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Title

EFFECT OF CAO ON THE FORMATION OF PSZ AND γ-ZIRCONIA NANOPARTICLES THROUGH BALL MILLING

Pages

 Start Page 40 | End Page 44

Abstract

 The effect of CaO on the formation of β- and g-zirconia nanoparticles from a-zirconia was investigated and their stability evaluated via mechanical activation. a-ZrO2+8.5wt%CaO powder was milled for 2-150 hours with ball-to-powder weight ratios (BPWR) of 40: 1 and 60: 1. Structural evaluations were conducted using X-Ray diffraction and scanning electron microscope (SEM). Thermal analysis was carried out using Differential Scanning Calorimetry (DSC). Results showed that, g-zirconia (with a cubic structure) was obtained by BALL MILLING of a-ZrO2+8.5wt%CaO at room temperature. It was found that α to γ phase transformation began after two hours of milling and completed after 48 hours with a BPWR of 40: 1. Moreover, the Williamson-Hall equation indicated that the particle size of a-ZrO2+8.5wt%CaO was reduced to 50 nanometers and reached its equilibrium point after 24 hours of milling and was unchanged after that. In addition, DSC ANALYSIS showed that b-zirconia and g-zirconia were unstable in pure ZrO2 powder, while CaO addition led to the stabilization of ZrO2 as b -zirconia and g-zirconia after BALL MILLING.

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