Advances in Materials

Volume 3, Issue 5, October 2014

  • Composite Ceramics Based on Nanostructured Refractory Oxide Whiskers

    Tatyana Mikhailovna Ulyanova, Petr Alexandrovich Vitiaz, Nikolai Pavlovich Krutko, Luydmila Vasil’evna Ovseenko, Alexandr Arkad’evich Shevchenok, Luydmila Viktorovna Titova, Alexis Romanovich Luchenok

    Issue: Volume 3, Issue 5, October 2014
    Pages: 33-37
    Received: Jun. 14, 2014
    Accepted: Jul. 03, 2014
    Published: Oct. 10, 2014
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    Abstract: In the present work the influences of thermal-baric effect in the process of nanostructured alumina and zirconia powders consolidation on structure and physical-mechanical properties of the composite ceramics have been investigated. The samples of ceramics have been prepared from nanostructured powders (ZrO2 -3 mol. % Y2O3) and Al2O3 in ratio from ... Show More
  • Surface Passivation Effect on CO2 Sensitivity of Spray Pyrolysis Deposited Pd-F: SnO2 Thin Film Gas Sensor

    Patrick Mwinzi Mwathe, Robinson Musembi, Mathew Munji, Benjamin Odari, Lawrence Munguti, Alex Alfred Ntilakigwa, Julius Mwabora, Walter Njoroge, Bernard Aduda, Boniface Muthoka

    Issue: Volume 3, Issue 5, October 2014
    Pages: 38-44
    Received: Sep. 12, 2014
    Accepted: Sep. 27, 2014
    Published: Oct. 10, 2014
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    Abstract: Different thin films samples made of SnO2, F:SnO2, Pd: SnO2 and and co-doped Pd-F: SnO2 were deposited at a substrate temperature of 450oC using optimized doping concentrations of F and Pd, thereafter the samples were annealed and passivated in a tube furnace at 450oC. Optical and electrical methods were used in characterizing the thin film samples... Show More
  • Experimental Investigation on the Effect of Multiwalled Carbon Nanotubes and Nano-SiO2 Addition on Mechanical Properties of Hardened Cement Paste

    Anand Hunashyal, Nagaraj Banapurmath, Akshay Jain, Sayed Quadri, Ashok Shettar

    Issue: Volume 3, Issue 5, October 2014
    Pages: 45-51
    Received: Sep. 05, 2014
    Accepted: Sep. 16, 2014
    Published: Oct. 30, 2014
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    Abstract: This paper investigates the behaviour of hardened cement paste reinforced with multi-walled carbon nano-tubes (MWCNTs) and Nano-SiO2 (NS). In these composites, the percentage of MWCNTs was fixed at 0.75% by weight of cement, while the percentage of NS was fixed at 0.5% by weight of cement. Dispersion of both MWCNTs and NS was carried out using ultr... Show More
  • Synthesis and Characterization of Cobalt Oxide and Composite Thin Films

    Ulrika Lagerqvist, Mikael Ottosson, Annika Pohl

    Issue: Volume 3, Issue 5, October 2014
    Pages: 52-57
    Received: Feb. 18, 2014
    Accepted: Oct. 13, 2014
    Published: Nov. 10, 2014
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    Abstract: Cobalt oxide and composite thin films were synthesized by spin-coating technique, followed by heating to 500°C in oxidizing, inert, or reducing atmospheres. Methanolic solutions of triethanolamine complexes of cobalt acetates and nitrates were spin-coated at 1000, 2000, and 3000 rpm. The influence of heating parameters and film thickness on the pha... Show More
  • Improvement of the Properties of Aluminium Alloys

    Korostelev V. F., Bolshakov A. E.

    Issue: Volume 3, Issue 5, October 2014
    Pages: 58-62
    Received: Aug. 22, 2014
    Accepted: Nov. 24, 2014
    Published: Nov. 27, 2014
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    Abstract: The article describes the improvement of the properties of aluminium alloys under pressure application of up to 400 MPa to a liquid or crystallizing metal. A cybernetic model has been developed. Three phases of the alloy compressibility under pressure were investigated. The results of microstructure studies are indicated, the focus has been made on... Show More