Effect of CaO on the Formation of PSZ and γ-Zirconia Nanoparticles through Ball Milling

Publish Year: 1394
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:

JR_ACERPT-1-2_008

تاریخ نمایه سازی: 11 اردیبهشت 1400

Abstract:

The effect of CaO on the formation of β- and γ-zirconia nanoparticles from α-zirconia was investigated and their stability evaluated via mechanical activation. α-ZrO۲+۸.۵wt%CaO powder was milled for ۲-۱۵۰ hours with ball-to-powder weight ratios (BPWR) of ۴۰:۱ and ۶۰:۱. 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, γ-zirconia (with a cubic structure) was obtained by ball milling of α-ZrO۲+۸.۵wt%CaO at room temperature. It was found that α to γ phase transformation began after two hours of milling and completed after ۴۸ hours with a BPWR of ۴۰:۱. Moreover, the Williamson-Hall equation indicated that the particle size of α-ZrO۲+۸.۵wt%CaO was reduced to ۵۰ nanometers and reached its equilibrium point after ۲۴ hours of milling and was unchanged after that. In addition, DSC analysis showed that β-zirconia and γ-zirconia were unstable in pure ZrO۲ powder, while CaO addition led to the stabilization of ZrO۲ as β-zirconia and γ-zirconia after ball milling.

Keywords:

Ball milling , Zirconia nanoparticles , Phase transformation phase stability , DSC analysis

Authors

Mohsen Golzar Shahri

Department of Materials Engineering, Isfahan University of Technology

A. Shafyei

Department of Materials Engineering, Isfahan University of Technology

A. Saidi

Materials Engineering, Isfahan University of Technology

K. Abtahi

Department of Materials Engineering, Isfahan University of Technology