Abstract

The influence of SiO₂ impurity (with a concentration varying from 0 to 10 mol %) on the stability of tetragonal ZrO₂ (t-ZrO₂) and on a set of micro- and macromechanical properties of calcia-stabilized (C_CaO = 6.5 mol %) alumina-toughened (\({{C}_{{{\text{A}}{{{\text{l}}}_{2}}{{{\text{O}}}_{3}}}}}\) = 5.8 mol %) zirconia-based ceramics (ATZ ceramics) has been studied. It has been found that the introduction of SiO₂ (\({{C}_{{{\text{Si}}{{{\text{O}}}_{2}}}}}\) = 5 mol %) raises fracture toughness K_c by nearly twofold (from 7.05 to 12.43 MPa m^1/2), slightly decreases hardness H (from 12.75 to 10.9 GPa), and improves ultimate compression strength σ_S (from 2.44 to 2.73 GPa) and ductility (compression strain ε grows from 5.3 to 7.3%) of ATZ ceramics. It has been shown that the above improvements were achieved by means of a reduction in t-ZrO₂ stability.

中文翻译：

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二氧化硅对氧化铝增韧氧化锆基陶瓷相组成稳定性和力学性能的影响

摘要

SiO ₂杂质（浓度在0到10 mol％之间）对四方ZrO ₂（t -ZrO ₂）的稳定性以及氧化钙稳定的一系列微观和宏观力学性能的影响（C _CaO = 6.5 mol％）氧化铝增韧（\（{{C} _ {{{\ text {A}} {{{\ text {l}}} _ {2}} {{{\ text {O}}} __ { 3}}}}} \） = 5.8 mol％）已经研究了氧化锆基陶瓷（ATZ陶瓷）。已经发现SiO ₂的引入（\（{{C} _ {{{\ text {Si}} {{{\ text {O}}} _ {2}}}}}} \） = 5 mol ％）将断裂韧性K _c提高了近两倍（从7.05到12.43 MPa m ^1/2），稍微降低硬度ħ（从12.75到10.9 GPa）的，并可以提高σ极限压缩强度_小号ATZ陶瓷的（从2.44到2.73 GPa）的和延展性（压缩应变ε生长从5.3至7.3％）。已经表明，通过降低t -ZrO ₂稳定性实现了上述改进。