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International Journal of Material Science
   [6 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2226-4531 - ISSN (Online) 2226-4523
     Published by Science and Engineering Publishing Company Homepage  [47 journals]
  • Severe Plastic Deformation (SPD); Nanostructured Materials; High Strength;
           Applications

    • Abstract: Severe Plastic Deformation (SPD); Nanostructured Materials; High Strength; Applications
      Pages 120-123
      Author Kwang-Rae Le
      The characteristics of Ethoxylated-BisGMA (E-GMA) composite were investigated to find out its possibility as an alternative to Bis-GMA. Even though Bis-GMA has been most commonly used as a major matrix for the restorative composites, Bis-GMA has an inherent problem of huge viscosity. In this study, the properties of E-GMA composite were investigated and compared with those of Bis-GMA composite. The E-GMA composite exhibited much better physical-chemical properties than Bis-GMA/TEGDMA (70wt%/30wt%) composite; for example, deeper depth of cure, higher degree-of-conversion (DC), lower polymerization shrinkage, and lower water sorption. From these experimental results, it might be suggested that E-GMA could be used as a promising alternative to the most widely used material of Bis-GMA.
      PubDate: 2014-12
       
  • Synthesis of Tic Thin Films by CVD from Toluene and Titanium Tetrachloride
           with Nickel as Catalyst

    • Abstract: Synthesis of Tic Thin Films by CVD from Toluene and Titanium Tetrachloride with Nickel as Catalyst
      Pages 124-129
      Author S. López-RomeroJ. Chávez-Ramíre
      Titanium Carbide TiCx was deposited onto quartz substrates by the chemical vapour deposition (CVD) method. TiCx thin films were obtained from titanium tetrachloride (TiCl4) and toluene (C6H5CH3) as carbon source. Deposits were carried out in the range of substrate temperatures from 300 to 1100 C, with a source gas molar ratio (C6H5CH3/TiCl4 + C6H5CH3 ) of 0.8. There was two deposit processes; the first was to carry out without nickel as catalyst and the second with nickel as catalyst. Results showed that the effect of nickel as catalyst is very relevant to obtain TiCx. TiC0.87 thin films, 0.5 m thickness, were obtained for deposition temperatures above 900C using nickel as catalyst. In this case a cubic structure, with a lattice parameter of 4.327 Å and a hardness of 2900 Vickers, was obtained at 11000C. whilst for substrate temperatures between 300 to 900°C with nickel as catalyst amorphous carbon samples were obtained. For the samples prepared without the presence of the nickel as catalyst only C amorphous thin films were obtained for all deposit temperatures.
      PubDate: 2014-12
       
 
 
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