Căutare Fascicula IX după Subiect "microhardness"

Afișează articolele 1-13 of 13

    • Characterization of Sintered Hardmetals Coated with Tic 

      Constantinescu, Stela; Orac, Lucica (Universitatea "Dunărea de Jos" din Galaţi, 2013)
      This paper presents the realization of TiC thin films by CVD method. The thin layers of TiC thicknesses were 8 and 10μm, their thickness increasing with time, keeping the temperature. Diffractometer analysis certifies ...

    • Characterization of Thick Hard Layers with ni-Cr-B-Fe-Al Alloy Obtained by Laser Cladding 

      Drugescu, Elena; Boiciuc, Simona; Gheorghieș, Constantin (Universitatea "Dunărea de Jos" din Galați, 2009)
      To increase the resistance to wear and corrosion of the surface layers made from steel with 0.45% C, multilayer deposition was tested by injection of powder with chemical composition of 8.9% Cr, 4.5% Fe, 5.1% B, 2, 4% ...

    • EDX Analysis of Laser Cladding Layers with Ni-Cr-B-Fe-Al Alloy 

      Boiciuc, Simona; Drugescu, Elena; Miculescu, Florin; Cantaragiu, Alina (Universitatea "Dunărea de Jos" din Galați, 2009)
      Multilayer cladding by injection of powder with 8.9% Cr, 4.5% Fe, 5.1% B, 2.4% Al, 0.6% Cu, Ni rest as chemical composition, in melted bath by a continuous wave CO2laser connected to x-y-z coordinate table was tested in ...

    • Laser Cladding of Ni-Cr-B-Fe_Al Alloy on a Steel Support 

      Levcovici, Sanda Maria; Levcovici, Dan Teodor; Gheorghieș, Constantin; Boiciuc, Simona (Universitatea "Dunărea de Jos" din Galați, 2005)
      Multilayer coating by injection of powder with 8.9% Cr, 4.5% Fe, 5.1% B, 2.4% Al, 0.6% Cu; all reminded of Ni, as chemical composition, in melted bath by CO2 continuous wave laser connected to x-y-z coordinate table was ...

    • Laser Deposition of Bronze Aluminum on Steel Support 

      Boiciuc, Simona (Universitatea "Dunărea de Jos" din Galați, 2015)
      In order to rise the wear and corrosion resistance of 0.45% C superficial steel layers, a multilayer coating was tested by injection of powder with 88.3% Cu; 9.5% Al; 2.2% Fe in melted bath by CO2 continuous wave laser. ...

    • Laser Surface Hardening of 51Crv4 Steel 

      Levcovici, Sanda Maria; Levcovici, Dan Teodor (Universitatea "Dunărea de Jos" din Galați, 2005)
      The work presents the surface changes in microstructure and properties by quenching the 51CrV4 steel from liquid and solid phase, using a CO2 continue laser wave with 900W power. In order to determine the hardening ...

    • Research on the Influence of the Complementary Phase Percentange on the Properties of Copper-Based Composites 

      Boiciuc, Simona; Alexandru, Petrică (Universitatea "Dunărea de Jos" din Galaţi, 2014)
      The article presents the method to obtain copper matrix composite with Cu- Al-Fe alloy particles as complementary phase. The samples were obtained by powder metallurgy methods using different percentages of complementary ...

    • Resesrches on the Production of Copper-Based Composites by Powder Metallurgy Methods 

      Boiciuc, Simona; Alexandru, Petrică (Universitatea "Dunărea de Jos" din Galați, 2014)
      The article presents how to obtain copper matrix composite with alloy particles of NiCrBFeAl as complementary phase. The samples were obtained by powder metallurgy methods using different percentages of the additional ...

    • Structural Characteristics in Cobalt Based Alloys 

      Ghiban, Brânduşa; Borţun, Cristina; Ciucă, Sorin (Universitatea "Dunărea de Jos" din Galaţi, 2008)
      In the present paper there are presented results of investigations on samples of partially removable denture made of cobalt base alloys (Co-Cr-Mo) regarding specific structural analysis: determination of structural phases ...

    • Structuras of the Eutectoid Zn-Al Alloy Obtained by Directed Solidification 

      Agapie, Mirela; Varga, Béla (Universitatea "Dunărea de Jos" din Galați, 2014)
      This work analyses the structure of the eutectoid Zn-Al based alloy directionally solidified, with cooling rates ranging between 8.5-0.4 oC/sec. During cooling, the temperature gradient in the liquidus zone, respectively ...

    • Studies and Research Obtaining Bronze Filters Using Powder Metallurgy Methods 

      Boiciuc, Simona; Alexandru, Petrică (Universitatea "Dunărea de Jos" din Galați, 2015)
      The article presents how to obtain porous bronze products using copper - based powder by powder metallurgy methods. The formation of tablets was done by free pouring the spherical powder into the mould, followed by their ...

    • Studies and Researches Regarding the Obtaining and Characterization of Composite Nickel Coatings-Ni/Al2O3, Ni/Kaolin Electrochemically Produced 

      Boiciuc, Simona; Alexandru, Petrică (Universitatea "Dunărea de Jos" din Galați, 2016)
      This study presents the composite nickel coatings electrochemically obtained using as disperse phases Al2O3 particles and kaolin. There were used Watts electrolytes, with a pH = 4, current density of 4 A/dm2, a concentration ...

    • The Protective Behaviour Titanium Nitride Coatings 

      Constantinescu, Stela (Universitatea "Dunărea de Jos" din Galați, 2015)
      The experiments conducted to obtain a thin layer of nitride through the vapour chemical deposition method have followed an original path to obtain TiN directly in the working room thus avoiding the import of these ...