The effect of calcia content on phase composition and mechanical properties of Ca-TZP prepared by high-energy milling of baddeleyite

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• 作者：Andrey O. Zhigachev ; ^{Andreyzhig2009@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Alexey V. Umrikhin ; Yuriy I. Golovin
• 关键词：C. Mechanical properties ; TZP ; High-energy milling ; Calcia
• 刊名：Ceramics International
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：41
• 期：10
• 页码：13804-13809
• 全文大小：827 K

文摘

The effect of calcia content in the 0–13 mol% range on the phase composition, the Vickers hardness and the fracture toughness of near fully dense calcia-stabilized tetragonal zirconia polycrystals prepared by high-energy ball milling of baddeleyite was studied.

Calcia-stabilized zirconia powders with a mean crystallite size of 5–20 nm and different calcia contents were prepared by colloidal high-energy ball milling of naturally occurring zirconia (baddeleyite) in water. Pellet-shaped green bodies were prepared by uniaxial pressing of the milled powders. Ceramics with high tetragonal zirconia content of nearly full density were produced by sintering. Calcia content corresponding to high fraction of tetragonal phase was found to be within the 4–10 mol% range. The Vickers hardness of bulk ceramics increased from 7.55 GPa to 13.3 GPa with increasing calcia content in the 0–13 mol% range. The fracture toughness was shown to have maximum value of 13.3 MPa m^0.5 at 6.6 mol% calcia concentration.