Effects of La2O3 Addition on the Microstructure and Properties of Activated Sintered W-Ni Compacts

BALCI O., DEMIRKAN O. U., Ağaoğulları D., GOKCE H., GENC A., Öveçoğlu M. L., ...More

18th International Conference on Solid Compounds of Transition elements (SCTE 2012), Lisbon, Portugal, 31 March - 05 April 2012, vol.194, pp.217-221 identifier identifier

  • Publication Type: Conference Paper / Full Text
  • Volume: 194
  • Doi Number: 10.4028/www.scientific.net/ssp.194.217
  • City: Lisbon
  • Country: Portugal
  • Page Numbers: pp.217-221
  • Istanbul Technical University Affiliated: Yes


In order to improve the properties of Ni activated sintered W compacts, La2O3 was added to a W-1 wt.% Ni matrix alloy. W-1 wt.% Ni-0.5 wt.% La2O3 and W-1 wt.% Ni-1 wt.% La2O3 composites were fabricated by mechanical alloying and activated sintering methods. The effects of La2O3 content and mechanical alloying duration on the microstructural and physical properties of activated sintered W-Ni compacts were investigated. The results showed that La2O3 particles have a significant effect on the density/microhardness values and wear amounts of the samples. The relative density value of 96.39 % and microhardness value of 4.08 +/- 0.28 GPa of W-1 wt.% Ni samples increased to respectively 98.09 % and 5.45 +/- 0.29 GPa with the addition of 1 wt.% La2O3. Wear rate of 3.26 +/- 0.81 (mm(3)N(-1)m(-1))x10(-9) of the W-1 wt% Ni samples decreased to 2.10 +/- 0.24 (mm(3)N(-1)m(-1))x10(-9) with the addition of 0.5 wt.% La2O3. Furthermore, grain sizes decreased and microhardness values increased with increasing mechanical alloying duration.