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

Abstract

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.