Design and Analysis of Scissor Lifting System by Using Finite Elements

    • Abstract: Publication date:  Mar 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  2  Cengiz Görkem Dengiz   Mahmut Can Şenel   Kemal Yıldızlı   and Erdem Koç   Scissor-type systems are frequently used as lifting systems in the industry. These systems are mainly preferred to do maintenance, repair, and clean. In this study, the design and analysis of a scissor lift system were performed with having a load carrying capacity of 500kg and a working height of 2m. The solid model and assembly of the system have been developed by the SolidWorks program. The structural analysis of the system was also investigated with the help of the same program i.e. stress, deflection, and safety factor values of system elements were obtained. As a result of the analyses, it was concluded that the system designed could safely be used during load/unload operations.
      PubDate: Mar 2018
  • Augmentation of Thermal Conductivity for Polypropylene / Ethylene-vinyl
           Acetate Based Composites Filled by Organic and Inorganic Particles

    • Abstract: Publication date:  Mar 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  2  Rashed Al Mizan   and Md. Aminul Islam   Emerging thermal dissipation of many electronic devices, i.e. light emitting diodes, energy storage components, CPU chips etc. as well as in many emergent new applications (smart textile, self-assembling materials, etc.) is a great challenge. The reliance of thermal conductivity of composites on the filler loading, filler networking morphology and on the whole composite structure is also discussed. This work is intended to design composites for the improvement of thermal conductivity of polypropylene and ethylene-vinyl acetate copolymer with lower filler contents. As filler both organic (activated carbon) and inorganic (alumina) materials alone or in a combination of various relative proportions have been used. An internal blending unit was used for melting the copolymer and proper mixing the filler particles with the molten matrix. Final composites were made by the hot press. Then Lee's Disc apparatus was used to measure the thermal conductivity of various composite samples by steady-state method. Experimental results show that only carbon black addition was not adequate to increase the thermal conductivity of the composites to expected level. The experimental value compare with some theoretical model to describe the prediction value accuracy for such multiphase composite. However, addition of small amount of alumina powder with carbon black significantly increased the copolymer composites.
      PubDate: Mar 2018
  • Effect of Cooling Cycle after Sintering on the Thermal Diffusivity of Y2O3
           Doped Si3N4 Ceramics

    • Abstract: Publication date:  Jan 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  1  Pınar Uyan   and Servet Turan   As a result of the studies that have been made for increasing the thermal conductivity of Si3N4, increasing thermal conductivity values have paved the way for the technologic applications such as using the Si3N4 in electronic devices as heatsink and substrate. Two important parameters such as density and grain boundary phase that affect the thermal conductivity of the Si3N4 ceramics are based on the sintering additives and techniques. Exposure time to gas applied in the sintering and cooling cycle after sintering are the critical factors that affect the intergranular phase crystallization. In this study, the effect of Y2O3 doped Si3N4 ceramics and different cooling cycle after gas-pressure sintering to the phase crystallization and thermal diffusivity was researched. The samples were subjected to two different cooling cycles after sintering. The thermal diffusivity value of the sample applied by slow cooling cycle is 17.79 mm2/sec, the sample applied by rapid cooling cycle is 16.2 mm2/sec. As a result of slow cooling cycle, the crystallization has increased but thermal diffusivity has decreased at the rate of ~ 8.94%.
      PubDate: Jan 2018
  • Effect of Aging Heat Treatment on the Mechanical Properties of SiC

    • Abstract: Publication date:  Jan 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  1  Pınar Uyan   and Remzi Gürler   Nowadays, light part production by the strategies of performance improving known as 'Engine Downsizing' by decreasing the engine size is popular. Al-Zn-Mg alloyed composites reinforced by SiC particle are mostly produced by powder metallurgy. In fact, Liquid mixing casting technique alternatively developed against the powder metallurgy has more than advantageous when taking into the consideration of its production capacity, production cost and part production similar to the definitive form. In this study, the hardness variation of SiC particle reinforced composites manufactured by the method of affordable 'Vortex Casting' and in different amounts by weight and 7075 alloy after aging process in different times at 140℃ and 230℃ was reviewed and their microstructure analyses were made accordingly. After 16 hours aging of 7075 alloy and the composites reinforced by 5% SiC at 140℃ and 12 hours aging in the composites reinforced by 3% SiC, at 230℃, after 9 hours aging in all materials, the maximum hardness value was measured. In higher aging temperature, due to the fact that max hardness was achieved in shorter period, in lower aging temperature, higher hardness was achieved.
      PubDate: Jan 2018
  • Investigation of the Hygrothermal Effect on the Nanocomposite Material
           under High Strain Rate Torsion

    • Abstract: Publication date:  Jan 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  1  Fadhel Abbas Abdullah   and Zahra khalid Hamdan   This study aims to explain the effect of high strain rate torsion on unidirectional fiber glass / epoxy composite with and without adding nano particles (carbon and alumina) with weight percentage 2% and study the effect of the temperature and humidity on the samples under torsion dynamic test. Using the torsional Hopkinson split bar to testing under angle of the twist θ=10°. It can noticed that the maximum of the shear (stress, strain) of the composite increased with adding nano particles by rate of (24.8%, 3.2%) with added 2% nano carbon and (26%, 8.5%) with added 2% nano alumina, where the shear stress, shear strain and shear strain rate of all samples decreased with increasing (temperature and humidity) with different percentages. Finally, it was modifying Johnson-Cook constitutive model by adding parameter represented the humidity effect to simulate the experimental results, and then it was found the error percentages between the experimental results and theoretical results which range (0.0044% and 15.5%).
      PubDate: Jan 2018
  • Measurement of High Values of Q-factor of 1.3 GHz Superconducting Cavity
           of TESLA-type

    • Abstract: Publication date:  Jan 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  1  Azaryan, N.S.   Batouritski, M.A.   Budagov, Yu.A.   Demyanov, S.E.   Karpovich, V.V.   Liubetski, N.V.   Maximov, S.I.   Rodionova, V.N.   and Shirkov, G.D.   Presented the ideas and techniques underlying the measuring workbench created within the framework of a Dubna-Minsk research project to estimate, by measuring of S11, of a high value (about 1011) of Q-factor of a 1.3 GHz superconducting radio-frequency (SRF) niobium cavity of TESLA-type, which is a key element the superconducting accelerating system of the International Linear Collider (ILC) operating at 1.3 GHz and made of thousands of such cavities. In the paper, the results of measurements and Q-factor estimates are also presented and discussed.
      PubDate: Jan 2018
  • Synthesis of Polymeric Composites Reinforced with Unidirectional and
           Bidirectional Bamboo Fibers

    • Abstract: Publication date:  Aug 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  4  Milene Muniz Eloy da Costa   Santino Loruan Silvestre de Melo   and Enio Pontes de Deus   Due to environmental problems and exhaustion related to materials provided from non-renewable sources, the development of recycling technologies using residue as raw material has grown increasingly. Polypropylene (PP), a thermoplastic polymer, despite be easily recycled, presents a decrease in their mechanical properties after reprocessing cycles. In order to solve this problem, reinforcements may be added, producing a composite with better properties. The choosing of the dispersed phase aimed to consider, especially, its mechanical properties. Moreover, it was also considered the orientations of the incorporated fibers at the composite mechanical strength. In this scenario, a composite material of polymer matrix from recycled PP reinforced unidirectionally and bidirectionally with bamboo fibers were prepared. The fibers were treated with modifiers in order to increase the adhesion between polymer/fiber. The results showed that the use of reinforcement improves the mechanical properties of the polymer. Also, the superficial treatments were effective, indicating that there was an increase of the compatibility between the materials. It can be also inferred that the orientation of the fibers has directly influence at the final properties of the composite.
      PubDate: Aug 2018
  • Sintering Behavior and Properties of cBN/TiC/ SWCNTs or NC Ceramics Matrix
           Nanocomposites (CMNC's) by Field Actived Sparck Plasma Sinter

    • Abstract: Publication date:  Aug 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  4  Badis Bendjemil   Mohamed Mouyane   Jacques G. Noudem   Jérôme Bernard   Jean Michel Reboul   Yannick Guel   and David Houivet   Cubic boron nitrid (cBN) bonded TiC and alloyed with single walled carbon nanotubes (SWCNTs or NC) ceramics matrix nanocomposites (CMNC's) tools were fabricated by a field active sparck plasma sintering process (FASPS). The effects of cBN-TiC ratio, carbon nanotubes and optimization of the sintering process on the microstructure, densification in addition mechanical and vibronic properties of NC-cBN-TiC nanocomposites were studied. The results showed that the nanocomposite cBN-TiC vol. ratio of 8:2 with 0.1 wt% NC. It was found that microhardness increases significantly with addition of NC exhibited the highest microhardness and fracture toughness. After sinters of the samples at 1800℃, 10 mn, 75 MPa of cBN–TiC1-x with x=0.8 with and without addition of 0.1 wt% NC were characterized using field emission scanning electron microscopy (FESEM) and X-ray diffraction. The samples exhibited a dense polycrystalline structure, from the resonant Raman scattering we can locate the vibration frequency of the transformation cBN to hexagonal boron nitrid (hBN) and formation of secondary hard phase TiB2 to consoled the (CMNC's) tools. The final product is hBN-TiC-TiB2-NC.The best product contained cBNx-TiC1-x (x=0.8)-0.1 wt% NC which was sintered at 1800℃, 75 MPa for 10 mn. The Vickers hardness of cBN-TiC1-x (x=0.8) increases with NC incorporation in the matrix The indentation fracture toughness was calculated to be 12.30 MPa m1/2 for cBNx-TiC1-x (x=0.8)-0.1 wt% NC ceramics matrix nanocomposite (CMNC's) tools with excellent wear resistant will be confirmed. The wear of cBN-TiC of the composites tools have shown that this is predominantly a chemical process involving the interaction of the tool with its environment and is restricted by the formation of protective layers on the exposed faces of the tool by the addition of NC. The wear features of tools used in fine cutting tests under identical conditions will be compared and the results will be interpreted in terms of the existing models for the wear of cBN-based nanomaterials by the effects of the additives in the modified tools.
      PubDate: Aug 2018
  • Effect of Two Cleansing Agents on Water Sorption and Solubility of Two
           Thermoplastic Denture Base Materials

    • Abstract: Publication date:  Aug 2018
      Source:Universal Journal of Materials Science  Volume  6  Number  4  Mahmoud Nabil Helaly   Ahmed Mohamed Alam-Eldein   and Ali Mohamed El-Sheikh   Aim: Some patients experience adverse reactions to poly (methyl methacrylate)-based (PMMA) dentures. Polyamide (PA) as an alternative to PMMA has, however, not been well documented regarding water sorption and water solubility. The aim of this in vitro study was to evaluate the effect of two different cleansing agents on water sorption and solubility of two different thermoplastic denture base materials. Materials and methods: A total of 60 samples were fabricated from two different thermoplastic denture base materials (i.e. vertex thermosens and breflex). The samples were divided into 3 groups. Each group was including 20 samples, 10 samples from each denture base material. Samples of Group I were subjected to the distilled water as a control group. While samples of Group II were subjected to the Corega as a cleansing agent and samples of Group III were subjected to Fitty dent as the other cleansing agent. Effect of the two cleansing agents on the two-different thermoplastic denture base materials were evaluated and compared with regards water sorption and solubility. Results: Non-significant results were found regarding water sorption and solubility. The fittydent cleansing agent had a slight more non-significant effect on color stability of vertex thermosens and breflex denture base materials than corega cleansing agent and water. The corega and fittydent cleansing agents had a nonsignificant effect on water sorption and solubility of vertex thermosens and breflex denture base materials. Conclusion: Corega and fittydent cleansing agents could be used safely for disinfecting denture base materials (vertex thermosens and breflex) as they had non-significant effect on color stability, water sorbtion and solubility.
      PubDate: Aug 2018
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Heriot-Watt University
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