M.S. El-Eskandarany, A. Al-Hazza, L. Al-Hajji, A. Alduweesh, S. Ahmed, A. Al-Rowayeh
Kuwait Institute for Scientific Research, KISR, Kuwait
pp. 388 - 391
Keywords: nanotechnology, powder technology, mechanical ball milling, fracture toughness, nanoindentations
A high-energy ball milling technique was employed to prepare ultrafine cemented carbide nanocomposite powders with compositions (wt.%) of 93WC/7-xCo/xZrO2-2mol% Y2O3 powders (x=0, 1, 2, 3, 4, 5, 6, 7 wt%). The nanocomposite powders obtained after 75 h of ball milling possessed excellent morphological characteristics with spherical morphology and an average particle size of 150 nm in diameter. The powder of the end-productswere then consolidated in vacuum under a uniaxial pressure of 30 MPa at 1250 °C using spark plasma sintering. The fully dense nanocomposite bulk samples obtained via the SPS process maintain their nanocrystalline structure.The indentation fracture toughness (Kc1) of the bulk consolidated were investigated as a function of ZrO2 content.